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AOC Work Plans <br /> In December 2000,AGE conducted additional sampling in the maintenanc building septic leach <br /> field that included collection of two soil samples(at depth of 15 and 30 fet t bgs)and one grab <br /> groundwater sample from one boring(LP4)drilled in the septic leach field, Samples were <br /> analyzed for TRPH,VOCs,formaldehyde,chromium,lead,and zinc. Soil samples were below <br /> reporting limits for VOCs,TRPH, and formaldehyde,while chromium,le ,and zinc were <br /> detected at concentrations below PRGs. With the exception of low concer.trations of chromium, <br /> lead,and zinc, all requested compounds were below laboratory reporting limits for the groundwater <br /> sample. The metals sample was not filtered prior to analysis and therefore,results were not <br /> considered representative of dissolved metals concentrations in groundwa . <br /> Millwork Building Septic Tank—Active <br /> Kleinfelder reported that the Millwork leach field may have received pain or urea formaldehyde <br /> glue rinse water and that the materials were not discharged to the system after 1986. In July 1987 <br /> Kleinfelder collected soil samples at depths of 6, 10 and 15 feet bgs from one soil boring(boring <br /> location not displayed in Kleinfelder report)located within the leach field associated with Millwork <br /> Building operations(Kleinfelder, 1992). The samples were analyzed for rmaldehyde, chromium, <br /> lead,and zinc. The metals chromium,lead, and zinc,were detected at cor centrations reported to <br /> be within background concentrations. Formaldehyde was detected at con entrations 26 and 43 <br /> mg/kg,below the residential PRG of 9,200 mg/kg. <br /> In June 2000,AGE collected two soil and one groundwater sample from a Millwork Building <br /> Septic leach field area. The groundwater sample(LP4)was collected at a depth of approximately <br /> 40 feet bgs and analyzed for VOCs,TRPH,formaldehyde, chromium, leai I and zinc. <br /> Formaldehyde,TRPH,chromium,lead, and zinc were detected at concentrations of 4.7, 15, 1.17, <br /> 0.1,and 1.2 mg/L respectively,VOCs were not detected above the labors ry reporting limits. <br /> None of the detected compounds exceeded their respective PRGs or MC <br /> Draft <br /> K1361125 workplan-ESC MACTEC Engineering and Consulting, Inc. 25 <br /> September 28,2005 <br />