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, x; <br /> EXHIBIT A <br /> DESCRIPTION OF FIELD METHODS <br /> Measurements of the static water level were taken in each well Prior to commencing purging,and <br /> a check for floating product was also made at that time. <br /> wells were purged using a dia hragm pump (supplied by <br /> Prior to sampling, the monito Th wells were purged of a minim m of three well <br /> volumes, if <br /> Armour Petroleum Services). <br /> in the <br /> possible,or until they went dry. A well volume is defined as the amount M asurementsrof PH, <br /> well casing and in the filter pack,at an assumed porosity of 35 percent. Pular intervals during <br /> specific conductance,and temperature of the groundwater were taken at bailer <br /> each well was sampled With a disposable bailer equipped with a <br /> Pumping. After purging, throw h the bottom valve into two 40- <br /> bottom•empt•-ring valve. The sample was drained directly g <br /> milliliter glass vials with Teflon-lined septa. <br /> was removed from the sit? by Armour <br /> All groundwater produced during the sampling activity <br /> ( Petroleum Services. <br /> 7 <br /> ,f <br />