| Action Date |
Action |
Description |
DEC Staff |
| 5/2/1986 |
Release Investigation |
SI; Source of contamination determined to be Peters Creek Tesoro as identified in Peters Creek Spill Investigation, December 12, 1986 by Woodward-Clyde Consultants |
Rich Sundet |
| 5/23/1986 |
Release Investigation |
SI; Peters Creek Private Well Contamination Study, May 23, 1986, by DOWL Engineers: indicated boundaries of contaminant plume but could not identify the source of spill (Ref. in Woodward-Clyde Report Draft 2/27/90) |
Former Staff |
| 7/1/1986 |
Release Investigation |
SI; Logs of borings, June 23 to June 24, 1986, Peters Creek, Alaska. Report to the Anchorage Water and Wastewater Utility by Harding Lawson Associates, July, 1986. (Ref. in Woodward-Clyde report draft of 2/27/90) |
Former Staff |
| 8/14/1986 |
Update or Other Action |
AWS; Permanent water system installed for affected residents. |
Former Staff |
| 12/23/1986 |
Update or Other Action |
F; 250 Gallons of unleaded gasoline were recovered between December 1986 and May 15, 1987 as reported in Peters Creek oil spill cleanup, June 1987 by Crowley Environmental Services. |
Former Staff |
| 1/7/1988 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 78002 ADD; |
Former Staff |
| 1/7/1988 |
Site Added to Database |
|
Former Staff |
| 1/8/1988 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; :LCAU Date changed DB conversion |
Former Staff |
| 9/14/1988 |
Update or Other Action |
RAU; Remedial contract for VES awarded to Woodward-Clyde Consultants |
Former Staff |
| 9/14/1988 |
Update or Other Action |
F; Draft Report, Peters Creek Groundwater Remediation Program, February 27, 1990, by Woodward-Clyde Consultants. |
Former Staff |
| 12/1/1988 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; RFP for additional remedial work prepared by Brad Hahn, ADEC. |
Former Staff |
| 5/17/1989 |
Update or Other Action |
RAU; VES remediation system was started. |
Former Staff |
| 1/16/1990 |
Update or Other Action |
RAU; VES remediation system was shutdown, est. 24,500 pounds of hydrocarbons were recovered. |
Former Staff |
| 5/21/1990 |
Update or Other Action |
RAU; Contract awarded to Harding Lawson & Associates to run VES remediation for additional 6 months nd to conduct water sampling. |
Former Staff |
| 11/6/1990 |
Update or Other Action |
RAU; 2 VES systems shut down. VES #1 was demobilized. Estimated recovery was 2,400 pounds of hydrocarbons. |
Former Staff |
| 1/7/1991 |
Long Term Monitoring Established |
MS; Analysis report for work order #29972 shows 8020 ppm total petroleum hydrocarbons, 36.2 ppm benzene, 183 ppm toulene, 166 ppm p & m xylene all in sample 1. |
Former Staff |
| 1/18/1991 |
Update or Other Action |
F; HLA report of vapor extraction operation received. VES-1 & VES-2 were operated from 6/11/90-11/6/90 extracting a total of 2600 lbs. of hydrocarbons. Monitoring wells 2 thru 4 show marked decreases in hydrocarbons since 1-87. MW 1 showed increases of hydrocarbon levels. It's recommended that VES-1 operate 1 more season & VES-2 shutdown. |
Former Staff |
| 7/22/1991 |
Update or Other Action |
RAU; ADEC staff began operating VES #2. System was monitored weekly. |
Former Staff |
| 8/29/1991 |
Update or Other Action |
RAU; Ecology & Environment was contracted to sample wells M1 through M7. A horizontal survey was also conducted. BTEX concentrations up to 36,200 ug/L were recorded. Concentrations were lover than previous years samples. |
Former Staff |
| 11/30/1991 |
Update or Other Action |
RAU; VES #2 shut down for the winter. Estimated recovery from the system was 1388 pounds of hydrocarbons. |
Former Staff |
| 5/12/1992 |
Update or Other Action |
RAU; Abandoned eight VES wells and three monitoring wells. Installed two new VES wells and connected them to the existing VES. VES restarted for the season. |
Former Staff |
| 5/13/1992 |
Update or Other Action |
RAU; Ecology & Environment, Inc. contracted to sample 6 monitoring wells, and to measure groundwater elevations. BTEX concentrations continue to drop. Highest values are 25,000 ppb, down fro 36,200 ppb in 8/29/91. |
Former Staff |
| 1/26/1995 |
Risk Assessment |
RISK; Reviewed draft limited Human Health Risk Assessment Report and requested only minor changes. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: ROBERT E. SANDEN |
Former Staff |
| 3/21/2001 |
Update or Other Action |
