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' Environmental <br /> Mr Harlin Knoll Resources <br /> 27 April 1998 Management <br />' Page 2 <br /> MW-5 Quarterly September 18, 1997 <br />' MW-1A Quarterly September 18, 1997 <br />' MW-2A Quarterly September 18, 1997 <br /> MW-3A Senu-annually September 19, 1997 <br />' MW-4A Quarterly September 19, 1997 <br />' MW-5A Semi-annually September 18, 1997 <br /> The schedule recycles on a calender yearly basis and all wells will be <br />' sampled in the first quarter 1998 During the fourth quarter 1997 <br /> sampling event, only those wells identified for quarterly sampling were <br /> sampled The field procedures used to collect these samples are <br />' described below, followed by a discussion of the water level <br /> measurements and analytical results <br /> FIELD PROCEDURES/OBSERVATIONS <br /> 1r <br /> Water levels and total depths of each well were measured at <br /> approximately 1115 am on 1 December 1997 These data, calculated <br />' ground water elevations, and purging records are presented in <br /> Attachment A <br />' Prior to sampling, each well identified for sampling, was systematically <br /> purged of three casing volumes using a submersible Grundfos pump <br />' Ground water samples were collected and placed into containers <br /> appropriate for the analysis of interest (Ferrous (Fe+2), pH,Conductivity, <br /> Nitrate, Chloride, Dissolved Methane, Dissolved Carbon Dioxide (CO2), <br />' Benzene, Toluene, Ethylbenzene, and Xylene (BTEX), Trimethylbenzene, <br /> Total Petroleum Hydrocarbons as gasoline (TPH(g)), Total Petroleum <br /> Hydrocarbons as diesel (TPH(d)), Dissolved Manganese (Mn)) The <br />' sample containers were labeled appropriately and maintained in chilled <br /> coolers until they could be transported to the laboratory <br />' As you recall, oxygen-regenerating compound (ORC) socks were <br /> previously installed within eight wells to enhance biodegradation of TPH <br /> 1 0 and associated compounds (BTEX) These ORC socks were removed <br />