Site Report: Texaco - Former -1006 West 5th

Site Name:	Texaco - Former -1006 West 5th
Address:	1006 West 5th Ave., Anchorage, AK 99501
File Number:	2100.26.097
Hazard ID:	23583
Status:	Active
Staff:	Rebekah Reams, 9074512144 rebekah.reams@alaska.gov
Latitude:	61.217368
Longitude:	-149.902167
Horizontal Datum:	NAD83

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

In 1988 soil contaminated with gasoline, diesel, and used oil with PCBs found during the removal of six USTs. Four groundwater monitoring wells were installed (T-1, T-2, T-3, and T-5). An additional soil boring (T-4) was also sampled. In 1989 three monitoring wells were installed (MW-1, MW-2, and MW-3). In 1990 shop floor drain cribs and some associated contaminated soil was removed. In 1992 station building and heating oil tank were removed along with 20 cubic yards of heating oil contaminated soil, which was subsequently treated. Tetrachloroethlene (PCE), Trichloroethlene (TCE), methylene chloride, and benzene contamination in the soil and TCE contamination in the ground water. In 2005 two soil borings and one monitoring well (MW-4) was installed to evaluate current soil and groundwater contamination concentrations in those areas. In 2007 eight soil borings/well points were installed and soil and groundwater samples were collected on a property adjacent and downgradient of the former Texaco Station. Up to 3,700 mg/kg DRO, 92 mg/kg GRO, 0.24 mg/kg PCE, and non-detect benzene and TCE in the soil samples collected. Up to 1.8 mg/l DRO, 4.4 ug/l PCE. non-detect GRO, benzene, and TCE in the groundwater samples collected. The full extent of the contamination in the soil and groundwater has not been defined. DRO and PCE soil contamination appear to extend off property to the northwest. In 2008 three soil borings were drilled off-property just across 5th Avenue in front of the Captain Cook Parking Garage at 420 K Street. The parking garage has two sub-levels to a depth of 20 to 25 feet below ground surface (bgs). Eleven soil samples and three groundwater samples were collected from the borings. Up to 0.18 mg/kg Tetrachloroethene (PCE) and non detect DRO, RRO, GRO, benzene, and Trichloroethene (TCE) in the samples collected. PCE soil contamination over cleanup levels was encountered between 13.5 to 25 feet bgs. Higher soil concentrations may exist since none of the soil samples were collected from the soil/water interface. While the groundwater sample results were below cleanup levels they may be biased low for benzene, GRO, PCE and TCE because a peristaltic pump was used to collect the groundwater samples. Groundwater was encountered between 25.5 and 27 feet below ground surface. In 2009 21 borings were sampled to help define the extent of the remaining BTEX, DRO, and VOC contamination on the Texaco property and the property to the west. Up to 9,220 mg/kg DRO, 0.16 mg/kg methylene chloride, 0.25 mg/kg PCE, and 0.054 mg/kg TCE in the soil samples collected. The highest concentrations were generally at or near the soil/water interface located between 23 to 31 feet below ground surface. All of the samples on the downgradient direction (north and west) exceeded cleanup levels PCE and it appears that the contamination extend off property into West 5th Avenue and L Street and beyond. The one soil boring was drilled across L Street had 0.03 mg/kg PCE. The extent of this contamination has not been defined. Confirmation soil samples were also taken the locations that had exceeded cleanup levels in soil samples collected several years ago. The soil boring near T-5 still had PCE contamination at 0.211 mg/kg, MW-1 at 0.104 mg/kg, and MW-2 at 0.11 mg/kg. The soil sample collected at 10 feet below ground surface near MW-3 met cleanup levels for GRO and DRO. In 2015 soil samples were collected from 6 borings to help assess the current concentrations of PCE in the soil at the northern portion former gas station property. Three borings were sampled to groundwater (25 feet below ground surface (bgs)) along the northern edge of the property, and three to 10 feet bgs near the former used oil tank and other USTs. Up to 0.26 mg/kg PCE in the 27 soil samples and 2 duplicate sample analyzed. Note that only PCE was analyzed in those soil samples, it did not include analysis for TCE or other solvents/breakdown products. Two soil samples (one at 20 feet bgs in soil boring SB-1 and one at 2 feet bgs in soil boring SB-3) and one duplicate were analyzed for PAHs, all were below proposed cleanup levels. The highest field screening location SB-4 at 2 feet bgs did not have PAH analysis. Soil boring SB-3 that had the highest PCE concentration (0.26 mg/kg at 25 ft bgs) had similar PCE concentration to the concentration of PCE in SB09-18 (0.25 mg/kg at 27 ft bgs) in September of 2009, located about 15 feet to the east of SB-3. Need continued groundwater monitoring, soil gas sampling for the nearby off-property buildings, confirmation soil samples, and possible corrective action for site closure.

