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Case Closure Summary Page 2 <br /> (I..4eaking underground Fuel Storage Tank Wram <br /> 111 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) 3400 3400 1.5 ND Xylene 142 142 .160 NO i <br /> TPH (Diesel) NIA NIA NIA NIA Ethylbenzene 660 880 .140 NO <br /> Benzene 179 79 .$90 ND Oil&Grease 21 21 1 NO <br /> Toluene 500 500 0.014 NO Heavy Metals 49 49 NIA <br /> MTBE UNK UNK. UNK <.005 Lead 11.0 11.0 NIA <br /> Comments: (Depth of Remediation, etc.): SOIL EXCAVATION OCCURED TO 20' BGS. SOIL SAMPLE AT 20' BGS ON <br /> EAST EDGE OF PROPERTY(TP-1) CONTAINED HIGHEST RESIDUAL SOIL CONTAMINATION. 4 MWS INSTALLED; <br /> CONCENTRATIONS OF GASOLINE IN GROUNDWATER TO ND. <br /> 1V. 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 /> } <br /> Monitoring/Vapor wells decommissioned: YES Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR SENT <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature. Date: i 3 <br /> VI. Central Valley Regional Water Quality Control Board (.RB) Notification <br /> Date Submitted to RB: 10/10/97 Response Date: 11/04197 <br /> RB Staff: PAT ANDERSON Response: CONCURRENCE <br /> Title: HYDROGEOLOGIST <br /> VII. Additional Comments, Data, etc. . <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 />