Laserfiche WebLink
t <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Pr ram <br /> Wickland Oil#603, 6425 Pacific Ave., Stockton <br /> 11 � <br /> III Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> 7Benzene79 <br /> Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> 11,000 87 FREE PRL) 7.0(8) Ethyl-benzene 130 <.05 4.1 (10) 0.170 (8) <br /> NA NA NA NA Xylene 770 3 110 (10) 1.1 (8) <br /> <.05 68 (10) .002 (12) <br /> 450 <.OS 83(10) .055 (8) I <br /> MtBE NA <.5 .130 (12 .018-SB8 <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 /> I FREE PRODUCT TO SHEEN NOTED IN MW-1 FROM 11190 TO 8/92. MWA THEN RECORDED TPH-G @ 830,000 PPB <br /> ON 9122/92. MW-1 TPH-G CONCENTRATIONS CONSISTENTLY SHOWED A DECLINE TO <50.0 PPB ON 3/11198 <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 1/15190 <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 11/18198. <br /> MOST CURRENT GW: (LAST GW SAMPING EVENT ON 12/12/00). MW-12 (offsite) REPORTS <0.5pgll BENZENE, <50 <br /> µg11 TPH-g, and <0.5pg/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 mg/I 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 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 /> I Have the Monitoring/Vapor wells been decommissioned? NOT YET. Number Decommissioned: Number retained: 13 <br /> List enforcement actions taken: NOR 10-21-88 <br /> Signature: <br /> i <br /> List enforcement actions rescinded: NONE J <br /> V. Local Agency Representative Data <br /> Name: Donna Heran / Margaret Lagorio Title: Director of Environmental Health/LOP Supervisor <br /> Date: <br /> rTitle:. <br /> tral Valle Regional Water QualityControl Board RB Notification <br /> 1 ubmitted to RB: Response Date: <br /> ff: Marty Hartzell Response: <br /> En ineerin Geolo ist <br /> Case Closure Summary Page 2 of 3 <br />