| Action Date |
Action |
Description |
DEC Staff |
| 10/21/1986 |
Underground Storage Tank Site Characterization or Assessment |
RZA completed a subsurface petroleum hydrocarbon evaluation for Unocal Station 4854 (Mapco Express 5003) contamination found. |
Former Staff |
| 12/11/1987 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 78006 Petroleum contaminant. |
Former Staff |
| 12/11/1987 |
Site Added to Database |
|
Former Staff |
| 12/12/1987 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU Date changed DB conversion |
Former Staff |
| 5/25/1990 |
Document, Report, or Work plan Review - other |
Hart Crowser sampled on-property monitoring wells. 0.3 ug/l benzene detected in MW-3. |
Former Staff |
| 9/5/1990 |
Document, Report, or Work plan Review - other |
RZA, B-C Excavating; 7 USTs removed; 225 cubic yards of soil thermally treated at AS&G. RZA report shows 3 areas impacted: soil/groundwater on west property boundary, soil in area of former piping islands, soil/groundwater in area of tanks. On September 5, 1990 a total of 50 cubic yards of contaminated soil was excavated from two log crib areas on the northwest and western portions of the property and thermally treated. A composite sample collect from the base of the western crib had 13,687 mg/kg TPH, and 11,731 mg/kg DRO. No samples were collected at the northwest crib area. At the same time 6 underground storage tanks were removed. The fuel piping, tank excavation, and dispenser island samples were collected that had up to 9,600 mg/kg DRO (left after piping removal), 28 mg/kg total halogens (used oil tank stockpile), and 799 mg/kg benzene (left after piping removal) in the soil samples collected. Contaminated stockpiles were also generated during the removal of the tanks, piping, and dispenser islands.
|
Former Staff |
| 10/4/1990 |
Document, Report, or Work plan Review - other |
RZA Consultants installed a vapor extraction system. Vertical PVC screens installed at 4 locations. Perforated drain line installed in area of 3 remaining tanks. |
Former Staff |
| 2/22/1991 |
Document, Report, or Work plan Review - other |
RZA Inc. sent in water well inventory within 1/4 mi. radius of site. 19 developed lots out of 61 suspected of having a water well. Closest suspect well downgradient is at 2809 Spenard Rd. 200' from site. 6 lots upgradient, 3 along gradient, 9 downgradient from site. |
Former Staff |
| 8/12/1991 |
Offsite Soil or Groundwater Disposal Approved |
Anchorage Sand & Gravel received & processed 546 tons of fuel stained soils from Mapco #5003. Analysis of the remediated soils was attached & blended with AC-5 for use as a black base material. |
Former Staff |
| 9/5/1991 |
Document, Report, or Work plan Review - other |
RZA sent in workplan for asphalt incorporation of stockpile at 7th & C site. Soil to be moved from Mapco #3 site to 636 C street. The material is suitable for use as aggregate in a cold asphalt pavement. |
Former Staff |
| 12/19/1991 |
Document, Report, or Work plan Review - other |
Mapco started the soil vapor extraction system. Unocal is working with RZA to address soil contamination on the western portion of the site. |
Former Staff |
| 6/10/1992 |
Leaking Underground Storage Tank Corrective Action Underway |
RZA AGRA submitted a corrective action plan for in-situ bioremediation in the area of the former used oil tank, heating oil tank and septic cribs. The plan was not approved. Requested submittal of engineered plans by not later than 07/24/92. Informed Mapco of need to obtain a wastewater discharge permit. |
Former Staff |
| 11/20/1992 |
Offsite Soil or Groundwater Disposal Approved |
Receipts & results for 139 tons of soils thermally treated at ASR. |
Former Staff |
| 2/9/1993 |
Document, Report, or Work plan Review - other |
On November 13-14, 1991 three soil borings were sampled and two were completed as monitoring wells. The soil boring in the west crib area had 11,000 mg/kg TPH, 5,000 mg/kg DRO, 135 mg/kg GRO, and non-detect (<0.05 mg/kg benzene) in the soil sample collected at 10-11.5 feet below ground surface (bgs). The bottom of the west crib was identified at 16 feet bgs, and soils with petroleum odors were identified from 10 to 16.5 feet bgs. Groundwater was identified at 17 to 18 feet bgs in the two monitoring wells.
