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i <br /> ` Case Closure Summary Page 2 of 2 <br /> r <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> k <br /> I <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) <1.0 NA NA Xylene <0.005 <.0005 +x.0005 i <br /> TPH (Diesel) 63. * 0.390 + <0.05 MTBE <0.05 <.0005 +<.0005 i <br /> Benzene <0.005 * <0.0005 +<.0005 <br /> Toluene <0.005 * <0.0005 +00005 <br /> Ethyl-benzene <0.005 * <0.0005 +<.0005 <br /> Comments NOTE: GROUNDWATER RESULTS IN PARTS PER MILLION! <br /> *: no remediation performed (no `after' samples). <br /> +: last monitoring well sample (270ctober2003) <br /> Only two (2) ground water sampling events held since the three (3) monitoring wells were installed,July 18,2003, <br /> No TP Wd ever in monitoring well ground water samples. Only TPHd ground water'hit' (0.390 PPM) from push-point i <br /> soil borin , "PB-GW-3", 10' south of tank pit, 19 September 2002, and now location of MW-3, still <0.05 ppm. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? No remed action. <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? nla (none done) <br /> Does corrective action protect public health for current land use? No remed done <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes? Not required <br /> Have the Monitoring/Vapor wells been decommissioned? Not yet Number Decommissioned: 0 Number retained: 3 <br /> List enforcement actions taken: NOR, 11June2002 i <br /> List enforcement actions rescinded: nla ' <br /> l' <br /> i <br /> V. Local Agency Representative Data <br /> Name: Dona Heran Title: Director of Environ Health <br /> I <br /> Signature: Date: <br /> VI. Central Vallpy Regional Water Quality Control Board RB Notification <br /> 1 <br /> Date Submitted to RB: 26Feb2004 Response Date: 04March2004 <br /> RB Staff: Gordon Lee Boggs Response: concurrence <br /> Title: UST Program Mana er <br /> VII. Additional Comments, Data, etc. <br /> No remediation directed or performed at site. Monitoring wells placed at requirement of J. Barton (CVRWm for <br /> Two ground water sampling events revealed low level soil TPHd has NOT impacted ground water>10'from former <br /> UST pit. No sensitive receptors within 2000 feet. ` <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 112104 <br />