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SSE <br /> 1 - <br /> L�3 <br /> a <br /> Harding Lawson Associates <br /> F,. hollow-stem augers. Samples were collected with a 2-1/2-inch ID <br /> modified split-barrel sampler lined with 6--inch-long brass tubes. <br /> The borings were logged and soils classified in the field, and <br /> classifications were checked in HLA's laboratory. All samples <br /> were sealed at both ends with aluminur,, foil, plastic caps, and <br /> tape, and placed in a cooled, insulated container for transport : <br /> to the chemical testing laboratory. Chain-of-custody records <br /> were maintained for each sample. All soil cuttings were stored <br /> in 55-gallon metal drums pending chemical analysis. Disposal of <br /> e <br /> f these drums was arranged by Southland. Logs of borings are in <br /> Appendix A. <br /> All drilling and sampling equipment was thoroughly cleaned <br /> before initiation of field work and between uses. Sampling <br /> equipment was cleaned in a solution of trisodium phosphate (TSP) <br /> . and water, then rinsed with clean water. Augers were steam-- <br /> _ a <br /> cleaned to minimize the possibility of cross-contamination, f <br /> Li <br /> s C. Monitoring Well Installation <br /> r. <br /> t At the completion of the soil sampling program, monitoring <br /> wells were installed in seven of the eight burin ; <br /> � gs as follows. <br /> f T <br /> Wells were constructed using 4-inch-diameter, 5chedul.e...40 ..PVC...._.._. <br /> _... . <br /> casing with 0.020-inch slotted screen. The annular space between <br /> r <br /> k screen and boring was backfilled with No. 3 Monterey sand. A. 12 <br /> to 16-inch layer of bentonite pellets was placed on top of the <br /> � r~ <br /> t i <br /> sand and the remainder of the annular space backfilled with a <br /> 8 neat cement grout Each well was secured by a locking water- <br />