| Action Date |
Action |
Description |
DEC Staff |
| 9/26/2005 |
Site Added to Database |
Brownfield tracking site. |
Deborah Williams |
| 9/26/2005 |
GIS Position Updated |
Locational data from Topozone.com, NAD 83 from site map in the DEC Brownfields Assessment Request form. |
Deborah Williams |
| 2/21/2006 |
Update or Other Action |
Draft of Phase I ESA provided to DEC for review by consultant conducting DEC Brownfield Assessment and working for DEC. Report indicates the liklihood that contamination is present and Phase 2 services warranted. |
John Carnahan |
| 3/28/2006 |
Preliminary Assessment Approved |
Phase I report completed for site. Recommendation is for confirmation or potential environmental impacts associated wtih business use. MOA intends to further assess site and will seek additional funding. |
John Carnahan |
| 3/31/2006 |
Brownfields Award |
Brownfield Confirmed: Site received DEC brownfield assessment. FY 2006 SOA CIP funds $3,436 awarded to the Municipality of Anchorage (MOA) for Phase I ESA on Peacock Cleaners. Contract # 18-9028-12. Current status: Phase I ESA indicated contamination was present and Phase II warranted.
|
John Carnahan |
| 6/20/2007 |
Update or Other Action |
Received call from ADOT contractor pertaining to Lake Otis Road widening project that may impact the frontage of the Peacock Cleaner's property. Forwarded copy of Phase I ESA to DOWL Engineers, who is working for ADOT. |
John Carnahan |
| 9/7/2007 |
Document, Report, or Work plan Review - other |
September 7, 2007 groundwater monitoring event. Up to 5.7 mg/l DRO, 8,330 ug/l PCE, 2,130 ug/l TCE, and 1.7 ug/l DCE in the groundwater. 5 of the 9 monitoring wells are nested wells that have sample intervals at 2 or 3 diffent depths. The depth to groundwater ranged between 4.5 to 15.52 feet below ground surface. The groundwater flow direction was to the westerly direction for this monitoring event. |
Robert Weimer |
| 9/26/2007 |
Update or Other Action |
Telephone call from consultant working for the Heritage Land Bank, conducting a site characterization based on the Phase I results. A workplan was completed and sent to the DEC dated September 24, 2007. Most of the preliminary site work had been completed, although the DEC requested that it be kept informed on the proposed work effort since it was likely that the MOA would seek further brownfield funding for cleanup. Initial data indicate that surface soil has been contaminated by solvents adjacent to building. There was a tank identified onsite that was not previously identified, and there is a depression to the east of the store that is filled with water, that appears to be filled with water potentially from the store. More investigation is pending. |
John Carnahan |
| 10/23/2007 |
Update or Other Action |
RP consultant informed EC that they are planning to install additional wells on the property. DEC PM requested information about the existing findings and location of wells. Through discussion the locations of the remaining two wells will be to the south and southeast of the known contaminated area. Upgradient information was available from previous investigations. |
John Carnahan |
| 10/29/2007 |
Potentially Responsible Party/State Interest Letter |
Letter of State Interest send to Mr. Washington, current owner of the Peacock Cleaners business, and Municipality of Anchorage as the land owner. |
John Carnahan |
| 1/10/2008 |
Meeting or Teleconference Held |
Teleconference with Mr. Washington and Mr. David Burney about the status of the site and the financial situation for Mr. Washington. They requested that I re-send the letter of state interest to Rev. Patterson with Mr. Washington's church. This was completed. |
John Carnahan |
| 1/15/2008 |
Update or Other Action |
Sent general information about the use of insurance archeology to potentially assist with cleanup costs to the contact information provided by Mr. Washington: the fax number at the Baptist Church that Mr. Washington attends. |
John Carnahan |
| 2/13/2008 |
Site Characterization Report Approved |
Received Site Characterization report for 4501 Lake Otis Parkway. Municipality of Anchorage contracted this effort to further evaluate specific areas of concern identified in a previously completed Phase I ESA. This work consisted of five soil borings, eleven nested monitoring wells, and three permanent monitoring wells. The results indicated that DRO was identified in soil and groundwater consistent with a release from a Stoddard solvent UST located onsite. PCE and TCE contamination identified in soil and groundwater was consistent with a surface, or near-surface release originating onsite. The highest soil concentrations were identified in a boring located directly adjacent to the dry cleaning facility. Groundwater was impacted in excess of the DEC cleanup levels beneath the site. Groundwater samples collected from the offsite monitoring wells did not contain detectable PCE or TCE - however, the report implied that there may be a semi-confining layer between aquifers or a perched aquifer. Samples from the offsite wells were presumably from the uppermost aquifer. The extent of the groundwater plume has not been fully delineated. A hazardous materials survey conducted on the structures identified asbestos-containing materials, lead PCBs (associated with light fixtures), mercury and other hazardous containing materials, which will require removal prior to demolition activities. Soil contamination up to 2,140 mg/kg DRO, 45.2 mg/kg PCE, and 0.907 mg/kg TCE in the areas sampled. Groundwater contamination up to 5.77 mg/l DRO, 8,300 ug/l PCE, 2,130 ug/l TCE, 1.7 ug/l DCE, and 3,540 ug/l cis-1,2 DCE. Depth to groundwater was measured between 4.86 (shallow) to 13.5 (medium) to 15.52 feet below ground surface (bgs) in the deep wells. In the temporary nested monitoring wells the highest concentration was found at the medium 13.13 feet bgs. The three permanent monitoring wells (B6MW, B7MW, B8MW) installed off property to the south appear to have been installed in the shallow (less/non-contaminated) aquifer. Nested monitoring wells were installed on property (B1MW, B2MW, B3MW, B4MW, B5MW). A silt layer was encountered at 25 feet bgs in boring B3, the other deep borings did not encounter this silt layer at 25 to 26.5 feet bgs. |
John Carnahan |
| 2/15/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed.
