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Asite-specific health and safety plan (Shaw, 2003b) was prepared in accordance with 29 Code of <br /> Federal Regulations 1910.120. The health and safe ly plan included safety procedures for work <br /> performed at the site, chemical hazard information site safety officers, and preferred medical <br /> emergency locations. <br /> 2.3 Field Investigation <br /> 2.3.1 Utility Survey <br /> ' Underground utility location surveys were conducted to assess the absence or presence of <br /> unreported underground utilities at the site, to clear utilities for the trench and boring locations. <br /> The surveys were performed on May 20, 2002 and February 11, 2003. The second survey was <br /> required after revisions were made to the boring loc ions in the final workplan. <br /> ' The survey used ground-penetrating radar (GPR) and radio frequency survey equipment. The <br /> approach for the utility survey was to initially conduct a GPR survey to locally investigate <br /> suspect magnetic anomalies. Based on the GPR survey results, electromagnetic radio frequency <br /> pipe locating equipment was used to investigate possible underground utilities. <br /> 4 . <br /> 2.3.2 Trenching <br /> Trenching was conducted on February 18, 2003 to evaluate the presence of the leach system. <br /> Backhoe services were provided by RAH Environmental, Inc. of Loomis, California. The <br /> trenching was conducted under the observation of a. Shaw geologist. Ms. Margaret,U&ial of <br /> t _ the SJCEHD was also present to observe the trenching. Two trenches were excavated. One <br /> trench extended from east to west, perpendicular to he locations of the leachfield lines, and one <br /> trench was excavated at the leachfield line corner ne borehole B-2 (Figure 2). The depth of the <br /> trenches was approximately 1.2 meters (d feet) at the western end. <br /> A soil sample was obtained from native soil beneath each of the three westernmost leach lines. <br /> The samples were collected by packing soil in a metal sample tube and labeled Pipe 1, Pipe 2, <br /> and Pipe 3. Samples cduld not be collected from native soil beneath the eastern leach lines due <br /> to lower sidewall saturation by water from the base of the trench, and collapse of the overlying <br /> .r <br /> pea-gravel cuts. <br /> ¢ At the direction of Mr. Saiyed Ali, the excavation was Lbackfiiled with the ekcavated"aoil and <br /> . . compacted. <br /> 1.� <br /> N:IsacDP120031Pr1183W35444.3ac.doc 2-2 <br />