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Attachment B Drilling and Sampling Procedures The procedures that were used for drilling the borings and collecting soil samples are presented below • General safety procedures were reviewed with the field investigation staff and subcontractors prior to commencement of field activities • Monitoring well installation permits were obtained from San Joaquin County Environmental Health Department (SJCEHD) Drilling Procedures • Two borings were advanced to a depth of 25 feet below ground surface (BGS) and one deep boring was advanced to a depth of approximately 55 feet BGS Borings were drilled using hollow stem auger equipment • Augers and drilling equipment were washed prior to drilling each boring • Soil descriptions, sample type and depth, and related drilling information were recorded on a boring log under the supervision of a State-registered geologist Soil Sampling Procedures C Borings were sampled at 5 feet BGS and then in 5-foot increments until total depth • The drilling and sampling equipment was washed in a detergent rinse, two clear water rinses, and a final de>onizedldistilled water rinse prior to drilling The equipment was air-dried or dried using paper towels • Soil samples were collected in six-inch long, stainless steel or brass sample tubes inserted inside the samplers The sample tubes were either pre-washed by the supplier or washed using a bristle brush with a detergent rinse followed by two clear water rinses and a final deionized/distilled water rinse The sample tubes were dry before use • Samplers were driven using a 140-pound hammer dropping approximately 30 inches The number of blows (blow count) required to advance the sampler 12 inches was recorded on the boring log I • Following retrieval of the sampler, the first (lowest) sample tube was removed from the sampler, the ends covered with Teflon film, and capped with PVC end caps 1 Nlrancfp1TrojectsTrojects18801040UxWI!01Assessmentand Interim Remedial Report doc s� B-1