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WORKPLAN FOR SOIL SAMPLING AT CORDES FARM 24915 HANSEN ROAD TRACY, CALIFORNIA I. INTRODUCTION This workplan describes the proposed soil sampling to be completed at the Cordes Farm located at 24915 Hansen Road, Tracy, California. The purpose of this investigation is to assess if previous and current uses of hazardous materials at has impacted the shallow soils of the subject property. Thirteen soil borings, eight soil samples and two sediment samples are planned for this investigation. In general, the sampling areas are located in the main farm compound by above ground fuel tanks, hazardous materials storage areas, underground septic tanks and at random areas across the farm fields for potential pesticide contamination. Select soil samples will be analyzed by State Certified Laboratory for petroleum hydrocarbons, volatile organic compounds including chlorinated solvents, metals and pesticides. The on-site groundwater production well will also be sampled for this investigation for general minerals. The utility clearances is scheduled to be completed on November 15, 1999. The soil sampling is scheduled for November 22, 1999. A soil sampling report will be submitted to San Joaquin County Environmental Health Division (SJCEHD)upon completion of investigative activities. Included in this workplan are: 1) site setting, 2) the scope of the proposed work, 3) descriptions of field procedures, sampling protocols, and analytical methods, and 4) project staff and schedule. Maps showing the site location and the locations of the proposed sampling points are presented in Figures 1 and 2. Also included are example boring logs and laboratory and chain-of-custody laboratory form(Appendix A) and a site specific health and safety plan (Appendix B). A. Background Information The rectangular, 1,228 acre property has been farmed by the Cordes Family since Mr. George Cordes homesteaded the land in 1869. It includes the main farm compound with two family residences and several barns, 100 head of cattle, several horses, and approximately 1,200 acres of predominantly oats under cultivation. Improvements to the subject property include the main farm compound located near the center of the property along the westside of Hansen Road. The main compound contains the original farm house which has been vacant for approximately 20 years, a modern single-family residence constructed in 1975, a new mobile home, a large sheet metal storage barn constructed in 1973, an older smaller sheet metal barn, a sheet metal Quonset but with fencing materials, a wooden former shop, a wooden 4H storage barn, a large wooden hay barn, a wooden cattle barn, an old abandoned 1