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. f <br /> 24 January 2012 <br /> AGE-NC Project No. 11-2040 <br /> Page 2 of 3 <br /> mg/kg, 5.4 mg/kg and 13 mg/kg. Based on this information the case was closed by the <br /> local regulatory agency. However, this release was never assessed to determine the full <br /> vertical and lateral extent of the impacted soil. <br /> SCOPE OF WORK <br /> AGE proposes to advance a total of six soil borings at the site. Three borings (B1 through <br /> B3)will be advanced near the former UST area, two borings (B4 and B5)will be advanced <br /> in the truck repair area located inside Warehouse 4, and one boring (B6)will be advanced <br /> near the storm drain outside of Warehouse 4. Boring locations may be modified in the field <br /> depending on site conditions. Approximate boring locations are illustrated in Figure 2. <br /> Borings will be advanced to depths of approximately 25 feet below surface grade (bsg) <br /> near the former UST area, and 10 feet bsg in the truck repair and near the storm drain <br /> outside of Warehouse 4. Borings will be advanced using either a GeoProbe® direct-push <br /> or Power Probe drill rig. <br /> Soil samples will be collected from borings B1 through B3 at five-foot intervals, beginning <br /> at 10 feet bsg. Soil samples will be collected from borings B4 through B6 at 1 foot, 5 feet <br /> and 10 feet bsg. Soil samples will be submitted to a California Department of Public Health <br /> (CDPH)-Certified laboratory and analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) total petroleum <br /> hydrocarbons quantified as diesel (TPH-d) and total petroleum hydrocarbons <br /> quantified as motor oil (TPH-mo) in accordance with EPA-method 8015-modified. <br /> • Volatile organic compounds (VOCs) in accordance with EPA-method 8260B. <br /> Upon completion of the field work and receipt of laboratory analysis, a brief report will be <br /> prepared. The report will be reviewed and signed by a California Professional Geologist. <br /> PROBE BORING ADVANCEMENT <br /> Probe borings will be advanced using either a van-mounted Geoprobe®5400 direct-push <br /> probing unit equipped with 1.25-inch probing rods, or a truck-mounted Power Probe unit <br /> equipped with 1 .25-inch probing rods. Both the Geoprobe® 5400 and the Power Probe <br /> units advance soil borings using a hydraulic hammer to drive soil sampling tools to <br /> specified depths. <br /> Advanced CcoEnvironmcntal,Inc. <br />