SITE INFORMATION AND CORRESPONDENCE

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1.0 INTRODUCTION On behalf of Mr. Arnold Hof,property owner,this report has been prepared by JD Smith Consulting QDS) to summarize the results of groundwater monitoring performed on 13 October 2011 at the former Cal Farm Supply Company (Cal Farm) facility located at 2040 West Washington Street, Stockton, San Joaquin County, California (Figure 1). Work at the site has been conducted in response to the Monitoring and Reporting Program(MRP)R5-20040805 dated August 19, 2004, and subsequent directives dated June 7,2011 (Appendix A)from the Regional Water Quality Control Board(RWQCB), Central Valley Region. This report includes the following: • A description of the background and project status in Section 2.0, • A description of groundwater sampling and analytical procedures in Section 3.0, • A summary of groundwater monitoring data, including a discussion of groundwater monitoring trends in Section 4.0, and • Recommendations in Section 5.0 2.0 BACKGROUND AND PROJECT STATUS The site is located near the Port of Stockton and consists of a warehouse and fenced sales yard surrounded by open field located to the south and east. The site is bordered on the west by railroad tracks and a former PureGro Ag-chem facility(now Cargill). To the north,across West Washington Street, is a Duraflame company warehouse and open field. To the south beyond the field is a facility known as the Koppel Stockton Terminal,and like the Cargill facility, has been remediated for nitrate groundwater impacts. The former Cal Farm warehouse and sales yard were used for the temporary storage, sale, and distribution of pesticides, fertilizers, and agricultural equipment. The warehouse and yard have not been used for these purposes since 1985. One 1,000 gallon underground storage tank (UST) containing diesel was removed in 1990. The Cal Farm Supply Company filed for bankruptcy in 1987. Historic investigation work at the Cal Farm site indicated groundwater impact by nitrate, pesticides, and petroleum hydrocarbons. Previous investigations were conducted at the site by Kennedy/Jenks/Chilton consultants between 1989 and 1995,and by IT Corporation(IT)from 1995 to 2000. A detailed summary of the project history was provided in IT's Remedial Investigation Report submitted to the RWQCB on February 4, 1998 (IT, 1998). The RWQCB requested that further assessments be conducted at the site in May 1995. A work plan for environmental corrective action was submitted to the RWQCB by IT on February 28, 1997. The work plan included performance of a Geoprobe survey,installation ofgroundwater monitoring wells,and performance of aquifer testing for a remedial options feasibility study. The final work plan was approved by the RWQCB on March 14, 1997 (IT, 1997a). The Geoprobe survey was initiated in April 1997 and results were provided to the RWQCB in a Phase I Site Investigation Report dated September 19, 1997(IT, 1997b). Based on the results of the Geoprobe survey,additional monitoring wells were installed at the site in November 1997(Phase In. A Monitoring and Reporting Program (MRP) 97-812 was issued for the site by the RWQCB on November 12, 1997. Cd&._Agtrll 1D Smi�CoreWWig IY//7011