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Clayton DRILLING, WELL CONSTRUCTION, AND SAMPLING PROTOCOLS FOR BOREHOLEMONTTORING WELL INSTALLATION BDREHQI R INSTAL J ATION Clayton Environmental Consultants, Inc. acquires the proper governmental agency permits to bore, drill, or destroy all proposed boreholes and monitonng wells that intersect with " groundwater aquifers and writes a health and safety plan. Clayton subcontracts only with drillers who possess a current C-57 water well contractor's - license issued by the State of California and whose personnel have attended the OSHA 40- hour Hazardous Materials Safety Training Prior to starting works, a "tailgate" safety meeting including discussion of the safety hazards and precautions relevant to the particular lob will be held with all personnel working on the lob Well drillers are identified on permit applications. Boreholes are dniled dry by hollow- or solid-stem, continuous flight augers. Augers, drill rods, and other working components of the drilling ng are steam-cleaned before arriving onsite to prevent the introduction of contaminants. These components are also steam- cleaned between borings away from boring locations. Cleaned augers, rods, and other -- components are stored, and/or covered when not in use. Clayton examines the soil brought to the surface by drilling operations, and samples ..: undisturbed soil every 5 feet or as otherwise specified Borehole logs are filled out in the } field by a geologist who is trained and working under the supervision of an engineer or geologist who is registered in the State of California Our borehole logs include a detailed description of subsurface stratigraphy using the Unified Soil Classification System. Soil cuttings are screened for hydrocarbon contamination using an organic vapor meter (OVM). Clayton uses two different organic vapor testing field testing methods One is the open-air method and the other is an ambient temperature headspace method. When we use the open-air method, we monitor the ambient air above a target area without collecting a physical sample. This method measures the hydrocarbon vapors as they exist in the particular environment at that specific point in time This method is affected by existing weather conditions, particularly wind and temperature. Using this method, we can monitor the environment for worker safety as well as locate pockets of the more volatile hydrocarbons that may not be visible _. 1 J