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r <br /> Work Plan— 1,2-DCA Investigation <br /> Former American Forest Products Site,Stockton,California April 2,2002 <br /> URS Corporation Americas Page 2 <br /> f <br /> i� <br /> — At a depth of 40 feet below ground surface(bgs); and <br /> — At a depth of 55 feet bgs; <br /> • Analyze the water samples for volatile organic compounds(VOCs)including 1,2-DCA using EPA <br /> Method 82608; and <br /> • Prepare an Addendum Report to the Closure Request Report. <br /> _ m <br /> 2.0 SAMPLING METHODS AND PROCEDURES <br /> Presented in this section are the tasks associated with collection of groundwater samples. <br /> S � . <br /> 21 HEALTH AND SAFETY PLAN <br /> Work at the site will be conducted using the existing site-specific Health and Safety Plan (HSP) that was <br /> developed for previous drilling activities. <br /> 2.2 PERMITS PROCUREMENT AND UTILITIES CLEARANCE j <br /> If required,San Joaquin County well installation permits will be obtained for the proposed sampling locations. <br /> However,because the sampling locations are not permanent wells, permits do not appear to be required. Site <br /> access will be coordinated with current site operator. The sampling locations will be marked, and <br /> 4 Underground Service Alert(USA) will be contacted to obtain clearance of underground utilities prior to the <br /> advancement of the borings. In addition, historic site maps will be utilized to locate and mark underground <br /> utilities in the investigation area. <br /> 2.3 SAMPLING LOCATIONS <br /> 4 <br /> The objective of the proposed investigation is to delineate 1,2-DCA concentrations in groundwater <br /> downgradient of existing monitoring wells. The groundwater flow has varied approximately 180 degrees <br /> during the previous 14 years, based on data presented in Figure 3. The groundwater gradient is currently <br /> oriented toward the north-northeast, which has been the prevalent flow direction since 1998. The existing <br /> monitoring well network provides adequate coveragein in the directions west and south..of the wells where <br /> 1,2-DCA has been detected(DMW-2,DMW-5 and DMW-6). Therefore, sampling locations proposed for <br /> 4 this investigation will be located in the areas north and east of these three wells, as indicated in Figure 3. <br /> K:%40191AFP1DCA_WORKPLAN.DOC <br /> u , <br />