| Action Date |
Action |
Description |
DEC Staff |
| 1/23/2013 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 1/23/2013 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79389 name: Benzene Contamination |
Mitzi Read |
| 2/6/2013 |
Potentially Responsible Party/State Interest Letter |
The sampling conducted at the site on December 3, 2012 identified soil contamination above cleanup levels near the soil/water interface at 9.7 feet below ground surface. The nature and extent of this contamination needs to be defined. ADEC requests a work plan by March 6, 2013, including a schedule for conducting the work, for conducting a release investigation for this contamination. This would include soil borings with at least three completed as long term monitoring wells to determine the horizontal and vertical extent of the soil and groundwater contamination that area. |
Robert Weimer |
| 2/26/2013 |
Update or Other Action |
ADEC responded to questions from the RP's consultant regarding the requested release investigation.
Soil contamination over migration to groundwater cleanup levels with strong hydrocarbon fuel odors was identified at the soil/water interface at 9.7 feet below ground surface. The monitoring wells installed for the excavation further south on the property found groundwater seasonally at 1 to 7 feet below ground surface with a groundwater flow direction to the west and southwest.
As per the DEC letter we are requesting at least 3 of the soil boring be completed as long term monitoring wells. We would also need at least 4 quarterly groundwater monitoring events to assess seasonal fluctuations in concentrations and groundwater flow direction.
Based on the soil and groundwater results, additional soil borings and monitoring wells may be needed to define the extent of the soil and groundwater contamination in that area, or the site may be closed.
|
Robert Weimer |
| 2/28/2013 |
Update or Other Action |
ADEC responded to further questions from the RP's consultant regarding the requested release investigation. ADEC has no objection to conducting the work in a phased approach and using temporary (short term) well points to help collect data to help guide where to place the long term monitoring wells in the future, but the temporary well points can't be used instead of long term monitoring wells.
ADEC recommends that they do not limit the intial work to only stepping out 15 feet in 3 directions, that if based on field reading/observations with the proposed 4 points that they have the flexibility to sample/install additional well points to help collect additional soil and groundwater data over a larger area.
As per the DEC Monitoring Well Guidance dated November 2011 it is possible to complete direct push wells as long term monitoring wells if desired.
|
Robert Weimer |
| 3/4/2013 |
Site Characterization Workplan Approved |
March 1, 2013 Additional Site Characterization Services work plan conditional approval. The work plan proposes to collect soil samples in 2 or 3 borings, to install and sample short-term monitoring wells in 3 or 4 borings, then decommission the monitoring wells. Two soil samples are to be collected from each boring, with soil and groundwater samples analyzed for BTEX, GRO, and DRO. The conditions of the approval is that in the future additional soil borings will be needed to characterize the extent of the soil contamination and long-term monitoring wells will need to be installed and sampled for a minimum of 4 quarters to define to extent of the groundwater contamination, seasonal groundwater elevation, flow direction, and to monitor groundwater contamination concentration trends. |
Robert Weimer |
| 3/7/2013 |
Site Visit |
Site visit to observe drilling and sampling of temporary monitoring wells to help assess the extent of the soil and groundwater contamination at the site. The consultant mentioned that most of the property was a former gravel pit that was filled in to bring it back to grade. |
Robert Weimer |
| 3/14/2013 |
Site Characterization Workplan Approved |