Action Information

Action Date	Action	Description	DEC Staff
8/1/1988	Update or Other Action	Tank and soil removal by BC Excavating. PCB contamination discovered which complicates soil disposal.	Former Staff
8/19/1988	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77662 Petroleum, solvents, and some polychlorinated biphenyls (PCBs).	Former Staff
8/19/1988	Site Added to Database		Former Staff
8/20/1988	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LCAU Date changed DB conversion	Former Staff
10/15/1988	Underground Storage Tank Site Characterization or Assessment	Reviewed a phase 1 site assessment report.	Former Staff
6/15/1989	Update or Other Action	Majority of contaminants removed, ADEC requested additional monitoring.	Former Staff
7/1/1989	Document, Report, or Work plan Review - other	ENSR, Inc. Environmental assessment report to Texaco; recommended removing sump wastes and hydraulic fluid. PCBs detected (< 1 mg/kg) in Borings B-1 and B-4.	Former Staff
6/5/1990	Leaking Underground Storage Tank Corrective Action Underway	Work plan for removal and disposal of sump wastes. Sump wastes removed 11/90.	Former Staff
1/15/1991	Document, Report, or Work plan Review - other	Texaco sent report along with request for closure at site. ADEC informed Texaco that because contamination remains over cleanup levels the site can not be closed.	Former Staff
6/17/1991	Document, Report, or Work plan Review - other	ENSR sent in groundwater monitoring results for site. Static water level surveys were conducted in June, July & August with groundwater flow to NW.	Former Staff
8/14/1992	Update or Other Action	ADEC approval to Anita Burke (TEXACO) and her consultant of their proposal to treat 30 yards of soil at ASR (thermal remediation), and to pave site. They were also told to prepare information updating the configuration of the solvent plume beneath the site, and to predict where it may be headed.	Former Staff
10/20/1992	Document, Report, or Work plan Review - other	Reviewed a phase 2 site assessment report.	Former Staff
1/21/1993	Document, Report, or Work plan Review - other	Demolished building, removed piping and HHO tank. Approximately 20 cy of contaminated soil was excavated and thermally treated at ASR. Site now a parking lot.	Former Staff
11/20/1997	Update or Other Action	ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TEXACO REFINING & MARKETING INC.	Former Staff
7/26/2000	Update or Other Action	ADEC requests results of DRO/RRO groundwater sampling.	Robert Weimer
12/2/2003	Update or Other Action	Approved reduction in groundwater monitoring at the site.	Robert Weimer
8/10/2004	Document, Report, or Work plan Review - other	June 6, 2004 sampling of the groundwater. Up to 9 ug/l tetrachloroethene. Contamination levels have increased some since 1999.	Robert Weimer
11/24/2004	Document, Report, or Work plan Review - other	September 25, 2004 sampling of the groundwater. Up to 12 ug/l tetrachloroethene. Contamination levels have increased some since 1999.	Robert Weimer
2/23/2005	Update or Other Action	Meeting with RP's new consultant to discuss site. Suspend sampling of monitoring well MW-B for BTEX. May reduce other monitoring wells after reviewing December 2004 groundwater sampling data.	Robert Weimer
3/9/2005	Update or Other Action	ADEC approved the following reduction in groundwater monitoring at the site: Suspend MW-B BTEX sampling.	Robert Weimer
5/23/2005	Update or Other Action	Reviewed and approved addendum to workplan for confirmation closure sampling at the site. The plan calls for the soil sampling near MW-1, MW-2, and MW-3, and the soil and water sampling near T-5.	Robert Weimer
7/6/2005	Document, Report, or Work plan Review - other	May 14, 2005 sampling of the groundwater. Up to 10 ug/l tetrachloroethene. Contamination levels have increased some since 1999.	Robert Weimer
9/1/2005	Update or Other Action	Reviewed and approved the thermal treatment of 4 drums of drill cuttings at ASR. Also 1 drum of purge water to Emerald Alaska for treatment.	Robert Weimer
10/10/2005	Document, Report, or Work plan Review - other	Reviewed and approved treatment of 20 gallons of contaminated purge water.	Robert Weimer
11/1/2005	Update or Other Action	Received receipts for the treatment of the two drums of purged groundwater.	Robert Weimer
11/1/2005	Document, Report, or Work plan Review - other	On July 20, 2005 two soil borings and one monitoring well were installed to evaluate current soil and groundwater contamination levels. The detection limits were above cleanup levels in every sample for benzene, methylene chloride, and tetrachloroethene. The contamination could be up to 0.058 mg/kg benzene, 0.98 mg/kg methylene chloride, and 0.099 mg/kg tetrachloroethene. Up to 5.7 mg/kg GRO, 60 mg/kg DRO, .031 mg/kg benzene, 0.27 mg/kg methylene chloride, and .037 mg/kg tetrachloroethene were detected in the soil.	Robert Weimer
11/18/2005	Document, Report, or Work plan Review - other	September 24, 2005 sampling of the groundwater. Up to 25 ug/l tetrachloroethene. Contamination levels have increased some since 1999. Depth to groundwater was around 24 feet below ground surface. Groundwater flow direction is generally to the northwest.	Robert Weimer
12/6/2005	Document, Report, or Work plan Review - other	Reviewed corrective action report for the thermal treatment of 4 drums of contaminated soil.	Robert Weimer
7/14/2006	Document, Report, or Work plan Review - other	May 14, 2006 sampling of the groundwater. Up to 10 ug/l tetrachloroethene. Contamination levels appear to be decreasing. Depth to groundwater was 24 to 25 feet below ground surface. Groundwater flow direction is generally to the northwest.	Robert Weimer
11/1/2006	Update or Other Action	ADEC approves treatment of contaminated purge water.	Robert Weimer
2/8/2007	Document, Report, or Work plan Review - other	September 24, 2006 sampling of the groundwater. Up to 8 ug/l tetrachloroethene. Contamination levels appear to be decreasing. Depth to groundwater was 24 to 25 feet below ground surface. Groundwater flow direction is generally to the northwest.	Robert Weimer
2/28/2007	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.	Robert Weimer
4/2/2007	Update or Other Action	Meeting with RP to discuss site. Approved suspending sampling of monitoring wells T-1, T-2, and T-3. They are to continue to monitor the groundwater at the site and to collect confirmation soil samples when groundwater meets cleanup levels.	Robert Weimer
8/3/2007	Document, Report, or Work plan Review - other	ADEC approves treatment of contaminated purge water.	Robert Weimer
3/12/2008	Update or Other Action	Call from north parking lot lessees consultant. They did a phase 2 assessment with 8 borings that they collected soil and groundwater contamination. They identified solvent and petroleum contamination in the soil and groundwater. They will be forwarding a copy of the report to ADEC.	Robert Weimer
3/25/2008	Document, Report, or Work plan Review - other	ADEC review of October 31, 2007 Phase II assessment report. 8 soil borings/well points were installed and soil and groundwater samples were collected on a property adjacent and downgradient of the former Texaco Station. Up to 3,700 mg/kg DRO, 92 mg/kg GRO, 0.24 mg/kg PCE, non-detect benzene, and non-detect (<0.03 mg/kg) TCE in the soil samples collected. Up to 1.8 mg/l DRO, non-detect GRO, non-detect benzene, non-detect TCE, and 4.4 ug/l PCE in the groundwater samples collected. The full extent of the contamination in the soil and groundwater has not been defined. DRO and PCE soil contamination appear to extend off property to the northwest.	Robert Weimer
3/28/2008	Update or Other Action	Meeting with RP's consultant to discuss future work at this site. They will provide a plan to conduct additional assessment of the downgradient property. They will also research past use of the property.	Robert Weimer
8/4/2008	Document, Report, or Work plan Review - other	ADEC approves treatment of contaminated purge water.	Robert Weimer
8/28/2008	Update or Other Action	Talked with downgradient property owners consultant. They have done some additional soil and groundwater assessment. They plan to submit the results along with a corrective action plan for the contaminated soil and groundwater on their property.	Robert Weimer
9/25/2008	Document, Report, or Work plan Review - other	ADEC approves treatment of contaminated purge water.	Robert Weimer
10/2/2008	Update or Other Action	Talked with downgradient property owners consultant. They have done some additional shallow soil assessment. They plan to submit the results along with a plan for installing 5 shallow monitoring wells and 5 deep monitoring wells to try to define the extent of the LNAPL and DNAPL groundwater contamination on their property. They plan to drill the wells later in October 2008.	Robert Weimer
10/23/2008	Meeting or Teleconference Held	Talked with downgradient property owners consultant. They plan to install 5 shallow monitoring wells and 5 deep monitoring wells to try to define the extent of the LNAPL and DNAPL groundwater contamination on their property. They plan to drill the wells the week of October 27-31, 2008.	Robert Weimer
12/12/2008	Document, Report, or Work plan Review - other	May 3, 2008 sampling of the groundwater. Up to 4.65 ug/l tetrachloroethene (PCE), 3.58 ug/l trichloroethene (TCE), 1.64 ug/l cholorform, and non-detect benzene. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Depth to groundwater was 24.75 to 26.55 feet below ground surface. Groundwater flow direction was to the northwest.	Robert Weimer
12/30/2008	Meeting or Teleconference Held	Talked with downgradient property owners consultant. They have done some additional soil and groundwater assessment in October 2008. They plan to submit the results for the contaminated soil and groundwater assessment on their property and submit a request for the disposal/treatment of the 10 super sacks + 1 drum of contaminated soil (6.6 mg/kg metheylene chloride) and the 2 drums of contaminated purge/decon water. Soils appear to meet Anchorage Regional Landfill levels.	Robert Weimer
1/16/2009	Document, Report, or Work plan Review - other	Review and approve treatment of 11 cubic yards of contaminated drill cuttings and 110 gallons of contaminated purge water generated during the installation of soil borings and monitoring wells on the adjacent downgradient property.	Robert Weimer
2/25/2009	Meeting or Teleconference Held	Meeting with Chevron and their consultants. ADEC is to send a letter to Chevron requesting groundwater monitoring and a supplemental site assessment release investigation workplan for the off property contamination. They are to conduct an evaluation of indoor air at this site.	Robert Weimer
4/28/2009	Update or Other Action	ADEC letter to Chevron requesting groundwater monitoring in 2009 for DRO and HVOCs in all of the monitoring wells at 501 L Street, release investigation workplan by August 1, 2009, indoor air evaluation and recommendations by August 1, 2009, and conceptual site model by August 1, 2009.	Robert Weimer
6/8/2009	Update or Other Action	Approve request to store 1 drum of purgewater at the secure area at the 1414 C Street site.	Robert Weimer
7/24/2009	Update or Other Action	Discuss site with RP's consultant. Review and approve request for extension for submitting CSM and vapor intrusion evaluation from August 1, 2009 to September 1, 2009.	Robert Weimer
8/25/2009	Update or Other Action	ADEC approves suspending, until further notice, the sampling of monitoring wells MW-1, MW-3, MW-B, T-1, T-2, and T-3 for BTEX as requested. ADEC requests that monitoring well MW-4 continue to be sampled for BTEX on an annual basis because it is located at and near where past benzene soil contamination was identified a remaining (October 20, 2005 report).	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	Update or Other Action	Discussed site workplan with Texaco's consultant. They will move one soil boring to near MW-1. They will move one soil boring to between MW-2 and CB-2. They will add one soil boring near T-5. They will move one soil boring from the south of the adjacent property to just north of the Caribou Inn. The Caribou Inn is to be demolished soon.	Robert Weimer
