Site Report: Pineapple's Texaco Station

Site Name:	Pineapple's Texaco Station
Address:	5138 Old Seward Highway, Anchorage, AK 99503
File Number:	2100.38.503
Hazard ID:	4692
Status:	Active
Staff:	Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude:	61.173957
Longitude:	-149.868729
Horizontal Datum:	WGS84

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Operated as Pineapple Texaco Service Station from 1969 to 1985 when the building and underground storage tank system (UST) were removed. The facility included four 4,000 gallon gasoline tanks, one 10,000 gallon diesel tank, one used oil tank, two dispenser islands, and two service bays in the building. It does not appear that any samples were collected during the UST removal. During a Phase II assessment conducted in November 2007, seven monitoring wells were installed on the property and contamination was found in vicinity of the former service station building. The 2007 soil samples had up to 163 mg/kg GRO and 0.07 mg/kg benzene. In 2009 to help define the extent of the remaining contamination six soil borings were sampled and two of them were completed as monitoring wells (MW8 and MW9). The soil samples collected in 2009 had up to 455 mg/kg DRO, 4,290 mg/kg GRO, 0.422 mg/kg benzene, and 17.6 mg/kg lead, with the highest concentrations being encountered at the soil/water interface at 5.5 to 6.5 feet below ground surface. Concentrations of GRO were over maximum allowable (1,400 mg/kg) in both monitoring wells (MW8 and MW9). In 2013 soil samples were collected from four soil borings had up to 260 mg/kg DRO, 1,600 mg/kg GRO, and 0.93 mg/kg benzene. Concentrations of GRO were over maximum allowable (1,400 mg/kg) at one boring location (SB13-1). In 2017 one additional monitoring well was installed to the south across International Airport Way. Additional soil borings have been proposed for the 2020 field season to assess whether areas with previous exceedance of maximum allowable or human health cleanup levels still exceed current cleanup levels. Semi-annual groundwater monitoring continues at this site.

