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Lammersville School District 2021899-7004 <br /> July 16, 1990 11 <br /> f <br /> k <br /> TABLE 4 <br /> GROUNDWATER MONITORING DATA <br /> (in feet) <br /> WELL DEPTH TO WATER TABLE <br /> DATE ID ELEVATION' WATER -ELEVATION <br /> 6121190 MW-1 10000 769 9231 <br /> MW-2 9994 761 9233 <br /> MW-3 10014 727 9287 <br /> MW-4 10082 778 °4' 9304 <br /> MW-5 9806 673 H16" 9133 <br /> -- MW 6 9907 716 9191 <br /> MW-7 9972 734 9238 <br /> MW 8 9975 743 9232 <br /> Survey elevation from center of street box (to grade) <br /> Survey marker is MW 1 located adjacent to former underground gasoline tank arbitrary datum <br /> of 100 feet used at this point <br /> 5 7 GROUNDWATER SAMPLING <br /> ,. Following groundwater monitoring approximately 20 to 30 gallons of water was purged from each <br /> of wells MW 3 through MW 8 MW-1 and MW-2 were purged dry after removing four gallons of water and <br /> one-half gallon of water, respectively The groundwater in these wells was allowed to recharge at least <br /> 80 percent of the measured static water level before being sampled The groundwater samples were <br /> collected with an EPA-approved TeflonR sampler and placed in 40 milliliter (ml) glass vials, and 1 Mer <br /> amber glass bonle& Fifty percent hydrochtoric acid(HCL)was added to the 40-mf glass vials until a pH <br /> of less than 2 was achieved The 40 ml glass vials were capped with Tellono lined caps so that no air was <br /> trapped inside The samples were Labeled preserved on ice and delivered with the appropriate Cham of <br /> Custody manifest to GTEL for subseluent analysis Groundwater samples obtained from all eight wells <br />. were analyzed for TPH D us ng modifieG EPA Method 8015 and TPH G and STEX using EPA Methods <br /> 5030/801518020 <br /> Tf Cit\ill O(;� I\C <br />