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BP P-oducts -2- April 21, 2008 <br /> Clain No. 2413 <br /> • MINIMUM GROUNDWATER DEPTH: 10 feet <br /> • MAXIMUM GROUNDWATER DEPTH: 21 feet <br /> • FLOW DIRECTION:north <br /> • SOIL TYPES: interbedded and intermixed sand, silt, and clay <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Nov 07 <br /> MW-1 May 90 ?-30 15.09 <br /> MW-3 May 90 ?-30 15.83 <br /> MW-4 May 90 ?-30 16.72 <br /> MW-5 Aug91 ?-40 15.76 <br /> MW-6 Aug91 ?-40 15.72 <br /> MW-7 Jun 91 ?-40 15.84 <br /> MW-8 Aug01 ?-28 14.81 <br /> MW-9 Aug01 ?-29 14.52 <br /> MW-10 Aug01 ?-28 14.28 <br /> MW-11 Aug01 ?-79 17.93 <br /> MW-12 Jun 03 ?-30 16.52 <br /> MW-13 Jun 03 ?-30 14.62 <br /> • MTBE THREAT CLASSIFICATION: B <br /> • LAND USE DESIGNATION: residential and commercial <br /> • ESTIMATED WATER QUALITY OBJECTIVES (WQO'S) FOR SITE: Per the <br /> Water Quality Control Plan (Basin Plan) for the Sacramento River Basin and the <br /> San Joaquin River Basin (Fourth Edition). <br /> IV. MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS <br /> Contaminant Soil m /k PRGs Water (ug/L WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> (mg/kg) (mg/kg) Nov 07 <br /> TPH-g NA NA NA NA 160,000 89,000 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 472 120 0.15 <br /> ToluE!ne NA NA 520 520 6.3 14 42 <br /> Eth benzene NA NA 400 400 20 340 29 <br /> X ler es NA NA 270 420 50 140 17 <br /> —MTB:-: NA NA 32 70 198,000 30 5 <br /> TBA NA NA NA NA 240,000 25,000 12 <br /> 1,2-DCA NA NA NA NA 15 1.2 0.5 <br /> Lead NA NA 400 800 NA NA 15 <br /> PCE NA NA 17 130 NA NA 0.06 <br /> TCE NA NA 0.11 110 NA NA 0.8 <br /> PRGs USEPA Region 9 Preliminary Remediation Goals <br /> MCL Maximum Contaminant Levels <br /> AL Action Level <br /> NA Not Analyzed, Not Applicable,or Data Not Available <br /> California En vironmental Protection Agency <br /> 0 Recycled Paper <br />