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V Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> r III Release and Site Characterization Information (continued) <br /> I <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil Before Soil Water Water Contaminant Soil Soil =fore <br /> Water <br /> (ppm) After Before After Before AfterAfter <br /> TPH(Diesel) 1600 ND ND ND MTBE N/A NIA • N/A ND I <br /> Benzene ND ND ND ND EDB N/A NIA NIA ND <br /> Toluene ND ND ND ND 1,2-DCA NIA NIA NIA ND <br /> Ethylbenzene ND ND ND ND ' <br /> Xylenes 0.49 ND ND ND <br /> 1,600 ppm of diesel and 0.49 ppm of Xylenes were found in soil samples from 12.6 feet bsg east end of the 2,000-gallon <br /> diesel tank located next to the then-still-in-service 18,400-gallon gas tank in October 1988. The 2,000-gallon tank was <br /> initially installed in August 1988 but removed in October 1988 due to failed precision test. The tank area was then re- <br /> excavated to 16 feet in December 1988, and soil sample from 16.3 feet bsg results were all non detect(ND). The 2000- <br /> gallon tank was subsequently re-installed in 1989 and currently in use to date. Results of all other soil and groundwater <br /> samples before and after the over-excavation in the area of all three tanks(two removed, one still in service)were all ND at <br /> appropriate detection levels. <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 wells decommissioned: None Number Decommissioned: 0 Number retained: 2 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> =Name Lagono Title: Supervising REHS/Site Mitigation/LOP Unit IV <br /> t <br /> Signature:`�� <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff:Jim Barton Response: <br /> Title:Assoc Eng Geologist <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 <br /> official site file. (08124/93) Exhibit N Page 2 of 2 <br /> j <br />