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Y <br /> •making Underground Fuel Storage Tanks.wbgram <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) 3.3 .22 Ethyl-benzene 1.1 <.0005 <br /> TPH (Diesel) <50. NA Xylene 7.7 <.002 <br /> Benzene .02 .0007 Metals,6010 Zn=140 Zn=0.01 <br /> Toluene 2.1 <.0005 8010, 8080,8260 nondetect <.0005 <br /> MTBE(8260) 1 nondetect I <.005 <br /> Comments NOTE: GROUNDWATER RESULTS IN PARTS PER MILLION! <br /> No remediation performed at site. Soil borings placed to confirm soil impact noted at tank removal. Shallow soil <br /> discoloration noted during borings but cleared to no odor, no staining at 35' bgs. Groundwater grab at worst area of soil <br /> contamination revealed no impact to water from soil above. No soil contamination noted in other than old tank boring (SB-1) <br /> and only groundwater hits in confirmation borings was TPH-G, Zn, and Benzene as note above. Surrounding area is all <br /> commercial and all parcels on city water. Calaveras River about half mile to south in an upgradient position. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? NO CAP <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? NO CAP <br /> Does corrective action protect public health for current land use? N/A <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land use changes? NO <br /> Have the Monitoring/Vapor wells been decommissioned? NW Number Decommissioned: -- Number retained: 0 <br /> List enforcement actions taken: NORR, 26 FEB 1997 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: Donna Heran/Margaret Lagorio Title: Director of Environmental Health/LOP Supervisor <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: APRIL 16, 1998 Response Date: <br /> RB Staff: PAT ANDERSON Response: <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> NONE <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 /> MI/6/97 <br />