Human Health Exposure Category: Current Exposure;
Controlling Pathway(s): Surface Soil, Subsurface Soil;
Score: 8;
Ecological Site Exposure Category: Low Potential Exposure; Potentially-Contaminated Media: Surface Soil, Groundwater, Subsurface Soil, Surface Water;
Other Site Concerns: None
|
John Carnahan |
| 5/1/2008 |
Brownfields Award |
Site to receive EPA Targeted Brownfield Assessment, whereby EPA contractor will conduct further site characterization. |
John Carnahan |
| 5/1/2008 |
Document, Report, or Work plan Review - other |
On 5/1/08 Chevron sampled monitoring wells on and near the Peacock Cleaners property. The monitoring wells (MW16 and MW17) on the Peacock Cleaners property had up to 34.6 ug/l TCE, 197 ug/l PCE, 102 ug/l cis-1,2-Dichloroethene, and non-detect benzene. The off property monitoring well (MW9) just north the Peacock Cleaners property had up to 50 ug/l TCE, 270 ug/l PCE, 119 ug/l cis-1,2-Dichloroethene, and non-detect benzene. |
Robert Weimer |
| 5/16/2008 |
Update or Other Action |
Received conceptual plan for future assessment associated wtih Targeted Brownfield Assessment, to be completed by E&E, working under EPA. |
John Carnahan |
| 7/1/2008 |
Update or Other Action |
The MOA was awarded an EPA Brownfield Cleanup grant for this site. Field work will likely commence during 2009 summer field season at earliest. |
John Carnahan |
| 7/15/2008 |
Document, Report, or Work plan Review - other |
On 7/15/08 Chevron sampled monitoring well near the Peacock Cleaners property. The off property monitoring well (MW9) just north the Peacock Cleaners property had up to 43 ug/l TCE, 210 ug/l PCE, 97 ug/l cis-1,2-Dichloroethene, and non-detect benzene. This is a decrease from the previous monitoring event. Depth to groundwater was 15.27 feet below ground surface. |
Robert Weimer |
| 9/9/2008 |
Update or Other Action |
EPA approved the quality assurance plan and field sampling plan. Some comments by DEC QAO pertaining to methanol preservation, but they were discussed and resolved since the samples were to be analyzed rapidly. |
John Carnahan |
| 9/10/2008 |
Document, Report, or Work plan Review - other |
DEC provided comments on the proposed assessment workplan. |
John Carnahan |
| 9/16/2008 |
Update or Other Action |
Clarification on sampling methods provided by EPA on holding times. See email or file for corespondence on methanol preservation. |
John Carnahan |
| 9/19/2008 |
Site Visit |
At the request of the project manager the quality assurance officer completed site visits to ensure work plan compliance at the former Peacock Cleaners during September of 2008. Soil sample collection, monitoring well installation using direct push technology, and groundwater sample collection were all observed on site. No deviaitons from the approved workplan were noted. |
Brenton Porter |
| 9/22/2008 |
Site Visit |
DEC QAO made a site visit to observe sampling during the field effort. The specific day is not known, but he contacted the PM to inform him that he would be onsite to observe sampling methods. |
John Carnahan |
| 10/13/2008 |
Update or Other Action |
The MOA is working on its Brownfield Grant Workplan and has requested review. DEC provided comments on the workplan, which is not a corrective action plan. |
John Carnahan |
| 10/23/2008 |
Update or Other Action |
Project management changed from John Carnahan to Robert Weimer. |
John Carnahan |
| 5/14/2009 |
Document, Report, or Work plan Review - other |
On 5/14/09 Chevron sampled monitoring well near the Peacock Cleaners property. The off property monitoring well (MW9) just north the Peacock Cleaners property had up to 25 ug/l TCE, 97 ug/l PCE, 64 ug/l cis-1,2-Dichloroethene, and non-detect benzene in the groundwater. This is a decrease from the previous monitoring event. Depth to groundwater was 16.37 feet below ground surface. |
Robert Weimer |
| 6/17/2009 |
Document, Report, or Work plan Review - other |
On September 15, 2007 through September 24, 2007 soil and groundwater samples were collected to help assess for solvent contamination at this site. The following contaminated areas were identified: partially buried drum area, stoddard solvent container storage area, Stoddard solvent underground storage tank area, former Peacock Cleaners structure area, and septic leach pond area (only 3 surface field screening samples and 1 deeper sample set collected). The former residence drum area does not appear to have been adequately assessed (samples were not collected in area next to house where drums were identified in 2007). 14 monitoring wells were sampled. Depth to groundwater was 16 to 18 feet below ground surface (bgs). The groundwater flows to the south to southeast toward the nearby Campbell Creek. Groundwater contamination up to 2.4 mg/l DRO (1.5 mg/l cleanup level), 320 ug/l benzene (5 ug/l cleanup level), 10,762 ug/l tetrachloroethene (PCE) (5 ug/l cleanup level), 1,171 ug/l trichloroethylene (TCE) (5 ug/l cleanup level), 7,243 ug/l cis-1,2 Dichloroethane (DCE) (70 ug/l cleanup level), and 6.8 ug/l 1,2-Dichloropropane (5 ug/l cleanup level). PCE and TCE exceeded cleanup levels in 10 groundwater samples. Soil contamination up to 5,500 mg/kg DRO (250 mg/kg cleanup level), 3.3 mg/kg benzene (0.025 mg/kg cleanup level), 34,000 mg/kg PCE (0.024 mg/kg cleanup level), 3.8 mg/kg TCE (0.024 mg/kg cleanup level), and 20.4 mg/kg DCE (0.24 mg/kg cleanup level). PCE exceeded cleanup levels in 31 samples. The full extent of the soil and groundwater contamination has not been defined. Need additional nested and deeper monitoring wells to assess for DNAPL product and depth to a confining layer. Also need to assess the former leach field and septic tank for contamination. A tighter silt layer was encountered at 18.5 feet bgs in boring PS02 & PS03, 17 feet bgs PS04, and 17.5 feet bgs at PS05, PS08, SP11, & SP12. The consultant estimates that 5000 cubic yards of contaminated soil remain at this site above cleanup levels. |
Robert Weimer |
| 8/12/2009 |
Update or Other Action |
File review. The follow additional site work is needed:
Remove the drums, liquids, and waste from the buried drum area.
Remove any liquids in the stoddard solvent UST tank, and remove and assess the stoddard tank and piping.
Assess building discharge piping and where it goes to (old septic crib/septic tank/leach field).
Define the full extent of soil contamination (including additional assessment at former residence drum area, septic leach pond, and buried drum area).
Define the full extent of groundwater contamination.
Quarterly groundwater monitoring.
Install additional nested monitoring wells to assess for DNAPL product and deeper groundwater contamination.
Corrective action plan for the soil and groundwater contamination.
Vapor intrusion assessment for the apartment building to the south and any other nearby structures.
|
Robert Weimer |
| 8/26/2009 |
Site Visit |
Walked around the outside of the site to observe current site conditions. The site is fenced, but most of the east side has been pushed down, some trash was observed inside the fenced area. The stand pipes for the stoddard tank were visible from the south. Site conditions appear simular to the 2008 photos in the June 2009 Targeted Brownfields Assessment report. |
Robert Weimer |
| 8/26/2009 |
Document, Report, or Work plan Review - other |
On 8/26/09 Chevron sampled monitoring well near the Peacock Cleaners property. The off property monitoring well (MW9) just north the Peacock Cleaners property had up to 36 ug/l TCE, 200 ug/l PCE, and non-detect for benzene and cis-1,2-Dichloroethene in the groundwater. This is an increase from the previous monitoring event. Depth to groundwater was 15.61 feet below ground surface. |
Robert Weimer |
| 8/27/2009 |
Meeting or Teleconference Held |
Teleconference with EPA, DEC, MOA, and MOA's consultant. EPA has issued a Brownfield Cleanup Grant for this site. The amount is $240,000 ($200,000 from EPA and a matching $40,000 from MOA). EPA indicated that other grant money may be available that may require more matching money. MOA indicated that more matching money was not available at this time. I informed MOA of the pushed down fence I observed on 8/26/09 and they said they would get that fixed. We discussed that the site characterization was not complete, buried tanks and drums would need to be removed, a vapor intrusion assessment needs to be conducted, and ongoing groundwater monitoring is needed. EPA was not sure that all of those items could be covered under the Brownfield Cleanup Grant, but would check to see if other grants are available to cover needed site work that could not be done under the current grant. DEC requested a copy of the drinking water well search that was to be done under the previous grant. MOA stated that they intend to use the western 20 feet of the property for the road and the rest of the property is planned to be used for residential/commercial. |
Robert Weimer |
| 8/27/2009 |
Update or Other Action |
Following the 8/27/09 teleconference DEC received a copy of the November 18, 2008 Brownfields Cleanup Cooperative Agreement Work Plan. The plan proposes to spend $240,000 on the site ($200,000 from the EPA and $40,000 from MOA). The plan proposes to spend an estimated $57,600 to remove the stoddard tank and buried drums, $103,400 for treatment of contaminated soil, and $30,400 for treatment of contaminated groundwater. The plan includes public involvement, Analysis of Brownfields Cleanup Alternatives (ABCA), and cleanup design. |
Robert Weimer |
| 9/10/2009 |
Meeting or Teleconference Held |
Meeting with MOA and their consultant to discuss future site work. They plan to have the stoddard solvent tank pumped out and buried drums removed soon. Groundwater monitoring also needs to continue. The MOA will be looking for funds to do the short-term work. |
Robert Weimer |
| 10/21/2009 |
Meeting or Teleconference Held |
Teleconference with Terri Griffin of EPA. EPA is having their contractor conduct a 1 mile drinking water well search of the area and check the screened intervals in the downgradient site monitoring wells. They are also evaluating the costs and funding to conduct a vapor intrusion assessment for the nearby apartment building. Terri said that the MOA is moving forward with the Brownfields Cleanup Cooperative Agreement Work Plan which includes public involvement, Analysis of Brownfields Cleanup Alternatives (ABCA), and cleanup design. She said the cleanup design would have to meet State and Federal cleanup requirements even if that would exceed the $240,000 grant. Terri indicated that the MOA or the State could apply in 2010 for up to $350,000 of additional grant money (issued in 2011) under the Site Specific Assessment Proposal, and no match money is required for this competitive grant. EPA also hopes to have money available so the half buried drums can be removed before freeze up this year, and so the stoddard tank can be pumped out and the monitoring wells sampled this fall. |
Robert Weimer |
| 4/20/2010 |
Document, Report, or Work plan Review - other |
On 4/20/10 Chevron sampled monitoring well near the Peacock Cleaners property. The off property monitoring well (MW9) just north the Peacock Cleaners property had up to 44 ug/l TCE, 280 ug/l PCE, 130 ug/l cis-1,2-Dichloroethene, and non-detect benzene. This is an increase from the previous monitoring event. Depth to groundwater was 15.60 feet below ground surface. |
Robert Weimer |
| 7/29/2010 |
Update or Other Action |
The Municipality of Anchorage (MOA) submitted a Draft Analysis of Brownfields Cleanup Alternatives (ABCA) for the former Peacock Cleaners property located at 4501 Lake Otis Parkway in Anchorage, Alaska. The MOA was awarded a U.S. Environmental Protection Agency (EPA) Brownfields Cleanup Grant in 2008 to address ontamination issues at the former Peacock Cleaners site. The proposed scope of services included evaluating remedial alternatives to facilitate site re-use and redevelopment. |
Robert Weimer |
| 7/30/2010 |
Document, Report, or Work plan Review - other |
DEC provided comments on the comments on the draft Analysis of Brownfields Cleanup Alternatives (ABCA).
