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Frontier Transportation.. Inc. B23502.01 October 16, 1996 Page A-1 APPENDIX A THE "VINING LABORATORIES, INC. STANDARD OPERATING PROCEDURES This appendix contains the standard operating procedures used by Twining in performing the investigation. Twining observes these procedures in order to obtain consistent, reliable data. A-1 Standard Operating Procedures for Hand Augering and Soil Sampling: Subsurface assessment permits, if required, are filed with the appropriate regulatory agencies prior to conducting field operations. Field activities are performed under the supervision of a California registered geologist or certified professional engineer. Sampling equipment is thoroughly cleaned before, during, and after each use according to Twining's "Standard Operating Procedures for Equipment Decontamination". Generally, hand-aMlered borings are not advanced deeper than 10 to 15 feet. If deeper borings are necessary, they will be drilled using the hollow stem auger, or other appropriate drilling method. Soil samples are collected by grabbing cuttings from the boring, or by driving sample tubes into undisturbed soil at the bottom of the augered hole. Soil descriptions, including consistency, moisture, particle size, and color, and other relevant observations are recorded on soil boring logs if pertinent to the investigation. Soils are classified in general accordance with the Unified Soil Classification System (USCS). The soil borings are abandoned by grouting with a 6-sack cement slurry containing 3 to 5 percent bentonite, or backfilling with clean soil. Abandonment procedures depend upon the boring depth, depth to groundwater, project objectives, and regulatory requirements. Soil cuttings generated during hand augering are either replaced in the borings, or stockpiled, depending upon project requirements. Stockpiled soil is containerized in United States Department of Transportation-approved drums, or placed on and covered with plastic sheeting, and stored on site in an area inaccessible to the general public. Typically, the stockpiled soil is characterized by collecting and analyzing composite samples from the stockpile. Twining can recommend an appropriate method for disposition of stockpiled soil based on the analytical results. Disposal will be the responsibility of the client. A-2 Standard Operating Procedures for Drilling and Soil Sampling: Subsurface assessment and/or well construction permits are filed with the appropriate government agency before conducting field operations. Underground Service Alert is notified at least 48 hours prior to initiation of field activities. Field activities are performed under the direction of a California registered geologist or certified professional engineer.