Contamination was found to extend beyond the initial borings. They plan to sample additional borings to help define the extent of the contamination. The new work plan proposes to collect soil samples in additional borings, to install and sample short-term monitoring wells in the borings, then decommission the monitoring wells. Two soil samples are to be collected from each boring, with soil and groundwater samples analyzed for BTEX, GRO, and DRO. The conditions of the approval is that in the future additional soil borings will be needed to characterize the extent of the soil contamination and long-term monitoring wells will need to be installed and sampled for a minimum of 4 quarters to define to extent of the groundwater contamination, seasonal groundwater elevation, flow direction, and to monitor groundwater contamination concentration trends. |
Robert Weimer |
| 8/27/2014 |
Update or Other Action |
Requested missing field notes for the March 2013 work. |
Robert Weimer |
| 8/28/2014 |
Document, Report, or Work plan Review - other |
Between March 7 and March 20th 2013 8 soil borings were sampled and all of them were converted to temporary monitoring wells. Groundwater was encountered between 7 to 10 feet below ground surface. The monitoring wells were sampled one time with a mini bailer then removed and filled with bentonite chips. Because a bailer was used the volatile groundwater sample results are considered as biased low. Up to 4.7 mg/kg GRO, 1,060 mg/kg DRO, 1.12 mg/kg benzene in the soil samples collected. Soil exceeded cleanup levels in in 5 of the 7 borings sampled. Up to 4.82 mg/l GRO, and 1,400 ug/l benzene (no DRO analysis) in the groundwater samples collected. Groundwater exceeded cleanup levels in 6 of 8 monitoring wells sampled. The nature and extent of the soil and groundwater contamination at this site has not been defined. Further release investigation, long-term monitoring wells, and corrective action is required. Missing field notes have been requested. |
Robert Weimer |
| 9/19/2014 |
Document, Report, or Work plan Review - other |
ADEC reviewed and requested a revised Remedial Action work plan. The proposed work plan calls for excavating the contaminated soil and treating the soil on property by landfarming, adding ORC-advanced into the base of the excavation, and collecting excavation confirmation samples. They hope to conduct the work in the fall of 2014. |
Robert Weimer |
| 10/14/2014 |
Document, Report, or Work plan Review - other |
ADEC reviewed the October 10, 2014 revised Remedial Action work plan. That revised work plan did not address all of the requested modifiactions. ADEC requests a second revised Remedial Action work plan. The proposed work plan calls for excavating the contaminated soil and treating the soil on property by landfarming, adding ORC-advanced into the base of the excavation, and collecting excavation confirmation samples. The land farm area is to be bermed with clean soil, tilled 3 to 5 times a week, and covered during extended times of precipitation or freezing weather. They hope to conduct the work in the fall of 2014. After the land farm soils have been treated the soil will be removed and the surface of the ground under/around the land farm will have field screening and laboratory samples collected in accordance with the numbers in the ADEC Field Sampling Guidance for that surface area. |
Robert Weimer |
| 10/27/2014 |
Document, Report, or Work plan Review - other |
ADEC conditional approval of October 23, 2014 revised Remedial Action work plan. The work plan proposes to excavate contaminated soil, collect characterization soil samples from the excavated soil and the sidewalls of the excavation, conduct land farm treatment of the contaminated excavated soils, add ORC-advanced to the base of the excavation, collect post-treatment soil samples from the land farm soils and land farm area, and provide a summary report. This work plan is approved under the condition that regardless of whether the two identified contaminated zones are co-mingled or not each zone needs sidewall field screening and analytical samples in accordance with ADEC May 2010 Draft Field Sampling Guidance.
ADEC requests a work plan by January 27, 2015, including a schedule for conducting the work, for installing and sampling long-term monitoring wells to help define the extent of the groundwater contamination at your site. In the future you will also need to submit a work plan for collecting field screening and confirmation soil samples from the base of the proposed excavation.