Action Information

Action Date	Action	Description	DEC Staff
8/12/2008	Spill Transferred from Prevention Preparedness and Response Program	Site transferred by PERP staff Frank Wesser. Spill Number = 07239932401; Spill Date 11/20/07; Substance = Gasoline; Quantity Unknown.	Mitzi Read
8/15/2008	Site Added to Database	Site added to the database.	Mitzi Read
8/18/2008	Exposure Tracking Model Ranking	Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.	Grant Lidren
2/9/2009	Update or Other Action	The RP for this site is Chevron. Contact: Greg Barton, Chevron Environmental Management Company, 611 Bollinger Canyon Road, Room 3620, San Ramon, CA 94583. The consultant for Chevron on this site is ARCADIS US Inc.	Robert Weimer
2/25/2009	Meeting or Teleconference Held	Meeting with Chevron and their consultants. ADEC will send a letter requesting a release investigation workplan to define the extent of the soil and groundwater contamination at this site, and to install monitoring wells and monitor the groundwater on a quarterly basis for BTEX, GRO, DRO, and lead. The release investigation is to be followed by the submittal of a corrective action plan to address the remaining soil and groundwater contamination at this site.	Robert Weimer
4/24/2009	Potentially Responsible Party/State Interest Letter	Potential responsible party letter send to Chevron.	Robert Weimer
4/24/2009	Update or Other Action	ADEC letter sent to Chevron requesting that the seven monitoring wells be sampled on a quarterly basis for BTEX, GRO, DRO, and lead along with groundwater elevations, with the results of the next groundwater monitoring event submitted by June 1, 2009. ADEC also requests that you conduct a release investigation to define the extent of the soil and groundwater contamination at this site. ADEC requests that you submit a release investigation workplan by June 1, 2009. ADEC also requests that you conduct an indoor air evaluation for this site and submit the results by December 1, 2009. ADEC requests that you submit a corrective action plan by December 1, 2009 to address the remaining soil and groundwater contamination identified the by the existing sampling and requested release investigation sampling at this site.	Robert Weimer
5/19/2009	Update or Other Action	ADEC approves request for an extension to July 15, 2009 to submit the groundwater monitoring report and workplan for conducting a release investigation to define the extent of the soil and groundwater contamination. The groundwater monitoring is to be conducted at the end of May.	Robert Weimer
6/12/2009	Offsite Soil or Groundwater Disposal Approved	Review and approve treatment of 1 drum of purge water.	Robert Weimer
6/23/2009	Site Visit	At the request of Robert Weimer, the project manager, a quality assurance site inspection was conducted on 5/27/09. Upon arival, the consultant was currently sampling two wells, MW-6 and MW-7, simultaneously with two seperate sampling systems. The only observed deviation was the use of sampling equipment and measurements with a car idling nearby. However, after discussion with the sampling crew it was determined that the impact to the sample results would be minimal. A copy of the site inspection report will be placed in the site file and in the QA file.	Brenton Porter
7/21/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves plan to thermally treat 5 drums of BTEX/GRO/DRO/RRO contaminated drill cuttings from the 2007 site assessment work.	Robert Weimer
7/27/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves plan to treat 15 gallons of contaminated purge water from the 2007 site assessment work.	Robert Weimer
9/1/2009	Document, Report, or Work plan Review - other	May 26-27, 2009 groundwater monitoring event. Up to 11 mg/l DRO, 0.88 mg/l GRO, 41 ug/l benzene, and 22 ug/l lead in the 7 monitoring wells sampled. Contamination concentrations appear to be increasing. Depth to groundwater was 4.24 to 5.98 feet below ground surface. Groundwater flow direction was toward the south.	Robert Weimer
9/9/2009	Document, Report, or Work plan Review - other	Review and approve request to transport to and store soil cutting and purge water generated during the upcoming September 2009 site work at a secure location at 1441 C street.	Robert Weimer
9/15/2009	Document, Report, or Work plan Review - other	Reviewed July 8, 2009 workplan for release investigation. The workplan proposes to sample 4 soil borings to help define the extent of the soil contamination identified at monitoring well MW-4 and MW-5. The soil samples are to be analyzed for DRO/GRO/BTEX/Lead. Need soil samples collected at soil/water interface (around 6 feet below ground surface). No air-knife allowed due to shallow borings and volatile samples. Need additional borings completed as monitoring wells south of monitoring wells MW-6 and MW-7. These additional monitoring wells are to be sampled for BTEX, GRO, DRO, and lead on a quarterly basis.	Robert Weimer
9/21/2009	Site Visit	Discuss site with RP's consultant, site visit to discuss site work and monitoring well placement. One monitoring well is to be installed to the south of monitoring well MW-6. One more monitoring well is to be installed to the south of monitoring well MW-7.	Robert Weimer
9/22/2009	Document, Report, or Work plan Review - other	On September 21-21, 2009 six soil borings were sampled and two were completed as monitoring wells to help define the extent of the soil and groundwater contamination at the site. Up to 455 mg/kg DRO, 4,290 mg/kg GRO, 0.422 mg/kg benzene, and 17.6 mg/kg lead was found in the soils sampled. The highest contaminant concentrations are near the soil/water interface at 5.5 to 6.5 feet below ground surface.	Robert Weimer
9/23/2009	Document, Report, or Work plan Review - other	ADEC approves request to transport 2 super sacks of contaminated drill cuttings generated during the September release investigation work to the 15th & C secure area for storage.	Robert Weimer
11/23/2009	Update or Other Action	Approved request for extension to March 31, 2010 for submitting a corrective action plan for this site.	Robert Weimer
11/24/2009	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for thermal treatment of 2 super sacks of contaminated drill cuttings generated during the September release investigation work.	Robert Weimer
1/6/2010	Offsite Soil or Groundwater Disposal Approved	Review and approve treatment of 1 drum of purge water.	Robert Weimer
2/17/2010	Document, Report, or Work plan Review - other	September 24, 2009 groundwater monitoring event. Up to 4.4 mg/l DRO, 31 mg/l GRO, 66 ug/l benzene, and 1,000 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations appear to be increasing. Depth to groundwater was 5.09 to 6.88 feet below ground surface. Groundwater flow direction was toward the south.	Robert Weimer
3/1/2010	Document, Report, or Work plan Review - other	November 9, 2009 groundwater monitoring event. Up to 5.1 mg/l DRO, 30 mg/l GRO, 110 ug/l benzene, and 1,000 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 3 of the 9 monitoring wells sampled. Depth to groundwater was 5.60 to 6.78 feet below ground surface. Groundwater flow direction was toward the south. Sheen and fuel odor we noted in monitoring well MW-9 which had 30 mg/l GRO and 57 ug/l benzene.	Robert Weimer
3/4/2010	Document, Report, or Work plan Review - other	ADEC approves request to transport drums of monitoring well purge water to 1441 C Street for secure storage.	Robert Weimer
3/16/2010	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 3/10/10. MW8 & MW9 are to be sampled for PAH the next monitoring event. Chevron will submit the results of the release investigation work conducted on 9/21/09. Chevron is to conduct a preferential pathway assessment for International Airport Road for the shallow groundwater contamination (depth to water 5.84 ft below ground surface in nearby monitoring well MW9). We discussed that the contamiantion is shallow and can be accessed by excavation. We discussed that groundwater samples for volatiles should not be collected with bailers or peristaltic pumps due to the loss of volatiles, Chevron is to provide a workplan specifying how groundwater samples will be collected in the future.	Robert Weimer
4/8/2010	Offsite Soil or Groundwater Disposal Approved	Review and approve treatment of 1 drum of purge water.	Robert Weimer
4/9/2010	Document, Report, or Work plan Review - other	DEC review of Site Vapor Intrusion Evaluation report for this site. The report concluded that this site does not have a potential for vapor intrusion based on structures currently being more than 30 feet away from the remaining soil and groundwater contamination at this site. The vapor intrustion evaluation may need to be updated based on future structures that could be constructed at or near the site.	Robert Weimer
5/20/2010	Update or Other Action	Approved, until further notice, no-purge groundwater sampling at this site.	Robert Weimer
8/23/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
8/27/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
11/3/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
2/2/2011	Document, Report, or Work plan Review - other	March 3, 2010 groundwater monitoring event. Up to 2.3 mg/l DRO, 1.1 mg/l GRO, 9.4 ug/l benzene, and 239 ug/l lead in the 6 monitoring wells sampled (3 other monitoring wells were not sampled due to snow cover, this included the two most contaminated wells MW-8 and MW-9). Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Depth to groundwater was 6.72 to 7.87 feet below ground surface. Groundwater flow direction was toward the southwest. The consultant recommends continued quarterly groundwater monitoring.	Robert Weimer
2/3/2011	Document, Report, or Work plan Review - other	May 7, 2010 groundwater monitoring event. Up to 22 mg/l DRO, 38 mg/l GRO, 91 ug/l benzene, and 84 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 3 of the 9 monitoring wells sampled. Depth to groundwater was 4.15 to 6.24 feet below ground surface. Groundwater flow direction was toward the southeast. The consultant recommends continued quarterly groundwater monitoring.	Robert Weimer
2/3/2011	Document, Report, or Work plan Review - other	July 7, 2010 groundwater monitoring event. Up to 7.3 mg/l DRO, 27 mg/l GRO, 81 ug/l benzene, and 52.6 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 7 of the 9 monitoring wells sampled. Depth to groundwater was 4.83 to 6.48 feet below ground surface. Groundwater flow direction was toward the southeast. The consultant recommends semi-annual monitoring in MW1, MW-3, MW-4,and MW-5, and quarterly groundwater monitoring in the rest of the monitoring wells.	Robert Weimer
2/4/2011	Document, Report, or Work plan Review - other	October 4, 2010 groundwater monitoring event. Up to 2.7 mg/l DRO, 39 mg/l GRO, 120 ug/l benzene, and 72.4 ug/l lead in the 8 monitoring wells sampled. Contamination concentrations increased in 6 of the 8 monitoring wells sampled. Depth to groundwater was 5.13 to 6.38 feet below ground surface. Groundwater flow direction was toward the southeast. The consultant recommends semi-annual monitoring in MW1, MW-3, MW-4,and MW-5, and quarterly groundwater monitoring in the rest of the monitoring wells. Most samples recieved at lab over temperature, some results may be biased low.	Robert Weimer
2/4/2011	Update or Other Action	DEC approves request for semi-annual monitoring in MW1, MW-3, MW-4,and MW-5, and quarterly groundwater monitoring in the rest of the monitoring wells; and suspending PAH sampling of groundwater at the site.	Robert Weimer
2/4/2011	Document, Report, or Work plan Review - other	On September 2009 six soil borings were sampled and two of them were completed as monitoring wells (MW-8 and MW-9). Up to 455 mg/kg DRO, 4290 mg/kg GRO, 0.422 mg/kg benzene, and 17.6 mg/kg lead in the soil samples collected. The highest GRO and DRO contamination was found at 5.5 to 6.5 feet below ground surface. The highest benzene contamination was found at 15 feet below ground surface at MW-8. The extent of the contamination to the south (down gradient) has not been defined. Sheens noted on soils from monitoring well MW-9. The field notes document that some hydraulic fluid spilled from the direct push rig during the installation of monitoring well MW-9.	Robert Weimer
2/15/2011	Document, Report, or Work plan Review - other	DEC review of corrective action plan. The plan evaluated three corrective action methods: Excavation, Soil Vapor Extraction/Air Sparging, and Monitoried Natural Attenuation (MNA). Some MNA data was collected in 2009. The plan recommends continued groundwater monitoring to evlauate MNA effectiveness and to review utilites near the site to assess subsurface preferential pathways.	Robert Weimer
3/2/2011	Document, Report, or Work plan Review - other	ADEC approves temporary storage of any purgewater generated in 2011 at the secure area at 1441 C Street.	Robert Weimer
6/3/2011	Update or Other Action	ADEC approves request for suspending, until further notice, the sampling of MW-1, MW-4, and MW-5 for DRO, GRO, and BTEX.	Robert Weimer
10/25/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
11/3/2011	Document, Report, or Work plan Review - other	ADEC approves temporary storage of any purgewater generated in Fall of 2011 at the secure area at 1441 C Street.	Robert Weimer
11/21/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of purgewater generated in Fall 2011 groundwater monitoring event.	Robert Weimer
