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' Soil Boring Installation • Page 3 <br /> 8700 Thornton Road.,Stockton <br /> ' GPE Project 639.2 <br /> June 13,2011 <br /> 2.0 SOIL INVESTIGATION <br /> 2.1.1 Preliminary Site Work <br /> Prior to installing the soil borings, the following steps were completed: <br /> • A Work Plan describing the proposed soil borings and laboratory work <br /> ' was prepared and submitted to the San Joaquin County <br /> Environmental Health Department (EHD), along with an application <br /> ' for a drilling permit. The permit was granted and a copy is attached <br /> as Appendix C. <br /> ' • The drilling area was marked with paint and Underground Service <br /> Alert (USA) was contacted to locate any underground utilities that <br /> might be present in the area. No such utilities were identified. <br /> 2.1.2 Soil Boring Installation <br /> V&W Drilling of Stockton, CA (C57-720904) mobilized a Geo-ProbeTM drilling <br /> rig to the site on June 2, 2011 and installed three soil borings (designated as <br /> B-1, B-2, and B-3). One boring was installed through the estimated former <br /> location of each of three tanks. The Geo-Probe uses direct-push methodology <br /> in which the drilling tools are pushed directly into the ground using a <br /> ' hydraulic ram and hammer system. The drilling process involved use of <br /> sections of 1-inch diameter steel tube, which serves as a drill stem. The lead <br /> 4-foot long section has a 1.5-inch inside diameter fitted with a plastic sample <br /> sleeve. The lead rod is withdrawn after each 4-foot section of rod is driven <br /> into the ground. The result is a continuous core sample, which may be <br /> retained for logging and/or sampling. The borings were advanced to a depth <br /> ' adequate to penetrate to the desired depth of 20 to 24 feet, and collect a <br /> suitable soil sample from the bottom of each boring. <br /> ' Upon reaching the total depth of each boring, and collecting sample, the <br /> boring was abandoned by filling to the surface using Class A/B neat cement. <br /> 2.1.3 Soil Sampling <br /> During drilling, a log was made of each boring. Samples were described at 4- <br /> foot intervals. Information noted includes such data as sample depths, <br /> horizons of detectable contamination (detected by field methods), soil <br /> classification utilizing the Unified Soil Classification System and sediment <br /> description (color, texture, composition, hardness, moisture content, and post- <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, Ca 95356 Fax: (209)569-0295 <br />