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• <br />ATTACHMENT A <br />DRILLING AND SAMPLING PROCEDURES <br />The procedures that will be used for drilling the borings and collecting soil samples are presented <br />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 Public <br />Health Services, Environmental Health Department (SJCEHD). Access agreements from <br />adjacent property owners will be obtained as appropriate. <br />Drilling Procedures <br />• Two additional borings will be advanced to a depth of approximately 30 feet below <br />ground surface (BGS) and approximately 80 feet BGS. Borings will be drilled using <br />hollow stem auger drilling 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 recorded <br />on a boring log under the supervision of a State -registered geologist. <br />Soil Sampling Procedures <br />• Shallow borings will be sampled at 5 feet BGS and then in 5 -foot increments until total <br />depth. The deep boring will be sampled at 5 feet BGS and then in 5 -foot increments until <br />40 -feet where it will be continuously sampled until total depth. <br />• The drilling and sampling equipment will be washed in a detergent rinse, two clear water <br />rinses, and a final deionized/distilled water rinse prior to drilling. The equipment will air <br />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 clear <br />water rinses and a final deionized/distilled water rinse. The sample tubes will be dry <br />before use. <br />• Samplers are to be driven using a 140 -pound hammer dropping approximately 30 inches. <br />The number of blows (blow count) required to advance the sampler 12 inches will be <br />recorded on the boring log. <br />IT CORPORATION <br />SAC:\\\SACRFP 1\COMMON\sacDP\2002\PRJ\PJ8\880\8800391 A.2ac.doc <br />(01040000) <br />A-1 <br />