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WORK PLAN ADDENDUM SOIL GAS <br /> AND GROUND WATER INVESTIGATION <br /> January 1997 <br /> Weldon Church, Inc. <br /> 104 West Beverly Place <br /> Tracy, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with the request of Mr. Weldon Church,Advanced GeoEnvironmental, Inc. (AGE) <br /> has prepared the enclosed Work Plan for Soil and Ground Water Investigation at 104 West Beverly <br /> Place in Tracy, California (the site). The location of the site is illustrated on Figure l -Location <br /> Map. A plan of the site is illustrated on Figure 2 -Site Plan. The work plan includes the installation <br /> of two ground water monitoring wells and at least six soil vapor probe borings. Background <br /> information and a description of previous investigations at the site were presented in the Preliminary <br /> Investigation and Evaluation Report-August 1996, dated 10 September 1996, prepared by AGE. <br /> The work is performed in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board guidelines for investigation of underground storage tank (UST) sites. <br /> 2.0. SCOPE OF WORK <br /> 2.1. DRILLING AND SAMPLING <br /> The PHS-EHD is requiring the installation of two additional ground water monitoring wells to <br /> determine the lateral extent of hydrocarbon-impacted ground water both on site and off site. <br /> Therefore, AGE proposes to drill and install two ground water monitoring wells: one monitoring <br /> well will be located on the property located at 101 West Beverly Place (APN # 233-15-26) and a <br /> second well will be located on the northwest corner of the site. Each well should be designed with <br /> two-inch casings screened from 3 to 15 feet in depth. Monitoring well design is illustrated in Figure <br /> 3 - Monitoring Well Design. <br /> Each well boring will be advanced utilizing a truck-mounted, hollow stem drill rig equipped with <br /> 8.25-inch hollow-stem augers. Soil samples will be collected beginning at a depth of 5 feet bsg. <br /> Samples will be collected using a California split-spoon sampler and brass sleeves or a c nt9 inuousâś“ <br /> core sampler. The samples will be driven by dropping a 140-pound weight from a height of 30 <br /> inches. The number of blows required to drive each 6-inch length of the sampler (blow counts) are <br /> to be recorded on the boring logs by an AGE staff geologist. <br /> Upon sample retrieval, the middle brass sleeve will be removed from the sampler. The ends of the <br /> sleeve will be immediately covered with Teflon sheets, sealed with plastic end caps, secured with <br />