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GEoSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 5 October 2004 <br /> Page 2 <br /> Water Quality Control Board, Central Valley Region(RWQCB) approved GeoSyntec's <br /> ' work plan with modifications, and also requested a proposal for: additional monitoring <br /> wells to define the downgradient extent of site-related compounds; delineating the <br /> contaminants of concern in the operations area; and defining upgradient water quality,. <br /> In December 2003, GeoSyntec implemented the grab groundwater sampling <br /> program to investigate the downgradient extent of site-related compounds in <br /> groundwater. Groundwater samples were collected at six locations along South <br /> Argonaut Street, northeast of the site (Figure 2). One sample was also collected onsite <br /> ' in the northeast corner of the facility. The direction of groundwater flow at JTF <br /> Stockton has been consistently to the northeast and these seven locations are all <br /> downgradient of the site operations. Results of the grab groundwater sampling program <br /> were reported to the RWQCB along with recommendations for follow-up work4. Those <br /> recommendations were: <br /> Install one shallow downgradient monitoring well (MW-6) on South Argonaut <br /> Street, in the vicinity of grab groundwater samples SB-2 and SB-3 and <br /> downgradient of MW-4; <br /> Advance one deep Cone Penetrometer Test (CPT) hole in the northeastern <br /> ' corner of the property, to record deeper subsurface stratigraphy and collect a <br /> sample of deeper groundwater; and <br /> t . Per the 9 July 2003 RWQCB request, investigate upgradient groundwater <br /> quality. The proposed upgradient work included: <br /> ' 0 Identifying the owner of the adjacent property to the west of JTF Stockton <br /> and explore the possibility of gaining access for installing a monitoring <br /> ' well. <br /> ' 39 July 2003. Letter from Amy Terrell to Mr. Eric Jenks. "Review of Work Plan, Draft Monitoring and <br /> Reporting Program,John Taylor Fertilizers, Stockton Facility, San Joaquin County.' <br /> ' 4 GeoSyntec Consultants, 2004. "December 2003 Downgradient Delineation Report, John Taylor <br /> Fertilizers Co., Inc., Stockton, California Facility." 30 March. <br /> • P:\PRJ2003REM\Wilbur-EIGs\WrO250(JTF)\STOCKTON\S IT Oct 2004 Work Plan\Oct 04 Work Planb.doc <br /> w <br /> `, RECYCIFD AND RECYGABLE <br />