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ALTON GEOSCIENCE <br /> GENERAL FIELD PROCEDURES <br /> FOR <br /> GROUND WATER MONITORING AND SAMPLING <br /> Ground water monitoring and sampling was performed in accordance with the guidelines <br /> of the San Joaquin County Public Health Services (SJCPHS) and Regional Water Quality <br /> Control Board, San Francisco Bay Region (RWQCB). Prior to purging and sampling each <br /> well, total well depth and depth to ground water was measured with an accuracy of 0.01 foot <br /> from a reference mark at the top of each well casing using an electronic sounder. <br /> Prior to sample collection, each well was purged of the required well casing volumes or until <br /> stabilization of pH, temperature, and conductivity was achieved. Purging was accomplished <br /> using either a clean bailer or pump. <br /> Ground water samples were collected using a disposable bailer, then carefully transferred <br /> into clean, laboratory-supplied glass containers. The sampler wore nitrile gloves at all times <br /> during purging and well sampling. The samples were clearly labeled with well number, site <br /> identification, date and time of collection, and sampler's initials, and transported to a <br /> California-certified laboratory following proper preservation and chain of custody protocol. <br /> Ground water generated during purging was placed into labeled 55-gallon drums approved <br /> by the Department of Transportation pending laboratory results of samples to determine the <br /> appropriate disposal method. <br />