|
Robert Weimer |
| 2/9/1993 |
Underground Storage Tank Site Characterization or Assessment |
Excavated 9/15/92 by RZA. 93 cubic yards of contaminated soils to be thermally treated at ASR, and 17 cubic yards of contaminated soil to be disposed of at the Anchorage Regional Landfill. One soil sample near groundwater interface (14.5 ft) had 4,740 mg/kg TPH & 914 mg/kg DRO. |
Former Staff |
| 7/1/1993 |
Update or Other Action |
Owner submitted proposed closure activities- sampling soil through 7 borings within currently remediated areas. Department requests boring locations altered and southwest corner of property also investigated. |
Former Staff |
| 10/20/1994 |
Document, Report, or Work plan Review - other |
Performed a Corrective Action Report review. |
Former Staff |
| 6/1/1995 |
Update or Other Action |
Discussed closure requirements with RP. |
Former Staff |
| 7/25/1995 |
Update or Other Action |
Met with RP to discuss status of site. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: MAPCO EXPRESS INC |
Former Staff |
| 4/20/2004 |
Document, Report, or Work plan Review - other |
April 20, 2004 groundwater monitoring conducted by Williams. Up to 3.45 mg/l GRO, 2.32 mg/l DRO, and 314 ug/l benzene. Concentrations appear to increasing slightly. |
Robert Weimer |
| 8/30/2004 |
Update or Other Action |
Site to be cleaned up and monitored by Mapco/Williams/Holidays |
Robert Weimer |
| 9/24/2004 |
Document, Report, or Work plan Review - other |
September 24, 2004 groundwater monitoring conducted by Williams. Up to 17.4 mg/l GRO, 3.2 mg/l DRO, and 3,230 ug/l benzene in the groundwater. The most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Concentrations have increased in 1 of the 5 monitoring wells sampled. Depth to groundwater was 17 to 18.5 feet below ground surface. Groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 10/14/2005 |
Document, Report, or Work plan Review - other |
October 14, 2005 groundwater monitoring conducted by Williams. Only monitoring wells MW-4 and MW-10 were sampled during this monitoring event. Up to 1,260 ug/l benzene, 9.22 mg/l GRO, and 3.74 mg/l DRO in the groundwater. This is a increase in 1 of the 2 monitoring wells sampled. Monitoring well MW-4 was historically the most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Depth to groundwater was 16.80 to 16.95 feet below ground surface. Historically the groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 3/29/2006 |
Document, Report, or Work plan Review - other |
March 29, 2006 groundwater monitoring conducted by Williams. Only monitoring wells MW-4 and MW-10 were sampled during this monitoring event. Up to 52 ug/l benzene, 16.9 mg/l GRO, and 1.75 mg/l DRO in the groundwater. This is a increase in 2 of the 2 monitoring wells sampled. Monitoring well MW-4 was historically the most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Depth to groundwater was 17.62 to 17.81 feet below ground surface. Historically the groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 9/12/2006 |
Document, Report, or Work plan Review - other |
September 12, 2006 groundwater monitoring conducted by Williams. Only monitoring wells MW-4 and MW-10 were sampled during this monitoring event. Up to 84 ug/l benzene, 34.6 mg/l GRO, and 0.419 mg/l DRO in the groundwater. This is a increase in 1 of the 2 monitoring wells sampled. Monitoring well MW-4 was historically the most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Depth to groundwater was 17.55 to 17.70 feet below ground surface. Historically the groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 3/27/2007 |
Document, Report, or Work plan Review - other |
March 27, 2007 groundwater monitoring conducted by Williams. Only monitoring well MW-4 was sampled during this monitoring event. Up to 57.4 ug/l benzene, 4.70 mg/l GRO, and 3.03 mg/l DRO in the groundwater. This is a increase from the previous monitoring event for DRO. This monitoring well was historically the most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Depth to groundwater was 17.65 feet below ground surface. Historically the groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 9/19/2007 |
Document, Report, or Work plan Review - other |
