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Leaking Underground Fuel Storage Tank Program _ <br /> I!1 Release and Site Characterization Information continued ;`•�� ) <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil (ppm) Water {ppm) Contaminant Soil (ppm) Water {ppm} <br /> Before After Before After Before After Before After <br /> TPH(Gas) 11,000 87 FREE PRD 5 4(8) Ethyl-benzene 130 < 05 4 1 C1—0) !0 170(8) <br /> TPH (Diesel) NA NA NA NA Xylene 770 3 110(10) 1 1 (8) <br /> Benzene 79 < 05 68(10) 007 (12) <br /> Toluene 450 <05 83 (10) 055 (8) <br /> MtBE NA < 5 i30 (12) Oi6 {i2} <br /> 8020) (8260 <br /> Comments NOTE- GROUNDWATER RESULTS IN PARTS PER MILLION! <br /> SOIL VAPOR EXTRACTION AND AIR SPARGE REMEDIATION CONDUCTED AT SITE SVE CAT-OX, THEN TO <br /> CARBON, AND FINALLY TO DIRECT DISCHARGE TO ATMOSPHERE UNDER SJVAPCD PERMIT CONFIRMATION <br /> BORINGS IN HOTTEST AREAS CONFIRM "AFTER" SOIL LEVELS NOTED ABOVE <br /> FREE PRODUCT TO SHEEN NOTED IN MWA FROM 11190 TO 8192 MWA THEN RECORDED TPH-G @ 830,000 PPB <br /> ON 9122192 MWA TPN-G CONCENTRATIONS CONSISTENTLY SHOWED A DECLINE TO<50 0 PPS ON 3111/98 <br /> FREE PRODUCT IN MW-3 FROM 3192 TO 11192 MW-3 THEN RECORDED TPH-G @ 12,000 PPB ON 3111193 MW-3 <br /> TPH-G SHOWED DECLINE TO <50 0 PPB BY 9!8!98 <br /> MW-10 RECORDS HIGHEST GROUNDWATER BTEX CONCENTRATIONS WITH INITIAL SAMPLING ON 1115190 <br /> (BTEX RESULTS IN "BEFORE' NOTED ABOVE) MW-10 LATER SPIKES SUDDENLY WITH TPH-G; IN GW AT <br /> 290,000 PPB ON 11/27/90 AND TRENDS TO 300 PPB BY 11/18/98 <br /> MOST CURRENT GW (LAST GW SAMPING EVENT ON 1108199) MW-12 (offsite) STILL RECORDS HIGHEST <br /> RESIDUAL BENZENE AND MtBE (by EPA 8260) IN PLUME MW-8 (offsite) HIGHEST RESIDUAL TPH-G, TOLUENE, <br /> ETHYLBENZENE & XYLENE MW-11 (offsite) HIGHEST RESIDUAL MtBE NOT IN PLUME AREA (0 044 mgll BY EPA <br /> 8020 and possibly from other source,) ALL RESIDUAL GW CONCENTRATIONS REFLECTED IN "AFTER" <br /> RESULTS NOTED IN ABOVE TABLE NUMBERS IN PARENTHESES INDICATE MW# <br /> IV Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? YES <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements NONE REQUIRED <br /> Should corrective action be reviewed if land use changes? YES CURRENT LAND USE IS COMMERCIAL <br /> Have the Monitoring/Vapor wells been decommissioned? NOT YET Number Decommissioned /Number retained 13 <br /> List enforcement actions taken NOR 10-21-88 <br /> List enforcement actions rescinded NONE <br /> V Local Agency Representative Data <br /> Name Donna Heran /Margaret Lagorio Title Director of Environmental Health / LOP Supervisor <br /> Signature Date <br /> VI Central Valley RegionaFWater Qualit Control Board RB Notification <br /> Date Submitted to RB Response Date <br /> RB Staff Marty Hartzell Response <br /> Title Engineering Geologist <br /> VII Additional Comments, Data, etc <br /> Single-wailed, 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 /> PHS-EHD approved-March 2000 soil over-excavation at dispenser areas and Engineered backfill all done after latest <br /> Request for Closure submitted on Feb 16, 2000 Separate report details the dispenser over-excavations and the <br /> successful removal of impacted soils Canopy taken down in May 2000 and site undergoing plan approval by PHS- <br /> EHD for restart of gas station with existing USTs, new islands/dispensers, and canopy, and new tenant <br /> M I–512000 <br />