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- = _'• <br /> 2 SOIL ASSESSMENT <br /> Two soil borings were drilled at the BY Pipelines property to assess the presence of <br /> halogenated volatile organics in the soil. The drilling locations and boring designations <br /> were specified by Mr. Robert Munko of B.P. Research. We assume the boring designations <br /> are related to a previous investigation. The locations of the soil borings are shown on Plate <br /> 2, Boring Location Map. <br /> 2.1 DRILLING AND SAMPLING PROCEDURES <br /> On April 5, 1990, soil borings B-1 and B-4 were drilled at the property to depths of 12 and 3 <br /> feet, respectively. Soil samples were collected at depths of 2, 6.5, and 11.5 feet in B-1 and <br /> at 2.5 feet in B-4. <br /> During the sample collection, an experienced environmental geologist classified the <br /> subsurface soil and logged the boreholes. A copy of the Unified Soil Classification System <br /> used to classify the soil, and a log key are present in Appendix A as Plates A-1 and A-'_. <br /> Descriptions of the soil encountered in each boring and the sampling intervals are <br /> presented on the log of Borings, Plates A-3 and A-4 (Appendix A). <br /> The soil encountered in B-1 consisted of sand and gravel (0 to 2.5 feet), clayey silt (2S to <br /> 8.5 feet) and clay (8.5 to 11.3 feet). Soil samples were generally moist, but ground water <br /> was not encountered. The soil encountered in the boring B-4 consisted primarily of loose <br /> sand and gravel at the surface, silty sand (1 to 1.5 feet), and sand (1.5 to 2.5 feet). <br /> At each boring location, a skid mounted drill rig equipped with 6-inch hollow stem augers <br /> was used to reach the desired sampling depths. Samples were collected by advancing the <br /> boring to a point immediately above the desired sampling depth and then driving a <br /> Modified California Sampler lined with three brass tubes into the undisturbed soil. The <br /> sampler was removed from the bottom of the boring, and the bottom tube was sealed with <br /> Teflon sheets and tight fitting plastic caps, labeled, and placed inside an iced cooler. At the <br /> end of drilling operations, the soil samples were delivered under chain-of-custody to <br /> California Analytical Laboratories/Enseco in West Sacramento. <br /> F4-90-106 2 <br />