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Wright Environmental Services, Inc. EXPLORATORY DRILLING, SOIL AMPG PROTO WELL CONSTRUCTION AND WELL 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 1. 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 don budonet t the discretion eaeson of the supervising geologist. All logging il Classification System, together geologic (bedding,ding, fractures, fossils, mineralogy as appropriate for site geology delineao 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 he working drill rig. if small diameter (less that provide i a hydraulic push sampling method is used, the drilling contract er discrete portior will ns of core extruder to push the core out of the tube for logo g. may be retained in sampling tubes depending upon the required testing for the proj ect. 2. All sail sampling tools ( TSP}spoon s, cored etc.) t will be disassembled, steam- cleaned or cleaned in soapy { each sample. The cleaned lly rinsed with or distilled water, and air-dried prior to taking 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 ork e. The drill rig will arrive on-site clean, be decontaminated as needed during w 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 soilwill bis hene removed, sealed, labeled and logged liner will be pushed into the soil. The liner logged onto chain-of- custody hain o-custody forms and packed in a chilled ice chest. WES Sampling Protocols -last rev. 5/96 Page ].