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AOC Work Plans <br /> • The maximum detections of 1,2-DCA have declined from previou monitoring events and <br /> the absence of 1,2-DCA in Well DMW-8 (new deep well)indicate a lack of vertical <br /> migration. <br /> Based on this data,URS indicated there was sufficient information to subn it a request for No <br /> Further Action(NFA)for USTs 18820002 and 18820005. <br /> On March 3,2005,URS submitted Third and Fourth Quarter 2004 Groun ater Monitoring <br /> Report,Former American Forest Products Facility, Stockton, California RS, 2005b). This report <br /> detailed the results of groundwater monitoring for the period between September and December <br /> 2004. Based on the results of the additional monitoring,URS concluded U at concentrations of 1,2- <br /> DCA continued to decrease and not be detected in the deeper aquifer indic iting a lack of vertical <br /> migration. Based on this data,URS recommended that the UST site be coi isidered for closure. <br /> Response from the regulatory agencies is pending. <br /> AFPC remains the responsible party for this UST site. <br /> UST 18820003 <br /> This 4,000-gallon gasoline UST formerly located east of the boiler room late 2)was removed in <br /> 1994. Soil contamination was not detected in excavation confirmation sar iples collected beneath <br /> the former UST(AGE, 2001). As discussed above,no formal closure lettr has been issued for <br /> this UST;however,according to the PHS-EHD,there are no outstanding i sues related to any of <br /> the USTs(with the exception of USTs Number 0002 and 0005). <br /> UST 18820004 <br /> This former 500-gallon diesel UST that was located near the boiler room E nd near UST 18820003 <br /> discussed above(Plate 4.1.2). The UST was removed under permit on M y 11, 1988. A soil <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 18 <br /> September 28,2005 <br />