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GEOSYNTEC CONSULTANTS ' Ms. Amy Terrell 5 October 2004 Page 4 Site stratigraphy below about 35 ft bgs has not yet been explored and the potential vertical extent of site-related chemicals in groundwater has not yet been investigated. At the location shown on Figure 2, one cone penetrometer test (CPT) hole will be continuously logged to a depth of about 80 ft. This maximum depth of investigation was selected based on the well survey that was performed previously and which indicted that a permeable stratigraphic zone may be present at about this depth. The ' objective of the CPT is to explore and characterize the stratigraphy underlying the saturated zone monitored by the existing site monitoring wells. If a permeable zone is encountered,then a grab groundwater sample will be collected. ' The upgradient properties to the west and southwest of the site are shown on Figure 3. The location of any new upgradient well is dependant on working out appropriate ' access, and current site features. If the upgradient property owner(s) does not allow the installation of a monitoring well, then we will request access for up to three direct push grab groundwater sample locations. GeoSyntec will submit to the RWQCB a supplemental plan for the upgradient investigation, after resolving upgradient property access. ' Existing monitoring well MW-5 is located in the JTF facility office parking lot, adjacent to and west of South Argonaut Street (Figure 2). The RWQCB has requested ' an additional monitoring well, downgradient of MW-5, to delineate the extent of nitrate in groundwater. As shown in Figure 3, all parcels located to the east and northeast (downgradient) of the site and MW-5 are residential. As reported previously5, these ' residences are serviced by California Water Service Company, and no domestic water supply wells have been identified in the area between MW-5 and South Stockton Street. To meet the RWQCB request for delineation of nitrate downgradient of MW-5, and considering the downgradient density of residential land use, we propose to collect three direct push grab groundwater samples from the closest downgradient public right-of- way in South Stockton Street, approximately 800 to 1000 feet northeast of MW-5 ' (Figure 3). ' 5 GeoSyntec Consultants, 2000. "Well Installation Report, John Taylor Fertilizer Co., Inc., 1819 South Argonaut Way, Stockton, California." 14 July. • PAPRJ2003REM\Wi1bur-E11is\Wr0250(JTF)\STOCKTON\S LF Oct 2004 Work Plan\Oct 04 Work Planb.doc `k `, RECYCLED MID RECYCLABLE