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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 (ppm) <br /> After Before After After Before After <br /> TPH (Gas) NA NA NA NA Ethyl-benzene <0.005 <0.005 NA NA <br /> TPH (Diesel) 13,000. <50. NA NA Xylene 3.4 <0.005 NA NA <br /> Benzene <0.005 <0.005 NA NA <br /> Toluene <0.005 <0.005 NA NA <br /> MTBE NA <0.05 NA NA <br /> Comments NOTE: GROUNDWATER RESULTS IN PARTS PER MILLIONI.. No remediation performed or required. <br /> TPH-Diesel hit in soil from"Dispenser 1"area at 6' bgs on Nov-1998. Soil borings on Nov-1999 in same area revealed no <br /> TPH-Diesel hits at 10', 15' and 20' bgs. Most shallow DTW=-45'bgs. No hits to threaten groundwater exists. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? None req. <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? NIA <br /> Does corrective action protect public health for current land use? NIA <br /> Site management requirements: none required by PHS-EHD <br /> Should corrective action be reviewed if land use changes?...no <br /> Have the MonitoringlVapor wells been decommissioned? none installed Number Decommissioned: nla <br /> Number retained: 0 <br /> List enforcement actions taken: NOR, April 19, 1999 <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Donna Heran I Margaret Lagorio Title: Director of Env Health I LOP Supervisor <br /> Signature: , Date: <br /> t) h% —� —UO <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: FEB 29, 2000 Response Date: 24 MARCH 2000 <br /> RB Staff: Marty Hartzell Response: CONCURRENCE WITH NFA <br /> Title% Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Simple soil case with no petroleum contaminants detected in past-UST removal LOP investigation...Any potential <br /> soil contamination was in stockpiled soil returned to pit on top of clean imported fill and distance to historical high <br /> depth to groundwater nearly 45 feet. Asphalt capped site minimizes rainfall penetration and leaching to <br /> groundwater. No sensitive receptors within 2000' and no groundwater samples collected. <br /> This document and the related CASE CLOSURE LETTER, shall be retained by the lead agency as part of the official site file. <br /> M II 112000 <br />