|
Robert Weimer |
| 12/5/2014 |
Update or Other Action |
ADEC response to request to reduce analysis in the areas to be over-excavated. ADEC has not received a report that includes the laboratory analytical results, chain of custody, sample receipt form, QA/QC review, ADEC QA/QC checklist, and complete copies of field notes to evaluate whether it is demonstrated that only benzene and DRO remain in the respective layers. Until further notice, as per the conditionally approved work plan all samples need to be analyzed for BTEX, GRO, and DRO, with 10 percent analyzed for PAHs. |
Robert Weimer |
| 2/12/2015 |
Update or Other Action |
Received update from RP's consultant that due to the late date of the over-excavation of contaminated soil, ORC was not placed in the excavation as planned. They plan to add ORC and mix with the base of the excavation material in May 2015 before they backfill the excavations with clean material. DEC approves and extension until June 15, 2015 to submit a work plan for the installation of long-term monitoring wells to be installed in the late summer/fall of 2015. They placed all of the impacted soil excavated in November 2014 and additional soil excavated in December 2014 into the on-site land farm. The consultant noted that one sample on the south sidewall (0.0705 mg/kg) exceeds site cleanup levels for benzene (0.025 mg/kg). |
Robert Weimer |
| 11/5/2015 |
Document, Report, or Work plan Review - other |
In November/December 2014 2,300 cubic yards (cy) of soil was excavated (900 cy was overburden soil, 80 cy was soil mixed with asphalt, and 1,320 cy was petroleum impacted soil). The petroleum impacted soil was placed in the bermed on property land farm areas for treatment. Due to freezing conditions the ORC Advanced was not put in the excavation as specified in the approved work plan. A zone of DRO contamination was identified at 4 to 7 feet below ground surface (bgs), and a zone of benzene contamination at 7 to 16 feet bgs. After the November 2014 excavation work, 12 locations still exceeded cleanup levels, so an additional 50 cy were excavated from those areas in December 2014. On December 2, 2014 the 50 cy of contaminated soil was added to the 1,270 cubic yards of contaminated soil placed in the land farm area on November 6, 2014 to bring the total to 1,320 cy. Groundwater seeps with a petroleum sheen were observed at 14 feet bgs, previously groundwater has been identified at 7 to 14 feet bgs at the site. 0.0705 mg/kg benzene remains at one location (south sidewall 11 to 12 feet bgs). The samples collected from the overburden stockpiles and the asphalt/soil stockpiles meet cleanup levels, these soils are to be used as backfill after the asphalt is removed. ORC Advanced is to be applied when the excavation is backfilled. |
Robert Weimer |
| 4/13/2016 |
Meeting or Teleconference Held |
DOWL proposes to conduct 24 geotechnical test borings across the 151 West 100th Ave site.
Since the full extent of the contamination has not been established, DEC allows backfilling with cuttings to the same depth with clean cuttings but requires that excess cuttings be individually “barreled” (contained) and can be left on-site until further notice. Any cuttings with obvious contamination (strong hydrocarbon odor, sheen in groundwater or sample, etc.), cannot be used to backfill the borings and must be individually isolated/contained and left on-site until further notice.
DEC has requested that a site map be provided prior to exploration which has been provided to ensure that the planned work does not interfere with current or planned remediation investigations/efforts. At the end of the investigation DEC is to be sent the results of the PID readings and field notes on potentially contaminated soils, including location and depths. From these materials, DEC will evaluate the disposal of contained soils from each test boring.
Test borings will not be conducted within 5 feet of an existing monitoring well. They plan to terminate any boring at the depth where any PID reading exceeds 10 ppm and notify our client. Soil will be contained as described above and equipment will be cleaned and decontaminated before proceeding to the next location. DEC is requesting copies of PID readings, boring logs, analytical sampling results (if any), and field notes (including observations on staining/odors/sheen) for all of the geotechnical borings.
