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G U C' ' Thermo-King Stockton LSI Terracon Project Number: 67047008 rNovember 5, 2004 Ld 2.0 FIELD ACTIVITIES rr L. 2.1 Borings Terracdn's field activities were conducted on October 26, 2004 by Mr. Joe McGee, a Terracon environmental professional. As part of the approved scope of work, one Geoprobe soil boring (B-1) was advanced on the west side (presumed down-gradient direction) of the oil/water separator located in the truck wash rack on the west side of the shop building. Figure 1 presents the general boundaries and topography of the site on portions of the USGS topographic quadrangle .map of Stockton West, California (Appendix A). Figure 2 is a site diagram that indicates the approximate location of the soil boring in relation to the pertinent r structures and general site boundaries (Appendix A). j E: Drilling services were performed by a State of California licensed Well Driller using a truck- mounted Geoprobe direct push drilling rig under the supervision of a Terracon environmental L� professional. The soil samples were collected using four-foot long metal rods lined with acetate sleeves. As the metal rod is advanced into the soil, soil collects within the acetate sleeve. To collect the soil samples, the rods were withdrawn from the boring and desired soil samples were cut from the acetate sleeve for field screening, soil classification, and selection and preservation for laboratory analysis. Drilling and sampling equipment were cleaned using an Alconox® wash and potable water prior to the beginning of the project and before collecting each soil sample. r Soil samples were collected continuously and observed to document soil lithology, color, �— moisture content and sensory evidence of impairment. The soil samples were field-screened using a photoionization detector (PID—Thermo Environmental Instruments Model 580B OVM or r equivalent) to indicate the presence of VOCs. �6 The general soil lithology encountered during sample collection consisted of the following: 6:I Clay- concrete surface to a depth of 16 feet below grade surface (bgs). LI Detailed lithologic descriptions are presented on the soil boring log included in Appendix B. �+ Groundwater was not encountered during the advancement of boring B-1. L.i I L3 CJ, I trJ ;