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ARCO -2- ` April 21, 2008 <br /> Claim No. 15783 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Jan 08 <br /> MW-1 Sep 00 ?-24 12.98 <br /> MW-2 Sep 00 ?-22 13.30 <br /> MW-3 Sep 00 ?-24 12.36 <br /> MW-4 Jul 02 ?-29 12.56 <br /> MW-5 Jul 02 ?-25 12.88 <br /> MW-6 Aug06 ?-60 14.07 <br /> • MTBE THREAT CLASSIFICATION: C <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) Jan 08 <br /> TPH-g NA NA NA NA 25,000 2,700 5 <br /> TPH-d NA NA NA NA NA NA 49 <br /> Benzene NA NA 0.64 1.4 1,820 53 0.15 <br /> Toluene NA NA 520 520 503 1.5 42 <br /> Eth (benzene NA NA 400 400 1,500 87 29 <br /> Xylenes NA NA 270 420 1,600 52 17 <br /> MTBE NA NA 32 70 40,000 330 5 <br /> TBA NA NA NA NA 35,000 540 12 <br /> 1,2-DCA NA NA NA NA ND 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 /> B. In-Situ Soil Remediation: none identified <br /> C. Groundwater Remediation: <br /> • METHOD: ozone injection proposed in Oct 04, not yet conducted <br /> CalgorRia Err viroamental Protection Agency. <br /> �a Recyc%d Pepe, <br />