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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water 7 (ppm) <br /> After Before After After Before After <br /> TPH(Gas) 2,390 <1.0 <0.05 <0.05 Xylenes 239 <0.005 <0.0005 <0.0005 <br /> TPH (Diesel) 573 2.9 0.173 <0.05 Ethylbenzene 41.2 <0.005 <0.0005 <0.0005 <br /> Benzene <1.25 <0.005 <0.0005 <0.0003 Oil&Grease NA NA NA NA <br /> Toluene 25.6 <0.005 <0.0005 <0.0003 Heavy Metals NA NA NA NA <br /> MTBE NA <0.005 NA <0.0005 <br /> Comments: NO REMEDIATION WAS PERFORMED AT THIS SITE. 'BEFORE' SOIL CONCENTRATIONS ARE FROM <br /> SOIL BORING EGC-3 at 16 FEET ON 10/19/99. `AFTER'SOIL CONCENTRATIONS ARE FROM MW1 AT 30 FEET ON <br /> 6/25/00. 'BEFORE'WATER CONCENTRATIONS ARE FROM ECG-2 ON 10/19/99. `AFTER'WATER <br /> CONCENTRATIONS ARE FROM MW-1 ON 7/30/00. ALL CONCENTRATIONS PASS THE SAN FRANCISCO BAY <br /> ENVIRONMENTAL SCREENING LEVELS. <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 <br /> Should corrective action be reviewed if land uses changes?YES <br /> Monitoring/Vapor wells decommissioned: YES Number Decommissioned: 1 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN, REHS Title: ENVIRONMENTAL HEALTH DIRECTOR <br /> Signature: 77 , Date: __O <br /> L_�vyvy`c.._ <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 01/09/2009 Response Date: 01/28/2009 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRANCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> The <br /> site domestic well has been sampled quarterly since 2002 as part of the site investigation of ARCO #595 located at <br /> 6100 N. H . 99; analytical results have always been reported as non-detect for all constituents. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official <br /> site file. <br />