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30 March 2004 ! <br /> S AGE-NC Project No 02-0962 <br />' Page 2 of 7 <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 20 to 25 <br />' feet below surface grade(bsg)based on information from quarterly monitoring events performed by, <br /> AGE at the adjacent Nomellim Construction Company, the ground water elevation is estimated at <br /> approximately 15 to 20 feet MSL and ground water flow generally toward the north to northeast <br />' However, this may be greatly modified by local recharge and discharge patterns <br />' 22 FUEL-DISPENSING SYSTEM UPGRADE <br /> In February 2003, as part of a fuel-dispensing system upgrade, the UST sumps, fuel dispensers and <br />' associated piping were excavated by the Fillner Construction Company, excavated soil was <br /> stockpiled on site for evaluation prior to transport to Forward Landfill for disposal During the <br />' excavation, soil samples were collected by an AGE representative from the floor of the piping <br /> excavation, the fuel dispenser excavation and soil stockpiles for analysis The laboratory analysis <br /> detected total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d), <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX), and the fuel additive methyl tert butyl ether <br />' (MTBE)from the areas of the former piping and'fuel dispensers Analytical results are summarized <br /> in Table 1, Figure 2 depicts the approximate location of the sample collection points <br /> 3.0. PROCEDURES <br /> The field work reported herein was performed in accordance with procedures outlined in the AGE- <br /> prepared Preliminary Site Assessment Work Plan, dated 09 September 2003, and approved by the y ' <br />' EHD by letter dated 26 September 2003 - <br />' 31 DRILLING <br /> On 30 and 31 October 2003, seven soil probe borings (B1 though 137) were advanced at the site <br /> utilizing a van-mounted Geoprobe 5400 direct-push probing unit equipped with 1 125-inch probing <br /> rods All borings except B3 were advanced to a depth of 30 feet below surface grade (bsg), B3 <br /> encountered refusal at 16 feet bsg Soil-boring locations are depicted in Figure 2 <br /> Advanced GeoEnvironmental,Inc <br /> l <br />