September 19, 2007 groundwater monitoring conducted by Williams. Only monitoring well MW-4 was sampled during this monitoring event. It had 2.14 ug/l benzene, 0.418 mg/l GRO, and 0.318 mg/l DRO in the groundwater. This is a decrease from the previous monitoring event. This monitoring well was historically the most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Depth to groundwater was 18.10 feet below ground surface. Historically the groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 4/22/2008 |
Document, Report, or Work plan Review - other |
April 22, 2008 groundwater monitoring conducted by Williams. Only monitoring well MW-4 was sampled during this monitoring event. This monitoring well was historically the most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Concentrations were non detect for BTEX, GRO, and DRO, this was a decrease from the previous monitoring event. Depth to groundwater was 18.31 feet below ground surface. Historically the groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 5/5/2008 |
Exposure Tracking Model Ranking |
Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. |
Robert Weimer |
| 9/18/2008 |
Document, Report, or Work plan Review - other |
September 18, 2008 groundwater monitoring conducted by Williams. Only monitoring well MW-4 was sampled during this monitoring event. This monitoring well was historically the most contaminated monitoring well is located about 60 feet downgradient of the identified soil contamination area. Concentrations were non detect for BTEX, GRO, and DRO. Depth to groundwater was 17.69 feet below ground surface. Historically the groundwater flow direction is to the south by southeast. |
Robert Weimer |
| 3/19/2009 |
Update or Other Action |
File review - Need additional soil and groundwater assessment at the two crib areas to determine the current contamination levels. |
Robert Weimer |
| 1/12/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78006 1987 UST contamination. Update based on downgradient groundwater monitoring results. |
Robert Weimer |
| 10/28/2011 |
Update or Other Action |
Need additional soil and groundwater assessment at the two crib areas to determine the current contamination levels. |
Robert Weimer |
| 2/26/2013 |
Meeting or Teleconference Held |
Meeting with Chevron and their consultants on 2/26/13. Chevron is to review the site information and to assign a consultant to provide as work plan to assess current soil and groundwater contamination concentrations at this site. |
Robert Weimer |
| 2/27/2014 |
Meeting or Teleconference Held |
Meeting with Chevron and their consultants on 2/27/14. DEC to review work plan to assess current soil and groundwater contamination concentrations at this site that was submitted on 2/10/2014. Will need quarterly groundwater monitoring for a minimum of one year to establish trends and need to sample off-property to the west where the tank/crib was. We discussed that the groundwater samples needs to be collected as close as possible to the soil/water interface, with the pump intake within a foot of the soil/water interface at the time of the sampling. |
Robert Weimer |
| 12/8/2015 |
Update or Other Action |
Need additional soil and groundwater assessment at the two crib areas to determine the current contamination levels. |
Robert Weimer |
| 12/16/2016 |
Update or Other Action |
DEC request for a revised assessment work plan to include quarterly groundwater monitoring for a minimum of one year to establish trends and need to sample off-property to the west where the tank/crib was. The groundwater samples needs to be collected as close as possible to the soil/water interface, with the pump intake within a foot of the soil/water interface at the time of the sampling. |
Robert Weimer |
| 3/30/2017 |
Document, Report, or Work plan Review - other |
DEC conditionally approves March 15, 2017 work plan to install 4 long term monitoring wells and collect soil and groundwater samples to help assess the current concentrations at the former 2 crib areas. |
Robert Weimer |
| 4/7/2017 |
Update or Other Action |
DEC clarifies with the consultant that all 4 soil borings are to be completed as monitoring wells. |
Robert Weimer |
| 8/10/2017 |
Site Visit |
Site visit to discuss locations of the proposed soil borings/monitoring wells. They will place the one boring/monitoring wells to the southeast instead of south. They plan to begin drilling on August 28th. |
Robert Weimer |
