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0 <br /> Ms.Lori Duncan <br /> San Joaquin County <br /> Environmental Health Deparment <br /> October 15,2010 <br /> Page 3 of 3 <br /> be based on field evidence of petroleum hydrocarbon contamination such as discoloration, odors, and <br /> FID readings, as well as lithologic changes. <br /> One groundwater sample will also be collected from the boring nearest the clarifier (LPBl) and <br /> analyzed for the constituents listed above. The sample will be collected by driving the sampler to the <br /> desired depth and exposing the screen to the formation. The groundwater sample will be collected <br /> using a length of 0.17 inner diameter tubing equipped with a stainless steel bottom check valve. The <br /> tubing will be inserted into the probe rods and pushed to the bottom of the sampler to the desired <br /> depth. The groundwater sample will be brought to the surface by gripping the top of the tubing and <br /> rapidly moving the tubing up and down creating a positive displacement effect, thereby forcing the <br /> water sample to the surface where it will be collected directly into the sample containers. If the <br /> formation does not readily yield groundwater using the above method, then a temporary well casing <br /> (3/4-inch to 1-inch diameter) may be placed into the bore hole in an effort to collect the groundwater <br /> sample. Additional groundwater samples may be collected from other borings at the discretion of the <br /> registered Professional Geologist overseeing the project. <br /> Borings will be backfilled to the ground surface with neat cement grout, using a tremie pipe, when <br /> necessary, to place the grout in the lower portions of the boring (below 30 feet bgs). All sampling and <br /> drilling equipment will be washed thoroughly with laboratory-grade detergent and water between uses <br /> to minimize the potential of cross contamination. All field work will be conducted in accordance with <br /> the Site Safety Plan included in Attachment B. <br /> A technical report describing field activities, analytical results, conclusions and recommendations will be <br /> submitted to Fremont Gate LLC and Ms.Lori Duncan of EHD. <br /> Please feel free to call John Lane of Lee & Pierce, Inc. at 209-848-8270 if you have any questions <br /> regarding this submittal. <br /> Sincerely, <br /> �oN P "yo LEE&PIERCE INC. <br /> * <br /> No.GM <br /> Nj9 �Q. John P. Lane,PG <br /> �i CAUF Cnlifnrnin Pmfesainnal Genlnvist 6795 <br /> JPL <br /> Attachments <br /> cc: Fremont Gate LLC <br /> ENI0759 WP1010 <br />