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i II'� Case Closure Summary <br /> ?, Luang Underground Fuel Storage Tank Pr%�{im <br /> Wickland Oil#603, 6425 Pacific Ave.,Stockton ff <br /> III Release and Site Characterization Information continued Y <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> i <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 7.0(8) Ethyl-benzene 130 <.05 4.1 (10) 0.170(8) <br /> TPH(Diesel) NA NA NA NA Xylene 770 3 110 (10) 1.1 (8) I <br /> Benzene 79 <.05 68(10) .002(12) <br /> Toluene 450 <.05 83(10) .055 (8) ; <br /> MtBE NA c5 .130(12) .018-SB8 <br /> 8020 (8260) r <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 r <br /> BORINGS IN HOTTEST AREAS CONFIRM "AFTER" SOIL LEVELS NOTED ABOVE. <br /> FREE PRODUCT TO SHEEN NOTED IN MW-1 FROM 11/90 TO 8192. 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 3111198 <br /> FREE PRODUCT IN MW-3 FROM 3/92 TO 11/92. MW-3 THEN RECORDED TPH-G @ 12,000 PPB ON 3/11/93.. 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 1/15/90 <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 11/18/98. ` <br /> MOST CURRENT GW: (LAST GW SAMPING EVENT ON 12112100). MW-12 (offsite) REPORTS <0.5pg/I BENZENE, <50 <br /> pg/I TPH-g, and <0.5pg/1 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: "SB-8" INSTALLED APRIL 26, 2001 AND COLLECTED GROUNDWATER SAMPLES FROM <br /> SHALLOW ("A")ZONE AND DEEP ("B")ZONE. ONLY MtBE DETECTED AND ONLY IN "A"ZONE. HIGHEST <br /> CONCENTRATION LISTED IN "WATER-AFTER" COLUMN OF SECTION III ABOVE. <br /> November 26,2001 update: ALL MONITORING,VAPOR,AND AIR SPARGE WELLS PROPERLY DESTROYED AND <br /> ALL SOIL PROPERLY DISPOSED OF. <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?YES. Number Decommissioned: 13 Number retained: 0 <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 Title: Director of Environmental Health <br /> Signature: I Date: <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: JUNE 6, 2000 Response Date: AUGUST 20, 2001 <br /> RB Staff: Marty Hartzell Response: CONCURRENCE <br /> Title:. Engineering Geologist <br /> Case Closure Summary Page 2 of 3 <br /> I <br />