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FIELD PRACTICES AND PROCEDURES <br /> General procedures used by-Stratus in site assessments for drilling:exploratory borings, <br /> collecting samples; and 'installing monitoring wells are described herein. These.general <br /> procedures .are used to- provide consistent and reproducible results; however, ,some <br /> procedure may be :modified based on site conditions. A California state-registered <br /> geologist.supervises the following..procedures. <br /> PRE-FIELD WORK ACTIVITIES <br /> Health and Safety Plan <br /> Field work performed-by Stratus:at the site is conducted.according to guidelines established <br /> in a Site Health and Safety Plan (SHSP). The SHSP is a documentwhich describes the <br /> hazards that- may be encountered in the field and specifies`;protective equipment, work <br /> procedures, and emergency information. A copy of the SHSP'is� at the site,and.available <br /> for reference by appropriate,parties during work at the,:site . <br /> Locating Underground Utilities <br /> Prior to commencement of any work`:that is to.be below^surface grade, the location of the <br /> excavation, boring, etc.; is marked.with white paint as required:by law.:An underground <br /> locating service such as .Underground Service Alert (USA) is contacted. The locating <br /> company contacts the owners of the various utilities in the vicinity of the site to mark the <br /> locations of their underground utilities. Any invasive work is preceded by hand augering to <br /> a minimum depth of five feet below' surface grade'to avoid contact with_.underground <br /> utilities: <br /> FIELD METHODS AND PROCEDURES <br /> Exploratory Soil Borings <br /> Soil borings will be drilled using a truck-mounted; hollow stem auger drill rig. Soil <br /> samples for logging will be obtained from 'auger-return materials. and by advancing a <br /> modified California split-spoon sampler equipped with.brass or stainless steel liners into <br /> undisturbed soil beyond the' tip of. the auger.: Soils.-will be logged by a geologist <br /> according to the Unified Soil Classification System and°standard geological techniques. <br /> Drill cuttings well be"screened using a portable photoionization.detector (PID) or a flame . <br /> ionization detector °(FID). Exploratory .soil borings :not used .for monitoring well <br /> installation will be backfilled to the surface with a bentonite-cement:slurry pumped into <br /> the boring through a tremie' pipe: <br /> Soil sampling equipment'will be cleaned with a detergent water solution, rinsed with <br /> clean water, and equipped with-clean` liners between.sampling intervals_. Augers and <br /> MAField PracticesTield Practices and Procedures-revised 07-2004.d6c <br />