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02 June 2006 <br /> AGE-NC Project No. 06-1434 <br /> Page 2 of 4 <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). Based on data available from nearby monitoring wells,as well as AGE's <br /> experience regarding investigation of adjacent properties, the depth to ground water at the site is <br /> approximately 40 to 45 feet below surface grade (bsg). <br /> 4.0. SCOPE OF WORK <br /> AGE proposes to collect soil samples to determine if petroleum hydrocarbon-impacted soil and is <br /> present beneath the site. The limited subsurface investigation will include the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil sample collection and analysis; and <br /> • Report preparation <br /> The preliminary site assessment tasks are discussed below. <br /> 4.1. 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 /> 4.2. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> AGE proposes to advance five soil borings at the site. Each boring shall be advanced to a depth of <br /> approximately 20 feet bsg. Soil samples will be collected at five-foot intervals. The proposed probe <br /> boring locations may be modified due to field observations. <br /> The proposed probe boring locations are illustrated on Figure 2.Field procedures for advancement <br /> of probe borings and collection of soil samples are presented in Sections 5.1 and 5.2. <br /> Selected soil samples from each probe boring will be submitted for laboratory analysis.The selected <br /> samples will be analyzed by a State of California Department of Health Services (DHS)-certified <br /> Advanced GeoEnvironmental,Inc. <br />