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(2) sample number and depth; (3) date and time of collection; (4) collector <br /> $ name; (5) site name; and (6) site location. The samples will be stored on ice <br /> iin the field and transported to the analytical laboratory in an ice chest cooled <br /> with blue ice. Chain-of-custody records (shown on Plate 8) will be maintained <br /> and delivered with the samples to the analytical laboratory. Samples will be <br /> submitted to Anatec Laboratories , Inc. of Santa Rosa, California for oil and <br /> grease analysis. <br /> F ' <br /> After sampling, the probe holes will be backfilled with a bentonite/cement <br /> grout. The location of the sump will be marked and later surveyed in by <br /> measurement to landmarks appearing on Chevron's maps for this area. <br /> Observation Well <br /> The observation well will be installed in order to evaluate whether free oil <br /> is present on the water table and to provide a groundwater sampling point. This <br /> well will serve to indicate whether hydrocarbons are moving from the old sump <br /> t� <br /> into the groundwater system. <br /> z The well boring will be advanced using 12-inch hollow stem auger drilling <br /> equipment operated by Anderson Geotechnical of Roseville , CA. Drilling opera- <br /> tions will be supervised by an experienced Dames 6 Moore geologist/field manager <br /> who will assist in obtaining relatively undisturbed samples of the subsurface <br /> materials, maintain a continuous log of the boring, and make detailed obser- <br /> vations of the site conditions. <br /> [ Soil samples will be collected to evaluate site stratigraphy. Samples will- <br /> be collected using the Dames b Moore Type U-Sampler (Plate 9). Continuous <br /> samples will be collected from the surface to a depth approximately 1 foot below <br /> the level of the bottom of the sump. Beneath the level of the sump, samples <br /> will be collected at five-foot intervals. Borings will be advanced until soil <br /> that is not visually contaminated by hydrocarbons is encountered. <br /> €� Samples of fill from elevations above or at the level of the sump will be <br /> collected using a sampler lined with new 1-inch long 2.5-inch diameter brass <br /> These samples will be retained, but not submitted for chemical analysis. <br /> rings. <br /> a' <br /> In order to assess potential downward migration of the material in the sump, <br /> JED2/H -6- <br />