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F <br /> GeofogicOTechnics Inc. <br /> 27415{iver�oad <br /> �1 Nlndrsto,Ca�foinia 95351 <br /> (209)538-6424/Yax#538-5852 <br /> Work Plan <br /> y - <br /> Additional Site Characterization <br /> Marci's Property <br /> 2969 Loomis Road <br /> Stockton, CA <br /> March 21,2000 <br /> Project No. 770.2 <br /> 1.0 INTRODUCTION <br /> The purpose of this work plan is to complete the San Joaquin County hydrologic monitoring <br /> requirements for ,the Marci's Diesel Service site. These guidelines are outlined in the <br /> correspondence of December 10, 1998, from San Joaquin County Public Health Services <br /> Environmental Safety Division (SJC PHS/EHD). <br /> f 2.0 SOIL BORING AND MONITORING WELL INSTALLATION <br /> The SJC PHS/EHD has requiredthat nested wells be placed at locations MW-5 and MW-6 <br /> (please see Figurc4 2) in order to define the vertical and lateral extent of the contamination <br />' plume in those areas. Construction of nested wells often results in the wells becoming filled <br /> with grout during the installation .of the grout between the two sand packs. .Proper <br /> installation of nested wells requires the use of 10.25-inch o.d. augurs Which are slower to use <br /> and reduce the fuel efficiency of the drill rig. Since nested wells are clearly difficult and <br /> expensive to construct, GTI proposes the following alternative: <br /> Monitoring Wells at MW-5 Location <br /> ➢ <br /> Two soil borings located three feet apart will be installed at the MW-5 location shown in <br /> Figure 2. <br /> ➢ Soil samples will be collected at five-foot intervals. <br /> ➢ The first boring at the MW-5 location shall be drilled to a depth of 15 feet below the last <br /> contamination'noted by field methods. <br /> ➢ If, and only if,;contamination extends'to a depth of 80 feet, the boring will.be completed <br /> as a 95 foot deep, discretely screened monitoring well and named MW-105. <br /> E ➢ The second boring at MW-5 location will be free drilled to a depth of 75 feet and a <br /> monitoring well(MW-5) will be installed.. <br /> r <br /> Monitoring Well at <br /> MW-6 Location - <br /> ➢. At the location of MW-6, a 75-foot monitoring well will be installed. <br /> ,S <br /> 4 <br /> S <br />