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' 11 September 2001 AGE-NC Project No. 98-0466 ' Page 9 of 24 In the AGE-prepared Phase H Site Assessment Report - Septic Leach Fields and Drainage Ditch, ' dated 26 October 2000, AGE reported the analytical results from soil and ground water samples collected from the septic tank leach field west of the Millworks building.n One grab ground water sample was collected at a depth of approximately 40 feet bsg (LP4) TRPH was detected at a ' concentration of 15 milligrams per liter(mg/1). Total chromium was detected at a concentration of 1.17 mg/l. The sample was not analyzed for dissolved chromium. Lead was detected in the ground ' water sample at 0.10 mg/l.The sample was not filtered prior to analysis, the metals results include total metals from entrained mineral grains and are not represent tive of dissolved metals concentrations. ' Neither PCP nor TCP were detected in the ground water sample. Zinc concentrations in the ground water sample did not exceed environmental guidelines. Formaldehyd at 4.7 mg/l exceeded the Action Level of 1 mg/1 in the ground water sample.Table 2 shows the alytical data obtained from the October 2000 samples, Figure 4 shows the sample localities. AGE roposes a boring(PB7) in the area to recheck the formaldehyde detection. 1 3.3.3. Maintenance Building Septic Leach Field - Active ' On 05 December 2000, AGE collected soil and grab ground water samples from the septic leach ' field east of the active maintenance building located on the northerm portion of the property. Analyzed samples did not contain detectable concentrations of TRPH,f rmaidehyde,TCP,TCE or PCP. Concentrations of metals, including chromium, lead and zinc were all within background ' values for soil samples. Concentrations of metals in ground water samples were above MCLS and PRGs for tap water for each metal analyte;however,the ground water s ples were not filtered prior to analysis, so the metals results include total metals from entrained mineral grains and are not representative of dissolved metals concentrations. Table 2 shows the analytical data obtained from the December 2000 samples. A report of procedures and findings for the December 2000 investigation is in preparation. AGE believes the area to have been misidentified as a potential ' receptor of contaminants(See Site Environmental History,dated 04 Mai 2001,discussion of septic tanks)and that the area has been adequately assessed and does not prop se any additional sampling in the area. 3.4. WASH-DOWN AREAS According to Kleinfelder (1992), rinse water generated during cleaning of glue application equipment, priming equipment and saw blades was discharged onto surface soils at five separate ' locations at the site. The areas considered by Kleinfelder (1987), based on the D&M Phase H Investigation (1987) report, as having potential contamination were located east of the Ray Bond building,north of the Millwork building,south of the Priming building,westofthe Saw Filing room ' Advanced GwEnvironmental,Inc. 1