9/21/2009	Document, Report, or Work plan Review - other	Review and approve request for an extension, due to changes in site conditions (removal of Caribou Inn and the collecting of additoinal soil and groundwater data) to November 30, 2009 to submit a Vapor Intrusion Evaluation Report.	Robert Weimer
11/2/2009	Meeting or Teleconference Held	Discussed the proposed sampling of the 13 super sacks that contain drill cuttings and vac-truck shallow soils. Need minimum of 1 field screening sample per super sack. Can group super sacks and collect 1 analytical sample per group if group is less than 10 cubic yards total. Super sacks are currently stored at the 15th & C Street secure yard.	Robert Weimer
11/2/2009	Update or Other Action	Review of June 16, 2009 CRA response to EMS reports. CRA recommends additional assessment to the southeast and southwest of boring B4.	Robert Weimer
11/2/2009	Document, Report, or Work plan Review - other	June 17, 2009 sampling of the groundwater. Up to 4.0 ug/l tetrachloroethene (PCE), 3.0 ug/l trichloroethene (TCE), non-detect GRO, 0.42 mg/l DRO, and non-detect benzene in the groundwater samples collected. Contamination concentrations increased in 1 of the 16 monitoring wells sampled. Depth to groundwater was 25.21 to 27.38 feet below ground surface. Groundwater flow direction was to the northwest.	Robert Weimer
11/5/2009	Document, Report, or Work plan Review - other	ADEC approves treatment of contaminated purge water.	Robert Weimer
11/6/2009	Update or Other Action	Review September 2009 Preliminary Conceptual Site Model. Proposed compounds of concern DRO, benzene, PCE, lead, and arsenic. Potential pathways identified are soil ingestion and dermal contact, groundwater ingestion, inhalation of outdoor air, sediment contact, and ingestion of wild foods.	Robert Weimer
11/12/2009	Site Visit	At the request of the project manager, the quality assurance officer was onsite at 1441 C Street to observe soil sampling of stockpiled soils originating form the 5th and L street location. CRA samplers Susan Lear and Nicole Taylor were onsite to perform the soil sampling. Brent Porter, CSP QAO, was onsite to document the efforts. A site report with phtographs have been placed in the the QA and working file.	Brenton Porter
2/23/2010	Document, Report, or Work plan Review - other	September 19, 2009 sampling of the groundwater. Up to 3.43 ug/l tetrachloroethene (PCE), 3.12 ug/l trichloroethene (TCE), 0.251 mg/l DRO, and non-detect benzene in the groundwater samples collected. Contamination concentrations increased in 11 of the 17 monitoring wells sampled. Depth to groundwater was 25.17 to 27.40 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.	Robert Weimer
4/8/2010	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 being more than 30 feet away from the remaining soil and groundwater contamination at this site. The site is currently used as a parking lot.	Robert Weimer
5/20/2010	Update or Other Action	Approved, until further notice, no-purge groundwater sampling at this site.	Robert Weimer
6/2/2010	Update or Other Action	Discussed groundwater sampling with Texaco's consultant. They will add PAH analysis to the historic highest DRO monitoring well during the next monitoring event.	Robert Weimer
6/17/2010	Site Visit	Site visit to observe collection of groundwater samples using hydra sleeve sampling gear.	Brenton Porter
6/21/2010	Site Visit	Site visit to observe location of previously missing groundwater monitoring wells and collection of groundwater samples.	Brenton Porter
7/2/2010	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for thermal treatment of 14 supersacks of contaminated drill cuttings.	Robert Weimer
1/21/2011	Document, Report, or Work plan Review - other	Reviewed June 2010 Subsurface Investigation Report. The report documented soil sampling that was conducted on September/October of 2009. 21 borings were sampled to help define the extent of the remaining BTEX, DRO, and VOC contamination on the Texaco property and the property to the west. Up to 9,220 mg/kg DRO, 0.16 mg/kg methylene chloride, 0.25 mg/kg PCE, and 0.054 mg/kg TCE in the soil samples collected. The highest concentrations were generally at or near the soil/water interface located between 23 to 31 feet below ground surface. All of the samples on the downgradient direction (north and west) exceeded cleanup levels PCE and it appears that the contamination extend off property into West 5th Avenue and L Street and beyond. The one soil boring was drilled across L Street had 0.03 mg/kg PCE. The extent of this contamination has not been defined. Confirmation soil samples were also taken the locations that had exceeded cleanup levels in soil samples collected several years ago. The soil boring near T-5 still had PCE contamination at 0.211 mg/kg, MW-1 at 0.104 mg/kg, and MW-2 at 0.11 mg/kg. The soil sample collected at 10 feet below ground surface near MW-3 met cleanup levels for GRO and DRO.	Robert Weimer
1/25/2011	Document, Report, or Work plan Review - other	June 17-21, 2010 sampling of the groundwater. Up to 3.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 0.11 mg/l DRO, and non-detect benzene. One monitoring well (DP-5S) was sampled for PAH's with Napthalene the only detectable compound at 0.000027 mg/l. Contamination levels increased in 1 of the 11 monitoring wells sampled. Depth to groundwater was 25.72 to 27.67 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.	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
7/26/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
11/21/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves treatment of contaminated purge water.	Robert Weimer
12/6/2011	Document, Report, or Work plan Review - other	May 24, 2011 sampling of the groundwater. Up to 4.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 0.94 mg/l DRO, and non-detect benzene. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Depth to groundwater was 25.85 to 27.83 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.	Robert Weimer
3/7/2012	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/28/12. Chevron will submit a workplan for collecting soil vapor samples to assess for potential solvent vapor intrusion into nearby buildings. Additional release investigation may be required to define the off property DRO and PCE contamination. They are to continue semi-annual groundwater monitoring.	Robert Weimer
4/4/2012	Document, Report, or Work plan Review - other	On May 17, 2008 three soil borings were drilled off-property just across 5th Avenue in front of the Captain Cook Parking Garage at 420 K Street. The parking garage has two sub-levels to a depth of 20 to 25 feet below ground surface (bgs). Eleven soil samples and three groundwater samples were collected from the borings. Up to 0.18 mg/kg Tetrachloroethene (PCE) and non detect DRO, RRO, GRO, benzene, and (0.03 mg/kg detection limit) Trichloroethene (TCE) in the soil. PCE soil contamination was encountered between 13.5 to 25 feet bgs. Higher soil concentrations may exist since none of the soil samples were collected from the soil/water interface. Up to 0.26 mg/l DRO, non-detect RRO, non-detect GRO, non-detect benzene, 0.0014 mg/l TCE, and non-detect PCE in the groundwater samples collected. The groundwater sample results may be biased low for benzene, GRO, PCE and TCE because a peristaltic pump was used to collect the groundwater samples. Groundwater was encountered between 25.5 and 27 feet below ground surface.	Robert Weimer
8/17/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves offsite treatment of contaminated purge water.	Robert Weimer
10/11/2012	Document, Report, or Work plan Review - other	May 23, 2012 sampling of the groundwater. Up to 5.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 0.87 mg/l DRO, and non-detect benzene. Contamination concentrations increased in 5 of the 6 monitoring wells sampled. Depth to groundwater was 25.62 to 27.51 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.	Robert Weimer
11/2/2012	Document, Report, or Work plan Review - other	ADEC provided the following comments on the Vapor Intrusion Assessment Work Plan:1. We need completed Building Survey and Indoor Air Sampling Questionnaire’s form item #5 (Basement And Construction Characteristics) for each building. This information is important to determine the location, number, and depths of the soil gas probes. Note that some buildings may have basements or deeper areas only on portions of the building. 2. One liter suma canisters are requested. 3. A “shut in” test in addition to the tracer leak detection is requested. 4. The use of a helium detector on-site to test for leaks before the samples are collected is requested. 5. The building across the intersection to the northwest will also need vapor probes.	Robert Weimer
11/2/2012	Document, Report, or Work plan Review - other	July 30, 2012 sampling of the groundwater. Up to 6.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 1.5 mg/l DRO, and non-detect benzene in the groundwater samples collected. Contamination concentrations increased in 2 of the 11 monitoring wells sampled. Depth to groundwater was 25.41 to 27.45 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.	Robert Weimer
2/8/2013	Update or Other Action	Reviewing request for reduction in groundwater monitoring. Requested information from consultant regarding what interval was sampled in each monitoring well during the 7/30/12 monitoring event.	Robert Weimer
2/11/2013	Update or Other Action	DEC review of request for reduction in groundwater monitoring at this site. DEC requested that the next monitoring event that all of the monitoring wells are purged prior to sampling. DEC also requested that the deep wells have the samples collected within the deeper screened interval of 30 to 40 feet below ground surface.	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 semi-annual groundwater monitoring to monitor for natural attenuation and trends, and a vapor intrusion work plan. We also discussed that soil gas probes won’t be needed for the above ground bike rental shed, and they need to sample within the screened interval of the deep monitoring wells (that depth based on soil stratigraphy and contamination depth. 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
3/28/2013	Site Visit	Site visit to observe current site conditions.	Robert Weimer
6/14/2013	Update or Other Action	DEC requests that a well point screened at 5 feet bgs and another screened 10 feet bgs for each location for slab on grade buildings.	Robert Weimer
1/14/2014	Document, Report, or Work plan Review - other	May 2, 2013 sampling of the groundwater. Up to 12.0 ug/l tetrachloroethene (PCE), 0.5 ug/l trichloroethene (TCE), and 0.57 mg/l DRO. Contamination concentrations increased in 5 of the 13 monitoring wells sampled. Depth to groundwater was 25.06 to 26.72 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by both no purge (Hydrasleeve) and purge (bladder pump). The Hydrasleeve samples were collected from the top of the water column in each monitoring well. The depth of sampling with the bladder pump was not documented.	Robert Weimer
2/12/2014	Document, Report, or Work plan Review - other	September 13-14, 2013 sampling of the groundwater. Up to 6.7 ug/l tetrachloroethene (PCE), 2.1 ug/l trichloroethene (TCE), and 1.3 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 6 of the 13 monitoring wells sampled. Depth to groundwater was 23.52 to 25.66 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by no purge (Hydrasleeve). The Hydrasleeve samples were collected from the top of the water column in the shallow monitoring wells and at the bottom of the water column in the deep monitoring wells.	Robert Weimer