4.2 The contaminants of concern need to include BTEX, GRO, and PAHs for the stoddard solvent and vinyl chloride for the other solvents.
4.3.2 The extent of the groundwater contamination at this site has not been fully defined. With the concentrations detect near the southern property line it is likely that contamination extends off property in that direction.
4.4.2 The last paragraph should reference 18 AAC 75.350.
4.4.4 The apartment building to the south is within 100 feet of the contamination indentified at this site. A vapor intrusion evaluation will need to be done.
4.5 As we have discussed in the past there are other groundwater contamination data gaps in addition to the southwest corner.
4.5 Additional data gaps include: The former resident drum storage area, the septic leach pond, deeper groundwater, and DNAPL evaluation.
4.5 Vapor intrusion is a current potential risk. A vapor intrusion evaluation will need to be done.
5.2 The migration to groundwater cleanup standard for DCE is 240 ug/kg.
5.2 The contaminants of concern need to include BTEX, GRO, and PAHs for the stoddard solvent and vinyl chloride for the other solvents.
5.3 Please clarify or remove the “magnitudes less than” statement in the first paragraph.
6.2 All of the alternatives would require some form of institutional control until such time that soil and groundwater is demonstrated to meet cleanup levels. Groundwater monitoring for all of the options would need to be quarterly initially and would at least initially be required in more than 5 monitoring wells. Also the groundwater monitoring would probably be required longer than the 5 or 10 years estimated. Confirmation soil sampling would be required in all of the options.
6.2.1 Even if no cleanup action is taken, additional assessment and monitoring would be required. Also the cost of the monitoring would be much greater than the other alternatives that remove and/or actively treat the contamination. The no cleanup action monitoring would be expected for 30+ years, so the cost of no cleanup action would be higher than some of the other alternatives.
6.2.2 Last paragraph should specify the sampling frequency, number of wells, and analysis. The estimated cost may need to be adjusted to meet site monitoring requirements.
6.2.3 The mounded soil has not been characterized whether it is hazardous waste or not.
6.2.6 Site cleanup goals to just outdoor inhalation cleanup criteria are not approved. The final goal should be default cleanup levels, or more stringent if necessary to protect human health and the environment. Surface impacted soils would also need to be treated.
6.3 Given the concentration in the soil and groundwater at this site Alternative 3 would not be an acceptable option to DEC, active treatment and/or source removal is required.
Table 1 and Table 2 need to be revised based on the comments above.
The Human Health Conceptual Site Model check list and form need to be updated to include missing current and potential pathways such as Dermal Absorption of Contaminants from Soil.
|
Robert Weimer |
| 9/10/2010 |
Document, Report, or Work plan Review - other |
DEC receives copy of E&E's drinking water well search conducted in May of 2009. The report identified 4 water wells within a mile radius of the site, at 0.4 miles to the NE, 0.9 miles to the NE, SW, and SW. From the well logs they are drawing water from the base of each well at between 63 and 142 feet below ground surface. |
Robert Weimer |
| 10/11/2010 |
Site Visit |
Site visit found that portions of the east fence were down. Discussed with property owner (MOA) the need to fix the fence and put up signs. |
Robert Weimer |
| 10/13/2010 |
Update or Other Action |
Property owner (MOA) informed me that the fence had been fixed and signs would be put up within a week. She also informed me that the adjacent property owner to the east had placed some excavated soil over the property line. All but 2 or 3 inches were removed and field screening readings will be taken on the remainings soils. |
Robert Weimer |
| 10/19/2010 |
Meeting or Teleconference Held |
Teleconference with EPA to discuss the October 8, 2010 application by the Municpality of Anchorage for an EPA Area of Contamination (AOC) concept for this site. EPA will be drafting a letter responding to the request. |
Robert Weimer |
| 10/25/2010 |
Site Visit |
Site visit on 10/22/10 found that portions of the east fence were still down. Discussed with property owner the need to fix the fence. Some signs had been put up on the fencing. |
Robert Weimer |
| 10/26/2010 |
Meeting or Teleconference Held |
Meeting with Municipality of Anchorage (MOA) to discuss future site work. The fence on the east side will be repaired soon and warning signs will be put up on all 4 sides of the property. MOA will talk with Chevron to determine who will be responsible for the monitoring of the Chevron monitoring wells MW-9, MW-17, and MW-18 which have had solvent contamination in the past. MOA will have their consultant submit a workplan soon for the removal of the stoddard solvent tank and the buried drums. We discussed that the drinking water well may have been abandoned in 2005. |
Robert Weimer |
| 12/6/2010 |
Site Visit |
Site visit to observe the removal of the 2000 gallon stoddard solvent tank. During the removal a 300 gallon tank full of liquid and sludge was found next to the south side of the 2000 gallon tank. Samples were collected to characterize the liquid in the 300 gallon tank that has been pumped into drums which are currently stored on the site. There are still some gaps in the property fence on the east side that need to be fixed. Additional warning signs had been put up. |
Robert Weimer |
| 12/7/2010 |
Site Visit |
Site visit to observe stockpile sampling and the removal of the piping associated with the 2000 gallon stoddard solvent tank and the 300 gallon tank that was found next to the south side of the 2000 gallon tank. The consultant said that in the tank excavation they had heated head space readings of 3000 ppm and that the vapors were so strong in the tank excavation that they had to wear respirators. There are still some gaps in the property fence on the east side that need to be fixed. They plan to do the piping trench sampling and backfill the excavations with the excavated soil on 12/8/10. |
Robert Weimer |
| 12/8/2010 |
Site Visit |
Sundet inspected the site on 12/8/10 in follow up to Weimer's inspections the prior days. Jake of S&W was on site sampling the excavation where the two USTs were removed the past several days. One PVC pipe was observed that had been installed in the middle of the property which Jake was uncertain of its purpose, e.g, whether its a sanitary sewer cleanout for the prior bldg. on site or some type of environmental monitoring tube. Sundet informed Matt Hemry of S&W of the pipe and he later inspected but also could not determine its purpose at that time. |
Rich Sundet |
| 12/15/2010 |
Document, Report, or Work plan Review - other |
DEC receives notification that the liquids from the 300 gallon tank tested as an F-listed hazardous waste for solvents. The liquids and sludge from that tank are to be transported by Emerald to US Ecology in Grand View, Idaho a Subtitle C and TSCA Landfill.