12/13/2011	Document, Report, or Work plan Review - other	April 20, 2011 groundwater monitoring event. Up to 5.2 mg/l DRO, 11.0 mg/l GRO, 30 ug/l benzene, and 37.8 ug/l lead in the 8 monitoring wells sampled. Contamination concentrations increased in 5 of the 8 monitoring wells sampled. Depth to groundwater was 3.32 to 5.79 feet below ground surface. Groundwater flow direction was toward the southwest. Volatile samples collected with Hydrasleeve or bladder pump, other samples collected with bailer.	Robert Weimer
1/24/2012	Update or Other Action	ADEC approves request, due to weather conditions, to skip 1st quarter 2012 groundwater monitoring event.	Robert Weimer
2/3/2012	Document, Report, or Work plan Review - other	Preferential pathway study reviewed depth to groundwater in relation to depth of burial of utilities near the contamination indentified at this site. Historic groundwater in the site monitoring wells has been between 3.3 and 6.8 feet below ground surface (bgs). Typical utility burial is 3 to 12 ft bgs. The consultant identified utilities down gradient that may create groundwater preferential pathways for the site.	Robert Weimer
2/3/2012	Document, Report, or Work plan Review - other	June 7, 2011 groundwater monitoring event. Up to 5.5 mg/l DRO, 25 mg/l GRO, 170 ug/l benzene, and 75.1 ug/l lead in the 8 monitoring wells sampled. Contamination concentrations increased in 5 of the 8 monitoring wells sampled. Depth to groundwater was 4.71 to 6.14 feet below ground surface. Groundwater flow direction was toward the south. Volatile samples collected with Hydrasleeve, other samples collected with bailer. Monitoring well MW-3 needs to be repaired.	Robert Weimer
3/1/2012	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/28/12. Chevron is to continue to conduct quarterly groundwater sampling, propose what additional assessment work to evaluate preperential parthways that have been identified, repair monitoring well MW-3, and provide a corrective action plan for the remaining soil and groundwater contamination at the site.	Robert Weimer
8/21/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
11/28/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
12/18/2012	Document, Report, or Work plan Review - other	September 16, 2011 groundwater monitoring event. Up to 3.7 mg/l DRO, 26 mg/l GRO, 100 ug/l benzene, and 351 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 5 of the 9 monitoring wells sampled. Volatile samples collected with Hydrasleeve, other samples collected with bailer.	Robert Weimer
12/19/2012	Document, Report, or Work plan Review - other	October 31, 2011 groundwater monitoring event. Up to 5.5 mg/l DRO, 18 mg/l GRO, 47 ug/l benzene, and 155 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 7 of the 9 monitoring wells sampled. Volatile samples collected with Hydrasleeve, other samples collected with bailer.	Robert Weimer
12/20/2012	Document, Report, or Work plan Review - other	June 20, 2012 groundwater monitoring event. Up to 3.3 mg/l DRO, 23 mg/l GRO, 65 ug/l benzene, and 41.8 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 6 of the 9 monitoring wells sampled. Depth to groundwater was 4.28 to 5.55 feet below ground surface. Groundwater flow direction was toward the south by southeast. Volatile samples collected with Hydrasleeve, other samples collected with bailer. Monitoring well MW-3 needs to be repaired.	Robert Weimer
1/28/2013	Document, Report, or Work plan Review - other	September 19, 2012 groundwater monitoring event. Up to 2.2 mg/l DRO, 8.1 mg/l GRO, 43 ug/l benzene, and 85.8 ug/l lead in the 7 monitoring wells sampled. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Depth to groundwater was 3.40 to 5.03 feet below ground surface. Groundwater flow direction was toward the southeast. Volatile samples collected with Hydrasleeve, other samples collected with bailer. Monitoring well MW-3 needs to be repaired.	Robert Weimer
2/25/2013	Document, Report, or Work plan Review - other	November 7, 2012 groundwater monitoring event. Up to 2.1 mg/l DRO, 10 mg/l GRO, 100 ug/l benzene, and 92.5 ug/l lead in the 6 monitoring wells sampled. Contamination concentrations increased in 5 of the 6 monitoring wells sampled. Depth to groundwater was 3.95 to 5.13 feet below ground surface. Groundwater flow direction was toward the south. Volatile samples collected with Hydrasleeve, other samples collected with bailer. The volatile samples may be biased low because the sample interval was not documented.	Robert Weimer
2/26/2013	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/26/13. Chevron proposes to continue to conduct quarterly groundwater monitoring to monitor for natural attenuation and trends, an updated preferential pathway assessment plan. Based on the results of the preferential pathway assessment the will submit an new corrective action plan for the enhanced or active treatment. The next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data. We discussed that all semi-annual monitoring events need to be at least 120 days apart.	Robert Weimer
3/26/2013	Update or Other Action	DEC conditionally approves the use of a portable activated carbon (gac) filter system for this site to treat water generated during groundwater monitoring. The storage of water at the site or the secure storage area at 1441 C Street is also approved.	Robert Weimer
6/14/2013	Update or Other Action	RPs consultant requested delaying conducting the porposed preferential pathway monitoring wells until after active treatment has occurred, in that case DEC is requesting the corrective action plan (including a schedule for conducting the work) be submitted by August 1, 2013.	Robert Weimer
6/18/2013	Update or Other Action	RPs consultant will either conduct preferential pathway assessment in 2013 and conduct active treatment in 2014 or conduct active treatment in 2013 and collect peferential assessment as part of the active treatment work.	Robert Weimer
6/28/2013	Site Visit	Site visit to observe current site conditions.	Robert Weimer
10/28/2013	Document, Report, or Work plan Review - other	June 8, 2013 groundwater monitoring event. Up to 11.0 mg/l DRO, 15.7 mg/l GRO, 32 ug/l benzene, and 25 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 8 of the 10 monitoring wells sampled. Depth to groundwater was 4.08 to 6.99 feet below ground surface. Groundwater flow direction was toward the southeast. A downgradient monitoring well across the street at the Chevron site (MW-6) had 2.1 mg/l DRO, non-detect (<0.05 mg/l) GRO, non-detect (<0.23 ug/l) benzene, and 25 ug/l lead. Each monitoring well was sampled twice: once with no purge (Hydrasleeve), and then after purging (bladder pump). Results of the Hydrasleeve are biased low because the water column sampled did not include the surface of the groundwater, the top of the water column sampled ranged from 3.0 to 31.8 inches below the surface of the groundwater. Results of the purge samples may also be biased low because the depth of the pump intake was not documented in the field notes. Not possible to compare the no purge and purge results because of problems with the interval sampled.	Robert Weimer
11/8/2013	Update or Other Action	Approved request to transport 1 drum of soil cuttings and 1 drum of decontamination water generated during the 11/6/13 release investigation to the secure storage area at 1441 C Street.	Robert Weimer
2/11/2014	Document, Report, or Work plan Review - other	August 18, 2013 groundwater monitoring event. Up to 2.2 mg/l DRO, 17.7 mg/l GRO, 20 ug/l benzene, and 65 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 9 monitoring wells sampled. Depth to groundwater was 4.43 to 6.61 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) had 2.1 mg/l DRO, non-detect (<0.05 mg/l) GRO, non-detect (<0.24 ug/l) benzene, and 23 ug/l lead. Each monitoring well was sampled twice: once with no purge (Hydrasleeve), and then after purging (bladder pump). Volatile samples were collected with Hyrasleeve at the top 3 feet of the water column, non-volatiles were collected with a bailer.	Robert Weimer
2/20/2014	Update or Other Action	ADEC approves request, due to ice in the monitoring wells during the spring monitoring events, to skip 1st quarter groundwater monitoring events until futher notice.	Robert Weimer
2/21/2014	Document, Report, or Work plan Review - other	On November 6, 2013 four soil borings were sampled. Up to 260 mg/kg DRO, 1,600 mg/kg GRO, 0.931 mg/kg benzene, and 13.4 mg/kg total lead in the soil samples collected. Groundwater was encountered between 5.0 to 7.5 feet below ground surface. CRA plans to submit a work plan to DEC by May 1, 2014 for the active remediation of the site.	Robert Weimer
2/27/2014	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/27/2014. They plan to continue tri-annual groundwater monitoring. Because of problems with last year’s purge/no-purge sampling the next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data or they will switch to no purge for future sampling events. The consultant will make sure that their site reports are complete in accordance with DEC’s 9/23/2009 Site Characterization Work Plan and Reporting Guidance for Investigation of Contaminated Sites. DEC to send a letter requesting active remediation at this site in 2014.	Robert Weimer
9/8/2014	Document, Report, or Work plan Review - other	November 4, 2013 groundwater monitoring event. Up to 2.8 mg/l DRO, 17.0 mg/l GRO, 90 ug/l benzene, and 140 ug/l lead in the 4 monitoring wells sampled. Contamination concentrations increased in 3 of the 4 monitoring wells sampled. Depth to groundwater was 4.20 to 5.45 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was not sampled this monitoring event. Each monitoring well was sampled with no purge (Hydrasleeve). Because the samples were not collected with Hyrasleeve at the top 3 feet of the water column (the top foot of water in each monitoring well was not sampled), the results are considered biased low and can't be used to evaluate trends and extent of the contamination.	Robert Weimer
2/5/2015	Document, Report, or Work plan Review - other	June 5, 2014 groundwater monitoring event. Up to 2.0 mg/l DRO, 5.2 mg/l GRO, 25 ug/l benzene, and 14 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.46 to 6.20 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging. Since 9 of the 10 samples were not collected within the top of the water column as required (the pump intake was not in the top foot of water in the monitoring well, it ranged between 1.84 to 2.12 feet below the soil/water interface), so the results in those 9 monitoring wells are considered biased low and can't be used to evaluate trends and extent of the contamination.	Robert Weimer
5/21/2015	Document, Report, or Work plan Review - other	September 22, 2014 groundwater monitoring event. Up to 1.2 mg/l DRO, 7.4 mg/l GRO, 13 ug/l benzene, and 32 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 5 of the 10 monitoring wells sampled. Depth to groundwater was 3.92 to 5.63 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging. Because the samples were not collected within the top of the water column as required so the results in those monitoring wells are considered biased low and can't be used to evaluate trends and extent of the contamination.	Robert Weimer
5/26/2015	Document, Report, or Work plan Review - other	November 11, 2014 groundwater monitoring event. Up to 1.9 mg/l DRO, 11.2 mg/l GRO, 31 ug/l benzene, and 19 ug/l lead in the 5 monitoring wells sampled. Contamination concentrations increased in 6 of the 9 monitoring wells sampled. Depth to groundwater was 5.26 to 6.70 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was not sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.	Robert Weimer
1/6/2016	Document, Report, or Work plan Review - other	April 30, 2015 groundwater monitoring event. Up to 18 mg/l DRO, 8.5 mg/l GRO, 45 ug/l benzene, and 9.6 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 5 of the 9 monitoring wells sampled. Depth to groundwater was 4.49 to 6.75 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was not sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.	Robert Weimer
1/25/2016	Update or Other Action	DEC approves extension request to submit the 2nd semi-annual 2015 groundwater monitoring report by February 29, 2016.	Robert Weimer
5/17/2016	Offsite Soil or Groundwater Disposal Approved	Approved request to dispose of 1 drum of soil cuttings generated during the 11/6/13 release investigation currently stored at 1441 C Street at the Arlington Oregon Waste Management landfill. The consultant is to provide documentation once delivery is completed.	Robert Weimer
7/8/2016	Document, Report, or Work plan Review - other	September 22, 2015 groundwater monitoring event. Up to 1.8 mg/l DRO, 7.6 mg/l GRO, 27 ug/l benzene, and 389 ug/l lead in the 6 monitoring wells sampled. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Depth to groundwater was 4.43 to 6.16 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.	Robert Weimer
8/11/2016	Document, Report, or Work plan Review - other	November 10, 2015 groundwater monitoring event. Up to 2.1 mg/l DRO, 4.9 mg/l GRO, 47 ug/l benzene, and 88.6 ug/l lead in the 6 monitoring wells sampled. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Depth to groundwater was 4.43 to 6.16 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.	Robert Weimer