|
Robert Weimer |
| 4/20/2016 |
Document, Report, or Work plan Review - other |
On September 24, 2015 the 1,320 cy of land farm soil was sampled. The original bermed land farm area covered an area of approximately 38,500 square feet with an approximate one foot lift of contaminated soil. At the time of the sampling it was discovered that the land farm soils during the tilling process had been spread out over and area of about 71,000 square feet, now with an approximate 6 inch thick lift. As per the approved work plan 132 field screening and 10 laboratory samples plus one duplicate sample were collected. The laboratory samples collected had up to 1.83 mg/kg GRO, 0.00628 mg/kg benzene, 0.0332 mg/kg benzo[g,h,i]perylene, 0.0229 mg/kg chrysene, 0.0131 pyrene, and non-detect DRO. |
Robert Weimer |
| 4/21/2016 |
Document, Report, or Work plan Review - other |
DEC comments on the January 21,2016 work plan for the sampling of 3 soil borings to be completed as monitoring wells to help define the extent of the remaining soil an groundwater contamination at the excavated area. DEC requests a revised work plan with the following revisions:
Task 1 – Need more detail on the soil sampling. This would include filling the laboratory analytical jars immediately after opening the sample core, and before placing soil in the re-sealable field screening plastic bag, the order that the laboratory sample jars will be filled, and field preservation.
Task 2 – Need to allow at least 24 hours after monitoring well development before sampling. Monitoring wells need to be purged prior to sampling. Need to document that the intake for the sampling pump is within the top foot of the water column at the time of the sampling. Groundwater sampling needs to include GRO and PAHs.
Task 4 – DEC will need to review and approve prior to disposing of any IDW (soil and water) at the site.
Task 5 – Complete copies of field notes are to be included in the report.
Task 1 and Figure 1 – Since the historic groundwater flow direction has been from the west to southwest DEC is requesting that boring/monitoring well B32 be placed to the west of the excavation instead of the south.
|
Robert Weimer |
| 4/21/2016 |
Site Visit |
Site visit to meet with RPs consultant and the property owners representative to observe current site conditions for the excavation and landfarm areas. The site visit confirmed that the landfarm soils had been spread out over an approximately 100 foot by 710 foot area during treatment. |
Robert Weimer |
| 4/22/2016 |
Document, Report, or Work plan Review - other |
DEC has reviewed the request to adjust, given the much larger landfarm area than originally proposed, the number of field screening and analytical samples proposed in the approved in the October 23, 2014 interim removal action plan. As we discussed at the site yesterday it is important to assess the entire area where the landfarm soils ended up being treated and the perimeter of that area for potential secondary contamination. Based on the landfarm sampling report the landfarm soil area ended up being approximately 100 feet wide and 710 feet long.
DEC approves the following adjustment to the field screening and analytical sampling for this site. Field screening: Every 20 feet around the perimeter of the current landfarm area, and one for every 20 foot x 20 foot area (400 square feet) beneath the current landfarm area. Analytical sampling: One analytical sample set (for BTEX, GRO, and DRO) collected at the 20 highest field screening locations, with PAH analysis and duplicate samples collected at the highest 2 field screening locations.
|
Robert Weimer |
| 4/22/2016 |
Document, Report, or Work plan Review - other |
Based on the information provided in the December 16, 2015 “Landfarm Sampling, 151 West 100th Avenue, Anchorage, Alaska” report DEC has no objection to reusing the landfarm soils on the property. The report documented that the 1,320 cubic yards of contaminated soil has been remediated to site cleanup levels in the landfarm. |
Robert Weimer |
| 5/3/2016 |
Document, Report, or Work plan Review - other |
ADEC approves April 29, 2016 revised work plan for the sampling of 3 soil borings to be completed as monitoring wells to help define the extent of the remaining soil an groundwater contamination at the excavated area. |
Robert Weimer |
| 7/7/2016 |
Document, Report, or Work plan Review - other |
ADEC provided comments on the proposed cleanup plan for the DRO contaminated area identified during the former landfarm area sampling conducted on May 3-4, 2016. ADEC requested a revised work plan. |
Robert Weimer |
| 7/14/2016 |
Document, Report, or Work plan Review - other |
ADEC conditionally approves the revised cleanup plan for the DRO contaminated area identified during the former landfarm area sampling conducted on May 3-4, 2016. The conditions include: 1. If the excavation base is larger than 50 square feet then the field screening and analytical sampling will be conducted in accordance with Table 2B of the DEC March 2016 Field Sampling Guidance.
