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San Joaquin County Page 4 Phase II Assessment Work Plan <br /> Public Health Services Tracy, California <br /> Environmental Health Division 30 April 1999 <br /> • Total recoverable petroleum hydrocarbons by EPA Method 418.1 (one sample per direct <br /> push boring for a total of three total soil samples assumed). <br /> • Persistent organochlorine pesticides and chlorinated herbicides, by EPA Methods 8081 and <br /> 8150/8151 (three total composite soil samples assumed). <br /> Groundwater Sampling and Analysis <br /> Groundwater will be sampled in the three direct push borings, after advancing the borings to their <br /> total depth (less than 15 feet bgs if sufficient water to sample is encountered shallower). The <br /> groundwater samples will be collected by placing a temporary well screen and casing into the <br /> boring after withdrawing the soil probe, and using a narrow diameter bailer to retrieve a grab <br /> sample. The samples will be obtained using new disposable polyethylene bailers and new string <br /> for each location. The water will be carefully decanted into preserved containers appropriate to <br /> the analyses. The sample bottles will be labeled as to well identification and the date and time of <br /> sampling, and will be immediately placed into a chilled cooler on ice. The samples will be <br /> shipped or delivered to a California-certified analytical laboratory accompanied by proper chain- <br /> of-custody documentation. <br /> The groundwater samples will be analyzed for the following parameters: <br /> • Total recoverable petroleum hydrocarbons by EPA Method 418.1 (three total samples <br /> assumed). <br /> • Persistent organochlorine pesticides and chlorinated herbicides, by EPA Methods 8081 and <br /> 8150/8151 (three total composite soil samples assumed). <br /> 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 /> filling to ground surface with a bentonite/neat cement grout, placed through a tremie pipe. The <br /> direct push boring method to be used is anticipated to generate negligible amounts of waste, and <br /> the possible contaminants of concern are not anticipated to render the material a regulated <br /> hazardous waste. Therefore, the soil sample remnants and sampling equipment rinsate will be <br /> discharged to the ground at the boring locations. <br /> SCA: s:\whc\wp\sharedl\projects\homedepo\tracy\p2wkplan.doc <br />