8/12/2016	Update or Other Action	ADEC approves the request to reduce groundwater monitoring from 3 times a year to semi-annual at this site. ADEC requests that PAH analysis be included with the next monitoring event in monitoring wells MW-2, MW-6, MW-7, MW-8, MW-9, and MW-6 across the street. ADEC also requests, by October 1, 2016, a work plan for the installation and sampling of an additional monitoring well across the street on the Chevron 5414 property near the southeast corner of the intersection to help define the extent of the groundwater contamination for this site.	Robert Weimer
9/28/2016	Update or Other Action	ADEC request for an extension to October 3, 2016, for a work plan for the installation and sampling of an additional monitoring well across the street on the Chevron 5414 property near the southeast corner of the intersection to help define the extent of the groundwater contamination for this site.	Robert Weimer
11/4/2016	Document, Report, or Work plan Review - other	The October 3, 2016 Subsurface Investigation Work Plan is approved under the following conditions: 1. The proposed vacuum cleaning the borehole is not to be conducted within 4 feet of were volatile samples are being collected. 2. An analytical soil sample is to be collected at the soil water interface and another depth is that depth appears to be more contaminated based on field readings or observations. 3. Add EDB and 1,2-DCA to the list on analytes. The work plan is for the installation and sampling of an additional monitoring well across the street on the Chevron 5414 property near the southeast corner of the intersection to help define the extent of the groundwater contamination for this site.	Robert Weimer
2/13/2017	Document, Report, or Work plan Review - other	June 7-8, 2016 groundwater monitoring event. Up to 2.4 mg/l DRO, 6.2 mg/l GRO, 13 ug/l benzene, and non-detect ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.49 to 7.88 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.	Robert Weimer
6/22/2017	Document, Report, or Work plan Review - other	September 20, 2016 groundwater monitoring event. Up to 2.8 mg/l DRO, 11 mg/l GRO, 16 ug/l benzene, and 35.6 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 4 of the 10 monitoring wells sampled. Depth to groundwater was 4.21 to 6.01 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well except MW-6 were sampled with a bladder pump after purging from the top of the water column as required.	Robert Weimer
9/6/2017	Document, Report, or Work plan Review - other	June 2, 2017 groundwater monitoring event. Up to 4.6 mg/l DRO, 11 mg/l GRO, 31 ug/l benzene, and 8.8 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.20 to 6.35 feet below ground surface. Groundwater flow direction was toward the south by southeast. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event.	Robert Weimer
3/19/2018	Document, Report, or Work plan Review - other	August 17, 2017 groundwater monitoring event. Up to 2.0 mg/l DRO, 9.2 mg/l GRO, 15 ug/l benzene, and 10.9 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 4 of the 11 monitoring wells sampled. Depth to groundwater was 3.93 to 6.70 feet below ground surface. Groundwater flow direction was toward the south by southeast. A downgradient monitoring wells across the street at the Chevron site (MW-6 and MW-10) were sampled this monitoring event.	Robert Weimer
11/2/2018	Document, Report, or Work plan Review - other	On June 29, 2017 a soil boring at the south west corner of the intersection across the street was sampled and completed into a monitoring well (MW-10). Groundwater was encountered at 8 feet below ground surface (bgs). The monitoring well screened interval is 5 to 15 feet bgs. The two soil samples collected had up to 57 mg/kg DRO, 13 mg/kg GRO, and 0.058 mg/kg naphthalene (0.038 mg/kg cleanup level). The rest of the compounds were non-detect or below current cleanup levels.	Robert Weimer
1/30/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 75759 Historic leaky USTs.	Robert Weimer
3/13/2019	Document, Report, or Work plan Review - other	June 18, 2018 groundwater monitoring event. Up to 1.8 mg/l DRO, 5.7 mg/l GRO, 190 ug/l benzene, and 20.7 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.12 to 6.07 feet below ground surface. Groundwater flow direction was toward the south.	Robert Weimer
8/6/2019	Document, Report, or Work plan Review - other	October 30, 2018 groundwater monitoring event. Up to 2.4 mg/l DRO, 7.4 mg/l GRO, 95 ug/l benzene, and 15.9 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 5 of the 11 monitoring wells sampled. Depth to groundwater was 4.25 to 7.89 feet below ground surface. Groundwater flow direction was toward the south by southwest.	Robert Weimer
2/12/2020	Document, Report, or Work plan Review - other	April 24, 2019 groundwater monitoring event. Up to 9.9 mg/l DRO, 6.0 mg/l GRO, 12 ug/l benzene, 120 ug/l ethylbenzene, 720 ug/l total xylenes, and 7.4 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 4 of the 11 monitoring wells sampled. Depth to groundwater was 4.17 to 6.65 feet below ground surface. Groundwater flow direction was toward the south by southwest. The samples were not analyzed for full VOCs or PAHs this monitoring event. Samples were collected using a bladder pump after purging. Since the pump intake was not within the top foot of the water column as required the results may be biased low.	Robert Weimer
2/14/2020	Document, Report, or Work plan Review - other	September 16, 2019 groundwater monitoring event. There was insufficient water to sample monitoring well MW-1. Up to 1.4 mg/l DRO, 5.3 mg/l GRO, 20 ug/l benzene, 200 ug/l ethylbenzene, 1,090 ug/l total xylenes, and 11.0 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 10 of the 10 monitoring wells sampled. Depth to groundwater was 5.23 to 7.55 feet below ground surface. Groundwater flow direction was toward the south by southeast. The samples were not analyzed for full VOCs or PAHs this monitoring event. Samples were collected using a bladder pump after purging. Since the pump intake was not within the top foot of the water column as required the results may be biased low.	Robert Weimer
2/21/2020	Update or Other Action	ADEC letter requesting that Chevon submit a report summarizing all of the historic soil sampling data for this site to identify any locations that had sample results that exceed current ADEC maximum allowable and/or human health cleanup levels. The ADEC also requested that Chevron submits a work plan, including a schedule for conducting the work, for assessing those areas to evaluate whether they still exceed maximum allowable and/or human health cleanup levels. The work plan could include the removal of contaminated soil and/or groundwater in those areas to help accelerate the remediation of this site. ADEC requests that both the report and work plan be submitted by May 1, 2020.	Robert Weimer
3/12/2020	Update or Other Action	ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. ADEC is requesting full VOC (8260) and PAH analysis for monitoring wells MW-2, MW-3, MW-6 through MW-10.	Robert Weimer
3/17/2020	Document, Report, or Work plan Review - other	DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample. DEC also requested to all full VOC and PAH analysis for monitoring wells MW-2, MW-3, MW-6 through MW-10.	Robert Weimer
4/20/2020	Meeting or Teleconference Held	DEC, CEMC, and Arcadis met to discuss soil sampling in locations with human health or maximum allowable cleanup level exceedances. Discussed the need to confirm contaminant concentrations at all locations with human health or maximum allowable cleanup level exceedances and to reinstall monitoring wells to monitor contaminant concentration in groundwater if existing monitoring wells are removed during test pit advancement and soil excavation.	Rebekah Reams
5/13/2020	Document, Report, or Work plan Review - other	DEC provided comments on the Soil Investigation Work Plan submitted by Arcadis on May 1, 2020. This work plan details plans to advance three soil borings to investigate hydrocarbon impacts at previous soil boring locations at the site.	Rebekah Reams
9/30/2020	Site Characterization Workplan Approved	DEC Approved the Soil Investigation Work Plan for the site following comment resolution. This document details plans to advance five soil borings to investigation hydrocarbon impacts at previous soil boring locations.	Rebekah Reams
1/15/2021	Meeting or Teleconference Held	DEC staff met with Chevron Environmental Management Company (CEMC) and Arcadis to discuss Chevron sites located in Alaska during the Annual Portfolio Meeting on January 14th and 15th, 2021.	Rebekah Reams
7/12/2021	Document, Report, or Work plan Review - other	2020 First Semi-Annual Groundwater Monitoring event was conducted on May 4th & 5th, 2020. Groundwater samples were collected from monitoring wells MW-1 and MW-10. Monitoring wells MW-2 and MW-4 were obstructed by ice and could not be gauged or sampled. Monitoring wells MW-3 and MW-5 through MW-9 had insufficient water to sample due to possible ice obstructions. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the southeast and depth to groundwater was 3.26 to 6.76 feet below ground surface. Duplicate sample was collected at MW-1, which is only sampled for lead and geochemical parameters, therefore no duplicate sample was submitted for GRO, DRO, VOC, or PAH analysis during this sample event.	Rebekah Reams
7/12/2021	Document, Report, or Work plan Review - other	2020 Second Semi-Annual Groundwater Monitoring event was conducted on October 23rd & 24th, 2020. Groundwater samples were collected from monitoring wells MW-1 through MW-10. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 4.70 to 7.05 feet below ground surface.	Rebekah Reams
7/12/2021	Document, Report, or Work plan Review - other	2021 First Semi-Annual Groundwater Monitoring event was conducted on May 3rd & 4th, 2021. Groundwater samples were collected from monitoring wells MW-1, MW-3, MW-9 and MW-10. Monitoring wells MW-2, MW-5, and MW-7 were unable to be sampled due to ice obstructions within the well casing. Monitoring wells MW-4, MW-6, and MW-8 did not contain enough water to collect samples. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 3.60 to 6.68 feet below ground surface.	Rebekah Reams
10/14/2021	Update or Other Action	ADEC was notified that this property has transferred from Steve Wuerth to Tony Gatz and Harlia Pace of the Alaska Cycle Center.	Rebekah Reams
3/18/2022	Document, Report, or Work plan Review - other	2021 Second Semi-Annual Groundwater Monitoring event was conducted on October 6th, 2021. Groundwater samples were collected from monitoring wells MW-1 through MW-10. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 4.29 to 6.99 feet below ground surface.	Rebekah Reams
4/6/2022	Document, Report, or Work plan Review - other	DEC provided comments on the Soil Investigation Work Plan. This document details plans to advance four soil borings to further delineate the remaining contamination on the site in the vicinity of the former UST basin and southeast of SB20-3 to confirm remaining contamination is bound to the site.	Rebekah Reams
4/6/2022	Offsite Soil or Groundwater Disposal Approved	DEC approved the transport of 0.25 cubic yards of soil generated during 2021 field activities.	Rebekah Reams
5/4/2022	Document, Report, or Work plan Review - other	DEC approved the Revised Soil Investigation Work Plan submitted May 4, 2022. This document addresses ADEC comments and details plans to advance four soil borings to further delineate the remaining contamination in the vicinity of the former UST basin and southeast of SB20-3 to confirm remaining contamination is bound to the site. Work is scheduled to begin June 1, 2022.	Rebekah Reams
7/8/2022	Long Term Monitoring Workplan or Report Review	2022 First Semi-Annual Groundwater Monitoring event was conducted on April 25, 2022. Groundwater samples were collected from monitoring wells MW-1, MW-6, and MW-10. Monitoring wells MW-2, MW-3, MW-5, MW-7, MW-8, and MW-9 were frozen and unable to gauge or sample. Well MW-4 had insufficient water to sample. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 3.75 to 7.02 feet below ground surface.	Rebekah Reams
9/29/2022	Document, Report, or Work plan Review - other	ADEC provided comments on the Treatment of Purge Water Utilizing Granular Activated Carbon (GAC) at Chevron Environmental Management Company Sites which includes standard operating procedures and breakthrough estimates proposed for use at this site.	Rebekah Reams
10/10/2022	Document, Report, or Work plan Review - other	Subsurface soil investigation work was completed in June 2022 which included the advancement of SB22-6 through SB22-9 to confirm and characterize soil impacts adjacent to the former dispenser islands, the former UST basin, the former used oil UST and at soil boring locations that previously exceeded applicable screening levels. Highest contaminant concentrations detected during this sampling event were along the property boundary near International Airport Road at boring SB22-7. Concentrations of GRO, DRO, BTEX, naphthalene and select additional VOCs and PAHs exceeded cleanup levels during this sampling event.	Rebekah Reams
12/23/2022	Offsite Soil or Groundwater Disposal Approved	DEC approved transport of one 55-gallon drum of purge water for offsite disposal	Rebekah Reams
4/7/2023	Long Term Monitoring Workplan or Report Review	ADEC approved the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum which will update the groundwater monitoring schedule to include a revised analyte list for site wells on a semi-annual basis.	Rebekah Reams
11/29/2023	Site Visit	ADEC staff visited the site to observe current site use, layout, and monitoring well locations.	Rebekah Reams

