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I � � �i City of Stockton I� TL# 394--0192-01 September 16, 1994 Page 9 i APPENDIX A STANDARD OPERATING PROCEDURES The standard operating procedures for drilling and soil sampling, installation of monitoring wells, monitoring well development, j groundwater sampling, decontamination, hydrologic data collection and evaluation, sample handling and chain-of! custody, laboratory quality assurance/quality control, and disposal of rinsate and soil cuttings, are described in this appendix. IlThefollowing procedures are supervised under the direction of a California registered geologist. 1 A-1 Drilling and soil Sampling: Subsurface assessment permits will be filed with the San Joaquin County' Public Health Services � Environmental Health Division (SJCEHD) before conducting field operations. Underground Service Alert wi131 be,,il:notified at least 48 hours prior to initiation of field activi;ties;. The soil borings will be drilled using a Central Mine Equipment Company 75 truck-mounted drill rig equipped with 7-5/8-inch outside diameter, continuous-flight, hollow-stem' augers. Twining is a licensed drilling contractor underi� C'`-57 classification (Contractor's License No. 506159) . The soil borings will be drilled under the direction of a Twihing: geologist. Soils encountered during drilling will be logged !�consistent with the Unified Soil Classification System. The soil boring logs will note soil types encountered at depth including consistency, soil moisture, particle size, color, and other ladist,inguishing features. Soil samples will be retained using a 1-1/2-inch inside diameter split-spoon sampler. The sampler will be lined with three six-inch long stainless steel or brass sleeves fori containment of the soil samples. Samples will be obtained by attaching the sampler to the drive rod, followed by driving the sampler into undisturbed soil below the lead auger with a 140--pound hammer '}that is continuously dropped 30 inches until the sampler penetrates 18-inches of soil. The number of drops will be recorded for each six-inch increment the sampler is driven into the soil and recorded on the field log of soil borings. The values for the bottom two six-inch increments will be added together to obtain a standard penetration resistance value for each sample. �f once the soil sample is brought to the surface, the bottom sleeve will be capped with TeflonO tape, fitted with plastic caps, placed in a zip-lock plastic bag, and placed in a cooled ice chest for subsequent transport to Twining's laboratory. This sleeve will either be retained for laboratory analysis or, stored temporarily. Soil retained in the two uppermost sleeves and the shoe of the sampler will be transferred into a plasticibag; agitated to enhance i E I k