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which agitated the water column and encouraged the sand to settle After this a bentonite pellet <br /> seal was emplaced, then the remaining borehole annulus was grouted to the surface The grout <br /> was pumped from the bottom to the top using a tremae hose The grout was composed of a <br /> cement/bentonite mixture All grouting was observed and approved by a representative from <br /> the San Joaquin County Public Services, Environmental Health Division Monitoring well <br />' design specifications are presented in Table A-1 <br /> Well development was conducted July 26, 1991 Each well was developed by a combination <br />' of bailing, swabbing and pumping until the water in the well was relatively clear and free of <br /> sediment, as determined by WESTON personnel onsite All development water was <br />' containerized in 55 gallon steel drums and stored on the lot at the southwest corner of San <br /> Joaquin and Market Streets <br /> tEquipment Decontamination <br /> All devices used to drill the wells and collect soil samples (including augers, bits, split spoons, <br />' etc ) were decontaminated prior to first use and between uses Auger flights and bits were <br /> decontaminated by steam cleaning, and smaller tools were cleansed by scrubbing with potable <br /> water and a stiff bristle brush, followed by a potable water final rinse <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> RM/SIC WP <br /> A - 2 <br />