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' KOPPEL STOCKTON TERMINAL <br /> Work Plan for Monitoring Well Installation <br /> ' Introduction <br /> ' The Koppel Stockton Terminal is a former dry fertilizer warehouse serving the Port of <br /> Stockton,an industrialized area involved in the Central Valley's agricultural economy. The <br /> site is located west of Ventura Avenue,between the extensions of Hazelton Avenue and <br /> Sonora Street,approximately 1 mile west southwest of the I-5/Highway 4 interchange(see <br /> Figure 1). <br /> ' In response to a request from a 22 July 1998 letter from David Stavarek, Regional Water <br /> Quality Control Board (RWQCB) to Leah Goldberg,this work plan was prepared to <br /> describe the planned installation of seven additional groundwater monitoring wells in the <br /> ' vicinity of the Koppel Stockton Terminal site.One monitoring well,KP-BG1,is a <br /> background well for shallow groundwater at the site. Wells KP-5S, -7S,and—8S are <br /> planned shallow monitoring wells. Wells KP-5D, -6D,and—71)are planned deep <br /> monitoring wells. Deep is defined here as monitoring groundwater between about 45 to 60 <br /> feet below ground surface (ft-bgs). <br /> ' In addition to monitoring well installation,soil sampling is planned for several locations at <br /> the Koppel Stockton Terminal site. <br /> Monitoring Well Installation <br /> Seven monitoring wells will be installed at the locations shown in Figure 2. The proposed <br /> well construction is shown in Table 1. The methodology for well installation will not be <br /> repeated here.The methodology follows that was outlined in the Work Plan for the <br /> Environmental Investigation at the Koppel Stockton Terminal (CH2M HILL,May 1996). Shallow <br /> ' monitoring wells will have a 10-foot screened interval from approximatelu 10 to 20 ft-bgs.A <br /> schematic of the proposed well construction is shown in Figure 3.Deep monitoring wells <br /> will be screened over a 10-foot interval between 45 to 60 feet below ground surface <br /> ' depending on the formation encountered during drilling. Elevations of new monitoring <br /> wells well be surveyed following well construction. <br /> During drilling of the offsite wells to the west of the Koppel Stockton Terminal property, <br /> ' soil samples will be collected from depths of 1, 2,4,and 6 feet and field analyzed for nitrate <br /> and ammonia. The results of the field screening will be compared to results from the <br /> Koppel Stockton Terminal site sampling for soils. <br /> ' RDD\E:1144002\PIELDINVESTIGATIDNWEW MW-$OILWKPLAN.DOC 1 <br />