2. For any sidewall that is over 10 square feet the field screening and analytical sampling will be conducted in accordance with Table 2B of the DEC March 2016 Field Sampling Guidance in addition to what is proposed below.
|
Robert Weimer |
| 8/15/2016 |
Offsite Soil or Groundwater Disposal Approved |
DEC approves request for disposal of 1 drum and 1 cubic yard super sack of contaminated soil to Columbia Ridge Landfill in Arlington Oregon. |
Robert Weimer |
| 8/15/2016 |
Offsite Soil or Groundwater Disposal Approved |
DEC approves treatment of 1 drum of contaminated monitoring well purge water at NRC Anchorage facility. |
Robert Weimer |
| 11/10/2016 |
Document, Report, or Work plan Review - other |
On July 19, 2016 one cubic yard of soil was excavated from the DRO contaminated area identified during the former landfarm area sampling conducted on May 3-4, 2016. The confirmation samples collected from the base and sidewall of the excavation were non-detect for DRO. Based on the information provided ADEC is not requesting any further assessment or cleanup for the former landfarm. |
Robert Weimer |
| 11/10/2016 |
Document, Report, or Work plan Review - other |
On May 13, 2016 three soil borings were sampled to help define the remaining soil contamination. Up to 0.0349 mg/kg benzene and non-detect DRO in the soil samples collected. The two down gradient soil borings were below cleanup levels. These three soil boring were completed as long term monitoring wells: MW30 (well screen 4.35 to 19.35 feet bgs), MW31 (well screen 3.61 to 18.61 feet bgs), and MW32 (well screen 4.17 to 19.17 feet bgs). |
Robert Weimer |
| 11/10/2016 |
Document, Report, or Work plan Review - other |
On May 18, 2016 the three new monitoring wells MW30, MW31, and MW32 were sampled. Up to 23.1 ug/l benzene, 1.29 mg/l DRO, 0.0818 mg/l GRO, and seven PAH's were detected but below cleanup levels (some were close to cleanup levels though). Depth to groundwater was 5.49 to 6.65 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater water samples were collected from within the screened portions of the monitoring wells. Groundwater samples were collected from the top foot of the water column with a submersible pump after purging. |
Robert Weimer |
| 2/7/2017 |
Document, Report, or Work plan Review - other |
Between April 27, 2016 and May 8, 2016 thirty-two soil borings were drilled around the property. While analytical samples were not collected, field readings were taken and field observations were noted in the field notes and boring logs. Soil boring TB-3 had elevated field readings from the ground surface to the base of the boring at 9 feet below ground surface (bgs). At the base of the boring was the highest field reading and oily soils with an asphalt/oily odor were encountered. A second soil boring was drilled 30 feet to the northwest (TB-3B) did not encounter elevated field readings or oily soils and groundwater was encountered at 11 feet bgs. Need to characterize the nature and extent of the contamination identified at soil boring TB-3. |
Robert Weimer |
| 4/26/2017 |
Document, Report, or Work plan Review - other |
DEC approves the April 6, 2017 work plan with the following modifications:
1. Document in the report and field notes that the pump intake was within the top foot of the water column at the time of the sample collection.
2. Obtain ADEC review and approval prior to discharge of purge and/or decontamination water on the site.
3. The quarterly information is to include groundwater flow direction for that event.
4. The annual report is to include a rose diagram showing the groundwater flow direction for all groundwater monitoring events, including the one conducted on May 18, 2016.
They plan to conduct quarterly groundwater monitoring of DRO, VOCs, and PAHs for 1 year. |
Robert Weimer |
| 4/27/2017 |
Document, Report, or Work plan Review - other |
DEC approves the April 14, 2017 Soil Sampling Activities work plan with the following modifications: The work plan proposes to collect two soil samples from a single 15 foot deep boring.
1. Sample jars will be filled immediately after retrieving the 5 foot sampling probe and before collecting the field screening samples. The field readings and observations will be used to determine which sample jar depth to submit to the laboratory for analysis.
