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4y <br /> 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 (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 800 170 <.05 <,05 Xylene .480 7.1 .001 <.0005 <br /> TPH (Diesel) 6100 <1 .08 <.05 Ethylbenzene .058 .78 <.0005 <.0005 <br /> Benzene <.005 <.12 .001 <.0005 MTBE NT <.12 .087 <.0005 <br /> Toluene <,005 .21 .001 <.0005 TAME NT NT .005 <.0005 <br /> Comments: Soil TPHg and TPHd before samples were collected at 25' bsg during overexcavation work 12195. All other soil <br /> before samples were collected during tank removal, below the pump area. Soil after results were from soil boring HP1 at 25' <br /> bsg on 2115196. Water before sample results for TPHd were from QM on 8119/99. Water before results for all other <br /> contaminants were from QM on 612199. Water after results are from QM on 8119199, TPHd water after sample from QM on <br /> 12121199. <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 use changes? YES <br /> Monitoring/Vapor wells decommissioned: YES Number Decommissioned: 3 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 List enforcement actions rescinded: NONE 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 Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: <br /> Vi. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 818100 Response Date: 9115100 <br /> RB Staff: MARTY HARTZELL Response: CONCURRENCE <br /> Title: ASSOCIATE ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> Soil and water contaminant concentrations are low. Nearest well is is located 1900 feet SW of the site. Groundwater level <br /> and gradient evidenced historical stability. <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 />