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AOC Work Plans <br /> TPHd,TPHmo,VOCs, SVOCs, formaldehyde,chromium,copper,lead,ni ckel,and zinc. TPHd, <br /> formaldehyde,and dissolved chromium were detected at concentrations of 51, 150,and 95 µg/L, <br /> respectively in the sample. Formaldehyde and dissolved chromium were j ist above their <br /> respective action levels. No other requested compounds were detected above detection limits in the <br /> sample. <br /> South and Central Storm Water Basins <br /> No previous investigations were performed in either the southern or centra storm water basin. <br /> Data Gaps <br /> Data Gaps for the storm water ponds are as follows: <br /> • North Storm Water Basin—Although analytical results for surface m ater samples collected <br /> from the pond were below PRGs,there is no information to indicate st diment samples have <br /> been collected from the pond. Sediment samples should be collected I rom the pond to assess <br /> potential impacts from past runoffs to the pond. <br /> • South and Central Storm Water Basins—No samples have been cc ected from the South <br /> and Central Storm Water Basins to assess whether there has been an ir ipact to the soil and <br /> surface water from storm water runoff or their occasional uses as bum pits. <br /> Field Investigation Approach <br /> Field sampling will be performed at the Storm Water Retention Ponds as llows: <br /> • North Storm Water Basin—Two sediment samples will be collected from the north Storm <br /> Water basins and analyzed for VOCs, SVOCs,phenols, formaldehyde TPHd,TPHmo,and <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 48 <br /> September 28,2005 <br />