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Case Closure Summary ( � <br /> Le(.-))Ig Underground'Fuel Storage Tank PrWrn <br /> Wickland Oil#603, 6425 Pacific Ave., Stockton <br /> III Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Contaminant Soil (PPm) Before After Before After <br /> Before After Before After <05 4.1 (10) 0.170(8) <br /> 4 TPH (Gas) 11,000 87 FREE PRD 7.0 (8) Ethyl-benzene 130 <br /> TPH (Diesel) NA NA NA NA Xylene 770 3 110(10) 1.1 (8) <br /> Benzene 79 <.05 68(10) .002(12) <br /> Toluene 450 <.O5 83(10) .055 (8) MtBE NA <.5 .130(12) .018-SB8 <br /> (8020) 8260 <br /> i 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 /> f 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 11/90 TO 8192. MWA THEN RECORDED TPH-G @ 830,000 PPB <br /> ON 9/22/92. MWA TPH-G CONCENTRATIONS CONSISTENTLY SHOWED A DECLINE TO <50.0 PPB ON 3/11/98 <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 918/98. <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 290,000 <br /> PPB ON 11/27/90 AND TRENDS TO 300 PPB BY 11118198. <br /> MOST CURRENT GW: (LAST GW SAMPING EVENT ON 12112/00). MW-12 (offsite) REPORTS <0.5µgll BENZENE, <50 <br /> µg/I TPH-g, and <0.5µg/I MtBE (by EPA 8260). MW-8 (offsite) HIGHEST RESIDUAL TPH-g,TOLUENE, <br /> ETHYLBENZENE &XYLENE. MW-11 (offsite) HIGHEST RESIDUAL MtBE NOT IN PLUME AREA(0.038 mgll BY EPA <br /> 8260 and possib/yfrom other source,). ALL RESIDUAL GW CONCENTRATIONS REFLECTED IN "AFTER" <br /> RESULTS NOTED IN ABOVE TABLE. NUMBERS IN PARENTHESES IN TABLE INDICATE MW#. <br /> JULY 2001 UPDATE: <br /> 11SB-8" INSTALLED APRIL 26,2001 AND COLLECTED GROUNDWATER SAMPLES FROM SHALLOW("A")ZONE <br /> i AND DEEP ("B")ZONE. ONLY MtBE DETECTED AND ONLY IN "A" ZONE. HIGHEST CONCENTRATION LISTED IN <br /> I "WATER-AFTER" COLUMN OF SECTION III ABOVE. <br /> IV. Closure <br /> Ili 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 /> i <br /> V. Local Agency Representative Data <br /> Name: Donna Heran / Margaret Lagorio Title: Director of Environmental Health/LOP Supervisor <br /> Signature: Date: -I ,p' <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Marty Hartzell Response: <br /> Title:. Engineering Geologist <br /> 1 Case Closure Summary Page 2 of 3 <br />