Laserfiche WebLink
4.0 MONITORING WELL DEVELOPMENT/PCJRGING AND SAMPLING <br /> Following installation, the wells were surged with a surge block to remove fines from the sand pack After surging, <br /> Ond water is purged from each well using a bailer to remove sediment and insure representative sample quality. <br /> Ground water was purged from the well using a bailer Subsequent to the initial well development and sampling event, <br /> monitoring wells were purged of six well casing volumes of ground water prior to collecting a sample. Measurements <br /> of pH,temperature, and conductivity were recorded during the purging process to insure stabilization of these parameters <br /> After the water levels within the wells were allowed to stabilize, a sample was collected with a dedicated, clean, <br /> disposable plastic bailer. Samples were sealed in au-tight vials and packed on ice and transported to a California-certified <br /> laboratory to be analyzed within the EPA-specified holding tame for requested analyses. <br /> Each sample container submitted for analysis had a label affixed to identify the job number, sample date, time of sample <br /> collection, and a sample number unique to that sample. Samples were analyzed by a Califorma-certified laboratory <br /> A chain-of-custody form was used to record possession of the sample from tune of collection to its arrival at the <br /> laboratory When the samples were shipped, the person in custody of them relinquished the samples by signing the <br /> chain-of-custody form and noting the time. The sample control officer at the laboratory verified sample integrity and <br /> rmed that it was collected in the proper container, preserved correctly, and that there was an adequate volume for <br /> wsis. <br /> 5.0 SURVEYING <br /> The top of each new well riser was surveyed on May 21, 1992, to allow correlation of the ground water levels at the site. <br /> The surveyed point on each well riser was marked to insure all future ground water level measurements are taken from <br /> the same location All elevations were surveyed relative to a bench mark established by a topographic map of <br /> General Mills facilities (BM elevation at 44 5 feet) <br /> w� <br /> • <br /> LRP135 HMB <br />