2/27/2014	Meeting or Teleconference Held	Meeting with Chevron and their consultants on 2/27/2014. They plan to continue semi-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. They submit a work plan for soil gas sampling event to help evaluated the vapor intrusion pathway, they will also look to see if the building has an elevator shaft. In the future they will need to evaluate for a diving plume on the monitoring wells far from the release point. Chevron will submit a work plan for the monitoring well sampling including the top and bottom of the water column, but depending on the length of water in the monitoring well and boring log they may need to sample more than just the top and bottom. They plan to look for a off-property source for the solvent contamination. 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.	Robert Weimer
1/28/2015	Document, Report, or Work plan Review - other	May 7, 2014 sampling of the groundwater. Up to 7.4 ug/l tetrachloroethene (PCE), 0.48 ug/l trichloroethene (TCE), and 0.8 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 3 of the 13 monitoring wells sampled. Depth to groundwater was 24.62 to 26.94 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by no purge (Hydrasleeve) and purge (low flow). Because most of the Hydrasleeve and low flow samples were not collected from the top of the water column in the shallow monitoring wells and at the bottom of the water column in the deep monitoring wells as required the samples are considered biased low.	Robert Weimer
5/26/2015	Document, Report, or Work plan Review - other	October 4, 2014 sampling of the groundwater. Up to 3.8 ug/l (5 ug/l cleanup level) tetrachloroethene (PCE), 0.37 ug/l trichloroethene (TCE), 0.25 ug/l benzene, and 0.16 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 13 of the 13 monitoring wells sampled. Depth to groundwater was 24.49 to 26.68 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by purge using a bladder pump. 8 of the 10 samples were not collected from the top of the water column in the shallow monitoring wells (only monitoring wells T-2 and T-3 were sampled at the required interval) and at the bottom of the water column in the deep monitoring wells as required the samples are considered biased low and can't be used to define the extent of contamination or trends.	Robert Weimer
6/5/2015	Offsite Soil or Groundwater Disposal Approved	ADEC approves temporary storage of drums of soil cuttings and purge water at the secure area at 1441 C Street.	Robert Weimer
9/28/2015	Conceptual Site Model Submitted	Conceptual Site Model submitted. It identified completed pathways for soil and groundwater ingestion, soil dermal absorption, inhalation of outdoor and indoor air.	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
2/3/2016	Offsite Soil or Groundwater Disposal Approved	DEC approves of request to dispose of 1 drum of contaminated drill cuttings at WMI's Arlington Landfill. The drill cuttings were generated during the June 12, 2015 release investigation work.	Robert Weimer
4/22/2016	Document, Report, or Work plan Review - other	May 2, 2015 sampling of the groundwater. Up to 5.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE) and benzene, and 0.17 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 6 of the 11 monitoring wells sampled. Depth to groundwater was 25.23 to 27.27 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected without purging using a HydraSleeve for volatiles and bailers for non-volatiles.	Robert Weimer
8/15/2016	Document, Report, or Work plan Review - other	On June 4-5, 2015 soil samples were collected from 6 borings to help assess the current concentrations of PCE in the soil at the northern portion former gas station property. Three borings were sampled to groundwater (25 feet below ground surface (bgs)) along the northern edge of the property, and three to 10 feet bgs near the former used oil tank and other USTs. Up to 0.26 mg/kg PCE in the 27 soil samples and 2 duplicate sample analyzed. Note that only PCE was analyzed in those soil samples, it did not include analysis for TCE or other solvents/breakdown products. Two soil samples (one at 20 feet bgs in soil boring SB-1 and one at 2 feet bgs in soil boring SB-3) and one duplicate were analyzed for PAHs, all were below proposed cleanup levels. The highest field screening location SB-4 at 2 feet bgs did not have PAH analysis. Soil boring SB-3 that had the highest PCE concentration (0.26 mg/kg at 25 ft bgs) had similar PCE concentration to the concentration of PCE in SB09-18 (0.25 mg/kg at 27 ft bgs) in September of 2009, located about 15 feet to the east of SB-3.	Robert Weimer
8/18/2016	Document, Report, or Work plan Review - other	November 2-3, 2015 sampling of the groundwater. Up to 11 ug/l tetrachloroethene (PCE), 0.5 ug/l trichloroethene (TCE), non-detect benzene, and 0.73 mg/l DRO. Contamination concentrations increased in 8 of the 12 monitoring wells sampled. Depth to groundwater was 24.87 to 26.93 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected without purging using a HydraSleeve for volatiles and bailers for non-volatiles. The depth of the hydrasleeve sampling was not documented in the field notes for DP-4D and DP-5D so those results may be biased low. DP-3D Hydrasleeve sampling was not collected at the deeper interval as required so its results are considered biased low. The DRO samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.	Robert Weimer
8/26/2016	Update or Other Action	ADEC requests that the site sampling for VOCs continue until it is demonstrated to be caused by a another specific source. This would entail the collection (in accordance with an ADEC approved work plan) of soil and groundwater samples near the specific source and between the source and this site. ADEC noted that there have been problems with the interval sampled in the deep monitoring wells (DP-3D, DP-4D, and DP-5D). ADEC requests a work plan be submitted by October 1, 2016 for the groundwater monitoring at this site, that includes details on the method of sampling collection, analysis, and sampling frequency. ADEC requests that future groundwater monitoring be conducted by purge method, using a device such as an in-well or bladder pump that minimizes the loss of volatiles. ADEC also requests that the next monitoring event include PAH analysis in monitoring wells T-1, T-2, T-3, MW-2 (if it has sufficient water to sample), D-P3S, DP-3D, DP-5S, and DP-5D.	Robert Weimer
2/28/2017	Document, Report, or Work plan Review - other	June 21-22, 2016 sampling of the groundwater. Up to 5 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), non-detect benzene, and 0.24 mg/l DRO. Contamination concentrations increased in 2 of the 13 monitoring wells sampled. Depth to groundwater was 25.35 to 27.36 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected without purging using a HydraSleeve for volatiles and bailers for non-volatiles. DP-3D Hydrasleeve sampling was not collected at the deeper interval as required so its results are considered biased low. The DRO samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.	Robert Weimer
3/23/2017	Document, Report, or Work plan Review - other	DEC conditionally approves the February 27, 2017 monitoring well installation work plan. The work plan proposes to install two monitoring wells (one at the northwest corner of 6th and K Street and the other on 7th Avenue to the northwest of the American Linen Cleaners building) and collect soil and groundwater samples at those locations.	Robert Weimer
10/20/2017	Document, Report, or Work plan Review - other	May 30-31, 2017 sampling of the groundwater. Up to 5 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), 2.0 ug/l Chloroform, non-detect benzene, and non-detect DRO. Contamination concentrations increased in 3 of the 12 monitoring wells sampled. Depth to groundwater was 25.21 to 27.22 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected after purging using a bladder pump. Since the samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.	Robert Weimer
2/21/2018	Document, Report, or Work plan Review - other	August 8-9, 2017 sampling of the groundwater. Up to 4 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), 1.0 ug/l Chloroform, non-detect benzene, and non-detect DRO. Contamination concentrations increased in 3 of the 15 monitoring wells sampled. Depth to groundwater was 18.45 to 27.83 feet below ground surface. Groundwater flow direction was to the west. Samples were collected after purging using a bladder pump. Since the samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.	Robert Weimer
6/20/2018	Offsite Soil or Groundwater Disposal Approved	DEC approves of request to transport and treat of 1 drum of contaminated purge water and 1.3 cubic yards of contaminated drill cuttings at Clean Harbors Aragonite Incineration Facility in Utah. The purge water and drill cuttings were generated during the June/July 2017 release investigation work.	Robert Weimer
11/5/2018	Document, Report, or Work plan Review - other	On June 28, 2017 two soil borings were sampled and completed as monitoring wells (MW-5 and MW-6). These monitoring wells were installed up gradient of the 1006 West 5th Avenue property to help assess the potential impact of an up gradient dry cleaner site. The soil samples collected had up to 0.0046 mg/kg acenaphthylene (18 mg/kg 2016 cleanup level), 0.00086 mg/kg anthracene (390 mg/kg 2016 cleanup level), 0.0016 mg/kg chrysene (82 mg/kg 2016 cleanup level), 0.00088 mg/kg fluoranthene (36 mg/kg 2016 cleanup level), 0.0089 mg/kg phenanthrene (39 mg/kg 2016 cleanup level), 0.0013 mg/kg pyrene (87 mg/kg 2016 cleanup level), 0.0074 mg/kg naphthalene (0.038 mg/kg 2016 cleanup level), and 0.33 mg/kg tetrachloroethylene (PCE) (0.19 mg/kg 2016 cleanup level) in MW-6 which was located closer to the dry cleaner site. Samples over PCE cleanup levels were found at 10 feet below ground surface (bgs) and 22.5 feet bgs. The soil samples were analyzed for VOC(PCE only) and PAHs. Groundwater was encountered a 21 feet bgs in MW-5 and 23 feet bgs in MW-6.	Robert Weimer
1/17/2019	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77662 solvents.	Robert Weimer
6/6/2019	Document, Report, or Work plan Review - other	May 14-16, 2018 sampling of the groundwater. Up to 3 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), 2.0 ug/l Chloroform, non-detect benzene, EDB and 1,2-DCA, and 0.97 mg/l DRO. Contamination concentrations increased in 4 of the 14 monitoring wells sampled. Depth to groundwater was 21.57 to 27.01 feet below ground surface. Groundwater flow direction was to the west. Samples were collected after purging using a bladder pump. Since the samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low. The deeper screened interval is 30 to 40 feet below ground surface.	Robert Weimer
8/1/2019	Document, Report, or Work plan Review - other	October 8-9, 2018 sampling of the groundwater. Up to 6 ug/l tetrachloroethene (PCE), 0.3 ug/l trichloroethene (TCE), 2.0 ug/l Chloroform, non-detect benzene, EDB and 1,2-DCA, and 0.46 mg/l DRO. Contamination concentrations increased in 3 of the 13 monitoring wells sampled. Depth to groundwater was 23.59 to 27.04 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected after purging using a bladder pump. The deeper monitoring wells were sampled from their screened interval.	Robert Weimer
9/23/2019	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 VOC sampling needs to include the full 8260 VOC list including naphthalene.	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 unless the well screened interval is deeper, then in that case from the top foot of that screened interval. Also all HVOC 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.	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.	Robert Weimer
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
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
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
4/3/2023	Long Term Monitoring Workplan or Report Review	ADEC provided comments on the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum which proposes to update the groundwater monitoring schedule to include a revised analyte list for semi-annual monitoring at site wells DP-3D, DP-3S, DP-4D, DP-4S, DP-5D, DP-5S, MW-A, MW-B, MW-1 through MW-6, and T-1 through T-3.	Rebekah Reams

