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� �ti:�s �sxt�aer�aavc:a <br /> Lammersvilfe School District <br /> July 16, 1990 202/899-7004 <br /> 11 <br /> i <br /> TABLE 4 <br /> _. GROUNDWATER MONITORING DATA <br /> 1i (in feet) <br /> WELL DEPTH TO WATER TABLE <br /> DATE ID ELEVATION' WATER <br /> ELEVATION <br /> -- <br /> 6/21/90 MW-1 100M <br /> _ <br /> MW-2 99.94 7.69 92.31 <br /> 7.61 92,33 <br /> MW-3 <br /> 100.14 7.27 <br /> MW-4 100.82 7.78 4" 4 92.87 <br /> MW-S 98.0693.04 <br /> MW-6 99.07 6.73 H 6N 91.33 <br /> M W-7 99.72 7.16 91.91 <br /> M W-8 7.34 92.38 <br /> A 99.75 7.43 92.32 <br /> Survey elevation from center of street box (to grade). <br /> Survey marker is 1MW-1 located adjacent to former underground gasoline tank; arbitrary datum <br /> of 100 feet used at this paint. <br /> 5.7 GROUNDWATER SAMPLING <br /> �» <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 purges dry after removing four gallons of water and <br /> .� one-half gallas of water,respectively, The groundwater in these wells was allowed to recharge a? feast <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-mflliliter (ml) glass vials, and i-liter <br /> amber glass bottles. Fifty percent hydrochloric acid (HCL)was added to the 40-m1 glass vials until a pH <br /> of less than 2 was achieved, The 40-mi glass vials were capped with TeflonR-lined caps so that no air was <br /> trapped inside. The samples were labeled,preserved on ice,and defivefed with the appropriate Chain-of <br /> Custody manifest to GTEL for subsequent analysis. Groundwater samples obtained from all eight wells <br /> were analyzed for TPH-D using modified EPA Method 8015, and TPH-G and BTEX using EPA Methods <br /> 5030/8015/8020. <br /> Re,. CROUND1t'A-rER <br /> TECHNOLOGY,INC. <br />