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<br /> (. April 2001
<br /> AGE-NC Project No 96-0232
<br />' Page 6 of 14
<br />' The volume of extracted water between 06 December 2000 and 03 January 2001 was equal to
<br /> 684,501 gallons, which equates to a mass of 5,706,685 pounds Multiplying the average MTBE
<br /> concentration (assumed to be 345 µg/1 based on 06 December 2000 and 03 January 2001 influent
<br />' grab water samples)by the pounds of extracted MTBE-impacted ground water yields approximately
<br /> 197 pounds of MTBE removed from MTBE-impacted ground water between 06 December and 03
<br />' January 2001 (Appendix E) -
<br /> The volume of extracted water between 03 January and 02 February 2001 was equal to 791,065
<br />' gallons,which equates to a mass of 6,595,109 pounds Multiplying the average MTBE concentration
<br /> (assumed to be 195µg/1 based on 03 January and 02 February 2001 influent grab water samples) by
<br /> the pounds of extracted MTBE-unpacted ground water yields approximately 129 pounds of MTBE
<br /> removed from MTBE-impacted ground water between 03 January and 02 February 2001 (Appendix
<br /> E)
<br /> The volume of extracted water between 02 February and 08 March 2001 was equal to 1,005,519
<br /> gallons,which equates to a mass of 8,383,012 pounds Multiplying the average MTBE concentration
<br /> (assumed to be 126µg/1 based on 02 February and 08 March 2001 influent grab water samples) by
<br /> the pounds of extracted MTBE-impacted ground water yields approximately 106 pounds of MTBE
<br /> removed from MTBE-impacted ground water between 02 February and 08 March 2001(Appendix
<br /> E)
<br /> To date, the ground water treatment system has removed a total of approximately 6 64 pounds of
<br /> pp Y
<br /> MTBE from extracted ground water (Table 8) First quarter 2001 mass-volume calculations of
<br /> MTBE-impacted ground water extracted from the ground water pump and treat system are presented
<br /> in Appendix E Plots of cumulative ground water pump and treat mass removal trends and influent
<br /> ground water MTBE concentrations versus time are is Appendix F
<br /> 3.0. QUARTERLY GROUND WATER MONITORING AND SAMPLING EVENT
<br /> On 08 and 09 March 2001, ground water monitoring and sampling were performed on 25 ground
<br /> water monitoring wells (MW-1, MW-2, MW-4, MW-5, MW-6A, MW-6B, MW-7, MW-8A,
<br /> MW-8B, MW-8C, MW-9A, MW-9B, MW-9C, MW-11A, MW-11B, MW-11C, MW-11D,
<br /> MW-12A, MW-12B, MW-12C, MW12D, MW-13A, MW-1313, MW-13C and MW-13D) In
<br /> addition, ground water samples were collected from 8 extraction wells(EW-2,EW-4, EW-5, EW-6,
<br /> EW-7, EW-8, EW-9 and EW-10), two domestic drinking water wells located at 14659 Thornton
<br /> Road (Rocky's Restaurant) and at 14749 Thornton Road (Three B's Truck Plaza) Quarterly ground
<br /> I water monitoring procedures for the site were outlined in the Work Plan Addendum dated 28 January
<br /> 1998 and approved by the PHS-EHD by letter dated 24 February 1998 A coordinated effort was
<br /> made with Three B's Truck Plaza (14749 Thornton Road, Lodi CA) to conduct ground water
<br /> Advanced GeoEnviranmental,Inc
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