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ka u y Wright Environmental Services, Inc. EXPLORATORY DRILLING, SOIL SAMPLING, WELL CONSTRUCTION AND WELL SAMPLING PROTOCOLS Exploratory Boring Drilling and Sealing Exploratory boring, soil sampling, well construction, and borehole sealing procedures follow current guidance recommended by the USEPA, California Regional Water Quality Control Board, and modified as required by local city, health agency or water district agencies Drilling is performed under approved permits and boreholes are sealed upon completion Soil/Sediment Drilling Sampling Procedures I_ Drive (or hydraulically push) soil sampling will commence at a depth of 5 feet below surface grade The samples will be taken at 5-foot increments and at intervals of geologic interest or obvious or suspected contamination to the total borehole depth Additional sampling and/or continuous coring may be done at the discretion of the supervising geologist All logging will be done using the Unified Soil Classification System, together with pertinent geologic observations (bedding, fractures, fossils, mineralogy etc ) as appropriate for the site geology delineation Continuous core (when collected) will be placed in core boxes for storage at the Client designated area The core will be collected in a coring barrel, tube or other coring technology as used on the working drill rig if small diameter (less that 2-inches) hydraulic push sampling method is used, the drilling contractor will provide an extruder to push the core out of the tube for logging Other discrete portions of core may be retained in sampling tubes depending upon the required testing for the project 2. All soil sampling tools (split spoons, cores, etc ) will be disassembled, steam- cleaned or cleaned in soapy (TSP) water, rinsed with clean tap water and finally rinsed with or distilled water, and air-dried prior to taking each sample. The cleaned tools will then be reassembled with similarly cleaned, dry brass sample liners and carefully lowered into the hollow stem augers for the collection of the next sample The drill rig will arrive on-site clean, be decontaminated as needed during work at the discretion of the logging geologist and prior to leaving the site 3. When sampling exploratory trenches, stockpile soils or during soil excavation, the soil sample will be collected by the following procedure, a clean brass liner will be pushed into the stockpile or excavation sidewall, or soil in the excavator bucket About two inches of soil will be brushed away whereupon the liner will be pushed into the soil The liner is then removed, sealed, labeled and logged onto chain-of- custody forms and packed in a chilled ice chest W ES Sampling Protocols last rev 5/96 Page 1