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ii <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) j p <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm)After <br /> Before After Before3 After4 Before After Before t <br /> TPH (Gas) 16,000 —10.-0007-- 61.0 0.250 Ethylbenzene 590.02 10.0 4.1 _ 0.0015 <br /> TPH (Diesel) NA NA Xylene 2,8002 1802 16.0 0.0027 t <br /> Benzene 1601 <2.52 10.0 0.0012 <br /> Toluene 1,8001 <2.52 42.0 0.0051 <br /> MTBE INA .200 ppm5 <br /> Comments: 1. Soil sample collected at 26.5 feet during the installation of V3 on 1/24/89. 2. Soil sample collected at 25 <br /> i <br /> feet during the drilling of 5813 on 6/1/95. 3. Water Before-sample-MW4 on 4/13/89. 4. Water After-sample-MW4 on <br /> 10/24/96. 5Methyl-tert-butyl-ether(MTBE)-sample-MW9 on 10/24/96 confirmed by EPA Method 8260. Soil vapor extraction <br /> operated at the site from 11/90 to 11/92. The estimated amount of petroleum hydrocarbons that were removed was 12,000 I <br /> pounds or 1,967 gallons. l <br /> i <br /> i <br /> IV. Closure I <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes. <br /> i <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes. <br /> 'I <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: 14 Number retained: 0 <br /> List enforcement actions taken: NOR(s) sent 10/6/89 & 1/14/91 (Chevron); 1/3/91 & 1/14/91 (R.Blewett); I 1 <br /> 8/25/93 (C.Lawrance for Blewett); 3/8/95 (Manchester Club). I <br /> List enforcement actions rescinded: Compliance problems observed with issued regulatory directives. <br /> V. Local Agency Representative Data <br /> =Name: Heran Title: Director of Environmental Health <br /> Signature: Date: <br /> a-�t.� w- <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> I ' <br /> Date Submitted to RB: 4/24/97 Response Date: 5/29/97 <br /> RB Staff: J. Brathovde Response: No Further Action Required Concurrence <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> Ross Tinline, California Registered Geologist#5860, stated in the Pacific Environmental Group's November 12,„9996 <br /> "Revised Request for Site Closure"that the remaining 4,000 pounds of petroleum hydrocarbons will provide"little potential <br /> for future impact to groundwater"with no discussion of leaching potential. Ross Tinline, stated in the"Revised Request for <br /> Site Closure" dated 2/14/97 that the potential for any human health or environmental risk is negligible and the remaining <br /> petroleum hydrocarbons are not likely to have any adverse impact on water quality. 'I. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. Page 2 of 2 <br /> i i <br />