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Mr. Ray Barges • • <br /> 21 July 1991 <br /> Page Two <br /> hollow stem auger without using any drilling fluids . To minimize <br /> the potential for cross contamination, clean sampling equipment <br /> will be used at each sampling interval and all down-hole <br /> equipment (augers, samplers, rods) will be steam-cleaned prior to <br /> use. The soil cuttingsd by the drilling operations will <br /> be placed and sealed in(karre1_0 and disposed of according to all <br /> applicable local, state, and federal regulations , pending the <br /> receipt of analytical tests . <br /> Each of the monitors well will be constructed using a two-inch <br /> diameter polyvinylchloride (PVC) schedule 40 casing with blank <br /> and screened sections . Joints will be all flush coupled and <br /> threaded. Ten-foot screened sections (factory slotted, 0 .01 inch <br /> perforations) will be placed opposite the permeable material <br /> encountered. Filter sand will be tremied into place around the <br /> PVC pipe to a level about two feet above the top of the <br /> perforations , Bentonite pellets will then be placed to fill the <br /> annular space to a level at least two feet above the filter pack. <br /> Cement grount will then be placed as a sanitary surface seal . <br /> Finally, locking steel well vaults will be built around the well <br /> casings . <br /> Prior to sampling, monitor wells will be developed by swabbing <br /> and removal of a minimum of ten well volumes of water. Wells <br /> will then be sampled by lowering a clean bailer into the well <br /> casing. The sample will be decanted into laboratory prepared <br /> sample bottles and placed on ice until delivery to the certified <br /> analytical laboratory. A chain-of-custody form will be <br /> maintained for the samples and accompany the cooler to the <br /> laboratory. One duplicate sample, and one trip blank (for <br /> volatile compounds only) will serve as quality control samples <br /> for the testing program. <br /> ANALYTICAL 'TESTING <br /> The water samples will be analyzed for the following constituents <br /> using the indicated analytical methods : <br /> Total extractable hydrocarbons - EPA Method 8015 modified <br /> Total volatile hydrocarbons - EPA Method 8015 modified <br /> Total Oil and Grease - SMWW 5520B <br /> Chlorinated herbicides - EPA Method 8150 <br /> Carbamate and Urea pesticides - EPA Method 8320 <br /> Organophosphate pesticides - EPA Method 8140 <br /> Organochlorine pesticides and PCBs - EPA Method 8080 <br /> Volatile organic compounds - EPA Method 8240 <br /> Title 26 Metals and Cyanide <br /> Ditz Brothers will make available to the San Joaquin County <br /> Department of Environmental Health information to pertaining to <br /> the proposed drilling, sampling, and subsequent analysis of the <br /> groundwater from the wells . This information will include <br /> lithologic logs of the material encountered, well construction <br />