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FEASIBILITY PILOT TESTS WORK PLAN <br /> WEST CLAY PROPERTIES <br /> 639 West Clay Street - <br /> Stockton;California <br /> 1.0. INTRODUCTION F <br /> a Atithe request of Ms Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental, Inc <br /> (AGE) has prepared this Work Plan for the installation of additional wells and performance of an <br /> in-situ air sparging (IAS) pilot test and ground water extraction pilot tests at the subject property <br /> Background information is summarized in the Quarterly Monitoring Report and Data Summary- <br /> December 1997 and the Quarterly,Report- October 1999, both prepared byAGE <br /> Iii a'16 November 1999 meeting, documented by letter from the PHS-EHD dated 24 November <br /> 1999, the PHS-EHD concurred with the necessity of the installation of additional monitoring-wells <br /> at the former UST cluster location to define the lateral extent of impacted soil and ground water and <br /> that feasibility studies should be performed at the former UST No 3 location to examine options for <br /> remediation The installation of additional wells are necessary for performance of feasibility testing <br /> 2.0. SCOPE OF WORK <br /> This scope of work is being performed in accordance with San Joaquin County Public Health Service <br /> - Environmental Health Division(PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board guidelines for the investigation of underground storage tank (UST) sites <br /> Three ground water monitoring wells and one ground water extraction well will be installed near the <br /> former UST cluster location One in-situ air sparging well and one ground water extraction well will <br /> be installed near the former UST No 3 location An in-situ air sparging (IAS) pilot test and two <br /> ground water extraction pilot tests will be performed at the site A Site Health & Safety Plan is <br /> currently on file with the PHS-EHD for the referenced site <br /> 2 1 WELL INSTALLATION ' <br /> y <br /> S <br /> _ _=Three borings will Ibe advanced north, west and east of MW-10 to.total depths of 45 feet,below <br /> surface grade (bsg), using a drill rig equipped with 10-inch diameter hollow-stem augers The <br /> borings will be dual-completed as ground water monitoring'wells with two-inch diameter screened <br /> casings'installed from approximately 40 to 45 feet bsg and from 30 to 10 feet bsg Soil samples will <br /> be collected at 5-foot intervals,'beginning at a depth of 15 feet bsg <br /> 1 <br /> One boring will be advanced south of MW-10 to a total depth of 30 feet bsg and will be completed <br /> as a four-inch diameter ground water extraction well with screened casing installed from <br /> • approximately 30 to 10 feet bsg Soil samples will be collected at 5-foot intervals, beginning at a <br /> depth of 10 feet bsg <br /> Advanced GeoEnvironmental,Inc <br /> 4 <br /> 1 ti <br /> Y 1 <br /> f <br /> f i <br />