| 3/30/2018 |
Document, Report, or Work plan Review - other |
September 7, 2017 groundwater monitoring conducted by Chevron's consultant (GHD) on the 3 of the 4 new monitoring wells installed on August 30-31, 2017. Depth to groundwater was 17.72 to 18.41 feet below ground surface. The groundwater flow direction was to the southeast. Up to 0.11 mg/l DRO, 0.09 mg/l RRO, and 2.0 ug/l Chloroform (which was not detected in the QA samples) in the monitoring wells sampled. The other VOCs and GRO were non-detect. The samples were not analyzed for PAHs. Monitoring well MW2 was not sampled since a petroleum sheen and 0.2 inches of product was observed during the well development on September 5, 2017. The monitoring wells were sampled after purging with a bladder pump within the top foot of the water column. |
Robert Weimer |
| 6/25/2018 |
Offsite Soil or Groundwater Disposal Approved |
DEC approves treatment of 3 drums of contaminated purge/development water at NRC. DEC also approves the disposal of 11 drums of contaminated drill cuttings at the Waste Management Arlington landfill. The water and soil were generated from the 4 monitoring wells that were installed during the 2017 release investigation work. |
Robert Weimer |
| 7/2/2018 |
Document, Report, or Work plan Review - other |
March 26, 2018 groundwater monitoring conducted by Chevron's consultant (GHD) of the new monitoring wells installed on August 30-31, 2017. Depth to groundwater was 17.72 to 18.41 feet below ground surface. The groundwater flow direction on the previous monitoring event was to the southeast. The one monitoring well sampled MW-3 was non-detect for DRO, GRO, RRO, and BTEX. Monitoring well MW1 was not sampled since it had 0.1 inches of product. The were not able to sample monitoring wells MW-2 (blocked by ice) and MW-4 (covered with snow). The monitoring well was sampled after purging with a bladder pump within the top foot of the water column. |
Robert Weimer |
| 10/24/2018 |
Document, Report, or Work plan Review - other |
June 18, 2018 groundwater monitoring conducted by Chevron's consultant (GHD) on the 4 of the 4 new monitoring wells installed on August 30-31, 2017. Depth to groundwater was 17.16 to 17.91 feet below ground surface. The groundwater flow direction was to the southeast. Up to 1.7 mg/l DRO, 1.0 mg/l RRO, and 2.0 ug/l Chloroform (which was not detected in the QA samples) in the monitoring wells sampled. The other VOCs, EDB, and GRO were non-detect. The samples were not analyzed for PAHs. The monitoring wells were sampled after purging with a bladder pump within the top foot of the water column. |
Robert Weimer |
| 11/15/2018 |
Document, Report, or Work plan Review - other |
On August 7 to 10, 2017 four soil borings were sampled and they were all completed as monitoring wells. Groundwater was encountered between 17 and 19 feet below ground surface (bgs). The monitoring wells have a screened interval from 10 to 25 feet bgs. The soil samples collect had up to 2,200 mg/kg DRO, 0.8 mg/kg GRO, 2,600 mg/kg RRO, 0.068 mg/kg benzene, 0.2 mg/kg ethylbenzene, 0.018 mg/kg PCBs, and 1.9 mg/kg xylenes. The rest of the compounds were non-detect or below current site cleanup levels. The Arsenic and Chromium exceeded cleanup levels but they appear to be at naturally occurring concentrations. |
Robert Weimer |
| 1/16/2019 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78006 1987 UST contamination. |
Robert Weimer |
| 1/28/2019 |
Document, Report, or Work plan Review - other |
August 9, 2018 groundwater monitoring conducted by Chevron's consultant (GHD) on the 3 of the 4 new monitoring wells installed on August 30-31, 2017. Depth to groundwater was 17.17 to 18.41 feet below ground surface. The groundwater flow direction was to the southeast. Up to 1.7 mg/l DRO, 1.0 mg/l RRO, and 2.0 ug/l Chloroform (which was not detected in the QA samples) in the monitoring wells sampled. The other VOCs, EDB, and GRO were non-detect. The samples were not analyzed for PAHs. The monitoring wells were sampled after purging with a bladder pump within the top foot of the water column. ADEC sent request for the missing 8260 naphthalene results for this and any other GHD sites and that the naphthalene results be included on the monitoring event and historical data tables for all of those sites. |
Robert Weimer |
