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KOPPEL-STOCKTON TERMINAL <br /> Monitoring Well Abandonment and <br /> Construction Work Plan <br /> 1.0 Background <br /> The Koppel Stockton Terminal(Koppel)is a former dry fertilizer warehouse.The site is <br /> located in Stockton west of Ventura Avenue,between the extensions of Hazelton Avenue <br /> and Sonora Street,approximately 1 mile west-southwest of the I-5/Highway 4 interchange, <br /> next to the Port of Stockton,California. The site layout of the Koppel Stockton Terminal is <br /> presented on Figure 1. <br /> A test grove of 267 poplar trees was planted on approximately 1 acre on the southern end of <br /> the site in May 1998 to evaluate the effectiveness of phytoremediation in removing nitrogen <br /> from soil and groundwater. An additional 1,250 hybrid poplar trees and 230 willow trees <br /> were planted near the turnaround area,stormwater pond,former bagging plant,and in the <br /> area north of the warehouse from March through June 2000. <br /> As shown on Figure 1,the current monitoring well network at Koppel consists of 11 shallow <br /> monitoring wells (KP-1R,KP-2,KP-3,KP-4, KP-5S,KP-7S, KP-8S,KP-9S,KP-10S,KP-12S, <br /> and KP-BG-1),3 deep monitoring wells(KP-5D,KP-6D,and KP-7D), and 5 piezometers <br /> (TG-1,TG-2,TG-3,TG-4,and TG-5). <br /> In September 2004,the Regional Water Quality Control Board (Water Board) approved <br /> reducing the sampling and monitoring frequency for all wells from semiannual to annual <br /> (Water Board,2004). Annual groundwater sampling and monitoring occur during the third <br /> quarter of each calendar year. Furthermore,the Water Board approved suspending ground- <br /> water quality monitoring for Monitoring Wells KP-7S,KP-7D,and KP-8S because of the low <br /> nitrogen levels that have been recorded at these wells (MRP No. R5-2004-0835;Water Board, <br /> 2007).The depth to groundwater continues to be monitored annually in these wells. <br /> Monitoring Well Pair KP-5S and KP-5D, located on Burlington Northern Santa Fe Railway <br /> (BNSF) property,could not be monitored in August 2007,2008,or 2009 because they were <br /> covered by a dirt access road realigned during railroad construction between the March and <br /> August 2007 sampling events. <br /> Monitoring Well KP-BG-1,located on a vacant lot northeast of the site,was damaged after <br /> the August 2008 monitoring event and could not be sampled in August 2009. It is suspected <br /> that Monitoring Well KP-BG-1 was damaged during construction activities at the adjacent <br /> property. Monitoring Well KP-10S could not be sampled in August 2009 because the well <br /> was buried and possibly damaged or destroyed during routine grading of the area. <br /> Additional detail regarding the damaged and buried wells,the current monitoring well <br /> network,and previous sampling results is provided in the 2009 Annual Groundwater <br /> Monitoring Report(CH2M HILL,2009). <br /> RDMI D2M06(CLR4507.D0C%) <br /> cs[eieiaiexsenw <br />