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SIERRA-PACIFIC GROUP <br /> Geologists+Engineers+Scientists+Compliance Specialists <br /> April 6,2001 <br /> Mr. John Wotila <br /> San Joaquin County Public Works Department <br /> 1810 East Hazelton <br /> Stockton, California 95205 <br /> Subject: Encroachment Assurance Bonds,Proposed Monitoring Wells Located in East Stockton <br /> Near the FormerPureGro Facility at 1905North BroadwayAvenue,Stockton,California: <br /> Sierra-Pacific Project No. 94-055.02 <br /> Dear Mr. Wotila: <br /> On behalf of Unocal, Sierra-Pacific Group (Sierra-Pacific)has proposed to install three nested monitoring <br /> wells in the streets of east Stockton,south of Waterloo Road. Encroachment permit applications have been <br /> sent to you. The permits applications,data table,and the attached location map each identified the proposed <br /> well locations correctly. However,typographical errors were made on Sierra-Pacific's cover letter, which <br /> subsequently resulted in location errors on two of the three financial assurance documents. <br /> Michael Infurna,San Joaquin County Public Health Services,recently requested street-address locations for <br /> each of the proposed new monitoring wells. Sierra-Pacific traveled to east Stockton on 4 April 2001 and <br /> marked the street locations with white paint. Overhead power lines, underground utility easements, and <br /> traffic issues influenced the locations of the proposed new wells. The amended locations are: <br /> MW-15A/B Location <br /> In the southbound lane of North Sutro Avenue, 225 feet south of the centerline of Waterloo Road. <br /> Near 1845 North Sutro Avenue, Stockton, CA. <br /> MW-16A/B Location <br /> In the southbound lane of Myran Avenue, 225 feet south of the centerline of Lewis Street. <br /> Near 1633 North Myran Avenue, Stockton, CA. <br /> MW-17A/B Location <br /> In the southbound lane of North Sutro Avenue, 225 feet south of the centerline of John Street. <br /> Near 1527 North Sutro Avenue, Stockton, CA. <br /> 4911 Windplay Drive,Suite 4 E-Mail:mail@www.sierra-pacificgroup.com Phone:(916)933-1468 <br /> El Dorado Hills,CA 95762 Fax:(916)933-3197 <br />