No work performed since completion of the RA. Muni took the site for failure to pay back taxes. |
Lynne Bush |
| 3/21/2001 |
Update or Other Action |
Nothing done on-site since RA. The MOA took the property for back taxes. |
Lynne Bush |
| 12/21/2001 |
Update or Other Action |
Site transferred Bush to Sundet |
Lynne Bush |
| 1/30/2003 |
Update or Other Action |
Telephone call from neighboring property owner asking for information on current situation. |
Lynne Bush |
| 10/10/2003 |
Update or Other Action |
On 10/23/03, DEC issued NTP 1870001617A to Ecology & Environment to perform a site characterization and groundwater investigation for $91,069.00. The work was requested in an RFP dated 9/2/03. The NTP was issued in response to E&E's 9/16/03 proposal. |
Rich Sundet |
| 4/6/2004 |
Update or Other Action |
DEC issued a PRP letter to John and Ernest Emmi, and Martinus List because DEC understood that they were the recent new owners of the former Sanden Tesoro site located at Lots 9 & 10, Block 2, Earl Ray Subdivision. The letter informed them of the States requirement to perform cost recovery and that additional investigation and cleanup may be necessary if they developed the property. The letter suggested that one method to address their responsibility was to enter into a voluntary agreement with DEC. |
Rich Sundet |
| 4/16/2004 |
Update or Other Action |
On 4/16/04, Sundet discussed w/John Emmi whether he was willing to grant access to allow DEC and its contractor to sample his drinking water well at the former Sanden site. He verbally agreed and would review the faxed access form. Later DEC faxed John a cover letter that described the sampling work proposed to sample his DW well and included an access form that he needed to sign and return to DEC which would allow DEC/contractors access to sample his well. |
Rich Sundet |
| 4/20/2004 |
Update or Other Action |
DEC received the signed access agreement from John Emmi to sample his drinking water well on site. |
Rich Sundet |
| 7/8/2004 |
Update or Other Action |
On 7/8/04, DEC issued NTP 1870001620 to E&E for $15,841.00 to complete the draft and final report that was for 1870001617A which expired on 6/30/04. Field work was completed between February and June 30, 2004.
NTP 1870001617A was issued to Ecology & Environment to perform a site characterization and groundwater investigation for $91,069.00. The work was requested in an RFP dated 9/2/03. The NTP was issued in response to E&E's 9/16/03 proposal. |
Rich Sundet |
| 10/20/2004 |
Update or Other Action |
On 10/20/04, NTP 1870001624 was issued for $3,888.00 to E&E to complete Task 3, the groundwater investigation report. |
Rich Sundet |
| 12/22/2004 |
Document, Report, or Work plan Review - other |
On 12/22/04, CSP provided comments to E&E via e-mail in a marked up copy of their draft report "2003-2004 Project Summary Report Peters Creek Groundwater Investigation Peters Creek, Alaska" dated 11/5/04. The draft report was received by DEC on 12/13/04 via e-mail. |
Rich Sundet |
| 6/16/2005 |
Update or Other Action |
DEC received the final report "2003/2004 Project Summary Report Peters Creek Groundwater Investigation Peters Creek, Alaska" dated 6/2005 from its contractor E&E. In 2003 and 2004, 16 existing monitoring wells and active drinking water wells, or former drinking water wells that are acting as monitoring wells were sampled. Findings showed that the BTEX contamination levels had decreased significantly (75.88-99.94% from the same wells sampled in 1993/94 and 2003/04). Only 2 of the 16 wells sampled (monitoring wells M-1 and M-2) exceeded cleanup levels for benzene; 1,3,5-trimethylbenzene; 1,2,4 trimetylbenzene; toluene or ethylbenzene in Table C of 18 AAC 75. The highest concentration of benzene detected during the 2003/04 investigation was at M-2 at 4,860 ug/L and during the 1993/94 investigation benzene was at 6,100 ug/L in that well. Other BTEX constituents also decreased significantly such as toluene at M-1 from 27,000 ug/L in 1993/94 to 221 ug/L in 2003/04. It is unclear whether dilution, natural attenuation, or migration of the contaminants resulted in the plume's decrease, however, the benzene contaminant plume decreased by about 50% between 1993/94 and 2003/04. It is possible that the contaminants may have migrated to deeper aquifer than the known 4 aquifers in the area to depths greater than 200 ft below ground surface.