|
Robert Weimer |
| 12/15/2010 |
Update or Other Action |
DEC requests that the UST Site Assessment reports and copies of field notes be submitted within 60 days of the tanks removal which occured on 12/6/10. |
Robert Weimer |
| 12/21/2010 |
Update or Other Action |
Call from consultant some mystery drums have shown up within the fenced area. They are investigating where they came from. We discussed improving site security. They plan to have the site fence repaired so it does not have gaps and have the gates pad locked by 12/23/10. |
Robert Weimer |
| 12/27/2010 |
Update or Other Action |
DEC received notification on 12/23/10 that the fence around the site has been secured. |
Robert Weimer |
| 12/28/2010 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75120 Source area SE Corner of the dry cleaning building. Updated to reflect current site conditions including removal of on-property structures and fencing the property. |
Robert Weimer |
| 1/20/2011 |
Meeting or Teleconference Held |
Teleconference with EPA, DEC, MOA, and their consultant to discuss the current site status and future site work. I revised Draft Analysis of Brownfields Cleanup Alternatives (ABCA) is to be submitted to DEC and EPA once MOA hears from EPA as to what level of contamination they would need to treat excavated soil to without needing to put it in a lined leachate collected cell. |
Robert Weimer |
| 2/24/2011 |
Meeting or Teleconference Held |
Teleconference with EPA and DEC to discuss the current site status and future site work. EPA determined that excavated soil treated ex-situ would need to be treated to ADEC migration to groundwater cleanup levels so it would not need to be put it in a lined cell with leachate collection. We discussed that contaminated soil could be excavated and consolidated on the property and then treated in the ground to other cleanup levels. We discussed that there will need to be other site work (such as long term groundwater monitoring, vapor intrusion assessment, release investigation work),that may not be funded under the Brownfields grant. |
Robert Weimer |
| 3/1/2011 |
Meeting or Teleconference Held |
Teleconference with EPA, DEC, MOA, and their consultant to discuss the current site status and future site work. I revised Draft Analysis of Brownfields Cleanup Alternatives (ABCA) is to be submitted to DEC and EPA soon. Work is to be done this summer. EPA determined that excavated soil treated ex-situ would need to be treated to ADEC migration to groundwater cleanup levels so it would not need to be put it in a lined cell with leachate collection. We discussed that contaminated soil could be excavated and consolidated on the property and then treated in the ground to other cleanup levels. We discussed that there will need to be other site work (such as long term groundwater monitoring, vapor intrusion assessment, release investigation work),that may not be funded under the Brownfields grant. |
Robert Weimer |
| 4/19/2011 |
Document, Report, or Work plan Review - other |
On December 6, 2010 a 2,000 gallon stoddard solvent tank and its associated piping were removed. During the removal a 300 gallon tank full of liquid and sludge was found next to the south side of the 2,000 gallon tank. These tanks were located near the southern property boundary. Soil samples were collected from the tank and piping excavations and from the excavated soil. The excavated soil was approved to be put back in the area where it was excavated. Up to 2,090 mg/kg GRO, 12,800 mg/kg DRO, 0.0702 mg/kg benzene, 4,520 mg/kg PCE, 111 mg/kg TCE, and non-detect (<0.0308 mg/kg) Vinyl Chloride. Some of the TCE sample results may be biased low because some samples were analyzed outside of holding times. The three samples collected from the tank excavation met default cleanup levels for PAHs. All areas sampled exceeded default cleanup levels for solvents. The base of the tank excavation was 9 feet below ground surface. |
Robert Weimer |
| 4/28/2011 |
Update or Other Action |
ADEC provided comments to EPA on the April 2011 ABCA for the Former Peacock Cleaners.
Whole document– Use the term on-property instead of on-site. Use the term off-property instead of off-site.
4.2 The contaminants of concern need to include potentially PAHs (the highest DRO sample {S34} was not analyzed for PAHs) for the stoddard solvent, and for vinyl chloride for the other solvents.
4.3.1 The contaminants of concern need to include potentially PAHs (the highest DRO sample {S34} was not analyzed for PAHs) for the stoddard solvent, and for vinyl chloride and cis-1,2-DCE for the other solvents.
4.3.2 The extent of the groundwater contamination (chlorinated and Stoddard Solvent) at this site has not been fully defined. Groundwater solvent and DRO contamination has also been found in monitoring wells to the north of the property. With the concentrations detect near the southern property line it is likely that contamination also extends off property in that direction. Figure 2 estimates that DRO soil contamination extending off-property to the south. The depth to groundwater was as shallow as 4.86 feet below ground surface in 2007.
4.4.2 The groundwater flow direction has ranged from the northwest to southeast directions, so we can‘t say that any of the monitoring wells are always upgradient or cross-gradient given the seasonal/area fluctuations in groundwater flow direction at this site.
4.4.4 Vapor intrusion assessments are needed for both future on-property structures and current/future off-property structures.
4.5 As we have discussed in the past, the data gaps include the drum storage area near the former residence and vapor intrusion for off-property structures.
5.1 Deleted the line “ The ADEC grants a Cleanup Complete status when remedial efforts reduce concentrations of COCs in the impacted media to magnitudes less than the most stringent cleanup criteria.”
5.2 Change to: EPA will be involved with regulatory determinations.
5.3.1 ADEC Cleanup Levels: The contaminants of concern need to include PAHs for the stoddard solvent and vinyl chloride for the other solvents.
5.3.1 EPA Cleanup Levels: Are the UTS for PCE, TCE, and DCE been set at 6,000 ug/kg for this site?
5.3.1 EPA Cleanup Levels: ADEC is not aware of any interim concentration reduction thresholds for the site COCs have been established. Please clarify or delete.
5.4 (Second paragraph) Groundwater solvent and DRO contamination has also been found in monitoring wells to the north of the property. Also the drum storage area near the former residence has not been adequately characterized.
6.1 & 6.2 All of the alternatives would require some form of institutional control until such time that soil and groundwater is demonstrated to meet cleanup levels. Confirmation soil sampling would be required in all of the options. A period of groundwater monitoring would be required in all of the options. All alternatives need include an estimate of the costs beyond what is covered under this grant. For example because Alternative 1 & 2 include no active treatment/source removal, groundwater and site monitoring would be much longer (expected for 30+ years) than the other alternatives (expected 5 to 10 years), so the total cost of Alternative 1 & 2 would be higher than the other alternatives. For Alternative 1 there would also be the loss of revenue in reusing the site, and for Alternative 2 the loss of revenue for additional length of time with limits on reuse on the site.
6.2 Given the concentration in the soil and groundwater at this site Alternatives 1 & 2 would not be an acceptable option to ADEC, active treatment and/or source removal is required.
6.2 (All of the Alternatives): Vapor intrusion assessments are needed for both future on-property structures and current/future off-property structures.
6.2.4 & 6.2.5 & 6.2.6 More than 5 push probes will be needed to collect final confirmation samples at the site. That number may be used to check the progress of the remediation, but for final confirmation samples more than that will be needed. The plan estimates over 600 cubic yards of soil are contaminated above default cleanup levels. For a stockpile that size a minimum of 60 field screening and 13 analytical samples would be required.
6.2.6 & 6.2.7 ADEC is not aware that any target cleanup thresholds for the site COCs have been established. Please clarify or delete. The final goal should be default cleanup levels, or more stringent if necessary to protect human health and the environment. Surface impacted soils would also need to be treated. |
Robert Weimer |
| 4/28/2011 |
Update or Other Action |
ADEC provided comments to EPA on the April 2011 ABCA for the Former Peacock Cleaners.
Table 1: For all of the alternatives IC’s would be required.
