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15 October 2009 <br /> AGE-NC Project No. 98-0452 <br /> Page 2 of 3 <br /> under ground storage tank(UST)as part of the LUST investigation.Well MW-4 was installed within <br /> the water table to a depth of 25 feet below surface grade(bsg)with a screened interval between 5 feet <br /> and 25 feet bsg. <br /> Extracted ground water was stored in a 20,000-gallon Baker Tank(Figure 3) located immediately <br /> west of well MW-4.A submersible pump was installed in the tank on 01 September 2009 to circulate <br /> extracted ground water to prevent the tank drain from clogging with sediment and as a form of <br /> mosquito control. The submersible pump was programmed to operate for one hour and to cycle off <br /> for one hour. At the time of this letter, ground water is currently stored in the on-site Baker Tank, <br /> with continued operation of the submersible pump within the tank. <br /> DISCHARGE OF GROUND WATER TO SURFACE <br /> The anticipated use of the stored ground water will be for dust control. As part of daily activities of <br /> the Yamada Brothers'Farm,the dusting of gravel/dirt access roads occurs utilizing a water truck and <br /> ground water extracted from irrigation wells.In efforts to the use the stored ground water,especially <br /> during a drought year, the Yamada Brothers' Farm would like to utilize the ground water stored in <br /> the Baker Tank for dusting of gravel/dirt access roads in lieu of pumping additional water from <br /> existing agricultural wells. Access roads to be dusted are shown on Figure 2. <br /> The Yamada Brothers propose to use a water truck with an approximate capacity of 1,500 gallons, <br /> to spread the stored ground water on gravel access roads during a period of approximately 1 week <br /> (typical use for the farm during the harvest season). The water truck utilizes sprayers at the rear of <br /> the tank; sprayers are manually adjustable to varying spray patterns and volume of water released. <br /> The sprayers will be adjusted to release the ground water in a fan pattern to insure coverage of the <br /> gravel/dirt access roads while keeping the volume of water released at a level to prevent water <br /> ran-off. <br /> CHARACTERIZATION OF STORED GROUND WATER <br /> Prior to initiating the ground water batch removal from well MW-4,the well was sampled utilizing <br /> a disposable polyethylene bailer.Total petroleum hydrocarbons quantified as gasoline(TPH-g)were <br /> reported at a concentration of 2,200 micrograms per liter(µg/1),methyl-tert-butyl ether(MTBE)was <br /> reported at a concentration of 7.4 µg/l, ethylbenzene was reported at a concentration of 17 µg11 and <br /> total xylenes were reported at a concentration of 24.8µg/l.Total petroleum hydrocarbons quantified <br /> as diesel (TPH-d) were not reported at or above detection limits. <br /> After 24 hours and after approximately 1 week of pumping, ground water samples were collected <br /> Advanced GeoEnvironmentaf,Inc <br />