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- a <br /> Geologicaf Technics Inc. <br /> 2601-&ever Road <br /> Modrsto,Ca&fomia 95351 <br /> (2 09)538.6424/'jax#538-5852 <br /> I <br /> Work Plan <br /> Monitoring Well Installation & Groundwater Monitoring <br /> Ripon Milling, Inc. <br /> 320 Stockton Street <br /> Ripon, California <br /> Project No. 253.2 <br /> February 3, 1995 <br /> 1.0 PROPOSED INVESTIGATION <br /> 1.1 Monitoring Well Installation 3 <br /> To further investigate the extent of diesel range petroleum hydrocarbons in the soil <br /> and groundwater environments, Geological Technics Inc. proposes to install one <br /> groundwater monitoring well (MW-1) in the suspected down gradient direction. <br /> from the point of release. San Joaquin County Public Health Services Environmental �I <br /> Health Division (SJCPHSEHD) personnel reportedly conducted a review of the <br /> Ripon Nestle facility groundwater monitoring data and has determined that the <br /> groundwater exhibits a predominately north direction of flow. Therefore <br /> monitoring well MW-1 will be installed within a few feet of the north side where the <br /> deepest and highest concentration of diesel was located (Figure 2 Site Map). The <br /> well boring will be drilled using a 10.25 inch outside diameter continuous flight <br /> C hollow stem auger owned and operated by V&W Drilling (C57# 658786). Soil <br /> cuttings will be added to the existing stockpile on site within the fenced yard and <br /> underlain and covered with plastic. <br /> MW-1 will be constructed using 4.0 inch diameter PVC casing with flush threads. <br /> The screened interval will extend from five feet above the water table to fifteen feet <br /> below the water table. Groundwater is expected to be located at about 35 feet below <br /> grade. I€ a significant clay unit is encountered during the drilling of the well, the <br /> well may be seated no greater than 3 ft into that fine grained unit. A 43 sand filter <br /> pack will surround and extend two feet above the 0.020" screened interval. A <br /> granular bentonite transition seal will be installed and hydrated. A surface seal will <br />