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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Wickland Oil #603, 6425 Pacific Ave., Stockton <br /> VII. Additional Comments, Data, etc. <br /> Single-walled, first set of USTs removed in 1988. Upgraded dual-walled fiberglass UST's installed since and remain <br /> in place now. Site undergoing reconstruction for new tenant to begin gas station operation with existing USTs. <br /> (July 2001 update: New fiberglass USTs now installed due to existing USTs failure to hold pressure). PHS-EHD <br /> approved-March 2000 soil over-excavation at dispenser areas and Engineered backfill all done after latest Request <br /> for Closure submitted on Feb 16, 2000. Separate report details the dispenser over-excavations and the successful <br /> removal of impacted soils,with NO petroleum impacted soil remaining in place. Canopy taken down in May 2000 <br /> and site undergoing plan approval by PHS-EHD for restart of gas station with existing USTs, new <br /> islands/dispensers, and canopy, and new tenant. <br /> July 17, 2001 Update. <br /> In response to the CVRWQCB's "NON-CURRENCE TO NFA" LETTER dated 17 July 2000,further investigation to <br /> the east was required. A work plan dated February 2, 2001 was submitted by "WEGE" on March 13, 2001. PHS- <br /> EHD approved the proposal for additional borings on March 19, 2001. The additional borings "SB-8,9, &10", CPT <br /> #1 &CPT#2 were installed under permit on April 26, 2001. "WEGEs" report of findings for this phase dated May <br /> 30,2001 was submitted to PHS-EHD and the CVRWQCB on June 8, 2001. The conclusions contained in the report <br /> were evaluated and approved by Marty Hartzell and discussed with PHS-EHD at the June 20, 2001 LOP/CVRWQCB <br /> meeting. CVRWQCB asked for a re-submittal of the "REQUEST FOR CLOSURE CONCURRENCE" papers. <br /> Groundwater data from this phase were from "SB-8" only. Although groundwater samples were collected from <br /> "SB-9" and "SB-10",they were held in case "SB-9" got significant hits and further delineation was required. Based <br /> on feedback from the CVRWQCB, groundwater samples from "SB-9 & 10"were not analyzed. <br /> "A"Zone: <br /> The samples from "SB-8" confirmed that TPH-g and Benzene were not detected from discrete depths of 48' to 52' <br /> bgs("A" zone top) and 84' to 88' bgs ("A" zone bottom). MtBE was detected in the "A" top zone groundwater <br /> samples at 18 µg/I and in the "A"zone bottom at 1.2µg11. <br /> "B"Zone: <br /> Groundwater samples from "SB-8" collected from 94' to 98' bgs ("B" zone top) and 116' to 120' bgs ("B" zone <br /> bottom). TPH-g, Benzene, and MtBE were non-detect. <br /> DIPE,TAME, ETBE, and TBA analyzed by EPA Method 8260 and non-detect in groundwater samples from "SB-8". <br /> WEGE concluded that the groundwater petroleum plume was vertically defined and the laterally defined in the "B" <br /> zone. The lateral "A"zone MtBE detected in "SB-8" was "close to this (California Public Health-13Ng/1)goal and <br /> will continue to degrade with time." On behalf of Wickland Oil Company, WEGE concluded "no further action is <br /> necessary and all wells associated with this site should be destroyed". <br /> ...end of summary..... <br /> Case Closure Summary Page 3 of 3 <br />