Table 1: There should be a column for estimated “other costs” outside of the grant, including estimated lost revenue in use of the property because of a longer cleanup time. There should also be a column for the total estimated costs (grant costs + other costs). This is the only way to evaluate the true cost of each alternative. Alternative 1 would probably mean 30+ years of monitoring and reporting with lost revenue for that period of time since most of the site could not be reused at all. Alternative 2 would also probably have 30+ years of monitoring and reporting, with most of the site reused for parking, but still lost revenue because of limits on building structures on most of the property. Most of the other Alternatives would probably reduce the monitoring to less than 10 years, and allow earlier and more complete reuse of the property, and much less lost revenue.
Table 1: All Alternatives would require confirmation soil sampling at sometime in the future.
Table 2: Alternative 2 would have some O&M costs associated with periodically inspecting, maintaining, and reporting on the condition of the asphalt cap.
Table 2: Alternative 5 would have some O&M costs associated with periodically monitoring and reporting on the passive SVE system.
Figures 3 & 4 – Need to show groundwater flow direction for those monitoring events.
The Human Health Conceptual Site Model check list and form need to be updated to include missing current and potential pathways such as Dermal Absorption of Contaminants from Soil, Dermal Absorption of Contaminants in Groundwater, and Inhalation of Volatile Compounds in Tap Water. The media box for surface water should be checked. The transport mechanism for groundwater volatilization should be checked.
|
Robert Weimer |
| 4/28/2011 |
Document, Report, or Work plan Review - other |
December 2010 groundwater monitoring event. Up to 40.9 mg/l DRO, 94.7 ug/l PCE, 134 ug/l TCE, and 3.3 ug/l DCE in the groundwater. Sample results may be biased low due to failure to preserve some samples and bubbles in some sample bottles. Contaminant concentrations increased in 4 of the 13 monitoring wells/intervals sampled. 5 of the 9 monitoring wells are nested wells that have sample intervals at 2 or 3 different depths. The depth to groundwater ranged between 4.13 to 18.16 feet below ground surface. The groundwater flow direction was to the northwest for this monitoring event. |
Robert Weimer |
| 5/3/2011 |
Update or Other Action |
EPA provided combined EPA and ADEC comments on the April 2011 ABCA for the Former Peacock Cleaners. The MOA is to provide an updated ABCA based on the comments. |
Robert Weimer |
| 6/9/2011 |
Site Visit |
Site visit to observe the removal of the buried drums. Three drums were found, one of which still contained an unknown liquid. Confirmation soil samples were collected. Discussed with consultant that the site fencing was not secure, they said they would inform MOA. |
Robert Weimer |
| 7/20/2011 |
Site Visit |
Site visit to check on the current condition of the site. Site fencing was not secure, there was a gap on the middle north side and large gaps on the east side. Sent message to MOA and their consultant. |
Robert Weimer |
| 7/26/2011 |
Document, Report, or Work plan Review - other |
After consultation with EPA and receiving the the flash point results ADEC approves request to transport and treat at Emerald the 10 gallons of liquid that was contained in the one drum that still had liquid in it from the buried drum area. A total of 3 drums were recovered on June 4, 2011. |
Robert Weimer |
| 8/5/2011 |
Document, Report, or Work plan Review - other |
ADEC provided comments on the July 2011 Draft Quality Assurance Project Plan. The work plan proposes to excavate contaminated soil, consolidate the soil within the AOC, collect characterization samples, treat 550 to 600 cubic yards of the most-heavily impacted source area soils with chemical oxidation and in-situ passive vapor extraction, collected confirmation samples after a period of treatment, and provide a report documenting the site work. |
Robert Weimer |
| 8/9/2011 |
Meeting or Teleconference Held |
Teleconference with ADEC, EPA, and MOA's consultant to discuss ADEC and EPA's comments on the July 2011 Draft Quality Assurance Project Plan. The work plan proposes to excavate contaminated soil, consolidate the soil within the AOC, collect characterization samples, treat 550 to 600 cubic yards of the most-heavily impacted source area soils with chemical oxidation and in-situ passive vapor extraction, collected confirmation samples after a period of treatment, and provide a report documenting the site work. MOA's consultant will provide a revised plan by the end of the week.
|
Robert Weimer |
| 8/11/2011 |
Document, Report, or Work plan Review - other |
ADEC provided comments on the draft Decision Document for the Peacock Cleaners Site Analysis of Brownfields Cleanup Alternatives in addition to the EPA comments. The RP's consultant is going to revise the document based on the comments. |
Robert Weimer |
| 8/18/2011 |
Document, Report, or Work plan Review - other |
After discussions with EPA, ADEC provided comments on the August 2011 Quality Assusrance Project Plan in a letter. The letter also requests a work plan for conduction a vapor instrusion assessment for the buildings to the south and east by October 1, 2011. |
Robert Weimer |
| 8/19/2011 |
Update or Other Action |
MOA notifies ADEC that because of budgeting planning issues, the submittal of requested vapor intrusion work plan will be delayed. ADEC reminded MOA that the need for a vapor intrusion assessment, ongoing groundwater monitoring, and additional release investigation back on August 27, 2009. ADEC thanked MOA for conducting the groundwater monitoring in 2010, the Stoddard tank removal in 2010, and the drum removal in 2011. ADEC again requests that the vapor intrusion assessment work plan be submitted by October 1, 2011 as the costs of producing a work plan should be minimal. ADEC noted that the additional release investigation work, groundwater monitoring, and vapor intrusion assessment are critical in being able to evaluate the Peacock Cleaners property for reuse. |
Robert Weimer |
| 8/26/2011 |
Document, Report, or Work plan Review - other |
ADEC provided comments on the revised August 2011 Quality Assusrance Project Plan. Some of the comments from the DEC August 18, 2011 letter weren’t fully addressed as requested in the revised plan. ADEC had the comments on this plan and requested a final revised plan addressing these comments:
4.2 Modifications to the approved plan will require prior agency notification and approval.
5.3 Delete the word clean associated with <1 ppm on the OVM. Soil can still be contaminated even with field readings <1 ppm. Soil with any visible contamination, solvent/fuel odor, sheens, or field readings over ambient air would be considered potentially contaminated and not be placed into groundwater.
5.6 Delete the word clean associated with <1 ppm on the OVM. If groundwater is encountered in the excavation only soil from the AOC without any visible contamination, solvent/fuel odor, sheens, or field readings over ambient air (not the <1 ppm proposed) can be placed in the base of the excavation in contact with the groundwater.
6.3 If additional aliquots of the methanol preservative need to be added to the jar to keep the soil submerged they need to be added immediately and before other additional composite portions are added.
