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Page 2 <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill, Release and site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations--Before and Affier Cleanup <br /> Contaminant Soil Before {ppm} Wafer {ppm} Contaminant Soil Before (ppm) Water {ppm} <br /> After Before After After Before After <br /> Xylenes 480 200 2.0 0.0058 <br /> TPH (Gas) 5,000 2,200 30.0 1.1 47 1.2 {0.0005 <br /> TPH(Diesel) 510 1,300 1.9 =.05 Ethylbenzene 100 0.67(lead) NA <br /> Benzene 46 6.4 7:7 0.48 Heavy MetaCs112.0 <br /> 20 O Pb 5 0.26 0.02 <br /> 260 57 1.9 =0.0005 MTBE <br /> TolueneMTBE FM BUKNU <br /> Comments: SGML`BEFORE' DATA AR FROM PIPING LICIL BORING B5@6 FEE F, E CEPTTPHDNE SAMPLE DURING TANK REMOVAL.SOINL AFTER' DATA ARE l <br /> B2@8 FEET,AND Pb RESULT FROM <br /> AT 8' BSG. SOIL AFTER CHECK EXE-20 FOR <br /> FROM EXCAVATION FLOOR SAM.LE PETROLCOLLECTEEUM HYDROCARB NS WERE REMOVED DURING TPHg; <br /> BENZENE EXE-17 FOR XYLENES, MAJORITY OFROM WELL MW-1 <br /> EXCAVATION ACTIVITIES.WATER'BEFO E' D TA CHECKLE GRAB SAM LE. WATE PIT DURING TANK RDATA ARE EMOVAL B <br /> EXCEPT Pb RESULT IS FROM.A GRAB WATER <br /> ACTIV4TlES. <br /> 1V. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Pian?YES <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Flan? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring/Remediation wells decommissioned: YES Number Decommissioned 19 Number retained: 0 <br /> List enforcement actions taken: Notice of Responsibility: 5124194, 7/20199 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data Title: DIRECTOR <br /> Name: DONNA RERAN, REHS <br /> Signature: <br /> Date: 8/27112 <br /> VI, Central Valley Regional Water Qualitf Control Board RB Notification <br /> Date Submitted to RB: 2/13/12 Response Date: 3/29/12 <br /> RB Staff: JAMES L.L. BARTON, PG Responso: <br /> Title: ENGINEERING GEOLOGIST <br /> VII.Additional Comments, Data, etc. <br /> rtecl b the lead agency.as part of the afFicial site file. <br /> "this clocumerit and the ro4ated CASE CL4�URE LETTER�haH�u reta� y <br />