ARCHIVED REPORTS_XR0008919 - Laserfiche WebLink

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3.0 DRILLING AND SOIL SAMPLING METHODOLOGY A BSK & Associates engineer or geologist under direct supervision of a Registered Civil Engineer would be present during drilling and soil sampling Duties would include, but not be limited to • Filing permits and notifying SJPHS and Underground Service Alert 48 hours before field activities begin, • Coordination and timing of field activities, • Implementing the Health and Safety Plan, • Monitoring the air during drilling for the presence of volatile organic vapors; and, • Collection of soil samples and classification of soils based on the Unified Soil Classification System Drilling would be accomplished with a Mobile Drill B-53 truck mounted rig with eight-inch hollow stem auger Samples would be collected at five-foot intervals to a depth of approximately 75 feet for the boring B-1 and approximately 85 feet for the well bore MW-4 The samples would be collected by driving a two-inch I D sampler, fitted with stainless steel liners, 18 inches into relatively undisturbed soil. The ends of the retained sample would be covered with TeflonTM film and plastic caps The retained samples would be stored in a cooler with dry ice and maintained at 4°C or below. The samples would be transferred to RS personnel under normal chain-of-custody protocol on a daily basis Augers and drill rods would be cleaned with a high-pressure hot water cleaner before, between and after drilling each bore hole The equipment would be washed in a polyethylene lined containment basin The rinsate from the decontamination operation would be placed into DOT 17 E/H 55-gallon drums and labeled Soil cuttings from the borings would be contained in DOT 17 E/H 55 gallon drums and labeled The approximate location of the two soil borings would be within and adjacent to the former USTs excavation pit (refer to Figure 2) The boring located adjacent to the former excavation would be converted to a groundwater monitoring well Upon completion of each boring, the hole would be backfilled with neat cement by the tremie method 4.0 GROUNDWATER MONITORING WELL INSTALLATION AND DEVELOPMENT Drilling methods for the groundwater monitoring well installation would be performed as outlined in Section 3 0 of this Work Plan RS/RAGUIP92219/Sept 11,1992 (m�aewovkpin 992) 2 &A5sociates