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Geohogica(Technics Inc. <br /> 2741 R,iverRoad <br /> Modesfa,Carfarnm 95351 <br /> (209)538-64241faX,#538 5852 <br /> Work Plan <br /> 1 <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 Mare'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 /> 2.0 SOIL BORING AND MONITORING WELL INSTALLATION <br /> ' The SJC PHS/EHD has required that nested wells be placed at locations MW-5 and MW-6 <br /> (please see Figure 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 /> ➢ 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 /> ' ➢ Fhe 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 /> ➢ <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 /> ➢ 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 /> Monitoring Well at MW-6 Location <br /> ➢ At the location of MW-6, a 75-foot monitoring well will be installed <br />