Action Date

Action

Description

DEC Staff

8/12/2008

Spill Transferred from Prevention Preparedness and Response Program

Site transferred by PERP staff Frank Wesser. Spill Number = 07239932401; Spill Date 11/20/07; Substance = Gasoline; Quantity Unknown.

Mitzi Read

8/15/2008

Site Added to Database

Site added to the database.

Mitzi Read

8/18/2008

Exposure Tracking Model Ranking

Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.

Grant Lidren

2/9/2009

Update or Other Action

The RP for this site is Chevron. Contact: Greg Barton, Chevron Environmental Management Company, 611 Bollinger Canyon Road, Room 3620, San Ramon, CA 94583. The consultant for Chevron on this site is ARCADIS US Inc.

Robert Weimer

2/25/2009

Meeting or Teleconference Held

Meeting with Chevron and their consultants. ADEC will send a letter requesting a release investigation workplan to define the extent of the soil and groundwater contamination at this site, and to install monitoring wells and monitor the groundwater on a quarterly basis for BTEX, GRO, DRO, and lead. The release investigation is to be followed by the submittal of a corrective action plan to address the remaining soil and groundwater contamination at this site.

Robert Weimer

4/24/2009

Potentially Responsible Party/State Interest Letter

Potential responsible party letter send to Chevron.

Robert Weimer

4/24/2009

Update or Other Action

ADEC letter sent to Chevron requesting that the seven monitoring wells be sampled on a quarterly basis for BTEX, GRO, DRO, and lead along with groundwater elevations, with the results of the next groundwater monitoring event submitted by June 1, 2009. ADEC also requests that you conduct a release investigation to define the extent of the soil and groundwater contamination at this site. ADEC requests that you submit a release investigation workplan by June 1, 2009. ADEC also requests that you conduct an indoor air evaluation for this site and submit the results by December 1, 2009. ADEC requests that you submit a corrective action plan by December 1, 2009 to address the remaining soil and groundwater contamination identified the by the existing sampling and requested release investigation sampling at this site.

Robert Weimer

5/19/2009

Update or Other Action

ADEC approves request for an extension to July 15, 2009 to submit the groundwater monitoring report and workplan for conducting a release investigation to define the extent of the soil and groundwater contamination. The groundwater monitoring is to be conducted at the end of May.

Robert Weimer

6/12/2009

Offsite Soil or Groundwater Disposal Approved

Review and approve treatment of 1 drum of purge water.

Robert Weimer

6/23/2009

Site Visit

At the request of Robert Weimer, the project manager, a quality assurance site inspection was conducted on 5/27/09. Upon arival, the consultant was currently sampling two wells, MW-6 and MW-7, simultaneously with two seperate sampling systems. The only observed deviation was the use of sampling equipment and measurements with a car idling nearby. However, after discussion with the sampling crew it was determined that the impact to the sample results would be minimal. A copy of the site inspection report will be placed in the site file and in the QA file.

Brenton Porter

7/21/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves plan to thermally treat 5 drums of BTEX/GRO/DRO/RRO contaminated drill cuttings from the 2007 site assessment work.

Robert Weimer

7/27/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves plan to treat 15 gallons of contaminated purge water from the 2007 site assessment work.

Robert Weimer

9/1/2009

Document, Report, or Work plan Review - other

May 26-27, 2009 groundwater monitoring event. Up to 11 mg/l DRO, 0.88 mg/l GRO, 41 ug/l benzene, and 22 ug/l lead in the 7 monitoring wells sampled. Contamination concentrations appear to be increasing. Depth to groundwater was 4.24 to 5.98 feet below ground surface. Groundwater flow direction was toward the south.

Robert Weimer

9/9/2009

Document, Report, or Work plan Review - other

Review and approve request to transport to and store soil cutting and purge water generated during the upcoming September 2009 site work at a secure location at 1441 C street.

Robert Weimer

9/15/2009

Document, Report, or Work plan Review - other

Reviewed July 8, 2009 workplan for release investigation. The workplan proposes to sample 4 soil borings to help define the extent of the soil contamination identified at monitoring well MW-4 and MW-5. The soil samples are to be analyzed for DRO/GRO/BTEX/Lead. Need soil samples collected at soil/water interface (around 6 feet below ground surface). No air-knife allowed due to shallow borings and volatile samples. Need additional borings completed as monitoring wells south of monitoring wells MW-6 and MW-7. These additional monitoring wells are to be sampled for BTEX, GRO, DRO, and lead on a quarterly basis.

Robert Weimer

9/21/2009

Site Visit

Discuss site with RP's consultant, site visit to discuss site work and monitoring well placement. One monitoring well is to be installed to the south of monitoring well MW-6. One more monitoring well is to be installed to the south of monitoring well MW-7.

Robert Weimer

9/22/2009

Document, Report, or Work plan Review - other

On September 21-21, 2009 six soil borings were sampled and two were completed as monitoring wells to help define the extent of the soil and groundwater contamination at the site. Up to 455 mg/kg DRO, 4,290 mg/kg GRO, 0.422 mg/kg benzene, and 17.6 mg/kg lead was found in the soils sampled. The highest contaminant concentrations are near the soil/water interface at 5.5 to 6.5 feet below ground surface.

Robert Weimer

9/23/2009

Document, Report, or Work plan Review - other

ADEC approves request to transport 2 super sacks of contaminated drill cuttings generated during the September release investigation work to the 15th & C secure area for storage.

Robert Weimer

11/23/2009

Update or Other Action

Approved request for extension to March 31, 2010 for submitting a corrective action plan for this site.

Robert Weimer

11/24/2009

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for thermal treatment of 2 super sacks of contaminated drill cuttings generated during the September release investigation work.

Robert Weimer

1/6/2010

Offsite Soil or Groundwater Disposal Approved

Review and approve treatment of 1 drum of purge water.

Robert Weimer

2/17/2010

Document, Report, or Work plan Review - other

September 24, 2009 groundwater monitoring event. Up to 4.4 mg/l DRO, 31 mg/l GRO, 66 ug/l benzene, and 1,000 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations appear to be increasing. Depth to groundwater was 5.09 to 6.88 feet below ground surface. Groundwater flow direction was toward the south.

Robert Weimer

3/1/2010

Document, Report, or Work plan Review - other

November 9, 2009 groundwater monitoring event. Up to 5.1 mg/l DRO, 30 mg/l GRO, 110 ug/l benzene, and 1,000 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 3 of the 9 monitoring wells sampled. Depth to groundwater was 5.60 to 6.78 feet below ground surface. Groundwater flow direction was toward the south. Sheen and fuel odor we noted in monitoring well MW-9 which had 30 mg/l GRO and 57 ug/l benzene.

Robert Weimer

3/4/2010

Document, Report, or Work plan Review - other

ADEC approves request to transport drums of monitoring well purge water to 1441 C Street for secure storage.

Robert Weimer

3/16/2010

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 3/10/10. MW8 & MW9 are to be sampled for PAH the next monitoring event. Chevron will submit the results of the release investigation work conducted on 9/21/09. Chevron is to conduct a preferential pathway assessment for International Airport Road for the shallow groundwater contamination (depth to water 5.84 ft below ground surface in nearby monitoring well MW9). We discussed that the contamiantion is shallow and can be accessed by excavation. We discussed that groundwater samples for volatiles should not be collected with bailers or peristaltic pumps due to the loss of volatiles, Chevron is to provide a workplan specifying how groundwater samples will be collected in the future.

Robert Weimer

4/8/2010

Offsite Soil or Groundwater Disposal Approved

Review and approve treatment of 1 drum of purge water.

Robert Weimer

4/9/2010

Document, Report, or Work plan Review - other

DEC review of Site Vapor Intrusion Evaluation report for this site. The report concluded that this site does not have a potential for vapor intrusion based on structures currently being more than 30 feet away from the remaining soil and groundwater contamination at this site. The vapor intrustion evaluation may need to be updated based on future structures that could be constructed at or near the site.

Robert Weimer

5/20/2010

Update or Other Action

Approved, until further notice, no-purge groundwater sampling at this site.

Robert Weimer

8/23/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

8/27/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

11/3/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

2/2/2011

Document, Report, or Work plan Review - other

March 3, 2010 groundwater monitoring event. Up to 2.3 mg/l DRO, 1.1 mg/l GRO, 9.4 ug/l benzene, and 239 ug/l lead in the 6 monitoring wells sampled (3 other monitoring wells were not sampled due to snow cover, this included the two most contaminated wells MW-8 and MW-9). Contamination concentrations increased in 1 of the 6 monitoring wells sampled. Depth to groundwater was 6.72 to 7.87 feet below ground surface. Groundwater flow direction was toward the southwest. The consultant recommends continued quarterly groundwater monitoring.

Robert Weimer

2/3/2011

Document, Report, or Work plan Review - other

May 7, 2010 groundwater monitoring event. Up to 22 mg/l DRO, 38 mg/l GRO, 91 ug/l benzene, and 84 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 3 of the 9 monitoring wells sampled. Depth to groundwater was 4.15 to 6.24 feet below ground surface. Groundwater flow direction was toward the southeast. The consultant recommends continued quarterly groundwater monitoring.

Robert Weimer

2/3/2011

Document, Report, or Work plan Review - other

July 7, 2010 groundwater monitoring event. Up to 7.3 mg/l DRO, 27 mg/l GRO, 81 ug/l benzene, and 52.6 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 7 of the 9 monitoring wells sampled. Depth to groundwater was 4.83 to 6.48 feet below ground surface. Groundwater flow direction was toward the southeast. The consultant recommends semi-annual monitoring in MW1, MW-3, MW-4,and MW-5, and quarterly groundwater monitoring in the rest of the monitoring wells.

