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Report on Soil and Ground-Water Evaluation September 11, 1989 <br /> Proposed ARCO Station, Woodbridge, California AGS 39044-1 . <br /> produced relatively low readings (0.5 to 7.8 ppm). The OVM readings.obtained are on the <br /> Logs of Borings. <br /> Samples selected for possible chemical analysis were- removed from the sampler and <br /> promptly sealed in their brass sleeves with aluminum foil, plastic caps, and tape. They were <br /> then labeled and placed in iced storage for transport to the analytical laboratory. °Chain <br /> of Custody Records were initiated by the field geologist and accompanied the samples to <br /> it the laboratory. Copies of those records are included in the Appendix to this report. <br /> The sediments encountered during drilling were classified according to the Unified Soil <br /> Classification System (Plate P-5). Descriptions of the earth materials encountered in each <br /> boring are in the Logs of Borings (Plates P-6 through P-12). Silt and sand were the <br /> primary soil types encountered during drilling. - <br /> Monitoring Well Construction - <br /> Borings B-1, B-2, and B-3 were reamed with 12-inch-diameter augers and monitoring wells <br /> MW-1, MW-2, and MW-3 were constructed in the borings: The wells were constructed with <br /> thread jointed, 4-inch-inner-diameter, Schedule 40 polyvinyl chloride (PVC) casing. No <br /> chemical cements, glues, or solvents were used in well construction.- The screened portion <br /> 13 <br /> Applied GeoSYSMI s <br />