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APPENDIX A FIELD PRACTICES AND PROCEDURES General procedures used by Delta in site assessments for drilling exploratory borings, collecting samples, and installing monitoring wells are described herein These general procedures are used to provide consistent and reproducible results, however, some procedure may be modified based on site conditions A California state-registered geologist supervises the following procedures PRE-FIELD WORK ACTIVITIES Health and Safety Plan Field work performed by Delta at the site is conducted according to guidelines established in a Site Health and Safety Plan (SHSP) The SHSP is a document which describes the hazards that may be encountered in the field and specifies protective equipment, work procedures, and emergency information A copy of the SHSP is at the site and available for reference by appropriate parties during work at the site Locating Underground Utilities Prior to commencement of any work that is to be below surface grade, the location of the excavation, boring, etc , is marked with white paint as required by law An underground locating service such as Underground Service Alert (USA) is contacted The locating company contacts the owners of the various utilities in the vicinity of the site to mark the locations of their underground utilities Any invasive work is preceded by hand augering to a minimum depth of five feet below surface grade to avoid contact with underground utilities FIELD METHODS AND PROCEDURES Exploratory Soil Borings Soil borings will be drilled using a truck-mounted, hollow stem auger drill ng Soil samples for logging will be obtained from auger-return materials and by advancing a modified California split-spoon sampler equipped with brass or stainless steel liners into undisturbed soil beyond the tip of the auger Soils will be logged by a geologist according to the Unified Soil Classification System and standard geological techniques Drill cuttings well be screened using a portable photoiomzation detector (PID) or a flame ionization detector (FID) Exploratory soil borings not used for monitoring well installation will be backfilled to the surface with a bentomte-cement slurry pumped into the boring through a tremze pipe . Soil sampling equipment will be cleaned with a detergent water solution, rinsed with clean water, and equipped with clean liners between sampling intervals Augers and I