Robert Weimer

2/4/2011

Document, Report, or Work plan Review - other

October 4, 2010 groundwater monitoring event. Up to 2.7 mg/l DRO, 39 mg/l GRO, 120 ug/l benzene, and 72.4 ug/l lead in the 8 monitoring wells sampled. Contamination concentrations increased in 6 of the 8 monitoring wells sampled. Depth to groundwater was 5.13 to 6.38 feet below ground surface. Groundwater flow direction was toward the southeast. The consultant recommends semi-annual monitoring in MW1, MW-3, MW-4,and MW-5, and quarterly groundwater monitoring in the rest of the monitoring wells. Most samples recieved at lab over temperature, some results may be biased low.

Robert Weimer

2/4/2011

Update or Other Action

DEC approves request for semi-annual monitoring in MW1, MW-3, MW-4,and MW-5, and quarterly groundwater monitoring in the rest of the monitoring wells; and suspending PAH sampling of groundwater at the site.

Robert Weimer

2/4/2011

Document, Report, or Work plan Review - other

On September 2009 six soil borings were sampled and two of them were completed as monitoring wells (MW-8 and MW-9). Up to 455 mg/kg DRO, 4290 mg/kg GRO, 0.422 mg/kg benzene, and 17.6 mg/kg lead in the soil samples collected. The highest GRO and DRO contamination was found at 5.5 to 6.5 feet below ground surface. The highest benzene contamination was found at 15 feet below ground surface at MW-8. The extent of the contamination to the south (down gradient) has not been defined. Sheens noted on soils from monitoring well MW-9. The field notes document that some hydraulic fluid spilled from the direct push rig during the installation of monitoring well MW-9.

Robert Weimer

2/15/2011

Document, Report, or Work plan Review - other

DEC review of corrective action plan. The plan evaluated three corrective action methods: Excavation, Soil Vapor Extraction/Air Sparging, and Monitoried Natural Attenuation (MNA). Some MNA data was collected in 2009. The plan recommends continued groundwater monitoring to evlauate MNA effectiveness and to review utilites near the site to assess subsurface preferential pathways.

Robert Weimer

3/2/2011

Document, Report, or Work plan Review - other

ADEC approves temporary storage of any purgewater generated in 2011 at the secure area at 1441 C Street.

Robert Weimer

6/3/2011

Update or Other Action

ADEC approves request for suspending, until further notice, the sampling of MW-1, MW-4, and MW-5 for DRO, GRO, and BTEX.

Robert Weimer

10/25/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

11/3/2011

Document, Report, or Work plan Review - other

ADEC approves temporary storage of any purgewater generated in Fall of 2011 at the secure area at 1441 C Street.

Robert Weimer

11/21/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of purgewater generated in Fall 2011 groundwater monitoring event.

Robert Weimer

12/13/2011

Document, Report, or Work plan Review - other

April 20, 2011 groundwater monitoring event. Up to 5.2 mg/l DRO, 11.0 mg/l GRO, 30 ug/l benzene, and 37.8 ug/l lead in the 8 monitoring wells sampled. Contamination concentrations increased in 5 of the 8 monitoring wells sampled. Depth to groundwater was 3.32 to 5.79 feet below ground surface. Groundwater flow direction was toward the southwest. Volatile samples collected with Hydrasleeve or bladder pump, other samples collected with bailer.

Robert Weimer

1/24/2012

Update or Other Action

ADEC approves request, due to weather conditions, to skip 1st quarter 2012 groundwater monitoring event.

Robert Weimer

2/3/2012

Document, Report, or Work plan Review - other

Preferential pathway study reviewed depth to groundwater in relation to depth of burial of utilities near the contamination indentified at this site. Historic groundwater in the site monitoring wells has been between 3.3 and 6.8 feet below ground surface (bgs). Typical utility burial is 3 to 12 ft bgs. The consultant identified utilities down gradient that may create groundwater preferential pathways for the site.

Robert Weimer

2/3/2012

Document, Report, or Work plan Review - other

June 7, 2011 groundwater monitoring event. Up to 5.5 mg/l DRO, 25 mg/l GRO, 170 ug/l benzene, and 75.1 ug/l lead in the 8 monitoring wells sampled. Contamination concentrations increased in 5 of the 8 monitoring wells sampled. Depth to groundwater was 4.71 to 6.14 feet below ground surface. Groundwater flow direction was toward the south. Volatile samples collected with Hydrasleeve, other samples collected with bailer. Monitoring well MW-3 needs to be repaired.

Robert Weimer

3/1/2012

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/28/12. Chevron is to continue to conduct quarterly groundwater sampling, propose what additional assessment work to evaluate preperential parthways that have been identified, repair monitoring well MW-3, and provide a corrective action plan for the remaining soil and groundwater contamination at the site.

Robert Weimer

8/21/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

11/28/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

12/18/2012

Document, Report, or Work plan Review - other

September 16, 2011 groundwater monitoring event. Up to 3.7 mg/l DRO, 26 mg/l GRO, 100 ug/l benzene, and 351 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 5 of the 9 monitoring wells sampled. Volatile samples collected with Hydrasleeve, other samples collected with bailer.

Robert Weimer

12/19/2012

Document, Report, or Work plan Review - other

October 31, 2011 groundwater monitoring event. Up to 5.5 mg/l DRO, 18 mg/l GRO, 47 ug/l benzene, and 155 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 7 of the 9 monitoring wells sampled. Volatile samples collected with Hydrasleeve, other samples collected with bailer.

Robert Weimer

12/20/2012

Document, Report, or Work plan Review - other

June 20, 2012 groundwater monitoring event. Up to 3.3 mg/l DRO, 23 mg/l GRO, 65 ug/l benzene, and 41.8 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 6 of the 9 monitoring wells sampled. Depth to groundwater was 4.28 to 5.55 feet below ground surface. Groundwater flow direction was toward the south by southeast. Volatile samples collected with Hydrasleeve, other samples collected with bailer. Monitoring well MW-3 needs to be repaired.

Robert Weimer

1/28/2013

Document, Report, or Work plan Review - other

September 19, 2012 groundwater monitoring event. Up to 2.2 mg/l DRO, 8.1 mg/l GRO, 43 ug/l benzene, and 85.8 ug/l lead in the 7 monitoring wells sampled. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Depth to groundwater was 3.40 to 5.03 feet below ground surface. Groundwater flow direction was toward the southeast. Volatile samples collected with Hydrasleeve, other samples collected with bailer. Monitoring well MW-3 needs to be repaired.

Robert Weimer

2/25/2013

Document, Report, or Work plan Review - other

November 7, 2012 groundwater monitoring event. Up to 2.1 mg/l DRO, 10 mg/l GRO, 100 ug/l benzene, and 92.5 ug/l lead in the 6 monitoring wells sampled. Contamination concentrations increased in 5 of the 6 monitoring wells sampled. Depth to groundwater was 3.95 to 5.13 feet below ground surface. Groundwater flow direction was toward the south. Volatile samples collected with Hydrasleeve, other samples collected with bailer. The volatile samples may be biased low because the sample interval was not documented.

Robert Weimer

2/26/2013

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/26/13. Chevron proposes to continue to conduct quarterly groundwater monitoring to monitor for natural attenuation and trends, an updated preferential pathway assessment plan. Based on the results of the preferential pathway assessment the will submit an new corrective action plan for the enhanced or active treatment. The next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data. We discussed that all semi-annual monitoring events need to be at least 120 days apart.

Robert Weimer

3/26/2013

Update or Other Action

DEC conditionally approves the use of a portable activated carbon (gac) filter system for this site to treat water generated during groundwater monitoring. The storage of water at the site or the secure storage area at 1441 C Street is also approved.

Robert Weimer

6/14/2013

Update or Other Action

RPs consultant requested delaying conducting the porposed preferential pathway monitoring wells until after active treatment has occurred, in that case DEC is requesting the corrective action plan (including a schedule for conducting the work) be submitted by August 1, 2013.

Robert Weimer

6/18/2013

Update or Other Action

RPs consultant will either conduct preferential pathway assessment in 2013 and conduct active treatment in 2014 or conduct active treatment in 2013 and collect peferential assessment as part of the active treatment work.

Robert Weimer

6/28/2013

Site Visit

Site visit to observe current site conditions.

Robert Weimer

10/28/2013

Document, Report, or Work plan Review - other

June 8, 2013 groundwater monitoring event. Up to 11.0 mg/l DRO, 15.7 mg/l GRO, 32 ug/l benzene, and 25 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 8 of the 10 monitoring wells sampled. Depth to groundwater was 4.08 to 6.99 feet below ground surface. Groundwater flow direction was toward the southeast. A downgradient monitoring well across the street at the Chevron site (MW-6) had 2.1 mg/l DRO, non-detect (<0.05 mg/l) GRO, non-detect (<0.23 ug/l) benzene, and 25 ug/l lead. Each monitoring well was sampled twice: once with no purge (Hydrasleeve), and then after purging (bladder pump). Results of the Hydrasleeve are biased low because the water column sampled did not include the surface of the groundwater, the top of the water column sampled ranged from 3.0 to 31.8 inches below the surface of the groundwater. Results of the purge samples may also be biased low because the depth of the pump intake was not documented in the field notes. Not possible to compare the no purge and purge results because of problems with the interval sampled.

Robert Weimer

11/8/2013

Update or Other Action

Approved request to transport 1 drum of soil cuttings and 1 drum of decontamination water generated during the 11/6/13 release investigation to the secure storage area at 1441 C Street.

Robert Weimer

2/11/2014

Document, Report, or Work plan Review - other

August 18, 2013 groundwater monitoring event. Up to 2.2 mg/l DRO, 17.7 mg/l GRO, 20 ug/l benzene, and 65 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 9 monitoring wells sampled. Depth to groundwater was 4.43 to 6.61 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) had 2.1 mg/l DRO, non-detect (<0.05 mg/l) GRO, non-detect (<0.24 ug/l) benzene, and 23 ug/l lead. Each monitoring well was sampled twice: once with no purge (Hydrasleeve), and then after purging (bladder pump). Volatile samples were collected with Hyrasleeve at the top 3 feet of the water column, non-volatiles were collected with a bailer.

