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j sa`s' ri 'tom li <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 ii (ppm)After <br /> Before After Before3 After4 Before After Before � <br /> TPH (Gas) 16,000 10,—OO—OZ- 61.0 0.250 Ethylbenzene 590.0 -1-0.-02- 4.1 0.0015 <br /> TPH (Diesel) NA NA Xylene 2,8002 1802 16.0 0.0027 <br /> Benzene 1601 <2.52 10.0 0.0012 <br /> Toluene 1,8001 <2.52 42.0 0.0051 <br /> MTBE NA ; .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 /> feet during the drilling of 5613 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 <br /> pounds or 1,967 gallons. <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 /> 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 /> I. l <br /> MonitoringNapor 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); <br /> 8/25/93 (C.Lawrance for Blewett); 3/8/95 (Manchester Club). <br /> List enforcement actions rescinded: Compliance problems observed with issued regulatory directives. <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health i <br /> Signature: - Date: <br /> ! <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <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 /> i <br /> VII. Additional Comments, Data, etc. j <br /> Ross Tinline, California Registered Geologist#5860, stated in the Pacific Environmental Group's November 12, 1996 <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 2114/97 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. <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 <br />