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. 01 June 2001 <br /> AGE-NC Project No 95-0128 <br /> Page 3 of 5 <br /> Ground water was inferred to be flowing approximately northeast m both the properly screened wells <br /> and the deeply screened wells (Figures 3 and 4) The gradient for the properly screened wells was <br /> approximately 0 003 ft/ft The giadlent determined for the drowned or submerged wells was <br />' approxirnately 0 002 ft/ft <br /> 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br /> The analytical results from the ground water samples are as follows <br />' • Dissolved petroleum hydrocarbons were detected in samples from monitoring wells MW-2 <br /> , <br /> MW-3, MW-4, MW-5, and MW-6 and vapor well VW-I <br /> • In general, the highest concentrations of hydrocarbons were detected in the water samples <br /> collected from monitoring wells MW-4 and MW-5, (on the northeastern and eastern portion <br /> of the site), which contained 15,000 microgram per liter (µg/1) and 3,300 µg/1 TPH-g, <br /> respectively Samples from vapor well VW-1 and ground water extraction well EW- <br /> . 1contalned 1,000 µg/1 and 5,700 p.g/l TPH-g, respectively <br /> p TPH-d was detected at concentrations as high as 4,600 µg/l (EW-1) <br /> o Benzene was detected In samples from wells MW-2, MW-4 and MW-5 and vapor well VW- <br /> 1 and ground water extraction well EW-1 at concentrations ranging from 1 0 µg/l (MW-2) <br /> to 90 gg/1 (EW-1) <br /> I + MTBE was detected by EPA Method 8020 In ground water samples collected from <br /> monitoring wells MW-2, MW--3, MW-5, MW-6, vapor well VW-1 and ground water <br /> extraction well EW-1 on-site and MW-8, MW-11A, MW 11 B, MW 12A and MW-12B off <br /> Isite Detected concentrations of MTBE ranged from 5 7µg/1(MW-3) to 1,400 gg/1(EW-1) <br /> • MTBE was detected by EPA Method 8260 In all ground water samples collected with the <br />' exception of monitoring wells MW-1, MW-9 and MW-10 Detected concentrations of <br /> MTBE ranged from 1 44g/'l (MW-7) to 1,700 µg/1 (EW-1) <br /> • No other fuel additives were detected in the ground water samples analyzed from the April <br /> 2001 monitoring event <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons are sunmi=ed m Tables <br /> 2 and 3 The laboratory reports for the quarterly monitoring event (MAI Lab IDs 66117 to 66132) <br /> quality assurance and quality control (QA/QC) reports and the chain-of-custody form are included <br /> m-Appendix B -- -—� _—_ --- _ - ---- - - - — -— ---- - - -- -- <br /> Advanced GeoEnvnronmental Inc <br />