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ATTACHMENT A DRILLING AND SAMPLING PROCEDURES The procedures that will be used for drilling the borings and collecting soil samples are presented below ' . General safety procedures will be reviewed with the field investigation staff and subcontractors prior to commencement of field activities • Monitoring well installation permits will be obtained from San Joaquin County Public Health Services, Environmental Health Division (SJCPHS/EHD) 1 Encroachment permits will be obtained from the City of Stockton as appropriate Drilling Procedures • Two borings will be advanced to a depth of approximately 30 feet below ground surface (BGS) and one deep boring will be advanced to a depth of approximately 80 feet BGS Borings will be drilled using hollow stem auger or direct-push drilling equipment D Augers and drilling equipment will be washed prior to drilling each boring o Soil descriptions, sample type and depth, and related drilling information will be recorded on a boring log under the supervision of a State-registered geologist Soil Sampling Procedures • Borings will be sampled at 5 feet BGS and then in 5-foot increments until total depth • The drilling and sampling equipment will be washed in a detergent rinse, two clear water rinses, and a final deiomzed/distilled water rinse prior to drilling The equipment will dry air dried or dried using paper towels o Soil samples will be collected in acetate sleeves or in six-inch long, stainless steel or brass sample tubes inserted inside the samplers The sample tubes are to be 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 will be dry before use IT CORPORATION SACIIISACRFPIICOMMON1sacDP120021PRJ\PJ8188018800391A tab doc (01020000) A-1