|
Robert Weimer |
| 9/6/2011 |
Update or Other Action |
ADEC received notification that during the excavation work to contruct the treatment cell a concrete injection well vault was found beneath the former drycleaner building and a log crib was would near the southeast corner of the excavation. Visibly contaminated soil with high field readings and a solvent odor were encountered at the log crib area. They plan to remove the crib & vault, collect confirmation samples from those areas, and remediate the excavated contaminated soil in the proposed treatment cell. |
Robert Weimer |
| 9/6/2011 |
Site Visit |
Site visit to observe excavation work to construct the treatment cell and removal of a concrete injection well vault that was found beneath the former drycleaner building and a log crib was would near the southeast corner of the excavation. Visibly contaminated soil with high field readings and a solvent odor were encountered at the log crib area. They plan to collect confirmation samples from those areas, and remediate the excavated contaminated soil in the proposed treatment cell. |
Robert Weimer |
| 9/9/2011 |
Site Visit |
Site visit to observe beginning contruction of the treatment cell. The higher field reading soils are being placed in the initial deeper lifts. |
Robert Weimer |
| 9/14/2011 |
Site Visit |
Site visit to observe contruction of the treatment cell. Remediation piping has been installed and they had only one more lift to complete. The <5 ppm PID soils are being used for the top lift and cover of the treatment cell. The higher field reading soils were placed in earlier deeper lifts. |
Robert Weimer |
| 10/19/2011 |
Update or Other Action |
ADEC receives notification that the gap in the fence has been fixed. |
Robert Weimer |
| 10/20/2011 |
Document, Report, or Work plan Review - other |
ADEC approves BGES’s October 11, 2011 Work Plan For Completion of ADEC-Required Building Inventory and Indoor Air Sampling Questionnaires. The work plan proposes to obtain access to the adjacent properties to the south and east, conduct a building inventory and indoor air sampling questionnaire form for each building, and prepare a summary report with conclusions and recommendations for continued vapor assessment activities. The work is scheduled to be completed by the end of February 2012. |
Robert Weimer |
| 3/7/2012 |
Update or Other Action |
Update from MOA's consultant that they and the MOA are still working on getting site access from the apartment complex for vapor survey/vapor assessment on that property, so the submittal of the report/plan may be delayed until April 20, 2012. |
Robert Weimer |
| 3/12/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75120 Source area SE Corner of shop. |
Robert Weimer |
| 4/13/2012 |
Update or Other Action |
Update from MOA's consultant that they and the MOA they have just gotten site access from the apartment complex for vapor survey/vapor assessment on that property, so they requested an extention until May 11, 2012 to submit the vapor survey/vapor assessment report/plan. That request is approved. |
Robert Weimer |
| 4/20/2012 |
Meeting or Teleconference Held |
Teleconference between DEC, EPA, and the MOA consultant to discuss the proposed Supplemental Work Plan. The work plan calls for collecting soil samples from the treatment cell to check the progress of the remediation, to sample the site monitoring wells, and to install three monitoring wells each at a different groundwater interval near the down gradient northwest corner of the treatment cell. The consultant wil provide an revised work plan based on the DEC/EPA comments. The consultant will also check the condition of monitoring well MW-16 to see if they can collect samples from it or if Chevron needs to decommission that well. |
Robert Weimer |
| 5/4/2012 |
Document, Report, or Work plan Review - other |
ADEC approves revised 4/24/12 work plan for soil and groundwater sampling at the site. The plan includes the installation of 3 monitoring wells to the northwest of the treatment cell. |
Robert Weimer |
| 5/8/2012 |
Document, Report, or Work plan Review - other |
On May 8, 2012 MOA submitted an evaluation of building contruction for conducting a vapor intrusion assessment of the properties located adjacent to the south and east of the property of the former Peacock Dry Cleaners. |
Robert Weimer |
| 5/31/2012 |
Site Visit |
ADEC staff conduct a site visit to observe the collecting soil samples from the treatment cell to check the progress of the remediation. Staff noted that decontamination of the drilling equipment was not being conducted properly and could result in cross contamination of the soil samples. |
Robert Weimer |
| 6/11/2012 |
Update or Other Action |
DEC provided comments on the evaluation of building contruction for conducting a vapor intrusion assessment of the properties located adjacent to the south and east of the property of the former Peacock Dry Cleaners. DEC requested the submittal a soil gas sampling work plan in accordance with DEC's vapor intrusion guidance. DEC recommended that three soil gas probes also be installed within the on property treatments cell and that the building soil gas probes be installed with in 10 feet of the building foundation. |
Robert Weimer |
| 8/7/2012 |
Update or Other Action |
MOA notified DEC that they currently do not have the funds to conduct the vapor instrusion assessment work. They hope to secure the funds in the next month or two. |
Robert Weimer |
| 8/8/2012 |
Update or Other Action |
After consultation with EPA, the DEC approved request to spreading the drill cuttings from B9 on the surface of the treatment cell. The area will then be hydroseeded. |
Robert Weimer |
| 10/29/2012 |
Document, Report, or Work plan Review - other |
On September 2011 1,190 cubic yards of contaminated soil was excavated and placed in an in-situ remediation system within the site AOC. Two horizontal arrays (5.5 feet bgs and 10 feet bgs) of passive vapor extraction pipes were placed in the treatment cell. Regengen-Ox product was mixed with the soil as it was backfilled. |
Robert Weimer |
| 10/30/2012 |
Document, Report, or Work plan Review - other |
On May 31, 2012 18 soil samples were analyzed from the on-site treatment cell to help check the progress of the soil treatment. Up to 58.5 mg/kg PCE, 9.14 mg/kg TCE, 16.9 mg/kg cis 1,2-DCE, 0.0169 mg/kg benzene, 2,370 mg/kg DRO, 913 mg/kg GRO, and 0.148 mg/kg PAHs in the soil samples analyzed. Higher concentrations may exist since some of the highest field screening locations were not analyzed. |
Robert Weimer |
| 10/31/2012 |
Document, Report, or Work plan Review - other |
On June 8-15, 2012 15 monitoring wells were sampled. Up to 1.88 mg/l DRO, 1.45 mg/l PCE, 0.236 mg/l TCE, and 0.376 mg/l cis 1,2-DCE in the samples collected. Higher concentrations may exist since the most contaminated monioring well (B2MW had 40.9 mg/l DRO, 8.33 mg/l PCE, 2.13 mg/l TCE, and 3.54 mg/l cis 1,2-DCE) was removed as part of the September 2011 treatment cell installation. The groundwater concentrations increased in 3 of the 15 sampling locations. Depth to groundwater ranged beteen 4.46 to 14.92 feet below ground surface. Groundwater flow direction was toward the northwest. Three monitoring wells (B9MW, B10MW, and B11MW) were installed and sampled on June 11-13, 2012. The soil samples collected had up to 4.25 mg/kg PCE, 0.0305 mg/kg TCE, 0.0106 mg/kg cis 1,2-DCE, 423 mg/kg DRO, non-detect (<0.011 mg/kg) benzene, and non-detect (<2.42 mg/kg) GRO. The monitoring wells were purged prior to sampling with a bladder pump. Because the sampling interval was not documented in field notes the results are considered biased low. |
Robert Weimer |
| 5/7/2013 |
Update or Other Action |
Update from MOA's consultant that the MOA will be submitting the vapor assessment work plan by early June 2013. |
Robert Weimer |
| 7/19/2013 |
Update or Other Action |
Update from MOA's consultant that the vapor intrusion assessment plan is currently under review by the MOA and once that review has been completed they will submit the work plan to DEC for review and approval. |
Robert Weimer |
| 7/24/2013 |
Site Visit |
Site visit to check on the current condition of the site. Site fencing was not secure, there was a small gap at the gate on the middle north side and a 10 feet section on the middle of the east side had fallen down. Sent message to MOA and their consultant. |
Robert Weimer |
| 7/25/2013 |
Document, Report, or Work plan Review - other |
DEC provided comments to MOA regarding the draft work plan (submitted earlier on 7/25/13) for conducting soil gas sampling from temporary soil gas probes near the apartment building to the south and the homes to the east of the site. DEC requests that the soil gas sampling probes be installed as long term wells because a minimum of two sampling events (frozen and non-frozen ground) are required to assess seasonal soil gas concentrations. If the soil gas probes are only temporary (one sampling event) then they will need to be installed again and sampled to cover frozen ground conditions. MOA said they have limited funds they currently only have site access for temporary soil gas probes for the apartment building property to the the south. |
Robert Weimer |
| 8/5/2013 |
Update or Other Action |
Received notification from MOA that the fence had been repaired. |
Robert Weimer |
| 8/9/2013 |
Document, Report, or Work plan Review - other |
DEC provided comments regarding the proposed soil gas sampling plan.
The soil gas screen should be positioned at 8 feet (i.e above and below this depth) to be representative of this depth; thus the probe will need to be advanced beyond 8 feet likely 8.5 to 9 feet. The same argument holds for the soil gas samples slated to be collected at 4 feet. In their plan, BGES rather suggests anchoring probe in place at 8 or 4 feet. No figure of the finalized soil probe installation is provided which would be beneficial to resolve this concern.
Any vacuum noted on the probe in excess of 10 inches mercury should be documented and ADEC should be notified since the subsurface soils may not be conducive to soil gas sampling (i.e. soils not permeable enough). BGES discusses vacuum on probe but does not provide a remedy if one is noted.
