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- Chevron/S. £1 Dorado 20 <br /> August 1990 <br /> To investigate the condition of groundwater beneath the <br /> -� site, three groundwater-monitoring wells were installed. <br /> Groundwater was encountered under semi-confined conditions at <br /> approximately 47-feet below grade. Subsequent groundwater <br /> monitoring and wellhead Elevation surveying indicated a <br /> hydrostatic depth-to-water of 40 feet, a groundwater gradient of <br /> 0.02 ft/ft, and a groundwater-flow direction to the northwest. <br /> Analytical results of groundwater samples collected from the <br /> newly installed and developed monitoring wells indicated that the <br /> groundwater has been impacted by gasoline hydrocarbons. <br /> Concentrations of TFH-as-gasoline in the groundwater samples <br /> -� ranged from MDL to 1,500 ppm. Concentrations of benzene ranged <br /> from MAL to 890 ppm. Soil samples collected from the capillary . <br /> fringe in the borings for the monitoring wells (MW-1E, MW-2F, and <br /> MW-3E) did not contain measurable concentrations of gasoline <br /> hydrocarbons. <br /> - CLOSURE <br /> Groundwater Technology, Inc. is pleased to provide Chevron <br /> U.S.A. Inc. with this report. If you have any questions, please <br /> contact .our Concord office. at (415) 671-2387. <br /> 7; <br /> CNOCWu,'ATck <br /> TEa moux 1.is <br />