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Mr. Ross Atkinson March 30, 2001 Page 4 approved County permits are obtained,the proposed sampling locations will be delineated by staking or marking each location. The actual sample locations may be adjusted or omitted in the field to account for subsurface obstructions and/or utilities. Because direct push drilling methods are proposed at both facilities, hand auger drilling methods will be used to clear for buried utilities in the upper 5 feet of each sampling location. Because these facilities are active plants, a geophysical survey will be conducted to minimize the potential to encounter underground utilities and/or subsurface obstructions at each proposed sampling location. In conjunction with the geophysical clearance,Underground Service Alert (USA) will be notified 48 hours prior to implementing intrusive work on site,and a USA dig alert number will be obtained. Based on the layout of surrounding structures and utilities, the(results of the geophysical survey, and the results of the USA notification,the final sampling locations will be selected and clearly marked. Groundwater Sample Collection. Ptior to the onset of drilling activities, the surface area around each probe location will be cleared of surface covering and debris (dirt, concrete, asphalt, etc.). The probe locations will be placed as close as practically possible to the stockpiles without impacts to safety. The sampling locations are shown in Figures 2 and 3. Each probe hole will be advanced to first groundwater using either a tract- wounted or truck-mounted direct push drill rig (depending on availability). One groundwater grab sample will be collected from each probe hole location using a direct push method. ltn general, the sampling method entails advancing a nominal diameter stainless steel sampling rod through the subsurface. A nominal diameter stainless steel sample barrel lined with stainless steel, acetate,or clear inert PVC will be attached to the tip of the sampling rod. At the first direct push bonog location at each facility, the sampling unit will be advanced through the subsurface, and a soil samples will be collected at 2 to 4 foot intervals until first groundwater is encountered. The initial boring will be used to determine the depth to first groundwater at each facility. At subsequent probe locations, soil samples will be collected at discrete depth intervals for lithologic logging. The sample baxxel will be decontaminated between sample intervals. Once groundwater is encountered (anticipated depth is less than 15 feet bgs),the sampling rod with an attached groundwater sample collection device will be advanced approximately 2 to 3 feet into groundwater or to Refusal,which ever occurs first. Alternative drilling methods may be utilized if direct push refusal is met prior to reaching the desired groundwater sampling depth. if Refusal occur.an alternative drilling method may be selected and will require remobilization. A groundwater grab sample will be collected from the sampling device using a disposable bailer or low volume peristaltic pump. Groundwater samples will be transferred to laboratory -:ample bottles_ FAWp\1<,bs\205B7\101253 GMMCKVatCT%Vp.doc £VV-d 810/900 d ZZl-1 OV60VIM6 113 VY: W NMOH-=Jwr65:01 100Z-0£-adV