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Appendix E SOIL BORING PROGRAM ' Golden Grain Company 299 Moffat Boulevard Manteca,California ' In November 1995, Fluor Daniel GTI,on behalf of Golden Grain Company,prepared a Work Plan for Implementation of a Soil Boring Program The purpose of the soil boring program was to evaluate the ' overall effectiveness of the remediation system,define the extent of impacted groundwater,determine the concentrations of soil and groundwater contamination,if any,that exist under the former warehouse, and to collect soil samples for further definition of the aquifer characteristics The work plan was submitted to ' Golden Grain on November 16, 1995 The work plan was subsequently submitted to the San Joaquin County Environmental Health Department(SJCEHD) and approved with modifications On January 25, 1996, Fluor Daniel GTI submitted an addendum to the work plan addressing the requested modifications ' The field work outlined in the work plan and addendum was completed in April 1996 The following describes the methodology,work performed,and results of the soil boring program ' METHODOLOGY Site-Spec>fc Health and Safety Plan. The Site-Specific Health and Safety Plan was amended and ' updated to address the proposed work scope All Fluor Daniel GTI personnel and subcontractors were required to review and sign the Health and Safety Plan prior to performing any work at the site Permitting. Permit applications were submitted to and permits obtained from the SJCEHD for the soil borings and temporary monitoring points ' Subsurface Assessment-Soil. In April 1996,ten soil borings were advanced at the site using GeoProbe direct push technology The sod bonngs were continuously logged at each coring location, using the Unified Soil Classification System, by a Fluor Daniel GTI field geologist working under the supervision of a ' California registered geologist During the soil conng and sampling procedures, all equipment was decontaminated to avoid any potential cross contamination ' The continuous cores were screened for hydrocarbon vapors using a photo-ionization detector(PID) Screening was conducted by field headspace analysis on selected sections of sal cores A soil sample was placed in a zip-lock bag fora minimum of five minutes before the PID probe was inserted and the ' reading recorded Soil bonngs C1 through C7 were advanced and samples collected to determine if the soil vapor extraction ' system (SUES) had been effective in remediating subsurface vadose zone soil Soil samples were also collected from bonngs C2,C6,and C8 for aquifer parameter testing In addition, boring C6 was advanced to 36 feet below grade to determine the vertical extent of impacted soil adjacent to the former tank pit area ' Soil boring locations are shown in Figure 3 ' Soil samples were collected for laboratory analysis from the cares based on Irthologic changes, proximity to the water table,field screening results, and depth below the water table The samples were placed in brass tubes,the ends of the brass tubes were sealed with Teflon sheets, capped with plastic caps,taped, labeled, ' and placed on ice in an insulated container chilled to 4°C The samples were maintained and transported FLUOR DANIEL G!1 4 ' .wap -