Robert Weimer

2/20/2014

Update or Other Action

ADEC approves request, due to ice in the monitoring wells during the spring monitoring events, to skip 1st quarter groundwater monitoring events until futher notice.

Robert Weimer

2/21/2014

Document, Report, or Work plan Review - other

On November 6, 2013 four soil borings were sampled. Up to 260 mg/kg DRO, 1,600 mg/kg GRO, 0.931 mg/kg benzene, and 13.4 mg/kg total lead in the soil samples collected. Groundwater was encountered between 5.0 to 7.5 feet below ground surface. CRA plans to submit a work plan to DEC by May 1, 2014 for the active remediation of the site.

Robert Weimer

2/27/2014

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/27/2014. They plan to continue tri-annual groundwater monitoring. Because of problems with last year’s purge/no-purge sampling the next groundwater sampling event they will sample both using no purge and purge help evaluate that the past no purge results were providing comparable data or they will switch to no purge for future sampling events. The consultant will make sure that their site reports are complete in accordance with DEC’s 9/23/2009 Site Characterization Work Plan and Reporting Guidance for Investigation of Contaminated Sites. DEC to send a letter requesting active remediation at this site in 2014.

Robert Weimer

9/8/2014

Document, Report, or Work plan Review - other

November 4, 2013 groundwater monitoring event. Up to 2.8 mg/l DRO, 17.0 mg/l GRO, 90 ug/l benzene, and 140 ug/l lead in the 4 monitoring wells sampled. Contamination concentrations increased in 3 of the 4 monitoring wells sampled. Depth to groundwater was 4.20 to 5.45 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was not sampled this monitoring event. Each monitoring well was sampled with no purge (Hydrasleeve). Because the samples were not collected with Hyrasleeve at the top 3 feet of the water column (the top foot of water in each monitoring well was not sampled), the results are considered biased low and can't be used to evaluate trends and extent of the contamination.

Robert Weimer

2/5/2015

Document, Report, or Work plan Review - other

June 5, 2014 groundwater monitoring event. Up to 2.0 mg/l DRO, 5.2 mg/l GRO, 25 ug/l benzene, and 14 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.46 to 6.20 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging. Since 9 of the 10 samples were not collected within the top of the water column as required (the pump intake was not in the top foot of water in the monitoring well, it ranged between 1.84 to 2.12 feet below the soil/water interface), so the results in those 9 monitoring wells are considered biased low and can't be used to evaluate trends and extent of the contamination.

Robert Weimer

5/21/2015

Document, Report, or Work plan Review - other

September 22, 2014 groundwater monitoring event. Up to 1.2 mg/l DRO, 7.4 mg/l GRO, 13 ug/l benzene, and 32 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 5 of the 10 monitoring wells sampled. Depth to groundwater was 3.92 to 5.63 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging. Because the samples were not collected within the top of the water column as required so the results in those monitoring wells are considered biased low and can't be used to evaluate trends and extent of the contamination.

Robert Weimer

5/26/2015

Document, Report, or Work plan Review - other

November 11, 2014 groundwater monitoring event. Up to 1.9 mg/l DRO, 11.2 mg/l GRO, 31 ug/l benzene, and 19 ug/l lead in the 5 monitoring wells sampled. Contamination concentrations increased in 6 of the 9 monitoring wells sampled. Depth to groundwater was 5.26 to 6.70 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was not sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.

Robert Weimer

1/6/2016

Document, Report, or Work plan Review - other

April 30, 2015 groundwater monitoring event. Up to 18 mg/l DRO, 8.5 mg/l GRO, 45 ug/l benzene, and 9.6 ug/l lead in the 9 monitoring wells sampled. Contamination concentrations increased in 5 of the 9 monitoring wells sampled. Depth to groundwater was 4.49 to 6.75 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was not sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.

Robert Weimer

1/25/2016

Update or Other Action

DEC approves extension request to submit the 2nd semi-annual 2015 groundwater monitoring report by February 29, 2016.

Robert Weimer

5/17/2016

Offsite Soil or Groundwater Disposal Approved

Approved request to dispose of 1 drum of soil cuttings generated during the 11/6/13 release investigation currently stored at 1441 C Street at the Arlington Oregon Waste Management landfill. The consultant is to provide documentation once delivery is completed.

Robert Weimer

7/8/2016

Document, Report, or Work plan Review - other

September 22, 2015 groundwater monitoring event. Up to 1.8 mg/l DRO, 7.6 mg/l GRO, 27 ug/l benzene, and 389 ug/l lead in the 6 monitoring wells sampled. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Depth to groundwater was 4.43 to 6.16 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.

Robert Weimer

8/11/2016

Document, Report, or Work plan Review - other

November 10, 2015 groundwater monitoring event. Up to 2.1 mg/l DRO, 4.9 mg/l GRO, 47 ug/l benzene, and 88.6 ug/l lead in the 6 monitoring wells sampled. Contamination concentrations increased in 3 of the 6 monitoring wells sampled. Depth to groundwater was 4.43 to 6.16 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.

Robert Weimer

8/12/2016

Update or Other Action

ADEC approves the request to reduce groundwater monitoring from 3 times a year to semi-annual at this site. ADEC requests that PAH analysis be included with the next monitoring event in monitoring wells MW-2, MW-6, MW-7, MW-8, MW-9, and MW-6 across the street. ADEC also requests, by October 1, 2016, a work plan for the installation and sampling of an additional monitoring well across the street on the Chevron 5414 property near the southeast corner of the intersection to help define the extent of the groundwater contamination for this site.

Robert Weimer

9/28/2016

Update or Other Action

ADEC request for an extension to October 3, 2016, for a work plan for the installation and sampling of an additional monitoring well across the street on the Chevron 5414 property near the southeast corner of the intersection to help define the extent of the groundwater contamination for this site.

Robert Weimer

11/4/2016

Document, Report, or Work plan Review - other

The October 3, 2016 Subsurface Investigation Work Plan is approved under the following conditions: 1. The proposed vacuum cleaning the borehole is not to be conducted within 4 feet of were volatile samples are being collected. 2. An analytical soil sample is to be collected at the soil water interface and another depth is that depth appears to be more contaminated based on field readings or observations. 3. Add EDB and 1,2-DCA to the list on analytes. The work plan is for the installation and sampling of an additional monitoring well across the street on the Chevron 5414 property near the southeast corner of the intersection to help define the extent of the groundwater contamination for this site.

Robert Weimer

2/13/2017

Document, Report, or Work plan Review - other

June 7-8, 2016 groundwater monitoring event. Up to 2.4 mg/l DRO, 6.2 mg/l GRO, 13 ug/l benzene, and non-detect ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.49 to 7.88 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well was sampled with a bladder pump after purging from the top of the water column as required.

Robert Weimer

6/22/2017

Document, Report, or Work plan Review - other

September 20, 2016 groundwater monitoring event. Up to 2.8 mg/l DRO, 11 mg/l GRO, 16 ug/l benzene, and 35.6 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 4 of the 10 monitoring wells sampled. Depth to groundwater was 4.21 to 6.01 feet below ground surface. Groundwater flow direction was toward the south. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event. Each monitoring well except MW-6 were sampled with a bladder pump after purging from the top of the water column as required.

Robert Weimer

9/6/2017

Document, Report, or Work plan Review - other

June 2, 2017 groundwater monitoring event. Up to 4.6 mg/l DRO, 11 mg/l GRO, 31 ug/l benzene, and 8.8 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.20 to 6.35 feet below ground surface. Groundwater flow direction was toward the south by southeast. A downgradient monitoring well across the street at the Chevron site (MW-6) was sampled this monitoring event.

Robert Weimer

3/19/2018

Document, Report, or Work plan Review - other

August 17, 2017 groundwater monitoring event. Up to 2.0 mg/l DRO, 9.2 mg/l GRO, 15 ug/l benzene, and 10.9 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 4 of the 11 monitoring wells sampled. Depth to groundwater was 3.93 to 6.70 feet below ground surface. Groundwater flow direction was toward the south by southeast. A downgradient monitoring wells across the street at the Chevron site (MW-6 and MW-10) were sampled this monitoring event.

Robert Weimer

11/2/2018

Document, Report, or Work plan Review - other

On June 29, 2017 a soil boring at the south west corner of the intersection across the street was sampled and completed into a monitoring well (MW-10). Groundwater was encountered at 8 feet below ground surface (bgs). The monitoring well screened interval is 5 to 15 feet bgs. The two soil samples collected had up to 57 mg/kg DRO, 13 mg/kg GRO, and 0.058 mg/kg naphthalene (0.038 mg/kg cleanup level). The rest of the compounds were non-detect or below current cleanup levels.

Robert Weimer

1/30/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 75759 Historic leaky USTs.

Robert Weimer

3/13/2019

Document, Report, or Work plan Review - other

June 18, 2018 groundwater monitoring event. Up to 1.8 mg/l DRO, 5.7 mg/l GRO, 190 ug/l benzene, and 20.7 ug/l lead in the 10 monitoring wells sampled. Contamination concentrations increased in 6 of the 10 monitoring wells sampled. Depth to groundwater was 4.12 to 6.07 feet below ground surface. Groundwater flow direction was toward the south.

Robert Weimer

8/6/2019

Document, Report, or Work plan Review - other

October 30, 2018 groundwater monitoring event. Up to 2.4 mg/l DRO, 7.4 mg/l GRO, 95 ug/l benzene, and 15.9 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 5 of the 11 monitoring wells sampled. Depth to groundwater was 4.25 to 7.89 feet below ground surface. Groundwater flow direction was toward the south by southwest.

