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San Joaquin County Page 4 Phase II Assessment Work Plan <br /> Public Health Services Tracy, California <br /> Environmental Health Division 7 August 2000 <br /> Groundwater Sampling and Anal <br /> Groundwater will be sampled in the four direct push borings, after advancing the borings to their <br /> maximum total depth. The groundwater samples will be collected by placing a temporary well <br /> screen and casing into the boring after withdrawing the soil probe, and using a narrow diameter <br /> bailer to retrieve a grab sample. The samples will be obtained using new disposable polyethylene <br /> bailers and new string for each location. The water will be carefully decanted into preserved <br /> containers appropriate to the analyses. The sample bottles will be labeled as to well identification <br /> and the date and time of sampling, and will be immediately placed into a chilled cooler on ice. <br /> The samples will be delivered to a California-certified analytical laboratory accompanied by <br /> proper chain-of-custody documentation. <br /> The groundwater samples will be analyzed for the following: <br /> • Petroleum Hydrocarbons in the diesel and motor oil carbon chain ranges by USEPA Method <br /> 8015 modified (Cal-DHS). <br /> • Volatile Organic Compounds (VOCs) by USEPA Method 8260B. <br /> Surficial Soil Sampling and Analysis <br /> For evaluation of potential impacts to surface soils from pesticides and herbicides, WESTON will <br /> composite soil samples from three areas of the site. Within each of the three composite sample <br /> areas, eight discrete soil samples will be collected from the upper approximately one foot, using a <br /> trowel and shovel. The eight discrete samples will be combined in a stainless steel bowl or <br /> similar container, and transferred to the sample container. The approximate areas from which <br /> composite soil samples will be collected are shown in Figure 3. The sample holes will be <br /> backfilled with excavated soil. <br /> The composite surface soil samples will be analyzed for the following: <br /> • Persistent organochlorine pesticides by USEPA Method 8081 <br /> • Chlorinated herbicides by USEPA Method 8151 <br /> All sampling equipment, including trowels, shovels, hand auger, and sampling tubes used will be <br /> decontaminated by washing in a potable water and low phosphate detergent solution, then rinsed <br /> with potable water and deionized water. The proposed direct push borings will be abandoned by <br /> SCA: s:\whc\wp\sharedl\projects\homedepo\tracy\p2wkplan.doc <br />