| 2/27/2019 |
Document, Report, or Work plan Review - other |
October 22, 2018 groundwater monitoring conducted by Chevron's consultant (GHD) on the 4 of the 4 new monitoring wells installed on August 30-31, 2017. Depth to groundwater was 16.21 to 16.91 feet below ground surface. The groundwater flow direction was to the southeast. Up to 3.2 mg/l DRO, 2.3 mg/l RRO, and 4.0 ug/l Chloroform (which was not detected in the QA samples) in the monitoring wells sampled. Concentrations increased in 2 of the 4 monitoring wells sampled. The other VOCs and GRO were non-detect. The samples were not analyzed for PAHs. The monitoring wells were sampled after purging with a bladder pump within the top foot of the water column. ADEC sent request for the missing 8260 naphthalene results for this and any other GHD sites and that the naphthalene results be included on the monitoring event and historical data tables for all of those sites. |
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. Also all BTEX and VOC sampling needs to include the full 8260 VOC list including naphthalene. ADEC is also requesting that all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. ADEC also requests for the next two monitoring events add PAH analysis for all of the site monitoring wells to be sampled. |
Robert Weimer |
| 3/17/2020 |
Document, Report, or Work plan Review - other |
DEC reviewed 2020 groundwater sampling plan and provided the following comments: For all future monitoring events please make sure that the field notes document the measurement of the pump intake that is within the top foot of the water column at the time of the sampling unless the top of the well screened interval is deeper, then in that case from the top foot of that screened interval. For all future monitoring events any monitoring well where BTEX or HVOC sampling is proposed it needs to be the full VOC (method 8260) list, including naphthalene. The field QC samples are per day of sampling at a site. For all future monitoring events all reports be submitted within 60 days of the sampling and the groundwater monitoring figure include a diagram showing historic groundwater flow directions. For all future monitoring events if a monitoring well is low yield and purges dry then a sample will still need to be collected that monitoring event once the monitoring well has recharged to approximately 80% of its pre-purge volume. If it has not returned to 80% of its pre-purged volume during that sampling day DEC requests that you return to the site early the next day to attempt to collect the water sample. DEC also requested for the next two monitoring events to add PAH analysis for all monitoring wells to be sampled. |
Robert Weimer |
| 7/20/2020 |
Document, Report, or Work plan Review - other |
2020 Second Quarter Groundwater Monitoring event was conducted on May 11, 2020. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, RRO, VOC, and PAH analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 14.69 to 15.40 feet below ground surface. DRO, RRO, and chloroform exceeded cleanup levels during this monitoring event. |
Rebekah Reams |
| 9/24/2020 |
Document, Report, or Work plan Review - other |
2020 Third Quarter Groundwater Monitoring event was conducted on July 29, 2020. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, RRO and VOC analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 14.65 to 15.35 feet below ground surface. DRO, RRO, and chloroform exceeded cleanup levels during this monitoring event. |
Rebekah Reams |
| 12/4/2020 |
Document, Report, or Work plan Review - other |
2020 Fourth Quarter Groundwater Monitoring event was conducted on October 5, 2020. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, RRO, VOC, and PAH analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 14.51 to 15.23 feet below ground surface. DRO, RRO, and chloroform exceeded cleanup levels during this monitoring event. |
Rebekah Reams |
| 1/15/2021 |
Meeting or Teleconference Held |
DEC staff met with Chevron Environmental Management Company (CEMC) and Arcadis to discuss Chevron sites located in Alaska during the Annual Portfolio Meeting on January 14th and 15th, 2021. |
Rebekah Reams |
| 5/4/2021 |
Document, Report, or Work plan Review - other |
