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i <br />' 2.2.7 Well Evacuation: Prior to evacuating water from th~ well, the <br />volume of water in each well will be calculated. Ground water from <br />all wells will be evacuated either by using a bailer or a <br />' submersible pump before any sampling takes place. In no case will <br />a well be sampled unless all water standing in the well casing has <br />been replacl~i by fresh ground water from the aquifer. A minimum of <br />' three (3)~volumes of water will be evacuated from each well. In no <br />case will sampling take place more than two hours aftek~ the third <br />' volume has been removed from the well. During this procedure, ~~ <br />bailers will be lowered gently into the wells to minimize agitation ~r~' <br />' of the ground water. ~` , <br />~' i <br />' Wells with very low recovery rates will be pumped or bailed to ~~ <br />dryness and allowed to recover prior to sampling. if this happens, , <br />it will be noted on the Field Data Collection Sheep that the ~~ <br />' evacuation of a minimum three casing volumes criterion was not met ~t <br />for this well. If possible, sampling should take plats within 24 VV~~V,,~~~,,~ <br />' hours after well evacuation. x~~''") p ( , <br />M <br />' 2.2.8 Ground Water Samplinp~ ethod; Samples will be obtaineQ after the <br />procedures described in Sections 2.2.1, 2.2.6 and 2.2.7 are <br />' completed. Samples will be taken using a bailer or a submersible <br />pump. Bailers and pumps will be cleaned in accordance with <br />cleaning procedures outlined in Section 2.2.1. Care will be taken <br />to prevent bailers, pumps or appurtenant apparatus from coming into <br />contact with any contaminated surface. <br />' Ground water samples will be poured from the bailers or pump <br />' discharge directly into a bucket until sufficient quantity has been <br />collected. This composite sample will then be poured direectly into <br />bottles previously prepared and supplied by the laboratory. <br />Pouring will be accomplished in a manner that will minimize <br />agitation of samples. <br />-14- <br /> <br />