With regard to the TO-17 analysis (sorbent tubes) for PAHs. BGES will need to document the volume and calculations used to determine sample collection time. They also need to confirm that the limits of detection for the analysis meet data quality objectives (i.e. detection limits less than our PAH soil gas target levels).
|
Robert Weimer |
| 9/26/2013 |
Meeting or Teleconference Held |
Discussed the proposed soil gas sampling with MOA's consultant. Because the MOA has not set aside funds they do not initially intend to install any long term soil gas monitoring wells (even the ones to be installed on the east side of the property), or do the PAH soil gas analysis. They are planning to do soil cores nearby to document soil layers, then grout in soil core. We discussed that they need a minimum of 1 non frozen and 1 frozen ground soil gas sample event for VOC and PAH to evaluate the vapor intrusion pathway. It is not acceptable to further delay the initial VOC soil gas sampling for this site.
|
Robert Weimer |
| 10/11/2013 |
Document, Report, or Work plan Review - other |
DEC approves revised soil gas sampling work plan. The revisions include
1. Task 3 – Collection of Soil Gas Samples: The soil gas samples will be collected in 1-liter summa canisters.
2. Task 3 – Collection of Soil Gas Samples: The permanent soil gas sampling implants to be installed on the property adjacent to, and south of 4501 Lake Otis Parkway, will be installed as close to the apartment buildings as possible. If possible, these soil gas implants will be positioned within 10 feet of the apartment buildings, unless the presence of subsurface utilities and/or requirements by the apartment complex manager prevent the placement of these soil gas implants this close to the buildings.
3. Task 4 – Laboratory Analyses: The soil gas samples will not be analyzed for n-butylbenzene, sec-butylbenzene, and tert-butylbenzene, which are not on the laboratory’s standard TO-15 list. The analyses of these compounds by the laboratory require the submittal of a 6-liter summa canister. DEC agrees that they do not need to analyze for these compounds during this round of sampling activities.
|
Robert Weimer |
| 10/29/2013 |
Site Visit |
Site visit to observe soil gas sampling. Because of shallow groundwater due to recent rain events only one soil gas sampling well was installed at 5 feet below ground surface in the northeast corner of the peacock property. |
Robert Weimer |
| 5/5/2014 |
Update or Other Action |
Update from MOA's consultant that the depth to groundwater in monitoring well B7MW was 5.37 feet on March 28,2014 and 4.78 feet on April 25, 2014. The plan to check the water level again on May 22 or 23, 2014. They plan to do soil gas sampling once the water levels drop enough. |
Robert Weimer |
| 5/28/2014 |
Update or Other Action |
Update from MOA's consultant that the depth to groundwater in monitoring wells in May was about the same as in March. Approved to just do shallower probe depth since the deeper depths appear to be underwater most if not all year. |
Robert Weimer |
| 7/7/2014 |
Update or Other Action |
Update from MOA's consultant that they plan to install the rest of the soil gas probes and conduct the sampling starting on July 14, 2014. |
Robert Weimer |
| 11/3/2014 |
Document, Report, or Work plan Review - other |
On October 29, 2013 five soil borings were drilled to help evaluate the best depth to install the proposed soil gas probes. The depth to groundwater ranged between 3.1 to 6.7 feet below ground surface (bgs). Because of the shallow groundwater only one soil gas probe was installed at the northeast corner of the property. The soil gas sample collected on October 29, 2013 at that location was below screening levels and was non-detect for chlorinated solvents. The consultant recommends that the other vapor probes be installed and sampled when the groundwater is seasonally lower. A soil sample collected from the drill cuttings of the five soil borings has 0.0317 mg/kg benzene. |
Robert Weimer |
| 1/7/2015 |
Document, Report, or Work plan Review - other |
ADEC approves the “December 30, 2014 Work Plan Amendment Number 1 for Vapor Intrusion Activities at 4501 Lake Otis Parkway” is approved with the following comments:
1. The outdoor sample should be placed in an area that cannot be tampered with on the windward area of the site (ideally on a roof or other secure location)
2. Recommend that during building survey and during the crawl space air sampling, the pressure differential between crawl space and indoors be measured to get an idea of air flow between the buildings and crawl space.
The work plan proposes to collect air samples from the crawl space of the Quiet Creek Apartments located to the south of the 4501 Lake Otis property.
It should be noted that a non-frozen ground crawl space air sampling event will also need to be conducted in 2015. Additional vapor intrusion assessment/sampling will be required in the future for the Campbell Park Loop Condominiums located to the east of the 4501 Lake Otis property.
|
Robert Weimer |
| 1/7/2015 |
Potentially Responsible Party/State Interest Letter |
PRP letter sent to property owner Municipality of Anchorage - Real Estate Services. |
Robert Weimer |
| 1/8/2015 |
Site Visit |
On January 8, 2015 DEC staff observed the crawl space air sampling for the apartment building located to the south of the Peacock property. |
Todd Blessing |
| 3/26/2015 |
Update or Other Action |
MOA will submit the results of the January 8, 2015 crawl space air sampling soon. Future site work includes groundwater monitoring, investigation of the groundwater contamination with deeper or nested monitoring wells in source area and the inferred down gradient location, release investigation to define the extent of the remaining soil and groundwater contamination, additional vapor intrusion assessment for the nearby residential buildings, and corrective action. |
Robert Weimer |
| 9/24/2015 |
Site Visit |
Site visit to check on site security. Noted that there is a 30 foot section of the fencing at the west side of the site near Lake Otis was down (it looks like a car had run over it) and a 20 foot section on the north side is missing. ADEC notified property owner and requested confirmation when the fencing has been repaired/replaced and the site has been secured. |
Robert Weimer |
| 11/2/2015 |
Document, Report, or Work plan Review - other |
24 hour indoor crawl space and outdoor samples were collected on January 8, 2015 for the apartment building located just to the south of the Peacock Cleaners property. One of the crawl space samples exceeded residential indoor air screening levels for naphthalene (6.4 ug/m3 vs. 0.83 ug/m3 screening level). PCE was non-detect.
