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f <br /> .I <br /> 4.0 MONITORING WELL DEVELOPMENT/PURGING AND SAMPLING <br /> Following installation, the wells. were surged with a surge block to remove fines from the sand pack. After <br /> surging,ground water is purged from each well using a bailer to lremove sediment and insure representative sample <br /> quality. p <br /> Ground water was purged from the well using a bailer. Subsequent to the initial well development and sampling r <br /> event, monitoring wells were purged of six well casing volumes of ground water prior to collecting a sample. <br /> Measurements of pH, temperature, and conductivity were recorded during the purging process to insure <br /> stabilization of these parameters. After the water levels within the wells were allowed to stabilize, a sample was <br /> collected with a dedicated, clean, disposable plastic bailer. Samples were sealed in air-tight vials and packed on <br /> i <br /> k <br /> ice and transported to a California-certified laboratory to be analyzed within the EPA-specified holding time for <br /> requested analyses. <br /> Y <br />' i lir <br /> I <br /> Each sample container submitted for analysis had a label affixed]to identify the job number, sampleI` date, time of <br /> •� 1 <br /> sample collection, and a sample number unique to that sample. 'Samples were analyzed b a California-certified <br /> ` y y G <br /> laboratory. <br /> A chain-of-custody form was used to record possession ofthe sample from time of collection to its arrival at the <br /> E <br /> laboratory. When the samples were shipped, the person in custody of them relinquished the samples by signing <br /> IE` <br /> the chain-of-custody form and noting the time. The sample control officer at the laboratory verified sample <br /> integrity and confirmed that it was collected in the proper container, preserved correctly, and that there was an <br /> adequate volume for analysis. <br />' r <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 <br /> .r • <br /> the site. The surveyed point on each well riser was marked to insure all future ground water level measurements <br /> are taken from the same location. All elevations were surveyed relative to a bench mark established by a <br /> topographic map of General Mills facilities (BM elevation at 44.5 feet). k <br />�3 <br /> ii <br /> LRPOSITA <br /> ' i <br />