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AOC Work Plans <br /> With the exception of the Drain Sump North of the 44xl20 Storage Buildi 1g,four near soil <br /> samples will be collected at a depth of approximately one-foot bgs from a ch wash area. Soil <br /> samples for all areas requiring further work will be analyzed for TPHg, d and TPHmo <br /> (including silica gel cleanup for TPHd and TPHmo). In addition,the Prim g Building samples <br /> will also be analyzed for VOCs,SVOCs,phenols,and formaldehyde. <br /> 4.6 Storm Water Retention Ponds <br /> Site Summary <br /> Three storm water ponds,located in the north,central,and south portions f the site,have been <br /> utilized for storm water runoff(Plate 4.6). The north storm water pond cu Tently receives surface <br /> runoff from the northern half of the site and it was speculated that it may b ave received traces of <br /> wastes(Kleinfelder, 1992). Communications with AMMC personal indic to that the ponds were <br /> not utilized production related. The central and southern storm water pon were occasionally used <br /> as bum pits for wood waste. <br /> Previous Investigations <br /> North Storm Water Basin <br /> In 1992,Kleinfelder collected two surface water samples for analyses of P CP,formaldehyde, <br /> volatile halocarbons and aromatics,chromium lead, and zinc. All detecte concentrations were <br /> below their respective regulatory action/cleanup levels for both samples. Low concentrations of <br /> PCP (1.5 µg/L),formaldehyde (47 and 60 µg/L),and zinc(14 and 21 µ ),were detected. <br /> According to Kleinfelder,the pond contained reeds, small fish and aquatic life at the time of <br /> sampling. <br /> In December 2001,AGE installed a boring(PB-12)in the vicinity of the ri orth storm water basin <br /> and collected a grab groundwater sample from the boring. The sample w analyzed for TPHg, <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 47 <br /> September 28,2005 <br />