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Y <br /> 4� <br /> k <br /> h <br /> ALTON GEOSCIEHCE, INC. <br /> GENERAL FIELD PROCEDURES <br /> Pon <br /> GROUND WATER NONITORI14G 14ELL DEVEL0PMENT AND SAMPLING <br /> �,.�,,.,.� wa,rs�r MonitorILL pevel nament <br /> W New ground water monitoring wells will be initially <br /> developed <br /> to clean the well and to stabilize the sand, gavel, <br /> and <br /> aquifer materials around the perforated section Of the well <br /> Well development will be conducted using one of several <br /> acceptable methodsr such ars bailing, mechanical or air lift <br /> pumping, surging or swabbing. Well development will continue <br /> until the well in thoroughly developed and if possible, <br /> free of sand, silt and turbidity. <br /> The water generated from the development process will be <br /> placed into labeled 55-gallon drums, pending labora':ary <br /> results of the ground water samples, to determine t'.a <br /> appropriate disposal method. Disposal of the water will <br /> conform to applicable hazardous waste requirements. <br /> Pricer to well sampling, the ground water level shall be <br /> measured from the north rim of the top of the PVC well <br /> caging, using an electric water level sensor. The well shall <br /> also be monitored for the presence/absence of floating <br /> product, utilizing a clear bailer. <br /> To ensure that the ground water sample is representative of <br /> the aquifer the well will than be purged of four to ten well <br /> caging volumes, before sample collection. This purging can <br /> be accomplished using a bailer or a pump. During purging, <br /> the sampler will note the following: (1) a dpH, temperatureof he <br /> initial discharge of the ground water, (2) p P <br /> and conductivity readings at 5 ore10 charallon intervals, (3) <br /> volume of water purged, and (4) g <br /> The ground water samples will be collected using a steam <br /> cleaners teflon bailer, and then decanted into the appropriate <br /> laboratory supplied containers. The sampler will wear nitril <br /> gloves at all times during purging and well sampling. To <br /> ensure field QA/4C, trip blanks will accompany each well <br /> sampling kit (provi� ored btothe <br /> samlleocollectionand <br /> forfield <br /> selectedblanks <br /> will be collected p p <br /> wells. <br />