2. The depth that appears most contaminated based on field readings and observations will be the one to be analyzed for the additional analytes.
3. As the volume of soil retrieved allows, a duplicate sample will also be required.
4. Complete copies of field notes will be included in the report.
5. One of the analytical samples is to be collected at the soil/water interface in the boring.
6. ADEC has no objection to conducting the requested characterization in a phased approach (just one boring initially), but additional soil and groundwater sampling will be required in this area in the future to characterize the extent of the contamination identified in this area of the site.
|
Robert Weimer |
| 6/14/2017 |
Document, Report, or Work plan Review - other |
On May 11, 2017 the three new monitoring wells MW30, MW31, and MW32 were sampled. Up to 4.16 ug/l benzene, 0.644 mg/l DRO, 0.17 ug/l 1,2-Dichloroethane, 176 ug/l Dichlorodifluoromethane, non-detect Trichlorofluoromethane, and five PAH's were detected but below cleanup levels. Depth to groundwater was 6.67 to 7.43 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater water samples were collected from the screened portions of the monitoring wells. Groundwater samples were collected from the top foot of the water column with a submersible pump after purging. |
Robert Weimer |
| 11/8/2017 |
Document, Report, or Work plan Review - other |
On May 11, 2017 a soil boring (PB1) was sampled about 1 foot away from soil boring TB-3 which had elevated field readings from the ground surface to the base of the boring at 9 feet below ground surface (bgs) when it was drilled in 2016. Two laboratory analytical soil samples were collected from boring PB1. The soil sample collected at 5-7.5 feet bgs had 23 mg/kg DRO, 39.8 mg/kg RRO, and non-detect GRO and BTEX. The soil sample collected at the soil/water interface at 9 feet bgs had 62.3 mg/kg DRO, 654 mg/kg RRO, non-detect GRO and BTEX. The detect PAHs in the sample were below cleanup levels and the detected metals appeared to be at naturally occurring concentrations. Based on the information provided DEC concurs with the consultants recommendation that additional assessment and/or cleanup activities does not appear to be warranted in the TB-3 area of the site. |
Robert Weimer |
| 11/16/2017 |
Document, Report, or Work plan Review - other |
On August 22, 2017 the three new monitoring wells MW30, MW31, and MW32 were sampled. Up to 12.8 ug/l benzene, 0.802 mg/l DRO, 0.19 ug/l 1,2-Dichloroethane, 17.7 ug/l Dichlorodifluoromethane, 0.42 ug/l Trichlorofluoromethane, and three PAH's were detected but below cleanup levels. Depth to groundwater was 3.32 to 3.94 feet below ground surface. Groundwater flow direction was to the northwest. Contamination increased in 2 of the 3 monitoring wells sampled. Groundwater water samples were collected from above the screened portions in monitoring wells MW30 and MW32. Groundwater samples were collected from the top foot of the water column with a submersible pump after purging. Since the well screens were submerged in monitoring wells MW30 and MW32 at the time of sampling the sample results from those monitoring wells may be biased low.
