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1 <br /> PHASE II ENVIRONMENTAL SOIL SAMPLING <br /> AT&T MICROWAVE RELAY FACILITY <br /> 90 WEST TURNER ROAD,SACRAMENTO,CALIFORNIA <br /> CONFIDENTIAL AND PRIVILEGED <br /> Scope of Sod Boring Invesagation <br /> ' The scope of services performed by ATC as part of the soil boringinvestigation included the following <br /> g g <br /> • Contacted Underground Service Alert(USA) to have utility owners locate known subsurface utilities at the <br /> site <br /> ' • Drilled ten soil borings to depths of 12 to 32 feet bgs by method of GeoprobeO direct push technology <br /> • CoIIected soil samples from each boring at approximately 4-foot intervals <br /> • Collected groundwater grab samples from eight of the ten soil borings through the installation of <br /> temporary wells <br /> ' • Submrted selected soil and groundwater samples to a State-certified analytical laboratory for analyses for <br /> total petroleum hydrocarbons — diesel fuel (TPH-D, EPA Method 8015M), benzene, toluene, ethylbenzene <br />' and total xyelenes (BTEX, EPA Method 8020), and methyl Cert-butyl ether (MTBE, EPA Method 8020) <br /> • Performed necessary QA/QC checks to validate the analytical data <br />' a Prepared this report summarizing the observed site conditions and data obtained from the soil boring <br /> investigation, including conclusions and recommendations regarding the need for further monitoring and/or <br /> remediation <br /> The soil boring investigation has been performed in conformance with the soil boring investigation workplan that was <br />' submitted to AT&T on July 22, 1999 Field work was conducted in conformance with the site specific Health and <br /> Safety Plan (HASP) prepared in conformance with the Occupational safety and Health Administration (OSHA) <br /> requirements [29 CFR 1910 1200)] <br /> II. GEOLOGICALIHYDROGEOLOGICAL DATA <br /> ATC reviewed pertinent, available documents and maps regarding local geology, hydrogeology, and physiography in <br />' order to evaluate the potential migration of hazardous substances at or around the Subject Property <br /> Geology and Physiography <br />' The Subject Property is located in San Joaquin County, and is situated in Section 4, Township 3 North, Range 6 East <br /> of the Mount Diablo Baseline and Meridian as shown on the Lodi North Quadrangle United States Geological Survey <br /> 7 5 Minute Series map (1968, photorevised 1976) The elevation of the Subject Property is shown as approximately <br /> 38 feet above mean sea level (MSL) <br /> 1 The Project Site is located in the City of Lodi in the Sacramento Valley The City of Lodi is situated on alluvial <br /> deposits that have accumulated in the Central Valley Basin over the last 100 million years The materials have been <br /> derived from surrounding uplands, transported by major streams, and deposited in successive clay, silt, sand, and <br /> gravel layers on the river floodplams, in the local sinks, or within the shallow sea that periodically covered the valley <br /> 2 <br />