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02 November 1999 AGE-NC Project No. 99-0628 Page 7 of 8 5.3.5. RCRA Metals Barium, cadmium, chromium and lead were detected in the composite stockpile samples at concentrations ranging from 1.0 mg/kg (cadmium, SP-1-2)to 450 mg/kg (barium, SP-1-2).Arsenic, mercury, selenium or silver were not detected in either sample. 6.0. CONCLUSIONS On the basis of the information collected during this investigation, AGE concludes: • Three dry wells were originally installed on the site to a depth of approximately 25 feet bsg and were used to discharge overflow wastewater from the former above-ground clarifier at the site. • The dry wells were constructed using a 4-inch diameter PVC casing and a "filter pack" of gravel and sand. The three dry wells were connected in series, and according to representatives of Western Square Industries, were fitted with valves to direct the discharge water to each dry well -- independently. • Only very low concentrations of TPH-g, toluene and xylenes were detected by EPA Method 8020 in soil samples collected beneath the dry wells. Benzene was detected in the sample collected beneath dry well DWI at 26 ,ug/kg by EPA Method 8260. • Significant concentrations of longer-chain hydrocarbons(TPH-d and TPH-mo)were detected in soil samples collected beneath each dry well. The highest concentrations of longer-chain hydrocarbons were detected in soil samples collected beneath dry well DWI. • Concentrations of several VOC compounds, including butyl benzenes and trimethylbenzenes, were detected in soil samples collected beneath each dry well. The highest concentrations of VOCs were detected beneath dry well DWI. • Only a low concentration of one SVOC analyte, bis(2-ethylhexyl)phthalate, was detected at the site, in a soil sample collected from beneath dry well DWI-28. • No detectable concentrations of TPH, BTEX, VOCs or SVOCs were reported in the sample collected beneath the discharge line at boring Bl. • Detected concentrations of RCRA metals at the site do not appear to pose an environmental concern. • Low concentrations of TPH-g, BTEX and VOCs were detected in soil excavated from the dry wells and stockpiled on site. Advanced CeoEnvironmentai,Inc.