The report found that no drinking water well system sampled had any VOC, including BTEX, above 18 AAC 75 Table C cleanup levels or 18 AAC 80 MCLs. and most BTEX constituents were non detect. All residences with drinking water wells within the area of contamination exceeding cleanup levels had been disconnected and now on the MOA public drinking water system. Drinking water wells that are in the deeper aquifers and in the downgradient edge of the plume were non detect for BTEX or DRO. |
Rich Sundet |
| 12/21/2005 |
Update or Other Action |
File number issued 2112.26.001 (FKA CS 200.04). |
Aggie Blandford |
| 6/16/2006 |
Update or Other Action |
ADEC sent a letter to the downgradient landowner of Tract C-2 discussing a draft Notice of Environmental Contamination (NEC). A NEC has not yet been filed for the property. |
Meghan Dooley |
| 5/1/2008 |
Exposure Tracking Model Ranking |
Intitial Ranking Complete for Source Area: 78002 (Autogenerated Action) |
|
| 7/25/2013 |
Document, Report, or Work plan Review - other |
The 2013 Groundwater Monitoring Report was received. One well, M-9 was installed near the source area. Five wells, including the newly installed well and two drinking water wells, were sampled and analyzed for GRO, DRO, RRO, BTEX, and PAH. GRO, Benzene, and Ethylbenzene were observed at concentrations exceeding Table C at wel M-2. GRO, DRO, Benzene, Toluene, and total xylenes were observed at concentrations exceeding Table C at the VES well, SB-4. No exceedances were noted at the new well, M-9, however groundwater was encountered at a much more shallow depth than at the nearby SB-4. No exceedances were noted in the two drinking water wells. |
Meghan Dooley |
| 11/23/2015 |
Update or Other Action |
Contacted owner of Voyles Tract C-1 to request access for future sampling to determine the extent to the north of the plume. Access was denied. DOL is preparing a prospective purchaser's agreement (PPA) with the owner of Voyles Tract C-2. |
Lisa Krebs-Barsis |
| 11/6/2017 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78002 Gasoline UST. |
Bill O'Connell |
| 10/4/2019 |
Document, Report, or Work plan Review - other |
Reviewed and approved work plan for Sandens. Activities to be conducted include an updated potable well search, inspection/repair/sampling of MW1, MW2, MW9, and SB-4/VES-1. Samples will be analyzed for GRO and VOCs. Scope of work also includes installation of up to three additional wells if needed. A separate brief work plan will be submitted detailing that activity if needed. |
Bill O'Connell |
| 3/27/2020 |
Document, Report, or Work plan Review - other |
Reviewed work plan for groundwater monitoring well decommissioning, monitoring well installation, and sampling. Three onsite wells: VES-1, M-9 and a third unnamed well have been unusable in recent sampling event and will be decommissioned in accordance with DEC guidance. Two new monitoring wells will be installed on the subject property, developed and sampled. |
Bill O'Connell |
| 4/29/2021 |
Document, Report, or Work plan Review - other |
Reviewed 2019 and 2020 Site Assessment Activities Report. Activities conducted during this time frame included a revised well search; decommissioning of a former potable well that had historically been used for groundwater monitoring; installing and sampling two new monitoring wells on the source property; sampling existing wells; and decommissioning 3 monitoring wells. The well search found numerous drinking water wells within a ¼ mile radius but did not identify any downgradient wells at risk from site contamination. Groundwater samples were collected from off-property monitoring wells M-1, M-2, and M-8 in December 2019 and from the new on-property wells MW-11 and MW-12 in April, 2020. Three on-property wells; VES-1/SB4, M-9, and a third unnamed well were decommissioned in April 2020. Groundwater sampling results indicate petroleum contamination in groundwater exceeds DEC cleanup levels at off-property wells M-2 (GRO, BTEX), M-1 (ethylbenzene), and on-property wells M-11 and M-12 (GRO, BTEX). The report concludes groundwater contaminant concentrations continue to decline off-property and there is no potential current exposure via the drinking water pathway. |
Bill O'Connell |