Action Date

Action

Description

DEC Staff

8/1/1988

Update or Other Action

Tank and soil removal by BC Excavating. PCB contamination discovered which complicates soil disposal.

Former Staff

8/19/1988

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77662 Petroleum, solvents, and some polychlorinated biphenyls (PCBs).

Former Staff

8/19/1988

Site Added to Database

Former Staff

8/20/1988

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU Date changed DB conversion

Former Staff

10/15/1988

Underground Storage Tank Site Characterization or Assessment

Reviewed a phase 1 site assessment report.

Former Staff

6/15/1989

Update or Other Action

Majority of contaminants removed, ADEC requested additional monitoring.

Former Staff

7/1/1989

Document, Report, or Work plan Review - other

ENSR, Inc. Environmental assessment report to Texaco; recommended removing sump wastes and hydraulic fluid. PCBs detected (< 1 mg/kg) in Borings B-1 and B-4.

Former Staff

6/5/1990

Leaking Underground Storage Tank Corrective Action Underway

Work plan for removal and disposal of sump wastes. Sump wastes removed 11/90.

Former Staff

1/15/1991

Document, Report, or Work plan Review - other

Texaco sent report along with request for closure at site. ADEC informed Texaco that because contamination remains over cleanup levels the site can not be closed.

Former Staff

6/17/1991

Document, Report, or Work plan Review - other

ENSR sent in groundwater monitoring results for site. Static water level surveys were conducted in June, July & August with groundwater flow to NW.

Former Staff

8/14/1992

Update or Other Action

ADEC approval to Anita Burke (TEXACO) and her consultant of their proposal to treat 30 yards of soil at ASR (thermal remediation), and to pave site. They were also told to prepare information updating the configuration of the solvent plume beneath the site, and to predict where it may be headed.

Former Staff

10/20/1992

Document, Report, or Work plan Review - other

Reviewed a phase 2 site assessment report.

Former Staff

1/21/1993

Document, Report, or Work plan Review - other

Demolished building, removed piping and HHO tank. Approximately 20 cy of contaminated soil was excavated and thermally treated at ASR. Site now a parking lot.

Former Staff

11/20/1997

Update or Other Action

ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TEXACO REFINING & MARKETING INC.

Former Staff

7/26/2000

Update or Other Action

ADEC requests results of DRO/RRO groundwater sampling.

Robert Weimer

12/2/2003

Update or Other Action

Approved reduction in groundwater monitoring at the site.

Robert Weimer

8/10/2004

Document, Report, or Work plan Review - other

June 6, 2004 sampling of the groundwater. Up to 9 ug/l tetrachloroethene. Contamination levels have increased some since 1999.

Robert Weimer

11/24/2004

Document, Report, or Work plan Review - other

September 25, 2004 sampling of the groundwater. Up to 12 ug/l tetrachloroethene. Contamination levels have increased some since 1999.

Robert Weimer

2/23/2005

Update or Other Action

Meeting with RP's new consultant to discuss site. Suspend sampling of monitoring well MW-B for BTEX. May reduce other monitoring wells after reviewing December 2004 groundwater sampling data.

Robert Weimer

3/9/2005

Update or Other Action

ADEC approved the following reduction in groundwater monitoring at the site: Suspend MW-B BTEX sampling.

Robert Weimer

5/23/2005

Update or Other Action

Reviewed and approved addendum to workplan for confirmation closure sampling at the site. The plan calls for the soil sampling near MW-1, MW-2, and MW-3, and the soil and water sampling near T-5.

Robert Weimer

7/6/2005

Document, Report, or Work plan Review - other

May 14, 2005 sampling of the groundwater. Up to 10 ug/l tetrachloroethene. Contamination levels have increased some since 1999.

Robert Weimer

9/1/2005

Update or Other Action

Reviewed and approved the thermal treatment of 4 drums of drill cuttings at ASR. Also 1 drum of purge water to Emerald Alaska for treatment.

Robert Weimer

10/10/2005

Document, Report, or Work plan Review - other

Reviewed and approved treatment of 20 gallons of contaminated purge water.

Robert Weimer

11/1/2005

Update or Other Action

Received receipts for the treatment of the two drums of purged groundwater.

Robert Weimer

11/1/2005

Document, Report, or Work plan Review - other

On July 20, 2005 two soil borings and one monitoring well were installed to evaluate current soil and groundwater contamination levels. The detection limits were above cleanup levels in every sample for benzene, methylene chloride, and tetrachloroethene. The contamination could be up to 0.058 mg/kg benzene, 0.98 mg/kg methylene chloride, and 0.099 mg/kg tetrachloroethene. Up to 5.7 mg/kg GRO, 60 mg/kg DRO, .031 mg/kg benzene, 0.27 mg/kg methylene chloride, and .037 mg/kg tetrachloroethene were detected in the soil.

Robert Weimer

11/18/2005

Document, Report, or Work plan Review - other

September 24, 2005 sampling of the groundwater. Up to 25 ug/l tetrachloroethene. Contamination levels have increased some since 1999. Depth to groundwater was around 24 feet below ground surface. Groundwater flow direction is generally to the northwest.

Robert Weimer

12/6/2005

Document, Report, or Work plan Review - other

Reviewed corrective action report for the thermal treatment of 4 drums of contaminated soil.

Robert Weimer

7/14/2006

Document, Report, or Work plan Review - other

May 14, 2006 sampling of the groundwater. Up to 10 ug/l tetrachloroethene. Contamination levels appear to be decreasing. Depth to groundwater was 24 to 25 feet below ground surface. Groundwater flow direction is generally to the northwest.

Robert Weimer

11/1/2006

Update or Other Action

ADEC approves treatment of contaminated purge water.

Robert Weimer

2/8/2007

Document, Report, or Work plan Review - other

September 24, 2006 sampling of the groundwater. Up to 8 ug/l tetrachloroethene. Contamination levels appear to be decreasing. Depth to groundwater was 24 to 25 feet below ground surface. Groundwater flow direction is generally to the northwest.

Robert Weimer

2/28/2007

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.

Robert Weimer

4/2/2007

Update or Other Action

Meeting with RP to discuss site. Approved suspending sampling of monitoring wells T-1, T-2, and T-3. They are to continue to monitor the groundwater at the site and to collect confirmation soil samples when groundwater meets cleanup levels.

Robert Weimer

8/3/2007

Document, Report, or Work plan Review - other

ADEC approves treatment of contaminated purge water.

Robert Weimer

3/12/2008

Update or Other Action

Call from north parking lot lessees consultant. They did a phase 2 assessment with 8 borings that they collected soil and groundwater contamination. They identified solvent and petroleum contamination in the soil and groundwater. They will be forwarding a copy of the report to ADEC.

Robert Weimer

3/25/2008

Document, Report, or Work plan Review - other

ADEC review of October 31, 2007 Phase II assessment report. 8 soil borings/well points were installed and soil and groundwater samples were collected on a property adjacent and downgradient of the former Texaco Station. Up to 3,700 mg/kg DRO, 92 mg/kg GRO, 0.24 mg/kg PCE, non-detect benzene, and non-detect (<0.03 mg/kg) TCE in the soil samples collected. Up to 1.8 mg/l DRO, non-detect GRO, non-detect benzene, non-detect TCE, and 4.4 ug/l PCE in the groundwater samples collected. The full extent of the contamination in the soil and groundwater has not been defined. DRO and PCE soil contamination appear to extend off property to the northwest.

Robert Weimer

3/28/2008

Update or Other Action

Meeting with RP's consultant to discuss future work at this site. They will provide a plan to conduct additional assessment of the downgradient property. They will also research past use of the property.

Robert Weimer

8/4/2008

Document, Report, or Work plan Review - other

ADEC approves treatment of contaminated purge water.

Robert Weimer

8/28/2008

Update or Other Action

Talked with downgradient property owners consultant. They have done some additional soil and groundwater assessment. They plan to submit the results along with a corrective action plan for the contaminated soil and groundwater on their property.

Robert Weimer

9/25/2008

Document, Report, or Work plan Review - other

ADEC approves treatment of contaminated purge water.

