ARCHIVED REPORTS_XR0007377 CASE 2

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PHASE 11 ENVIRONMENTAL SOIL SAMPLING AT&T MICROWAVE RELAY FACILITY 90 WEST TURNER ROAD,SACRAMENTO,CALIFORNIA CONFIDENTIAL AND PRIVILEGED III. SOIL BORING INVESTIGATION ' Soil Boring Locations Pnor to drilling, Underground Service Alert (USA) was contacted on August 3, 1999, to identify known utilities that service the Subject Property in order to select soil boring locations This investigation was assigned USA number 546154 A health a safety plan was reviewed and signed by all personnel performing the investigation ' ATC applied for, and received a soil boring permit from the San Joaquin County Public Health Services — Environmental Health Division A copy of this permit is presented in Appendix A The scope of work for the soil sampling investigation included drilling a total of ten soil bonngs using a truck-mounted Geoprobe® Fieldwork was conducted on August 24, 1999 Soil bonngs were drilled in the vicinity of the former ' UST Bonng B1 was terminated at a depth of 26 feet bgs due to refusal in the dense soil Boring B10 was terminated at a depth of 12 feet bgs due to encountenng a concrete obstruction (the UST slab) Borings B2 through B9 were completed to a depth of 32 feet bgs The general locations of the soil borings are listed in Table i below Table 1 - Soil Boring Locations for 90 West Turner Road, Lodi, CA, drilled August 5 and 24, 1999 ' SOIL BORING LOCATION B1 Adjacent to southwest corner of former UST B2 South of former UST B3 South of former UST B4 North of former UST B5 East of former UST ' B6 Southwest of former UST B7 West of former UST B8 East of former UST ' B9 Southeast of former UST B10 East of former UST ' Soil locations are illustrated in the Site Detail Map - Figure 3 Soil boring locations were determined using tape boring g measurements from existing site features ' Soil Sampling ' The soil borings were drilled using truck-mounted direct rod push equipment (Geoprobe(k) The Geoprobe® rods and sampling tube equipment were either steam cleaned or washed with an Alconox and water solution and triple nnsed prior to use to protect against possible cross contamination Soil samples were continuously cored and logged The ' soil samples collected for laboratory analysis were collected at various depths between 4 feet and 32 feet bgs The soil samples collected by the Geoprobeg dnlling equipment were collected using a 2-inch diameter barrel sampler lined with a clear plastic tube Samples were driven into the ground in either 24" Increments or 48"increments depending on ' local soil conditions The sampler containing the plastic liner, with the relatively undisturbed soil sample, was removed ATC selected a segment of the sample to be retained for Iaboratory analysis based on a desired depth and hydrogeologic variations The selected liners were then sealed with Teflon tape, covered with polypropylene end caps, 4