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Gene Gabbard Inc. -2- May 2, 2008 <br /> Claim No. 13324 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Jun 06 <br /> MWA Dec 00 7-32 22.07 <br /> MW-2 Dec 00 7-32 21.78 <br /> MW-3 Dec 00 7-32 21.35 <br /> MW-4 Dec 00 7-32 21.49 <br /> MW-5 May 03 18-38 22.35 <br /> MW-6 May 03 17-37 2200. <br /> MW-7 May 03 17-37 21.90 <br /> • MTBE THREAT CLASSIFICATION: X <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 (u/L WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> m /k (mg/kg) Jun 06 <br /> TPH-g NA NA NA NA FP 420 5 <br /> TPH-d NA NA NA NA FP NA 49 <br /> Benzene NA NA 0.64 1.4 FP 5 0.15 <br /> Toluene NA NA 520 520 FP 4.1 42 <br /> Eth (benzene NA NA 400 400 FP 4.2 1 29 <br /> Xylenes NA NA 270 420 FP 17 17 <br /> MTBE NA NA 32 70 FP <2 5 <br /> TBA NA NA NA NA FP <20 12 <br /> 1,2-DCA NA NA NA NA 100 <2 0.5 <br /> Lead NA NA 400 800 FP NA 15 <br /> PCE NA NA 17 130 160 87 0.06 <br /> TCE NA NA 0.11 110 6.5 2.6 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 /> WQO Water Quality Objectives <br /> FP Free phase petroleum product <br /> V. FREE PRODUCT: up to 0.71 feet of free phase petroleum product has been <br /> identified in MW-3. Free product recovery was conducted from Jul 01 through Apr 03 <br /> removing approximately 90 gallons of an oil/water mixture. <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil/ Groundwater Remediation: only free product removal <br /> California Enviroomeota/Protectron Agency <br /> • Qct Recy l dPaper <br />