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ATTACHMENT B <br /> Drilling and Sampling Procedures <br /> THE PROCEDURES THAT WILL BE USED FOR DRILLING THE BORINGS AND <br /> COLLECTING SOIL SAMPLES ARE PRESENTED BELOW. <br /> • General safety procedures will be reviewed with the field investigation staff and <br /> subcontractors prior to commencement of field activities. <br /> • Monitoring well installation permits will be obtained from San Joaquin County <br /> Environmental Health Division (SJCEHD). <br /> DRILLING PROCEDURES <br /> • Two borings will be advanced to.a depth of up to 25 feet below ground surface <br /> (BGS) and one deep boring will be advanced to a depth of approximately 80 feet <br /> BGS. Borings will be drilled using hollow stem auger equipment. <br /> • Augers and drilling equipment will be washed prior to drilling each boring. <br /> • Soil descriptions, sample type and depth, and related drilling information will be <br /> recorded on a boring log under the supervision of a State-registered geologist. <br /> ,SOIL SAMPLING PROCEDURES <br /> • Borings will be sampled at 5 feet BGS and then in 5-foot increments until total <br /> depth. <br /> • The drilling and sampling equipment will be washed in a detergent rinse, two clear <br /> water rinses, and a final deionized/distilled water rinse prior to drilling. The <br /> equipment will dry air dried or dried using paper towels. <br /> • Soil samples will be collected in six-inch long, stainless steel or brass sample tubes <br /> inserted inside the samplers. The sample tubes are to be either pre-washed by the <br /> supplier or washed using a bristle brush with a detergent rinse followed by two <br /> clear water rinses and a final deionized/distilled water rinse. The sample tubes will <br /> be dry before use. <br /> • Samplers are to be driven using a 140-pound hammer dropping approximately 30 <br /> inches. The number of blows (blow count) required to advance the sampler 12 <br /> inches will be recorded on the boring log. <br /> • Following retrieval of the sampler, the first (lowest) sample tube will be removed <br /> from the sampler, the ends covered with aluminum foil or Teflon film, and capped <br /> with PVC end caps. <br /> N:\sacDP\2001\PRAP18\8800401 A.l ac.doc B-1 <br /> 12/12/01 <br />