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f Case Closure Summary Leaking Underground Fuel Storage Tank Program Wickland Oil #603, 6425 Pacific Ave , Stockton VII Additional Comments, Data, etc Single-walled, first set of USTS removed in 1988 Upgraded dual-walled fiberglass UST's installed since and remain in place now Site undergoing reconstruction for new tenant to begin gas station operation with existing USTs (July 2001 update New fiberglass USTS now installed due to existing USTS failure to hold pressure) PHS-EHD approved-March 2000 soil over-excavation at dispenser areas and Engineered backfill all done after latest Request for Closure submitted on Feb 16, 2000 Separate report details the dispenser over-excavations and the successful removal of impacted soils, with NO petroleum impacted soil remaining to place Canopy taken down in May 2000 and site undergoing plan approval by PHS-EHD for restart of gas station with existing USTS, new islands/dispensers, and canopy, and new tenant Jul 17 2001 Update In response to the CVRWQCB's "NON-CURRENCE TO NFA" LETTER dated 17 July 2000, further investigation to the east was required A work plan dated February 2, 2001 was submitted by "WEGE" on March 13,2001 PHS- EHD approved the proposal for additional borings on March 19, 2001 The additional borings "SB-8, 9, & 10", CPT #1 & CPT#2 were installed under permit on April 26, 2001 "WEGEs" report of findings for this phase dated May 30, 20C 0, 2001 was submitted to PHS-EHD and the CVRWQCB on June 8, 2001 The conclusions contained in the report were evaluated and approved by Marty Hartzell and discussed with PHS-EHD at the June 20, 2001 LOP/CVRWQCB meeting CVRWQCB asked for a re-submittal of the "REQUEST FOR CLOSURE CONCURRENCE" papers "Groundwater data from this phase were from "SB-8" only Although groundwater samples were collected from SB-9 and "SB-10", they were held in case SB-9 got significant hits and further delineation was required Based on feedback from the CVRWQCB, groundwater samples from "SB-9 & 10" were not analyzed "A"Zone The samples from "SB-8" confirmed that TPH-g and Benzene were not detected from discrete depths of 48' to 52' bgs ("A"zone top) and 84' to 88' bgs ("A"zone bottom) MtBE was detected in the "A" top zone groundwater samples at 18 µg11 and in the "A" zone bottom at 1 2µg11 "B"Zone Groundwater samples from "SB-8" collected from 94' to 98' bgs ("B"zone top) and 116' to 120' bgs ("B"zone bottom) TPH-g, Benzene, and MtBE were non-detect DIPE, TAME, ETBE, and TBA analyzed by EPA Method 8260 and non-detect in groundwater samples from "SB-8" WEGE concluded that the groundwater petroleum plume was vertically defined and the laterally defined in the "B" zone The lateral "A"zone MtBE detected in "SB-8"was "close to this (California Public Health-13,ug/1) goal and will continue to degrade with time " On behalf of Wickland Oil Company,WEGE concluded "no further action is necessary and all wells associated with this site should be destroyed" end of summary _j I Case Closure Summary Page 3 of 3