Robert Weimer

10/2/2008

Update or Other Action

Talked with downgradient property owners consultant. They have done some additional shallow soil assessment. They plan to submit the results along with a plan for installing 5 shallow monitoring wells and 5 deep monitoring wells to try to define the extent of the LNAPL and DNAPL groundwater contamination on their property. They plan to drill the wells later in October 2008.

Robert Weimer

10/23/2008

Meeting or Teleconference Held

Talked with downgradient property owners consultant. They plan to install 5 shallow monitoring wells and 5 deep monitoring wells to try to define the extent of the LNAPL and DNAPL groundwater contamination on their property. They plan to drill the wells the week of October 27-31, 2008.

Robert Weimer

12/12/2008

Document, Report, or Work plan Review - other

May 3, 2008 sampling of the groundwater. Up to 4.65 ug/l tetrachloroethene (PCE), 3.58 ug/l trichloroethene (TCE), 1.64 ug/l cholorform, and non-detect benzene. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Depth to groundwater was 24.75 to 26.55 feet below ground surface. Groundwater flow direction was to the northwest.

Robert Weimer

12/30/2008

Meeting or Teleconference Held

Talked with downgradient property owners consultant. They have done some additional soil and groundwater assessment in October 2008. They plan to submit the results for the contaminated soil and groundwater assessment on their property and submit a request for the disposal/treatment of the 10 super sacks + 1 drum of contaminated soil (6.6 mg/kg metheylene chloride) and the 2 drums of contaminated purge/decon water. Soils appear to meet Anchorage Regional Landfill levels.

Robert Weimer

1/16/2009

Document, Report, or Work plan Review - other

Review and approve treatment of 11 cubic yards of contaminated drill cuttings and 110 gallons of contaminated purge water generated during the installation of soil borings and monitoring wells on the adjacent downgradient property.

Robert Weimer

2/25/2009

Meeting or Teleconference Held

Meeting with Chevron and their consultants. ADEC is to send a letter to Chevron requesting groundwater monitoring and a supplemental site assessment release investigation workplan for the off property contamination. They are to conduct an evaluation of indoor air at this site.

Robert Weimer

4/28/2009

Update or Other Action

ADEC letter to Chevron requesting groundwater monitoring in 2009 for DRO and HVOCs in all of the monitoring wells at 501 L Street, release investigation workplan by August 1, 2009, indoor air evaluation and recommendations by August 1, 2009, and conceptual site model by August 1, 2009.

Robert Weimer

6/8/2009

Update or Other Action

Approve request to store 1 drum of purgewater at the secure area at the 1414 C Street site.

Robert Weimer

7/24/2009

Update or Other Action

Discuss site with RP's consultant. Review and approve request for extension for submitting CSM and vapor intrusion evaluation from August 1, 2009 to September 1, 2009.

Robert Weimer

8/25/2009

Update or Other Action

ADEC approves suspending, until further notice, the sampling of monitoring wells MW-1, MW-3, MW-B, T-1, T-2, and T-3 for BTEX as requested. ADEC requests that monitoring well MW-4 continue to be sampled for BTEX on an annual basis because it is located at and near where past benzene soil contamination was identified a remaining (October 20, 2005 report).

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

Update or Other Action

Discussed site workplan with Texaco's consultant. They will move one soil boring to near MW-1. They will move one soil boring to between MW-2 and CB-2. They will add one soil boring near T-5. They will move one soil boring from the south of the adjacent property to just north of the Caribou Inn. The Caribou Inn is to be demolished soon.

Robert Weimer

9/21/2009

Document, Report, or Work plan Review - other

Review and approve request for an extension, due to changes in site conditions (removal of Caribou Inn and the collecting of additoinal soil and groundwater data) to November 30, 2009 to submit a Vapor Intrusion Evaluation Report.

Robert Weimer

11/2/2009

Meeting or Teleconference Held

Discussed the proposed sampling of the 13 super sacks that contain drill cuttings and vac-truck shallow soils. Need minimum of 1 field screening sample per super sack. Can group super sacks and collect 1 analytical sample per group if group is less than 10 cubic yards total. Super sacks are currently stored at the 15th & C Street secure yard.

Robert Weimer

11/2/2009

Update or Other Action

Review of June 16, 2009 CRA response to EMS reports. CRA recommends additional assessment to the southeast and southwest of boring B4.

Robert Weimer

11/2/2009

Document, Report, or Work plan Review - other

June 17, 2009 sampling of the groundwater. Up to 4.0 ug/l tetrachloroethene (PCE), 3.0 ug/l trichloroethene (TCE), non-detect GRO, 0.42 mg/l DRO, and non-detect benzene in the groundwater samples collected. Contamination concentrations increased in 1 of the 16 monitoring wells sampled. Depth to groundwater was 25.21 to 27.38 feet below ground surface. Groundwater flow direction was to the northwest.

Robert Weimer

11/5/2009

Document, Report, or Work plan Review - other

ADEC approves treatment of contaminated purge water.

Robert Weimer

11/6/2009

Update or Other Action

Review September 2009 Preliminary Conceptual Site Model. Proposed compounds of concern DRO, benzene, PCE, lead, and arsenic. Potential pathways identified are soil ingestion and dermal contact, groundwater ingestion, inhalation of outdoor air, sediment contact, and ingestion of wild foods.

Robert Weimer

11/12/2009

Site Visit

At the request of the project manager, the quality assurance officer was onsite at 1441 C Street to observe soil sampling of stockpiled soils originating form the 5th and L street location. CRA samplers Susan Lear and Nicole Taylor were onsite to perform the soil sampling. Brent Porter, CSP QAO, was onsite to document the efforts. A site report with phtographs have been placed in the the QA and working file.

Brenton Porter

2/23/2010

Document, Report, or Work plan Review - other

September 19, 2009 sampling of the groundwater. Up to 3.43 ug/l tetrachloroethene (PCE), 3.12 ug/l trichloroethene (TCE), 0.251 mg/l DRO, and non-detect benzene in the groundwater samples collected. Contamination concentrations increased in 11 of the 17 monitoring wells sampled. Depth to groundwater was 25.17 to 27.40 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.

Robert Weimer

4/8/2010

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 being more than 30 feet away from the remaining soil and groundwater contamination at this site. The site is currently used as a parking lot.

Robert Weimer

5/20/2010

Update or Other Action

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

Robert Weimer

6/2/2010

Update or Other Action

Discussed groundwater sampling with Texaco's consultant. They will add PAH analysis to the historic highest DRO monitoring well during the next monitoring event.

Robert Weimer

6/17/2010

Site Visit

Site visit to observe collection of groundwater samples using hydra sleeve sampling gear.

Brenton Porter

6/21/2010

Site Visit

Site visit to observe location of previously missing groundwater monitoring wells and collection of groundwater samples.

Brenton Porter

7/2/2010

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for thermal treatment of 14 supersacks of contaminated drill cuttings.

Robert Weimer

1/21/2011

Document, Report, or Work plan Review - other

Reviewed June 2010 Subsurface Investigation Report. The report documented soil sampling that was conducted on September/October of 2009. 21 borings were sampled to help define the extent of the remaining BTEX, DRO, and VOC contamination on the Texaco property and the property to the west. Up to 9,220 mg/kg DRO, 0.16 mg/kg methylene chloride, 0.25 mg/kg PCE, and 0.054 mg/kg TCE in the soil samples collected. The highest concentrations were generally at or near the soil/water interface located between 23 to 31 feet below ground surface. All of the samples on the downgradient direction (north and west) exceeded cleanup levels PCE and it appears that the contamination extend off property into West 5th Avenue and L Street and beyond. The one soil boring was drilled across L Street had 0.03 mg/kg PCE. The extent of this contamination has not been defined. Confirmation soil samples were also taken the locations that had exceeded cleanup levels in soil samples collected several years ago. The soil boring near T-5 still had PCE contamination at 0.211 mg/kg, MW-1 at 0.104 mg/kg, and MW-2 at 0.11 mg/kg. The soil sample collected at 10 feet below ground surface near MW-3 met cleanup levels for GRO and DRO.

Robert Weimer

1/25/2011

Document, Report, or Work plan Review - other

June 17-21, 2010 sampling of the groundwater. Up to 3.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 0.11 mg/l DRO, and non-detect benzene. One monitoring well (DP-5S) was sampled for PAH's with Napthalene the only detectable compound at 0.000027 mg/l. Contamination levels increased in 1 of the 11 monitoring wells sampled. Depth to groundwater was 25.72 to 27.67 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.

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

7/26/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

11/21/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves treatment of contaminated purge water.

Robert Weimer

12/6/2011

Document, Report, or Work plan Review - other

May 24, 2011 sampling of the groundwater. Up to 4.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 0.94 mg/l DRO, and non-detect benzene. Contamination concentrations increased in 4 of the 7 monitoring wells sampled. Depth to groundwater was 25.85 to 27.83 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.

Robert Weimer

3/7/2012

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/28/12. Chevron will submit a workplan for collecting soil vapor samples to assess for potential solvent vapor intrusion into nearby buildings. Additional release investigation may be required to define the off property DRO and PCE contamination. They are to continue semi-annual groundwater monitoring.

