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Environmental <br /> Mr Harlin Knoll Resources <br /> Page 3 27 April 1998 Management <br /> P <br /> from each well on 28 November 1997, and water levels were allowed to <br /> recover prior to measuring water levels or collecting samples At the <br /> completion of the December 1997 monitoring event, new ORC sock <br /> strings were constructed and placed into the wells' <br /> GROUND WATER FLOW PATTERNS <br /> Ground water elevation data for the December 1997 monitoring event <br />' are presented in Attachment A and contoured on Figure 2 As observed <br /> on this figure, the ground water flow direction is generally to the south, <br /> with a slight mounding 1n the immediate vicinity of Former Tank #2 <br />' The ground water flow direction observed during this event is consistent <br /> with that of previous sampling events <br />' ANALYTICAL RESULTS <br /> MSamples were collected from the six wells on the quarterly monitoring <br /> schedule (MW-1, MW-4, MW-5, MW-1A, MW-2A, and MW-4A) to <br />' evaluate the effectiveness of the ORC process These samples were <br /> analyzed for the following <br />' * TPH(g) by USEPA Method 8015 modified, <br /> * TPH(d) by USEPA Method 8015 modified, <br />' * BTEX compounds by USEPA method 8260, <br />' * General water quality parameters', <br /> * 1,2,4-Trimethylbenzene, and <br /> 1 <br /> I Based on field observahons which indicate that the ORC socks are spent after approximately six <br />' months,ERM has replaced the ORC sock strings biannually since their use was implemented <br /> ' These water quality parameter(hereinafter,"general water quality parameters")include nitrate, <br />' chloride,pH,conductivity,manganese,carbon dioxide,methane,ferrous iron,and ferric iron <br />