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i 3-7 Results of metals analyses indicated that total selenium, cadmium, lead, and silver were not detectable in any ground water sample collected Total mercury and total hexavalent chro- mium were detected at concentrations near their respective detection limits (mercury, 0 0002 mg/f and hexavalent chromium, 0 01 mg/f) in the ground water samples collected from Monutonng Wells MW-3 and MW-2, respectively Barium was the only metal detected in the ground water sample collected from the supply well system (0 05 mg/f) The concentra- tions of banum in other ground water samples ranged from 0 79 to 1 6 mg/1 Total chro- mium was detected in each ground water sample collected from monitoring wells and ranged from 0 15 to 0 25 mg/f Total arsenic was also detected in each ground water sample col-lected from a monitoring well and ranged from 0 015 to 0 054 mg/f TCL VOCs analyses for the ground water samples collected indicated the detection of VOCs in the ground water sample collected from Monitoring Well MW-1 These VOCs were ben- zene (7,400 micrograms per liter [jaglf]), toluene (6,300 µglf), ethylbenzene (2,000 pglf), and total xylenes (9,000 ,ug/f) TCL VOCs (including the BTEX constituents) were not de- tected in the ground water samples collected from Monitoring Wells MW-2 and MW-3 3 3 2 Supplemental Phase H Investigation Based on the detection of BTEX constituents in the ground water sample collected from Monitoring Well MW-1 during the initial Phase II Investigation, additional monitoring wells were installed and a second ground water sampling event was completed Ground water samples were collected from Monitoring Wells MW-1 through MW-6 on August 26, 1994 and analyzed for TPH-purgeable fuels as gasoline, TCL VOCs, and total (unfiltered) lead (Table 3) The analytical method used for analysis of lead during this sampling round per- mitted a lower detection limit than the analytical method used in the initial Phase II Investigation. TPH-purgeable fuels as gasoline was detected in the ground water sample collected from Monitoring Well MW-6 at a concentration of 4,700 µgl f (Table 8) Analysis of the ground water sample collected from Monitoring Well MW-6 also indicated the presence of "high boiling point" hydrocarbons in addition to the detected quantity of TPH-purgeable fuels 29025 • "REALISTIC SOLUTIONS FOR HAZARDOUS WASTE PROBLEMS"