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• 41 <br /> KOPPEL STOCKTON TERMINAL <br /> Monitoring Well Installation Work Plan <br /> Addendum <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 /> CH2M HILL is submitting this Monitoring Well Installation Work Plan Addendum for the <br /> installation of two monitoring wells(KP-11S and KP-12S) at or north of the site. This report <br /> is an addendum to the Monitoring Well Installation Work Plan (CH2M HILL,2004),which <br /> proposed installation of well KP-10S and was submitted in November 2004.The Monitoring <br /> Well Installation Work Plan was approved by the Regional Water Quality Control Board <br /> (RWQCB) in December 2004. <br /> This addendum identifies the proposed locations of monitoring wells KP-11S and KP-12S <br /> and the rationale for installation of these wells. Following regulatory approval of this report, <br /> these wells will be installed in June 2005, coincident with installation of monitoring well KP- <br /> 10S.The well drilling,well construction, and well development procedures presented in the <br /> Monitoring Well Installation Work Plan will be followed during installation and development <br /> of wells KP-11S and KP-12S. <br /> Rationale for Well Installation <br /> Monitoring wells KP-11S and KP-12S are proposed for installation at the locations presented <br /> on Figure 1. Analytical and monitoring data recorded for these wells,in conjunction with <br /> data recorded for other wells in the area,will be used to assess the groundwater flow <br /> direction north of the Koppel Stockton Terminal and to assess whether the extent of the <br /> nitrate plume at Koppel is adequately defined to the north.Wells KP-11S and KP-12S will be <br /> screened at a depth interval of approximately 6 to 21 feet below ground surface. <br /> The former Cal Farm Supply facility is located north of the Koppel Stockton Terminal. <br /> Elevated concentrations of nitrate-nitrogen have been detected in groundwater collected <br /> between 1997 and 1999 from Cal Farm Supply's southernmost monitoring well,MW-6. <br /> Monitoring well MW-6 was inadvertently destroyed in 1999.Monitoring well KP-12S will <br /> be installed near the former location of well MW-6 to assess the existing nitrate <br /> concentrations in the seasonal ponding area north of Koppel. <br /> References <br /> CH2M HILL. 2004.Monitoring Well Installation Work Plan,Koppel Stockton Terminal. <br /> November. <br /> FDMWELLWP ADDENDUKDOC t <br />