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GROUND WATER MONITORING WORK P• <br /> DREDGE MATERIAL DISPOSAL SITE 1,ROBERTS ISLAND,PORT OF STOCKTON <br /> 3. The selected soil sample intervals will be cut to length, capped at both ends, labeled, and <br /> placed in a chest containing ice pending transport to the laboratory under standard chain-of- <br /> custody procedures. The label will identify the top of the sample interval and will include <br /> boring number, sample depth, date and time of sample collection, and sampler's initials. A <br /> field log will be recorded in the field for each boring and will include geologic descriptions and <br /> symbols, depth to water, sample intervals, and date and time of sample collection. <br /> Table 1: Geologic Sample Intervals <br /> GEOLOGIC SAMPLE INTERVAL RATIONALE <br /> MATERIAL <br /> Dredge Top and bottom 6 inches;and 6 inches of Characterize unsaturated and saturated <br /> materials dredge materials immediate above the <br /> zones. <br /> zone of saturation. <br /> Immediately underlying the dredge Characterize attenuation capacity of the <br /> materials-top and bottom 6 inches. foundation soil. <br /> Foundation <br /> Or, if dredge materials are not present, <br /> soil Characterize quality of soil near but not <br /> the top, middle,and bottom 6 inches of directly affected by dredge sediments. <br /> surface soil. <br /> Characterize attenuation capacity of the <br /> Peat Layer Top and bottom 6 inches. <br /> peat. <br /> Sandy Characterize geologic materials <br /> q <br /> a uifer Top 6 inches. comprising the shallow aquifer. <br /> 3.1.2.5 Water Sampling within Geologic Media <br /> Grab samples of water will be collected from dredge sediments, peat layer, and the underlying <br /> sandy shallow aquifer (Table 2). Upon reaching the desired depth in the boring within each <br /> water-bearing unit, 5 feet of slotted PVC screen will be lowered into the boring to serve as <br /> temporary well casing. <br /> Ground water grab samples will be collected within the PVC screen using either a bailer <br /> constructed of Teflon, PVC, or stainless steel, or a peristaltic pump outfitted with PVC or Teflon <br /> tubing. <br /> January 2005 Page 11 Environmental Risk Services,Corp. <br />