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� I <br /> GEOMATRIX <br /> t • May 1993 aerial photograph—The current Bellini property appears to have been <br /> 1 cleared of shrubs. The rectangular patches of crops, scattered debris, and small <br /> aboveground structures located within the current Arcos property appear to have <br /> been removed. <br /> 3.2.2 Geophysical Investigation <br /> A geophysical investigation was conducted at the Arcos property in September 2003 by <br /> } NORCAL Geophysical Consultants, Inc. (NORCAL), of Petaluma, California. The objective <br /> of the geophysical investigation was to locate pertinent underground features that may be <br /> associated with the OVP or other pump station operations. NORCAL's report is included in <br /> Appendix E and summarized in this section. <br /> NORCAL used three geophysical methods for this investigation: electromagnetic terrain <br /> 'l conductivity(TC), electromagnetic line locating(EMLL), and electromagnetic metal detection <br /> (MD). TC data were collected at 5-foot intervals along east-west traverses spaced 10 feet apart. <br /> 7 The EMLL and MD instrumentation were operated on a 50-foot by 50-foot grid and a 10-foot <br /> by 10-foot grid, respectively, with fill-in traverses as needed. <br /> JMore than 40 potential utility segments and several areas of buried metal were located across <br /> the Arcos property. The utilities detected,mostly undifferentiatedfunidentified,range from <br /> r more than 100 feet to less than 15 feet long. Increased density of utilities was detected in the <br /> vicinity of the former pump house,boiler house, and heater house. A utility trending north- <br /> south located immediately west of the former pump house matches the location of the lines <br /> shown on the historical site map (Appendix D). Results of the geophysical investigation are <br /> lshown on Figure 2. <br /> 1 3.2.3 Evaluation of Current Property Conditions <br /> West Yost&Associates, Inc., of Davis,California, completed an aerial and land survey of the <br /> site in September 2003. The survey included coordinates for the soil borings advanced as part <br /> of the Bellini property investigation, the monitoring wells at the Bellini property, property <br /> boundaries,Highway 33, Welty Road, and the railroad right-of-way. The survey map and <br /> aerial photograph are shown on Figure 2. <br /> A Geomatrix geologist completed a site reconnaissance at the Arcos property in August and <br /> October 2003. The reconnaissance included walking the extent of the property,recording site <br /> conditions, and interviewing current property tenants. During the site reconnaissance, several <br /> llarge debris piles,uneven ground, and high vegetation were observed along the northeast <br /> ( 1APR0JE=G00s\50n.000\5011-03.doc 13 <br /> _1 <br />