Laserfiche WebLink
4 August 1995 <br /> AGE-NC-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 three probings at the site to determine the extent of the impacted soil. Two <br /> probings will be vertical and one will be advanced at an angle of 25.7 from vertical under 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 all three of the probings at;5-foot intervals, beginning at a depth <br /> of 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 three 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 />