Robert Weimer

4/4/2012

Document, Report, or Work plan Review - other

On May 17, 2008 three soil borings were drilled off-property just across 5th Avenue in front of the Captain Cook Parking Garage at 420 K Street. The parking garage has two sub-levels to a depth of 20 to 25 feet below ground surface (bgs). Eleven soil samples and three groundwater samples were collected from the borings. Up to 0.18 mg/kg Tetrachloroethene (PCE) and non detect DRO, RRO, GRO, benzene, and (0.03 mg/kg detection limit) Trichloroethene (TCE) in the soil. PCE soil contamination was encountered between 13.5 to 25 feet bgs. Higher soil concentrations may exist since none of the soil samples were collected from the soil/water interface. Up to 0.26 mg/l DRO, non-detect RRO, non-detect GRO, non-detect benzene, 0.0014 mg/l TCE, and non-detect PCE in the groundwater samples collected. The groundwater sample results may be biased low for benzene, GRO, PCE and TCE because a peristaltic pump was used to collect the groundwater samples. Groundwater was encountered between 25.5 and 27 feet below ground surface.

Robert Weimer

8/17/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves offsite treatment of contaminated purge water.

Robert Weimer

10/11/2012

Document, Report, or Work plan Review - other

May 23, 2012 sampling of the groundwater. Up to 5.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 0.87 mg/l DRO, and non-detect benzene. Contamination concentrations increased in 5 of the 6 monitoring wells sampled. Depth to groundwater was 25.62 to 27.51 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.

Robert Weimer

11/2/2012

Document, Report, or Work plan Review - other

ADEC provided the following comments on the Vapor Intrusion Assessment Work Plan:1. We need completed Building Survey and Indoor Air Sampling Questionnaire’s form item #5 (Basement And Construction Characteristics) for each building. This information is important to determine the location, number, and depths of the soil gas probes. Note that some buildings may have basements or deeper areas only on portions of the building. 2. One liter suma canisters are requested. 3. A “shut in” test in addition to the tracer leak detection is requested. 4. The use of a helium detector on-site to test for leaks before the samples are collected is requested. 5. The building across the intersection to the northwest will also need vapor probes.

Robert Weimer

11/2/2012

Document, Report, or Work plan Review - other

July 30, 2012 sampling of the groundwater. Up to 6.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE), 1.5 mg/l DRO, and non-detect benzene in the groundwater samples collected. Contamination concentrations increased in 2 of the 11 monitoring wells sampled. Depth to groundwater was 25.41 to 27.45 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells.

Robert Weimer

2/8/2013

Update or Other Action

Reviewing request for reduction in groundwater monitoring. Requested information from consultant regarding what interval was sampled in each monitoring well during the 7/30/12 monitoring event.

Robert Weimer

2/11/2013

Update or Other Action

DEC review of request for reduction in groundwater monitoring at this site. DEC requested that the next monitoring event that all of the monitoring wells are purged prior to sampling. DEC also requested that the deep wells have the samples collected within the deeper screened interval of 30 to 40 feet below ground surface.

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 semi-annual groundwater monitoring to monitor for natural attenuation and trends, and a vapor intrusion work plan. We also discussed that soil gas probes won’t be needed for the above ground bike rental shed, and they need to sample within the screened interval of the deep monitoring wells (that depth based on soil stratigraphy and contamination depth. 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

3/28/2013

Site Visit

Site visit to observe current site conditions.

Robert Weimer

6/14/2013

Update or Other Action

DEC requests that a well point screened at 5 feet bgs and another screened 10 feet bgs for each location for slab on grade buildings.

Robert Weimer

1/14/2014

Document, Report, or Work plan Review - other

May 2, 2013 sampling of the groundwater. Up to 12.0 ug/l tetrachloroethene (PCE), 0.5 ug/l trichloroethene (TCE), and 0.57 mg/l DRO. Contamination concentrations increased in 5 of the 13 monitoring wells sampled. Depth to groundwater was 25.06 to 26.72 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by both no purge (Hydrasleeve) and purge (bladder pump). The Hydrasleeve samples were collected from the top of the water column in each monitoring well. The depth of sampling with the bladder pump was not documented.

Robert Weimer

2/12/2014

Document, Report, or Work plan Review - other

September 13-14, 2013 sampling of the groundwater. Up to 6.7 ug/l tetrachloroethene (PCE), 2.1 ug/l trichloroethene (TCE), and 1.3 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 6 of the 13 monitoring wells sampled. Depth to groundwater was 23.52 to 25.66 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by no purge (Hydrasleeve). The Hydrasleeve samples were collected from the top of the water column in the shallow monitoring wells and at the bottom of the water column in the deep monitoring wells.

Robert Weimer

2/27/2014

Meeting or Teleconference Held

Meeting with Chevron and their consultants on 2/27/2014. They plan to continue semi-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. They submit a work plan for soil gas sampling event to help evaluated the vapor intrusion pathway, they will also look to see if the building has an elevator shaft. In the future they will need to evaluate for a diving plume on the monitoring wells far from the release point. Chevron will submit a work plan for the monitoring well sampling including the top and bottom of the water column, but depending on the length of water in the monitoring well and boring log they may need to sample more than just the top and bottom. They plan to look for a off-property source for the solvent contamination. 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.

Robert Weimer

1/28/2015

Document, Report, or Work plan Review - other

May 7, 2014 sampling of the groundwater. Up to 7.4 ug/l tetrachloroethene (PCE), 0.48 ug/l trichloroethene (TCE), and 0.8 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 3 of the 13 monitoring wells sampled. Depth to groundwater was 24.62 to 26.94 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by no purge (Hydrasleeve) and purge (low flow). Because most of the Hydrasleeve and low flow samples were not collected from the top of the water column in the shallow monitoring wells and at the bottom of the water column in the deep monitoring wells as required the samples are considered biased low.

Robert Weimer

5/26/2015

Document, Report, or Work plan Review - other

October 4, 2014 sampling of the groundwater. Up to 3.8 ug/l (5 ug/l cleanup level) tetrachloroethene (PCE), 0.37 ug/l trichloroethene (TCE), 0.25 ug/l benzene, and 0.16 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 13 of the 13 monitoring wells sampled. Depth to groundwater was 24.49 to 26.68 feet below ground surface. Groundwater flow direction was to the northwest. Semi-annual groundwater monitoring is to continue to document seasonal trends in the newer monitoring wells. Samples were collected by purge using a bladder pump. 8 of the 10 samples were not collected from the top of the water column in the shallow monitoring wells (only monitoring wells T-2 and T-3 were sampled at the required interval) and at the bottom of the water column in the deep monitoring wells as required the samples are considered biased low and can't be used to define the extent of contamination or trends.

Robert Weimer

6/5/2015

Offsite Soil or Groundwater Disposal Approved

ADEC approves temporary storage of drums of soil cuttings and purge water at the secure area at 1441 C Street.

Robert Weimer

9/28/2015

Conceptual Site Model Submitted

Conceptual Site Model submitted. It identified completed pathways for soil and groundwater ingestion, soil dermal absorption, inhalation of outdoor and indoor air.

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

2/3/2016

Offsite Soil or Groundwater Disposal Approved

DEC approves of request to dispose of 1 drum of contaminated drill cuttings at WMI's Arlington Landfill. The drill cuttings were generated during the June 12, 2015 release investigation work.

Robert Weimer

4/22/2016

Document, Report, or Work plan Review - other

May 2, 2015 sampling of the groundwater. Up to 5.0 ug/l tetrachloroethene (PCE), non-detect trichloroethene (TCE) and benzene, and 0.17 mg/l DRO in the groundwater samples collected. Contamination concentrations increased in 6 of the 11 monitoring wells sampled. Depth to groundwater was 25.23 to 27.27 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected without purging using a HydraSleeve for volatiles and bailers for non-volatiles.

Robert Weimer

8/15/2016

Document, Report, or Work plan Review - other

On June 4-5, 2015 soil samples were collected from 6 borings to help assess the current concentrations of PCE in the soil at the northern portion former gas station property. Three borings were sampled to groundwater (25 feet below ground surface (bgs)) along the northern edge of the property, and three to 10 feet bgs near the former used oil tank and other USTs. Up to 0.26 mg/kg PCE in the 27 soil samples and 2 duplicate sample analyzed. Note that only PCE was analyzed in those soil samples, it did not include analysis for TCE or other solvents/breakdown products. Two soil samples (one at 20 feet bgs in soil boring SB-1 and one at 2 feet bgs in soil boring SB-3) and one duplicate were analyzed for PAHs, all were below proposed cleanup levels. The highest field screening location SB-4 at 2 feet bgs did not have PAH analysis. Soil boring SB-3 that had the highest PCE concentration (0.26 mg/kg at 25 ft bgs) had similar PCE concentration to the concentration of PCE in SB09-18 (0.25 mg/kg at 27 ft bgs) in September of 2009, located about 15 feet to the east of SB-3.

