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CLEARWATER GROUP Soil Borehole Drilling, Monitoring Well Installation and Development, and Groundwater Sampling Field Procedures Drilling and Soil Sampling Len its Site Safe la tilt Clearance Clearwater Group obtains all the required permits,unless otherwise contractually directed Clearwater prepares a site specific Site Safety Plan 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 Clearwater, attempts to ction (in ction with locate all able site mnagersnd b f available), and ove ground review of site ases by site ebuilt dr wings nClearwater itssubcontractors employ atprivate, knowledgeable site managers,, professional utility locator to refine the site utility inspection prilitng_Equipmenj All soil borings are drilled using a truck-mounted hollow-stem auger drill rig, unless site conditions warrant a different drilling method Subsurface conditions permitting, the first five feet of each boring is advanced using a hand-auger or post-hole digger All drilling equipment is inspected daily and manitamed in safe working condition by the operator All down-hole drilling equipment is steam cleaned prior to arriving on site Working components are y steam cleaned between ring to atiohe nril rig near the borehole,as All CLEARWATER drilling las and sampl grs and me hods are consistent lw h ASTM Method D-1452-80,and locat • local,state and federal regulations Soil SamIm and Ltholo is Desert ti n ring to be drilled at a site is continuously cored to obtain a complete Whenever possible, the first Clearwater bo hthologic description Otherwise, soil samples are typically collected every 5 feet to the total depth explored, using ampler if copper or zoic contamination is the subject of the brass tubes fitted m a California-modified split spoon s investigation, stainless steel liners are used instead of brass Additional soil samples may be collected based upon significant changes iii 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 are leaned Field tap water prior to oring Log The soil each sampling events Newrlainers aresusedcwhe everth an s oil sample solution retained for with tap wast 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 approxunately 30 grams of soil in a sealed plastic bag or a glass far sealed with aluminum foil The bag or far is left undisturbed for approximately 15 minutes, in the sun if possible The head space in the bag is accessed in a manner to minimize calibrated organic entry of field are noted tested with thfor e litho ogic danic escriptions onsaon the Fiend Exploratoryrmeter (OVM)Soil Boring Log results of the g On encountering an impenneabie (clayey) layer three feet or more in thickness below a saturated permeable layer where the impermeable layer is considered to be a possible confining layer for an underlying aquifer, drilling is halted until a decision to proceed is obtained from the project manager This process minimizes the chance of introducing contamination to an underlying,clean aquifer . Soil Waste ment Soil cuttingss are are stockpiled on and covered with plastic sheeting to control runoff, or contained in 55-gallon D O T-approved drums on site Waste soil is sampled to chemically profile it for disposable, and hauled by a licensed waste hauler to an appropriate landfill All waste stored on site is properly labeled at the time of production i reg iced June 29 2001