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4 <br /> Walter Shockley -2- �` 'June 19, 2008 � -� <br /> Claim No. 9.384 <br /> B.' Monitoring Well Information <br /> Well Designation Date Installed Screen interval Most Recent DTW <br /> feet b s Nov 07 <br /> MW-1 Jun 96 14-34 25.70 <br /> MW-2 Jun 96 12-32 26.40 <br /> MW-3 Jun 96 13-33 26.77 <br /> MW-4 Jun 96 8-28 25.58 % <br /> MW-5 Oct 02 10-30 - <br /> • MTBE THREAT CLASSIFICATION: X <br /> • ' LAND USE DESIGNATION: 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 NA NA NA NA 270,000'. 14,000" 5 <br /> TPH-d NA NA NA NA 1,500,000 520,000 56 <br /> Benzene NA NA 0.64 1.4 10 ND 0.15 <br /> Toluene NA NA 520 520 2.7 ND 40, <br /> Eth (benzene NA NA 400 . 400 13 ND 29 <br /> Xylenes NA NA 270 420 54 ND 17 <br /> MTBE NA NA 32 70 12 ND 5 <br /> TBA NA NA NA NA 27 ND 12 <br /> 1,2-DCA NA NA NA NA ND ND 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 /> i <br /> NA Not Analyzed, Not Applicable,or Data Not Available' <br /> WQO Water Quality Objectives <br /> likely lighter range of TPH-D <br /> V. FREE PRODUCT: free product, TPH-D, in MW-1 and MW-4 <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 sparging <br /> • DURATION: Jun 04 through present <br /> California Environmental Protection Agency <br /> Q. Recycled Paper <br />