2021 First Quarter Groundwater Monitoring event was conducted on March 23, 2021. Groundwater samples were collected from monitoring wells MW-1, MW-2 and MW-4. MW-3 could not be sampled due to the well vault being flooded and frozen over. Samples were submitted to the laboratory for GRO, DRO, RRO, and VOC analysis. Two sample containers from MW-4 were broken during shipment to the lab. GRO was detected below the reporting limit in the method blank, trip blank and equipment blank which resulted in a blank action level being established at five times of the reported blank concentration. Groundwater flow direction was to the south-southeast and depth to groundwater was 15.07 to 15.79 feet below ground surface. DRO, RRO, and chloroform exceeded cleanup levels during this monitoring event. |
Rebekah Reams |
| 8/4/2021 |
Document, Report, or Work plan Review - other |
2021 Second Quarter Groundwater Monitoring event was conducted on May 11, 2021. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, RRO, and VOC analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 14.55 to 15.25 feet below ground surface. DRO, RRO, and naphthalene exceeded cleanup levels during this monitoring event and the detection limit for chloroform exceeded the ADEC groundwater cleanup level. |
Rebekah Reams |
| 12/16/2021 |
Long Term Monitoring Workplan or Report Review |
2021 Fourth Quarter Groundwater Monitoring event was conducted on October 7, 2021. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, RRO, and VOC analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 14.40 to 15.09 feet below ground surface. DRO and RRO exceeded cleanup levels at MW-2 and chloroform exceeded cleanup levels at all wells during this monitoring event. |
Rebekah Reams |
| 6/2/2022 |
Long Term Monitoring Workplan or Report Review |
2022 First Quarter Groundwater Monitoring event was conducted on March 29, 2022. Groundwater samples were collected from monitoring wells MW-1 through MW-3. Monitoring well MW-4 was not sampled as it was frozen. Samples were submitted to the laboratory for GRO, DRO, RRO, and VOC analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 14.85 to 15.22 feet below ground surface. DRO and RRO exceeded cleanup levels at MW-2 and chloroform exceeded cleanup levels at all wells during this monitoring event. |
Rebekah Reams |
| 7/14/2022 |
Long Term Monitoring Workplan or Report Review |
2022 Second Quarter Groundwater Monitoring event was conducted on April 27, 2022. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, RRO, and VOC analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 15.04 to 15.75 feet below ground surface. DRO and RRO exceeded cleanup levels at MW-2 and chloroform exceeded cleanup levels at all wells during this monitoring event. |
Rebekah Reams |
| 9/9/2022 |
Long Term Monitoring Workplan or Report Review |
2022 Third Quarter Groundwater Monitoring event was conducted on July 6, 2022. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, RRO, and VOC analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 15.86 to 16.61 feet below ground surface. DRO and RRO exceeded cleanup levels at MW-2 and chloroform exceeded cleanup levels at all wells during this monitoring event. |
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 |
| 12/9/2022 |
Long Term Monitoring Workplan or Report Review |
2022 Fourth Quarter Groundwater Monitoring event was conducted on October 5, 2022. Groundwater samples were collected from monitoring wells MW-1 through MW-4. Samples were submitted to the laboratory for GRO, DRO, and VOC analysis. Groundwater flow direction was to the south-southeast and depth to groundwater was 15.38 to 16.14 feet below ground surface. DRO exceeded cleanup levels at MW-2 and chloroform exceeded cleanup levels at all wells during this monitoring event. |
Rebekah Reams |
| 12/23/2022 |
Offsite Soil or Groundwater Disposal Approved |
DEC approved transport of one 55-gallon drum of purge water for offsite disposal |
Rebekah Reams |
| 3/3/2023 |
Long Term Monitoring Workplan or Report Review |
DEC approved the Groundwater Sampling Reduction Request Work Plan Addendum for this site. Future groundwater monitoring completed under this approved addendum will be conducted on a semi-annual basis at monitoring wells MW-1 through MW-4 and samples will be analyzed for DRO, RRO, BTEX, chloroform, and bromodichloromethane. |
Rebekah Reams |
