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loose and unconsolidated. There were occassional small lenses <br /> consisting of sandy clay, and the sands contained abundant heavy <br /> minerals and mica. No distinct bedding was observed, which is <br /> typical of alluvial flood plain deposits. There was no evidence <br /> of discoloration or contamination, and no f 3 product, color, or <br /> odor was detected during -the• opz: aticin. The soil was very <br /> slightly damp during excavation, but girrickly dried upon exposure <br /> to air. An irregular lense of grayiuh-white arkosic sand was <br /> encountered near the bottom of the excavation, which contained <br /> abundant gold-colored mica. It had no odor, and dried <br /> f immediately after removal. <br /> Excavation continued under the direction of Wm. Hunter, <br /> } registered geologist, and C,regory Lyons, EHS, from the San <br /> Joaquin Co. Environmental Health Division. The hole was <br /> deepened and widened to approximately. 22' lona X 12' wide X 13' <br /> deep (Plate X; ) a total of about 102 cubic yards of soil was <br /> removed, and stored an plastic as indicated an Plate V. No water <br /> was encnuntered, and no odor or discoloration was observed. <br /> Under the direction of Mr. Lyons, soil samples were taken from <br /> the sidewalls and bottom of the hole as shown an Plate X. In <br /> addition, 3 composite samples were taken from the removed soil; <br /> one from the previous excavation, and two from the current work. <br /> All samples ware properly sealed, labeled and stored on ice, and <br /> transported to Canonie Environmental under proper chain of <br /> custody, (refer to Exhibit D) The removed soil was stored on and ; . <br /> l cova;,ed with plastic as shown an Plate V. <br /> Latoratory analyses were performed on August 9 & 10, and showed � <br /> that leve.'s of tasted substances in samples from the excavation <br /> were below detection limits; (refer to Table II. ) The three <br /> samples from the stored soil indicated low levels of Toluene; i <br /> other tested substances were below detection limits; (Table III.) <br /> SUMMARY: <br /> 1. Laboratory analysis from this tank--pull samples measured <br /> t detectable amounts of Xylene and Total Volatile Hydrocarbons; <br /> (Table 1.) <br /> i <br /> 2. Laboratory analysis of samples taken after re-excavation <br /> shoNed that all measured substances were below detection limits; <br /> (Tab Iv--I1. ) _..._.._ -- - _..._ -------- ------ <br /> �a _... - - . -- ---- --- - - -- <br /> 3. Laboratory analysis of the remrkvd spoil showed that Toluene <br /> was present in very minor amounts; no other substances were <br /> hated. (Table 1I1) <br /> CONCLUSION: <br /> t 1,^ Based upon the i-asults of the geological investigation, and <br /> supported by the. laboratory analyses, all contamination has been <br /> 3 <br /> r <br /> 1 <br />