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15 January 1997 <br /> AGE-NC Project No 95-0137 <br /> ' Page 3 of 6 <br /> benzene and xylenes BTE&X)with methyl tertiary butyl ether(MTBE) Soil samples were analyzed <br /> in accordance with EPA Methods 5030/8015m and 8020, ground water samples were analyzed in <br /> accordance with methods EPA Methods 5030/8015m and 602 <br /> Two soil samples were also transmitted under chain-of-custody to A Keith Kaufman for analysis <br /> of microbiological and physicochemical parameters Data obtained from the microbiological and <br /> ' phsicochemical analysis will be used to evaluate effectiveness of bioremediation as a remediation <br /> alternative <br /> 2 5 MONITORING WELL DEPTH MEASUREMENTS AND PURGE PROCEDURES <br /> ' On 19 December 1996, a Solmst water level meter was used to measure the depth to ground water <br /> in wells MW-1 through MW-5 The relative ground water elevation in each well and the hydraulic <br /> gradient were calculated from the casing elevations surveyed relative to an arbitrary datum and these <br /> ' data - <br /> After depth measurements, each monitoring well was purged of approximately 10 gallons of water <br /> (a minimum of three well volumes)using a pre-cleaned submersible pump Temperature, pH, and <br /> conductivity were measured at approximately two-gallon intervals using an ICM Water Analyzer <br /> Model No 52200 Purge water stabilization data and field data sheets are included in Appendix B <br /> Purged water was stored on-site in a 55-gallon drum <br /> ' 2 6 GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> ' Following purging,water samples were collected from each vvell using new, clean, disposable plastic <br /> bailers Each sample was transferred into three 40-m1 EPA-approved vials and one 1-liter amber <br /> bottle Samples were stored in a chilled container, under ice and transported under chain-of-custody <br /> ' to MAI Each sample was analyzed for TPH-g and TPH-d, and for BTE&X with MTBE in <br /> accordance with EPA methods 503018015, and 602, respectively <br /> 30 FINDINGS <br /> ' 3 1 SOIL PROFILE <br /> ' Light brown, clayey, fine-grained sand and gray, fine-grained sand were encountered in throughout <br /> the entire depth of probe borings B14 and B15, brown, fine-grained sand was encountered <br /> throughout probe boring B 16,probe boring B 17 was comprised of mostly brown and tan silty, fine- <br /> ' <br />