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Work Plan—PEA Page 4 Former Haley Flying Service GPE Project 474.2 pesticides are reported in the first row of boring samples, analytical testing will be requested for some, or all, of the other borings. At a minimum samples from borings B-9 to B-11 will be tested. Depending on laboratory results, additional soil borings may be needed at other locations to fully define the lateral extent of groundwater contamination. Such additional borings would require another mobilization. 2.3 Groundwater Monitoring Wells Upon completion of the Geo-Probe borings and evaluation of the laboratory results, in a second mobilization, a suite of at least three borings will be advanced with hollow-stem auger drilling equipment owned and operated by RSI Drilling, Inc. of Woodland, CA, a C-57 licensed drilling contractor (C-57 No. 802334). The location will be at points around the contaminated area of the Haley Property, and as shown in the site map. Depending on how far to the north the contamination is found in the Geo-Probe soil borings, a fourth monitoring well may also be located on the parcel north of the irrigation ditch(see Figure 2). The hollow stem auger drilling rig will be used to advance 8-inch diameter soil borings (designated MW-1, through MW-3 or MW-4) to a total depth of about 18 feet, the approximated depth of a previously identified silt and clay layer. During drilling, soil samples will be collected at 5-foot intervals, and the borings will be logged as previously described for the Geo-Probe borings. Upon completion, each of the hollow stem auger borings will be converted to a groundwater monitoring well. Soil cuttings will be placed in drums, labeled as investigative derived waste (see Figure 3 for example of label information) and temporarily stored, pending profiling and determination of proper disposal methods. 2.4 Geo-Probe Boring Sampling and Analysis Prior to installing the proposed soil borings, the required drilling permit will be obtained from the San Joaquin County Environmental Health Department. The Geo-Probe soil borings will be drilled using 2-inch outside diameter Geo-Probe drilling equipment owned and operated by RSI Drilling of Woodland, CA, a C-57 Licensed drilling contractor (C-57 No. 802334). The borings will be advanced to a depth sufficient to penetrate the groundwater surface (est. about 11 feet below grade). The domestic water well and previously installed borings B-3 through B-8 are shown on the detailed site sketch map (Figure 2). See the original Work Plan and the first Addendum for information regarding soil boring, groundwater sampling, and soil sampling procedures. After collecting the final soil sample and groundwater sample, each boring will be filled to grade with Class G neat cement. A total of three 1-liter amber glass bottles will be used to store each groundwater sample. Upon retrieval, each groundwater sample will be transported to Severn Trent Laboratories of Pleasanton, CA, a California certified analytical laboratory, for analytical testing. One bottle will be selected for analytical testing for organo-chlorine pesticides by EPA method 808113, while the remainder of the sample materials will be retained for possible additional analysis 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, Ca 95356 Fax: (209)569-0295