Robert Weimer

2/12/2020

Document, Report, or Work plan Review - other

April 24, 2019 groundwater monitoring event. Up to 9.9 mg/l DRO, 6.0 mg/l GRO, 12 ug/l benzene, 120 ug/l ethylbenzene, 720 ug/l total xylenes, and 7.4 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 4 of the 11 monitoring wells sampled. Depth to groundwater was 4.17 to 6.65 feet below ground surface. Groundwater flow direction was toward the south by southwest. The samples were not analyzed for full VOCs or PAHs this monitoring event. Samples were collected using a bladder pump after purging. Since the pump intake was not within the top foot of the water column as required the results may be biased low.

Robert Weimer

2/14/2020

Document, Report, or Work plan Review - other

September 16, 2019 groundwater monitoring event. There was insufficient water to sample monitoring well MW-1. Up to 1.4 mg/l DRO, 5.3 mg/l GRO, 20 ug/l benzene, 200 ug/l ethylbenzene, 1,090 ug/l total xylenes, and 11.0 ug/l lead in the 11 monitoring wells sampled. Contamination concentrations increased in 10 of the 10 monitoring wells sampled. Depth to groundwater was 5.23 to 7.55 feet below ground surface. Groundwater flow direction was toward the south by southeast. The samples were not analyzed for full VOCs or PAHs this monitoring event. Samples were collected using a bladder pump after purging. Since the pump intake was not within the top foot of the water column as required the results may be biased low.

Robert Weimer

2/21/2020

Update or Other Action

ADEC letter requesting that Chevon submit a report summarizing all of the historic soil sampling data for this site to identify any locations that had sample results that exceed current ADEC maximum allowable and/or human health cleanup levels. The ADEC also requested that Chevron submits a work plan, including a schedule for conducting the work, for assessing those areas to evaluate whether they still exceed maximum allowable and/or human health cleanup levels. The work plan could include the removal of contaminated soil and/or groundwater in those areas to help accelerate the remediation of this site. ADEC requests that both the report and work plan be submitted by May 1, 2020.

Robert Weimer

3/12/2020

Update or Other Action

ADEC requests for this site that the monitoring wells are purged prior to sampling, and that the intake of the bladder pump/in-well pump be documented in the field notes to be within the top foot of the water column at the time of the sampling. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. ADEC is requesting full VOC (8260) and PAH analysis for monitoring wells MW-2, MW-3, MW-6 through MW-10.

Robert Weimer

3/17/2020

Document, Report, or Work plan Review - other

DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample. DEC also requested to all full VOC and PAH analysis for monitoring wells MW-2, MW-3, MW-6 through MW-10.

Robert Weimer

4/20/2020

Meeting or Teleconference Held

DEC, CEMC, and Arcadis met to discuss soil sampling in locations with human health or maximum allowable cleanup level exceedances. Discussed the need to confirm contaminant concentrations at all locations with human health or maximum allowable cleanup level exceedances and to reinstall monitoring wells to monitor contaminant concentration in groundwater if existing monitoring wells are removed during test pit advancement and soil excavation.

Rebekah Reams

5/13/2020

Document, Report, or Work plan Review - other

DEC provided comments on the Soil Investigation Work Plan submitted by Arcadis on May 1, 2020. This work plan details plans to advance three soil borings to investigate hydrocarbon impacts at previous soil boring locations at the site.

Rebekah Reams

9/30/2020

Site Characterization Workplan Approved

DEC Approved the Soil Investigation Work Plan for the site following comment resolution. This document details plans to advance five soil borings to investigation hydrocarbon impacts at previous soil boring locations.

Rebekah Reams

1/15/2021

Meeting or Teleconference Held

DEC staff met with Chevron Environmental Management Company (CEMC) and Arcadis to discuss Chevron sites located in Alaska during the Annual Portfolio Meeting on January 14th and 15th, 2021.

Rebekah Reams

7/12/2021

Document, Report, or Work plan Review - other

2020 First Semi-Annual Groundwater Monitoring event was conducted on May 4th & 5th, 2020. Groundwater samples were collected from monitoring wells MW-1 and MW-10. Monitoring wells MW-2 and MW-4 were obstructed by ice and could not be gauged or sampled. Monitoring wells MW-3 and MW-5 through MW-9 had insufficient water to sample due to possible ice obstructions. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the southeast and depth to groundwater was 3.26 to 6.76 feet below ground surface. Duplicate sample was collected at MW-1, which is only sampled for lead and geochemical parameters, therefore no duplicate sample was submitted for GRO, DRO, VOC, or PAH analysis during this sample event.

Rebekah Reams

7/12/2021

Document, Report, or Work plan Review - other

2020 Second Semi-Annual Groundwater Monitoring event was conducted on October 23rd & 24th, 2020. Groundwater samples were collected from monitoring wells MW-1 through MW-10. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 4.70 to 7.05 feet below ground surface.

Rebekah Reams

7/12/2021

Document, Report, or Work plan Review - other

2021 First Semi-Annual Groundwater Monitoring event was conducted on May 3rd & 4th, 2021. Groundwater samples were collected from monitoring wells MW-1, MW-3, MW-9 and MW-10. Monitoring wells MW-2, MW-5, and MW-7 were unable to be sampled due to ice obstructions within the well casing. Monitoring wells MW-4, MW-6, and MW-8 did not contain enough water to collect samples. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 3.60 to 6.68 feet below ground surface.

Rebekah Reams

10/14/2021

Update or Other Action

ADEC was notified that this property has transferred from Steve Wuerth to Tony Gatz and Harlia Pace of the Alaska Cycle Center.

Rebekah Reams

3/18/2022

Document, Report, or Work plan Review - other

2021 Second Semi-Annual Groundwater Monitoring event was conducted on October 6th, 2021. Groundwater samples were collected from monitoring wells MW-1 through MW-10. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 4.29 to 6.99 feet below ground surface.

Rebekah Reams

4/6/2022

Document, Report, or Work plan Review - other

DEC provided comments on the Soil Investigation Work Plan. This document details plans to advance four soil borings to further delineate the remaining contamination on the site in the vicinity of the former UST basin and southeast of SB20-3 to confirm remaining contamination is bound to the site.

Rebekah Reams

4/6/2022

Offsite Soil or Groundwater Disposal Approved

DEC approved the transport of 0.25 cubic yards of soil generated during 2021 field activities.

Rebekah Reams

5/4/2022

Document, Report, or Work plan Review - other

DEC approved the Revised Soil Investigation Work Plan submitted May 4, 2022. This document addresses ADEC comments and details plans to advance four soil borings to further delineate the remaining contamination in the vicinity of the former UST basin and southeast of SB20-3 to confirm remaining contamination is bound to the site. Work is scheduled to begin June 1, 2022.

Rebekah Reams

7/8/2022

Long Term Monitoring Workplan or Report Review

2022 First Semi-Annual Groundwater Monitoring event was conducted on April 25, 2022. Groundwater samples were collected from monitoring wells MW-1, MW-6, and MW-10. Monitoring wells MW-2, MW-3, MW-5, MW-7, MW-8, and MW-9 were frozen and unable to gauge or sample. Well MW-4 had insufficient water to sample. Samples were submitted to the analytical laboratory for GRO, DRO, VOCs, PAHs, lead, and geochemical parameters. Groundwater flow direction was to the south-southeast and depth to groundwater was 3.75 to 7.02 feet below ground surface.

Rebekah Reams

9/29/2022

Document, Report, or Work plan Review - other

ADEC provided comments on the Treatment of Purge Water Utilizing Granular Activated Carbon (GAC) at Chevron Environmental Management Company Sites which includes standard operating procedures and breakthrough estimates proposed for use at this site.

Rebekah Reams

10/10/2022

Document, Report, or Work plan Review - other

Subsurface soil investigation work was completed in June 2022 which included the advancement of SB22-6 through SB22-9 to confirm and characterize soil impacts adjacent to the former dispenser islands, the former UST basin, the former used oil UST and at soil boring locations that previously exceeded applicable screening levels. Highest contaminant concentrations detected during this sampling event were along the property boundary near International Airport Road at boring SB22-7. Concentrations of GRO, DRO, BTEX, naphthalene and select additional VOCs and PAHs exceeded cleanup levels during this sampling event.

Rebekah Reams

12/23/2022

Offsite Soil or Groundwater Disposal Approved

DEC approved transport of one 55-gallon drum of purge water for offsite disposal

Rebekah Reams

4/7/2023

Long Term Monitoring Workplan or Report Review

ADEC approved the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum which will update the groundwater monitoring schedule to include a revised analyte list for site wells on a semi-annual basis.

Rebekah Reams

11/29/2023

Site Visit

ADEC staff visited the site to observe current site use, layout, and monitoring well locations.

Rebekah Reams

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

2018 Monitoring Well Installation Report

2018 Second Semi-Annual Groundwater Monitoring Report

2019 Second Semi-Annual Groundwater Monitoring Report

2019 First Semi-Annual Groundwater Monitoring Report

February 21, 2020 ADEC request for release investigation letter

2018 First Semi-Annual Groundwater Monitoring Report

No associated sites were found.

Missing Location Data

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Alaska Department of Environmental Conservation

Site Report: Pineapple's Texaco Station

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

2018 Monitoring Well Installation Report

2018 Second Semi-Annual Groundwater Monitoring Report

2019 Second Semi-Annual Groundwater Monitoring Report

2019 First Semi-Annual Groundwater Monitoring Report

February 21, 2020 ADEC request for release investigation letter

2018 First Semi-Annual Groundwater Monitoring Report

Missing Location Data

State of Alaska Department of Environmental Conservation