|
Robert Weimer |
| 11/2/2015 |
Document, Report, or Work plan Review - other |
Three soil gas samples were collected along the eastern property line near the northeast corner on August 2014 of the Peacock Cleaners property. Naphthalene was detected in some of the soil gas samples (up to 7.9 ug/m3 vs. 8.3 ug/m3 screening level). PCE was non-detect. |
Robert Weimer |
| 6/1/2016 |
Site Visit |
Site visit to check current site conditions. Site appears to be secure. |
Robert Weimer |
| 6/16/2017 |
Update or Other Action |
DEC letter to MOA requesting by August 16, 2017 to submit a work plan, including a schedule for conducting the work for conducting groundwater monitoring of the site monitoring wells and monitoring of the passive remediation system that was installed at the site in 2011. |
Robert Weimer |
| 7/6/2017 |
Site Visit |
Site visit to check current site conditions. Site appears to be secure. |
Robert Weimer |
| 8/9/2017 |
Meeting or Teleconference Held |
Meeting with MOA and their consultant (S&W) to discuss future site work. They will provide a work plan for conducting groundwater monitoring (full VOC 8260, DRO, and GRO) of select monitoring wells, check on condition of the passive remediation system, and crawl space air sampling in frozen and non-frozen conditions at the apartment building. Minimum of annual groundwater monitoring, may need more frequent based on groundwater results. In future may also need additional release investigation including additional nested monitoring wells and confirmation soil sampling for the treatment cell and other soils. |
Robert Weimer |
| 10/3/2017 |
Document, Report, or Work plan Review - other |
DEC approval of October 3, 2017 work plan for groundwater and indoor air sampling. The work plan proposes to sample 9 of the site monitoring wells for DRO, GRO, and VOCs, to check the remediation system, and to conduct a non-frozen ground and frozen ground indoor air sampling event at 7 locations in the nearby apartment building crawl space. |
Robert Weimer |
| 11/28/2017 |
Offsite Soil or Groundwater Disposal Approved |
DEC approves the disposal at the US Ecology Grand View facility of 25 gallons of solvent contaminated purge water generated during the November 2-3, 2017 groundwater sampling event. |
Robert Weimer |
| 12/31/2018 |
Document, Report, or Work plan Review - other |
In April 2018 soil gas sampling was conducted from the passive in-situ treatment system. In October 2017 and February 2018 crawl space indoor air sampling was conducted. On November 2, 2017 groundwater sampling was conducted. |
Robert Weimer |
| 6/4/2019 |
Document, Report, or Work plan Review - other |
On November 2, 2017 15 monitoring wells were sampled. Up to 0.49 mg/l DRO, 680 ug/l PCE, 666 ug/l TCE, 1,130 ug/l cis 1,2-DCE, 6.28 ug/l vinyl chloride, and 28.4 ug/l 1,2,4-trimethylbenzene in the samples collected. Higher concentrations may exist since the most contaminated monitoring well (B2MW had 40.9 mg/l DRO, 8.33 mg/l PCE, 2.13 mg/l TCE, and 3.54 mg/l cis 1,2-DCE) was removed as part of the September 2011 treatment cell installation. The groundwater concentrations increased in 5 of the 15 sampling locations. Depth to groundwater ranged beteen 4.66 to 15.09 feet below ground surface. Groundwater flow direction was toward the north by northwest. Three monitoring wells (B9MW, B10MW, and B11MW) were installed and sampled on June 11-13, 2012. Only monitoring well B7MW had a shallow enough well screen to be sampled at the top of the water column, the rest of the monitoring wells have submerged well screens. |
Robert Weimer |
| 6/4/2019 |
Document, Report, or Work plan Review - other |
On October 2017 eight crawl space air samples and one outdoor air sample were collected during non-frozen soil conditions at the nearby apartment building located to the south of the Peacock Cleaners property. All of the samples were below indoor air screening levels. |
Robert Weimer |
| 6/4/2019 |
Document, Report, or Work plan Review - other |
On February 2018 eight crawl space air samples and one outdoor air sample were collected during frozen soil conditions at the nearby apartment building located to the south of the Peacock Cleaners property. All of the samples were below indoor air screening levels. Based on the results of the November 2017 and February 2018 sample results the consultant concluded that there does not presently appear to be an unacceptable risk to human health at the apartment building associated with the indoor air pathway. |
Robert Weimer |
| 6/4/2019 |
Document, Report, or Work plan Review - other |
On April 2018 seven air samples were collected from the passive vent piping for the in-situ treatment system located on the peacock cleaners property. Up to 250 mg/m3 GRO, 350,000 ug/m3 Tetrachloroethene (PCE), 93,000 ug/m3 Trichloroethene (TCE), 200,000 ug/m3 cis-1,2-Dichloroethene, 1,400 ug/m3 n-Nonane, and 3,600 ug/m3 trans-1,2-Dichloroethene. The other VOCs were non-detect but the detection limits were elevated and may be above screening levels. |
Robert Weimer |
| 9/25/2019 |
Meeting or Teleconference Held |
Meeting with property owner MOA HLB, their consultant, and Chevron's consultant to discuss future site work for closure and future site development. MOA HLB will provide a work plan for the installation and sampling (on a quarterly basis for a minimum of 1 year) of additional monitoring wells to define the extent of the soil and groundwater contamination in the shallow, medium, and deeper groundwater layers for this site. We discussed that routine groundwater monitoring is also needed for the existing site monitoring wells. We discussed there would need to be vapor intrusion sampling for future development, including soil gas sampling after paving, and indoor air sampling if soil gas exceeded screening levels. |
Robert Weimer |
| 2/26/2020 |
Update or Other Action |
Brownfield associated file #2100.57.001 consolidated with CS file #2100.38.511 in fileroom and server drives on this date. |
Cascade Galasso-Irish |
| 6/18/2020 |
Document, Report, or Work plan Review - other |
The Work Plan for Site Characterization Activities was submitted on this date. This work plan proposed advancing three soil boring, installing three groundwater monitoring wells, and collecting soil and groundwater samples. |
Rebekah Reams |
| 7/29/2020 |
Update or Other Action |
A unit conversion error was identified in the June 2018 Site Characterization Report. This error resulted in DRO and GRO being reported at lower concentrations in the sample result summary tables than in the laboratory report. The consultant has been notified of the error and future reporting will include tables with corrected information. |
Rebekah Reams |
| 7/23/2021 |
Document, Report, or Work plan Review - other |
DEC sent comments for the Revised Work Plan for Site Characterization Activities submitted on July 14, 2021. This revised work plan proposes to advance four soil borings, install five groundwater monitoring wells, and collect soil and groundwater samples at the site. |
Rebekah Reams |
| 8/11/2021 |
Site Characterization Workplan Approved |
DEC approved the Revised Work Plan for Site Characterization Activities following comment resolution. This revised work plan proposes to advance four soil boring, install seven groundwater monitoring wells, collect soil and groundwater samples, and collect field screening samples from the in-situ treatment cell located at the site. |
Rebekah Reams |
| 11/3/2021 |
Offsite Soil or Groundwater Disposal Approved |
DEC approved the off-site disposal of (4) 55 gallon drums of soil generated during the 2021 site characterization activates. |
Rebekah Reams |
| 11/23/2021 |
Offsite Soil or Groundwater Disposal Approved |
DEC approved the off-site disposal of (5) 55 gallon drums of purge water generated during the 2021 site characterization activates.
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Rebekah Reams |
| 12/9/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 75120 Source area SE Corner of shop. |
Rebekah Reams |
| 10/20/2022 |
Document, Report, or Work plan Review - other |
DEC provided comments on the Site Characterization Activities Report which documents the advancement of soil borings, installation of monitoring wells, groundwater sampling, and evaluation of the in-situ treatment system at the site. DEC notes that groundwater plume delineation is a high priority at this site and additional downgradient monitoring wells should be installed to further define the extent of groundwater contamination. |
Rebekah Reams |
| 6/22/2023 |
Document, Report, or Work plan Review - other |
ADEC received and reviewed the Revised Site Characterization Report which documents the advancement of soil borings, installation of monitoring wells, groundwater sampling, and evaluation of the in-situ treatment system at the site. DEC notes that groundwater plume delineation is a high priority at this site and additional downgradient monitoring wells should be installed to further define the extent of groundwater contamination.
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Rebekah Reams |
| 9/14/2023 |
Site Visit |
DEC personnel (L. Krebs-Barsis) visited the site with E. Giboney of Heritage Land Bank and D. McMahon of Shannon & Wilson to look at the biocell and identify possible well locations. |
Lisa Krebs-Barsis |
| 10/17/2023 |
Document, Report, or Work plan Review - other |
DEC provided comments on the Work Plan for Site Characterization and Well Decommissioning which proposes to install nested monitoring well B19MW(M)/B19MW(D) along the western property boundary, decommission monitoring wells B5MW(M/D), B6MW, and MW17, and collect analytical samples from remaining site monitoring wells. Following the submittal of this work plan, the Municipality of Anchorage, Shannon & Wilson, and DEC met to discuss the upcoming site characterization efforts and conducted a site visit to better evaluate potential well placement locations. Through these discussions, it was determined that the presence of underground utilities and proximity of Lake Otis Parkway precludes the installation of B19MW and potential alternative well placement locations were identified to the west of Lake Otis Parkway. |
Rebekah Reams |
| 11/30/2023 |
Site Visit |
ADEC staff met with the MOA and Shannon & Wilson at the site to observe site layout and the current and proposed groundwater monitoring locations. |
Rebekah Reams |
| 1/25/2024 |
Document, Report, or Work plan Review - other |
DEC approved the Revised Work Plan for Site Characterization and Well Decommissioning which outlines plans to install nested monitoring wells B19MW(M)/B19MW(D) and B22MW(M)/B22MW(D) to the west of Lake Otis Parkway, decommission monitoring wells B5MW(M/D), B6MW, and MW17, collect soil and groundwater analytical samples, and survey newly installed wells. |
Rebekah Reams |
