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9 0 <br /> Rose and Rogers Estate -2- April 23, 2008 <br /> Claim No. 11508 • <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Feb 08 <br /> MW-1 r Sep 96 22-52 18.30 <br /> MW-2r Apr 03 15-30 - <br /> MW-3r Apr 03 15-30 17.98 <br /> MW-4rs Apr 03 35-50 19.42 <br /> MW-4rd Apr 03 75-80 19.90 <br /> VW-1d Feb 04 28-40 19.04 <br /> VW-2d May 01 10-23 19.06 <br /> VW-3d May 01 12-22 18.96 <br /> VW-4d Feb 02 20-40 18.38 <br /> • MTBE THREAT CLASSIFICATION: N <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) Feb 08 <br /> TPH-g NA NA NA NA 280,000 97,000 5 <br /> TPH-d NA NA �NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 15,000 5,900 0.15 <br /> Toluene NA NA 520 520 6,000 1,000 42 <br /> Eth (benzene NA NA 400 400 2,400 1,900 29 <br /> Xylenes NA NA 270 420 7,100 5,530 17 <br /> MTBE NA NA 32 70 550 <50 5 <br /> TBA NA NA NA NA <10,000 NA 12 <br /> 1,2-DCA NA NA NA NA NA NA 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 /> WQO Water Quality Objectives <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: unknown volume <br /> California Environmenta/Protection Agency <br /> CO*Recycled Paper <br />