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AOC Work Plans The two soil samples(LP4-30 and LP5-12)were collected at depths of 12 and 30 feet bgs and analyzed for formaldehyde,TRPH,VOCs,chromium, lead,and zinc. For aldehyde,TRPH, chromium, lead,and zinc were detected at maximum concentrations of 4. ,26,70, 1.3, and 45 mg/kg respectively,below their respective residential PRG or background level. VOCs were not detected above laboratory reporting limits in either sample. In December 2001,AGE installed an additional boring(PB-7)in the Mill ork Building Septic leach field and collected a grab groundwater sample from the boring. The sample was analyzed for formaldehyde,and the dissolved metals chromium, lead,nickel and zinc o aly. All requested compounds were below laboratory reporting limits in the sample. Finger Joints Building Septic Tanks—Inactive In 1987,both D&M and Kleinfelder proposed sampling of soil and groundwater in the vicinity of the Finger Joints building septic leach field. No copies of either report or any other direct references to the results of their investigation were available for review. During December 2000 site assessment activities,AGE collected soil les at depths of 15 and 25 feet bgs and grab groundwater samples from the septic leach field east f the Finger Joint Building/Box Factory(Plate 4.1.3). All soil and groundwater samples wee analyzed for TRPH, formaldehyde,TCP,TCE,PCE and metals.With the exception chromium lead and zinc detected at concentrations considered to be background,none of the requested corn pounds were detected in analyzed samples(AGE, 2000). The groundwater sample also contained elevated concentrations of all total metals. The metals sample was not filtered prior to analysis and i ere therefore,not considered representative of dissolved metals concentrations in groundwa er. Draft KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 26 September 28,2005