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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <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 /> Contaminant Sal (ppm) Water (ppm) Contaminant Soil ::7F <br /> Water (ppm) <br /> Before After Before After BeforeBefore After <br /> TPN (Gas) 11,000 87 FREE PRD 7 0 (8) Ethyl-benzene 130 41 (10) 0170 (8) <br /> TPH (Diesel) NA NA NA NA Xylene 770 110 (10) 1 1 (8) <br /> Benzene 79 < 05 68 (10) 002 (12) <br /> Toluene 450 < 05 83 (1G) 055 (8) <br /> MtBE NA < 5 130(12) 018-SBB <br /> so2o 826o <br /> Comments NOTE; GROUNDWATER RESULTS IN PARTS PER MILLIONI <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 MW-1 FROM 11190 TO 8/92 MW-1 THEN RECORDED TPH-G @ 830,000 PPB <br /> ON 9/22/92 MW-1 TPH-G CONCENTRATIONS CONSISTENTLY SHOWED A DECLINE TO <50 0 PPB 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 918198 <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 /> PPS ON 11127/90 AND TRENDS TO 300 PPB BY 11/18/98 <br /> MOST CURRENT GW (LAST GW SAMPING EVENT ON 12112100) MW-12 (offsjte) REPORTS <0 511g11 BENZENE, <50 <br /> µg/l TPH-g, and <0 5µg11 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 possibly from 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 /> "SB-8" INSTALLED APRIL 26, 2001 AND COLLECTED GROUNDWATER SAMPLES FROM SHALLOW ("A")ZONE <br /> AND DEEP ("B") ZONE ONLY MtBE DETECTED AND ONLY IN "A" ZONE HIGHEST CONCENTRATION LISTED IN <br /> "WATER-AFTER" COLUMN OF SECTION III ABOVE <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 potentiaf beneficial uses per the Regional Board Basin Pian? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements NONE REQUIRED <br /> i <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 Agencv Re resentative Data <br /> ,=/ Margaret Lagono Title Director of Environmental Health / LOP Date <br /> VI Central Valley Regional Water Quality Control Board RB Notification i <br /> Date Submitted to RB Response Date <br /> RB Staff Marty HartzeEl Response <br /> Title En ineer�n Geolo ist <br /> Case Closure Summary Page 2 of 3 <br />