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Ill Release and Site CharacterizaW Information (continued) i <br /> � Copy <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) ContaminantSoil (ppm) Water (PPM)Before After Before After it Before After Before After <br /> TPH(Gas) X200 1 21 NA .057 MTBE If ND <5.0 xxxxxx xxxxxx <br /> TPH (Diesel) 2080 3800 NA .5 Chromium 31 xxxxxx xxxxxx 1 <br /> Benzene <.600 <.005 NA .0006 Nickel i.i 22 xxxxxx xxxxxx <br /> Toluene .761 .033 NA .001 Zinc ` 69 xxxxxx xxxxxx <br /> Xylene 18.4 .063 NA .002 xxxxxx xxxxxx <br /> Ethylbenzene 2.4 .016 NA <.0005 <br /> t Oil &Grease 18100 NT NA NT {" <br /> a <br /> TPHmo NT 27000 NA <1.0 !j <br /> Comments: Heavy metal results from soil before are from UST#2 . Soil before petroleum and MTBE from UST removal. <br /> All soil and water after results are from the boring investigation. All soil sample results were ND for all contaminants below <br /> 20 feet bsg. Water after sample results collected at 54 feet bsg. Groundwater sample collected at 103 feet bsg was ND for <br /> all contaminants. <br /> IV. Closure '{ <br /> I <br /> I� <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 /> 1 <br /> Does corrective action protect public health for current land use? YES E <br /> li <br /> i Site management requirements: NONE <br /> i� <br /> Should corrective action be reviewed if land use changes?YES <br /> ;r <br /> MonitoringNapor wells decommissioned: 0 Number Decommissioned: 0 Number retained: 0 <br /> ii <br /> I List enforcement actions taken: NOR <br /> 3i <br /> List enforcement actions rescinded: NONE I° + <br /> 'a <br /> ,1 <br /> �F <br /> V. Local Agency Representative Data <br /> !i r <br /> Name: MARGARET LAGORIO, REHS Title: SUPERVISOR, SITE MITIGATION UNIT <br /> �l <br /> Signature: Date: 31 a� <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> I� <br /> Date Submitted to RB: Response Date': <br /> if k <br /> RB Staff: MARTY HARTZELL Response: <br /> Title: ASSOCIATE ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> yah <br /> Minimal groundwater contamination, contaminants ND in groundwater at 103 feet bsg. Soil contaminants ND below 20 feet <br /> bsg. Curent groundwater is at--50 feet bsg. Nearest well is 300 feet distant from investigation area and screened below <br /> detectable contamination from 216 to 226 feet bsg. lk <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 /> r <br />