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Monitoring Well Installation Work Plan <br /> WEST CLAY PROPERTIES <br /> 639 West Clay Street, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Ms. Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental, Inc. <br /> (AGE)has prepared this work plan for the installation of two additional,deep screened monitoring <br /> wells at 639 West Clay Street, Stockton, CA (site). A location map is presented on Figure 1. <br /> Monitoring wells, CPT soil boring locations and structures are illustrated in Figure 2. Background <br /> information is summarized in Appendix A. <br /> The scope of work described in this work plan addendum was proposed to further delineate the <br /> vertical and horizontal extent of ground water contamination at the former cluster underground <br /> storage tank (UST) location at the northern-central portion of the site and the former UST No.3 <br /> location further to the south. The San Joaquin County Environmental Health Department (EHD) <br /> directed the assessment of dissolved MTBE east of the former northern UST area and the assessment <br /> of all dissolved petroleum east of the former UST No.3 area. The EHD letters dated 19 May 2009 <br /> and 15 September 2009 are included in Appendix B. The EHD has directed the limits of the <br /> dissolved plumes be defined to manage the risk presented and as a requirement for site closure. <br /> 1 As directed by EHD letter 15 September 2009, an additional ground water remediation feasibility- <br /> engineering cost comparison analysis (SCCA) <br /> p, 4 , including monitored natural attenuation (MNA), <br /> (�U1top <br /> in-situ oxidation(air-sparging and ozone infection)and groundwater extraction should be evaluated P r�l <br /> with analysis of cost per remediation, once the limits of the dissolved plume areas are determined. <br /> 2.0. SCOPE OF WORK <br /> This work plan has been prepared in accordance with Central Valley Regional Water Quality Control <br /> Board guidelines for the investigation of underground storage tank (UST)sites. The scope of work <br /> includes the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil boring advancement and soil sample collection and analysis; <br /> • Deep monitoring well installation, development and sampling and analysis; <br /> • Report preparation. <br /> Advanced GeoEnvironmental,Inc. <br />