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Central CA Traction Co. -2- <br /> March 24, 2008 <br /> Claim No. 16496 <br /> B. Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Most Recent DTW <br /> feet b s Feb 02 <br /> MW-1 Sep 00 35-50 48.75 <br /> MW-2 Sep 00 1 35-50 Dry <br /> MW-3 Sep 00 35-50 Dry <br /> MW-4 Nov 01 ? Dry <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 (ug/L WQOs <br /> Maximum Latest Residential Industrial Maximum Latest (ug/L) <br /> 1999 (mg/kg) m k Dec 05 <br /> TPH NA NA NA NA 2,000 NS 5 <br /> TPH-d 22,000 12,000 NA NA 94,000 4,460 49 <br /> Benzene 12 28 0.64 1.4 28 NS 0.15 <br /> Toluene 11 NA 520 520 22 NS 42 <br /> Eth (benzene 61 NA 400 400 550 NS 29 <br /> Xylenes <1.2 NA 270 420 2,400 NS 17 <br /> MTBE <1.2 NA 32 70 35 NS 5 <br /> TBA NA NA NA NA <5 NS 12 <br /> 1,2-DCA NA NA NA NA <1 NS 0.5 <br /> Lead NA NA 400 800* NA NS 15 <br /> PCE NA NA 1 17 130 NA NA 0.06 <br /> TCE NA NA 1 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 /> NS Not sampled <br /> V. FREE PRODUCT: none identified <br /> VI. SOIL AND GROUNDWATER REMEDIATION <br /> A. Soil Excavation: 10,400 tons of contaminated soil was excavated in 2005 <br /> B. In-Situ Soil/ Groundwater Remediation: none identified <br /> VII. SENSITIVE RECEPTOR SURVEY: five wells identified within '/2 mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: tractor facility <br /> B. Site History: the extent of groundwater contamination is not defined <br /> California Environmental Protection Agency <br /> Q'3 Recycled Paper <br />