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25 May 2004 <br /> AGE-NC Project.No. 04-1180 <br /> Page 2 of 5 <br /> The Great Valley has been filled with sediments derived from both marine and continental sources. <br /> Thickness of the sedimentary fill, ranges from thin veneers along the valley edges to more than <br /> 20,000 feet in the south central portion of the valley. The sedimentary formations range in age from <br /> Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits <br /> being primarily continental. Continental-derived sediments were primarily deposited in lac ustrine, <br /> fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the <br /> valley(Olmsted and Davis, 1961);the site itself is located on unconsolidated and semi-consolidated <br /> alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and <br /> Geology, 1977).Rocks composing the basement complex of the Province have not been completely <br /> defined but are believed to be metamorphic and igneous in origin. <br /> The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin(Basin 5-22).The estimated depth to ground water at the site is approximately 30 to 40 <br /> feet below surface grade based on information from surrounding sites monitored by AGE.However, <br /> this may be greatly modified by local recharge and discharge patterns. <br /> 3.0. SCOPE OF WORK <br /> AGE proposes to collect soil samples.to determine if petroleum hydrocarbon impacted soil and/or <br /> ground water is present beneath the site. The limited subsurface investigation will include the <br /> following tasks: <br /> • Permitting and pre-field work activities; <br /> Soil and ground water sample collection and analysis;' <br /> • Report preparation <br /> The preliminary site assessment tasks are discussed below. <br /> 3.1. PRE-FIELD WORK TASKS <br /> A health and safety plan will,be prepared in accordance with Occupational Safety and Health <br /> Guidance Manual for Hazardous Waste Site Activities (National Institute.for Occupational Safety <br /> and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). <br /> Prior to mobilization,the area of excavation will be clearly marked and a utility clearance obtained <br /> through Underground Service Alert. <br /> Advanced GeoEnviron mental,Inc. <br />