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15 November 1995 <br /> AGE-NC Project_No. 95-0162 <br /> Page 2 of 3 <br /> 2.3. GROUND WATER DEPTH AND GRADIENT <br /> According to information obtained, ground water depth in the vicinity of the site is reported to be in <br /> excess of 80 feet. The San Joaquin County Flood Control and Water Conservation District Map Lines <br /> of Equal Depth to Water in Wells, Fall of 1993, does not indicate a ground water depth in the area <br /> of the site. <br /> 3.0. SCOPE OF WORK <br /> Further investigation is necessary to determine the extent of the hydrocarbon impacted soil. AGE <br /> proposes to install four probings at the site to determine the extent of the impacted soil. Three <br /> probings will be established vertical and one will be advanced at an angle of 25° from vertical under <br /> the building. <br /> Probings will be advanced using, a Geoprobe, to vertical depths of approximately 40 feet. If field <br /> observations indicate the presence of hydrocarbon impacted soil at 40 feet, the probings will be will <br /> be advanced to greater depths. <br /> Soil samples will be collected from each of the probings at 5400t intervals, beginning at a depth of <br /> 10 feet bsg. These samples will be field screened for organic vapors. Selected soil samples will be <br /> analyzed by a State-certified laboratory. <br /> 4.0. PROCEDURES <br /> 4.1. COLLECTION OF SOIL SAMPLES <br /> For the collection of soil samples, the following procedures will be performed: <br /> 1. Notify the San Joaquin County Environmental Public Health-Environmental Health Division <br /> (PHS-EHD) 48 Hours prior to the commencement of any work. <br /> 2. Install,four probings, using a van-mounted, 1.125-inch diameter probe rods to depths of <br /> approximately 40 feet. The borings locations are depicted of Figure 2. <br /> 3. Decontaminate sampling equipment in an alconox solution and rinse twice with water prior <br /> to each sampling run. <br /> 4. Obtain discrete soil samples at five-foot intervals, starting at 10 feet, using a Geoprobe soil <br /> sampler assembly loaded with pre-cleaned 1.125-inch by 6-inch brass sleeves. <br /> 5., Preserve soil samples in the lead brass sleeve by covering both ends with Teflon or aluminum <br />