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Site Background Information: Herman and Helens Marina <br /> Page 12 of 13 <br /> • MTBE-free fuels have been utilized at the site for the last few years. <br /> Contaminants that have migrated to the flat land,where hydraulic gradients are low, would <br /> tend to be trapped there, mainly in the peat zone, where porosities are very high, but <br /> average permeabilities are very low. Subsequent modifications to the levee and parking lot <br /> in 1997, which included removal of a portion of the petroleum-impacted uppermost peat <br /> from a portion of the east side of the levee for a retaining wall, may account for less- <br /> impacted soil recovered in soil borings B5, B16 and MW-4; according to Mr. Smith, a strong <br /> odor was detected in soil removed during site modification, and several barrels of possibly <br /> contaminated soil are still stored at the site. <br /> On-site extraction well EW-1 was pumped utilizing a pneumatic pump during the third <br /> quarter 2005, at a flow rate of approximately 1 gallon per minute (GPM); the extracted <br /> ground water was routed through a ground water treatment system consisting of three <br /> 2,000 pound granular activated carbon (GAC) and one 3,800 pound Sunsolve®vessels. <br /> Following treatment, water was discharged aboveground via 2-inch diameter PVC piping <br /> to the agriculture drainage ditch; the discharge pipe was positioned to discharge into the <br /> center of the agriculture drainage ditch approximately 55 feet east of the pump-and-treat <br /> system. <br /> ABOVE GROUND TANK SYSTEM FUEL THEFT, SPILL AND INITIAL CLEANUP <br /> ACTIVITY <br /> On 22 September 2007, AGE inspected well MW-2 due to record levels of contaminant <br /> concentrations reported in the analytical results from the quarterly ground water monitoring <br /> on 07 September 2007. Approximately three inches of gasoline free product was <br /> encountered; approximately two gallons of water were removed from well MW-2. AGE <br /> noted southeast corner section of AGT enclosure fencing had been cut and removed and <br /> privacy slats moved. A further inspection noted discolored grass and strong fuel odor at <br /> several surface locations between the damaged fence and well MW-2. The on-site interim <br /> remediation system was placed off-line to reduce the possibility of drawing potential freshly <br /> contaminated ground water away from the source area. Proper notifications were made to <br /> the National Response Center(NRC), including the U.S. Coast Guard(USCG), CVRWQCB <br /> and county agencies. <br /> On 23 September 2007, inspected well MW-2 and encountered approximately two and <br /> one-half inches of gasoline free product; approximately two gallons ofwaterwere removed <br /> from well MW-2. <br /> On 26 September 2007, excavated the discolored grass/odorous soil area associated with <br /> the AGT theft and spill incident using a backhoe. The excavated area was determined in <br /> Advanced GeoEnvironmental,Inc. <br />