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3-5 14 ft-bgs) indicated the presence of other hydrocarbons in addition to gasoline fraction hydrocarbons 3 2 2 Former Brine Discharge Area Approximately 45,000 gallons of brine were reportedly discharged to the ground surface on two separate occasions in 1982 These discharges occurred southwest of the office building (Figure 3) and were addressed in this investigation by sampling Borings SB-5 and SB-4 (SB-4 was subsequently converted into Monitoring Well MW-3) Soil samples were collected from depths of 0 to 2 ft-bgs, 8 to 10 ft-bgs, and 16 to 18 ft-bgs from these borings and analyzed for RCRA metals (arsenic, banum, cadmium, chromium, lead, mercury, selenium, and sil- ver), hexavalent chromium and ammorua (Table 1) The results of these analyses are sum- manzed in Table 6 The results of the analyses for the RCRA metals indicated that no detectable concentrations of cadmium, lead, selenium, or silver were present in any soil sample In addition, hexava- lent chromium was not detected in any sort sample Laboratory analyses indicated that con- centrations of arsenic were uniform among each of the soil samples and ranged from 3 1 to 4 2 mg/kg Chromium was detected m each of the soil samples at concentrations ranging from 25 to 49 mg/kg, the samples with the highest chromium concentrations in samples col- lected from a depth of 8 to 10 ft-bgs and the soil samples with the lowest concentrations of chromium were collected from a depth of 16 to 18 ft-bgs in both borings Barium concentra- tions in soil samples ranged from 44 to 94 mg/kg and showed no general pattern of occur- rence Concentrations of mercury were detected in all but one soil sample from 0 02 mg/kg (the lower limit of detection) to 0 11 mg/kg Concentrations of ammonia as nitrogen were detected m each soil sample except for the sam- ples collected from a depth of 16 to 18 ft-bgs in both borings Concentrations of ammonia ranged from 3 8 to 21 mg/kg in soil samples The detected concentrations of ammonia decreased with depth of samples in this area 29025 r "REALISTIC SOLUTIONS FOR HAZARDOUS WASTE PROBLEMS