Robert Weimer

8/18/2016

Document, Report, or Work plan Review - other

November 2-3, 2015 sampling of the groundwater. Up to 11 ug/l tetrachloroethene (PCE), 0.5 ug/l trichloroethene (TCE), non-detect benzene, and 0.73 mg/l DRO. Contamination concentrations increased in 8 of the 12 monitoring wells sampled. Depth to groundwater was 24.87 to 26.93 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected without purging using a HydraSleeve for volatiles and bailers for non-volatiles. The depth of the hydrasleeve sampling was not documented in the field notes for DP-4D and DP-5D so those results may be biased low. DP-3D Hydrasleeve sampling was not collected at the deeper interval as required so its results are considered biased low. The DRO samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.

Robert Weimer

8/26/2016

Update or Other Action

ADEC requests that the site sampling for VOCs continue until it is demonstrated to be caused by a another specific source. This would entail the collection (in accordance with an ADEC approved work plan) of soil and groundwater samples near the specific source and between the source and this site. ADEC noted that there have been problems with the interval sampled in the deep monitoring wells (DP-3D, DP-4D, and DP-5D). ADEC requests a work plan be submitted by October 1, 2016 for the groundwater monitoring at this site, that includes details on the method of sampling collection, analysis, and sampling frequency. ADEC requests that future groundwater monitoring be conducted by purge method, using a device such as an in-well or bladder pump that minimizes the loss of volatiles. ADEC also requests that the next monitoring event include PAH analysis in monitoring wells T-1, T-2, T-3, MW-2 (if it has sufficient water to sample), D-P3S, DP-3D, DP-5S, and DP-5D.

Robert Weimer

2/28/2017

Document, Report, or Work plan Review - other

June 21-22, 2016 sampling of the groundwater. Up to 5 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), non-detect benzene, and 0.24 mg/l DRO. Contamination concentrations increased in 2 of the 13 monitoring wells sampled. Depth to groundwater was 25.35 to 27.36 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected without purging using a HydraSleeve for volatiles and bailers for non-volatiles. DP-3D Hydrasleeve sampling was not collected at the deeper interval as required so its results are considered biased low. The DRO samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.

Robert Weimer

3/23/2017

Document, Report, or Work plan Review - other

DEC conditionally approves the February 27, 2017 monitoring well installation work plan. The work plan proposes to install two monitoring wells (one at the northwest corner of 6th and K Street and the other on 7th Avenue to the northwest of the American Linen Cleaners building) and collect soil and groundwater samples at those locations.

Robert Weimer

10/20/2017

Document, Report, or Work plan Review - other

May 30-31, 2017 sampling of the groundwater. Up to 5 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), 2.0 ug/l Chloroform, non-detect benzene, and non-detect DRO. Contamination concentrations increased in 3 of the 12 monitoring wells sampled. Depth to groundwater was 25.21 to 27.22 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected after purging using a bladder pump. Since the samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.

Robert Weimer

2/21/2018

Document, Report, or Work plan Review - other

August 8-9, 2017 sampling of the groundwater. Up to 4 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), 1.0 ug/l Chloroform, non-detect benzene, and non-detect DRO. Contamination concentrations increased in 3 of the 15 monitoring wells sampled. Depth to groundwater was 18.45 to 27.83 feet below ground surface. Groundwater flow direction was to the west. Samples were collected after purging using a bladder pump. Since the samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low.

Robert Weimer

6/20/2018

Offsite Soil or Groundwater Disposal Approved

DEC approves of request to transport and treat of 1 drum of contaminated purge water and 1.3 cubic yards of contaminated drill cuttings at Clean Harbors Aragonite Incineration Facility in Utah. The purge water and drill cuttings were generated during the June/July 2017 release investigation work.

Robert Weimer

11/5/2018

Document, Report, or Work plan Review - other

On June 28, 2017 two soil borings were sampled and completed as monitoring wells (MW-5 and MW-6). These monitoring wells were installed up gradient of the 1006 West 5th Avenue property to help assess the potential impact of an up gradient dry cleaner site. The soil samples collected had up to 0.0046 mg/kg acenaphthylene (18 mg/kg 2016 cleanup level), 0.00086 mg/kg anthracene (390 mg/kg 2016 cleanup level), 0.0016 mg/kg chrysene (82 mg/kg 2016 cleanup level), 0.00088 mg/kg fluoranthene (36 mg/kg 2016 cleanup level), 0.0089 mg/kg phenanthrene (39 mg/kg 2016 cleanup level), 0.0013 mg/kg pyrene (87 mg/kg 2016 cleanup level), 0.0074 mg/kg naphthalene (0.038 mg/kg 2016 cleanup level), and 0.33 mg/kg tetrachloroethylene (PCE) (0.19 mg/kg 2016 cleanup level) in MW-6 which was located closer to the dry cleaner site. Samples over PCE cleanup levels were found at 10 feet below ground surface (bgs) and 22.5 feet bgs. The soil samples were analyzed for VOC(PCE only) and PAHs. Groundwater was encountered a 21 feet bgs in MW-5 and 23 feet bgs in MW-6.

Robert Weimer

1/17/2019

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77662 solvents.

Robert Weimer

6/6/2019

Document, Report, or Work plan Review - other

May 14-16, 2018 sampling of the groundwater. Up to 3 ug/l tetrachloroethene (PCE), non-detect ug/l trichloroethene (TCE), 2.0 ug/l Chloroform, non-detect benzene, EDB and 1,2-DCA, and 0.97 mg/l DRO. Contamination concentrations increased in 4 of the 14 monitoring wells sampled. Depth to groundwater was 21.57 to 27.01 feet below ground surface. Groundwater flow direction was to the west. Samples were collected after purging using a bladder pump. Since the samples collected from DP-3D, DP-4D, and DP-5D were not collected at the deeper interval as required so those results are considered biased low. The deeper screened interval is 30 to 40 feet below ground surface.

Robert Weimer

8/1/2019

Document, Report, or Work plan Review - other

October 8-9, 2018 sampling of the groundwater. Up to 6 ug/l tetrachloroethene (PCE), 0.3 ug/l trichloroethene (TCE), 2.0 ug/l Chloroform, non-detect benzene, EDB and 1,2-DCA, and 0.46 mg/l DRO. Contamination concentrations increased in 3 of the 13 monitoring wells sampled. Depth to groundwater was 23.59 to 27.04 feet below ground surface. Groundwater flow direction was to the northwest. Samples were collected after purging using a bladder pump. The deeper monitoring wells were sampled from their screened interval.

Robert Weimer

9/23/2019

Update or Other Action

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 unless the well screened interval is deeper, then in that case from the top foot of that screened interval. Also all HVOC 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.

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.

Robert Weimer

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

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

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

4/3/2023

Long Term Monitoring Workplan or Report Review

ADEC provided comments on the Groundwater Sampling Analyte Reduction Request – Groundwater Sampling Work Plan Addendum which proposes to update the groundwater monitoring schedule to include a revised analyte list for semi-annual monitoring at site wells DP-3D, DP-3S, DP-4D, DP-4S, DP-5D, DP-5S, MW-A, MW-B, MW-1 through MW-6, and T-1 through T-3.

Rebekah Reams

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

2018 Monitoring Well Installation Report

2015 Site Assessment Report

2014 Revised Conceptual Site Model

2008 Shallow Soil Delineation Investigation Report

2008 Groundwater Assessment Investigation

2007 Phase II Environmental Site Assessment

2005 Subsurface Investigation Report

2017 First Semi-Annual Groundwater Monitoring Report

2010 First Semi-Annual Groundwater Monitoring Report

2003 Second Semi-Annual Groundwater Monitoring Report

2003 First Semi-Annual Groundwater Monitoring Report

2002 First Semi-Annual Groundwater Monitoring Report

2015 First Semi-Annual Groundwater Monitoring Report

2012 Second Semi-Annual Groundwater Monitoring Report

2012 First Semi-Annual Groundwater Monitoring Report

2016 First Semi-Annual Groundwater Monitoring Report

2011 First Semi-Annual Groundwater Monitoring Report

May 2018 Groundwater Monitoring Report

No associated sites were found.

Missing Location Data

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Alaska Department of Environmental Conservation

Site Report: Texaco - Former -1006 West 5th

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

2018 Monitoring Well Installation Report

2015 Site Assessment Report

2014 Revised Conceptual Site Model

2008 Shallow Soil Delineation Investigation Report

2008 Groundwater Assessment Investigation

2007 Phase II Environmental Site Assessment

2005 Subsurface Investigation Report

2017 First Semi-Annual Groundwater Monitoring Report

2010 First Semi-Annual Groundwater Monitoring Report

2003 Second Semi-Annual Groundwater Monitoring Report

2003 First Semi-Annual Groundwater Monitoring Report

2002 First Semi-Annual Groundwater Monitoring Report

2015 First Semi-Annual Groundwater Monitoring Report

2012 Second Semi-Annual Groundwater Monitoring Report

2012 First Semi-Annual Groundwater Monitoring Report

2016 First Semi-Annual Groundwater Monitoring Report

2011 First Semi-Annual Groundwater Monitoring Report

May 2018 Groundwater Monitoring Report

Missing Location Data

State of Alaska Department of Environmental Conservation