|
Robert Weimer |
| 11/17/2017 |
Update or Other Action |
ADEC requests that on future monitoring events that the depth to the intake of the pump be documented on the field sheet and when groundwater is shallow that the monitoring well be purged at a higher rate so that the top of the water is within the screened interval during sampling (monitoring wells MW30 and MW32 had a water above the top of screen in the August 2017 monitoring event). |
Robert Weimer |
| 3/12/2018 |
Document, Report, or Work plan Review - other |
On November 1, 2017 the three new monitoring wells MW30, MW31, and MW32 were sampled. Up to 1.78 ug/l benzene, 0.958 mg/l DRO, non-detect 1,2-Dichloroethane, 2.25 ug/l Dichlorodifluoromethane, 0.55 ug/l Trichlorofluoromethane, and two PAH's were detected but below cleanup levels. Depth to groundwater was 2.48 to 2.96 feet below ground surface. Groundwater flow direction was to the southwest. Contamination increased in 1 of the 3 monitoring wells sampled. Groundwater water samples were collected from above the screened portions of all three monitoring wells. Groundwater samples were collected from the top foot of the water column with a submersible pump after purging. Since the well screens were submerged in all of the monitoring wells at the time of sampling the sample results from those monitoring wells may be biased low. |
Robert Weimer |
| 8/29/2018 |
Offsite Soil or Groundwater Disposal Approved |
ADEC approves request to transport one drum of contaminated drill cuttings and 2 drum of contaminated purge water to Columbia Ridge Landfill in Oregon for disposal. Documentation of disposal was provided on October 2, 2018. |
Robert Weimer |
| 1/3/2019 |
Document, Report, or Work plan Review - other |
On February 22, 2018 the three new monitoring wells MW30, MW31, and MW32 were sampled. Up to 10.3 ug/l benzene, 0.558 mg/l DRO, non-detect ug/l 1,2-Dichloroethane, 49.6 ug/l Dichlorodifluoromethane, 0.59 ug/l Trichlorofluoromethane, and no PAH's were detected but this monitoring event. Depth to groundwater was 8.58 to 9.71 feet below ground surface. Groundwater flow direction was to the west by southwest. Contamination increased in 3 of the 3 monitoring wells sampled. Groundwater water samples were collected from within the screened portions of the monitoring wells. Groundwater samples were collected from the top foot of the water column with a submersible pump after purging. |
Robert Weimer |
| 1/9/2019 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79389 Benzene Contamination. |
Robert Weimer |
| 7/29/2019 |
Document, Report, or Work plan Review - other |
ADEC approved the July 29, 2019 work plan to conduct groundwater sampling for VOCs in monitoring well MW30 in August 2019 and February 2020. |
Robert Weimer |
| 3/6/2020 |
Document, Report, or Work plan Review - other |
On August 16, 2019 monitoring well MW30 was sampled in accordance with the approve groundwater monitoring work plan. The sample was analyzed for VOCs and had 51.8 ug/l Dichlorodifluoromethane (200 ug/l cleanup level) and 0.93 ug/l Trichlorofluoromethane (5,200 ug/l cleanup level). The other VOCs were non-detect. Depth to water was 7.86 feet below ground surface. Groundwater samples were collected from the top foot of the water column with a submersible pump after purging. The sample arrived over temperature (8.1 degrees C), but since it arrived at the lab 3 hours 13 minutes after sampling it does not effect the usability of the data. |
Robert Weimer |
| 3/6/2020 |
Document, Report, or Work plan Review - other |
On February 3, 2020 monitoring well MW30 was sampled in accordance with the approve groundwater monitoring work plan. The sample was analyzed for VOCs and had 42.2 ug/l Dichlorodifluoromethane (200 ug/l cleanup level) and 0.641 ug/l Trichlorofluoromethane (5,200 ug/l cleanup level). The other VOCs were non-detect. Depth to water was 9.29 feet below ground surface. Groundwater samples were collected from the top foot of the water column with a submersible pump after purging. |
Robert Weimer |
| 3/6/2020 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79389 Benzene Contamination. |
Robert Weimer |
| 4/27/2020 |
Document, Report, or Work plan Review - other |
S&W submitted a monitoring well decommissioning plan for MW30, MW31, and MW32. DEC approved the plan. |
Janice Wiegers |
| 5/22/2020 |
Document, Report, or Work plan Review - other |
Decommissioning report dated 5/6/2020 submitted. Monitoring wells 30, 31, and 32 were decommissioned. |
Janice Wiegers |
| 5/26/2020 |
Cleanup Complete Determination Issued |
DEC sent a closure letter to the responsible party. Contamination has been removed and cleanup is complete. |
Janice Wiegers |
| 5/26/2020 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Former Staff |
