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CLE ARWATER G R O U P I , C Errvlro) rrrnrnf Sarr;,es CLEARWATER FIELD PROCEDURES Soil Borehole Drilling, Monitoring Well Installation and Development, and Groundwater Sampling Drilling and Soil Sampling Permits Site Safety Pian Ublrtv Clearance Clearwater Group, Inc (CGI) obtains all the required permits, unless otherwise contractually directed CGI prepares a site specific Site Safety Pian detailing site hazards, site safety and control, decontamination procedures, and emergency response procedures to be employed throughout the defined phase of work At least 48 hours prior to drilling, Underground Service Alert (USA) or an equivalent agency is notified of the planned work CGI, attempts to locate all underground and above ground utilities by site inspection (in conjunction with its' subcontractors and knowledgeable site managers, if available), and review of site as-built drawings CGI may employ a private, professional utility locator to refine the site utility inspection Drilling E ua anent All soil borings are drilled using a truck-mounted hollow-stem auger drill rag, unless site conditions warrant a different drilling method Subsurface conditions permitting, the first five feet of each boring is advanced using ahand-auger or post-hole digger All drilling equipment is inspected daily and maintained in safe working condition by the operator All dawn-hole drilling equipment is steam cleaned prior to arriving on site Working components of the drill rig near the borehole, as well as augers and drill rods are thoroughly steam cleaned between each boring location All CGI drilling and sampling methods are consistent with ASTM Method D-1452-80, and local, state and federal regulations Soil Sampling and Litholo is Description Whenever possible, the first Clearwater boring to be drilled at a site is continuously cored to obtain a complete lithologic description Otherwise, soil samples are typically collected every 5 feet to the total depth explored, using brass tubes fitted in a California-modified split spoon sampler If copper or zinc contamination is the subject of the investigation, stainless steel liners are used instead of brass Additional soil samples may be collected based upon significant changes in hthology or in areas of obvious soil contamination During soil sample collection, the split spoon sampler is driven 18 to 24 inches past the lead auger by a 140-pound hammer falling a minimum of 30 inches The number of blows necessary to drive the sampler and the amount of soil recovered is recorded on the Field Exploratory Soil Boring Log The soil sampler and liners are cleaned with an Alconox® solution and rinsed with tap water prior to each sampling event New liners are used whenever a soil sample may be retained for laboratory analysis Soil samples selected for laboratory analysis are sealed on both ends with teflon tape and Plastic end caps The samples are labeled, documented on a chain-of-custody form and placed in a cooler for transport to a state certified analytical laboratory Soil contained in remaining liners is removed for lithologic descriptions (according to the Unified Soil Classification System) Additional soil is screened for organic vapors by placing approximately 30 grams of soil in a sealed plastic bag or a glass lar sealed with aluminum foil The bag or lar is left undisturbed for approximately 15 minutes, in the sun if possible The head space in the bag is CLEARWATER GROUP, INC 1 August 26, 1996