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I Kennedy/Jenks/Chilton i Attachment A to Kennedy/Jenks/Chilton's • letter to Mr. Charles Whitworth dated 14 July 1989 Page 2 Teflon lined tight fitting cap and labeled as field blanks. The field blanks were analyzed as part of the laboratory quality assurance/quality control (QA/QC) program. BORING INSTALLATION AND SAMPLING PROCEDURES = All borings were drilled using a truck mounted drilling rig utilizing eight- inch hollow-stem augers (nominal outside diameter) as the drilling method. Soil samples were collected for describing site lithology and performing laboratory analyses from each of the borings, including the borings subsequently used for completion as monitoring wells. Samples collected for describing the site lithology were obtained from a five-foot long continuous core. The continuous core was pushed concurrently with the hollow-stem auger during drilling. Lithologic descriptions of the site soils are included on the boring logs presented in Attachment B. Undisturbed soil samples collected for laboratory analyses were obtained from i a two-inch (inside diameter) split-spoon drive sampler with six-inch long brass liners inserted inside the sampler to retain the samples. The two-inch split-spoon drive sampler was driven approximately 18 inches into the soil at each drive interval using a 140 pound drive hammer free-falling approximately three feet. After the sampler was driven approximately 18 inches, it was extracted from the borings Soil from one brass liner was placed in a self-sealing plastic container and exposed to direct sunlight to promote volatilization of constituents that may be present in the soil . After approximately five to 10 minutes, the container was opened enough to quickly insert the probe of an organic vapor analyzer } into the bag to measure the organic vapor content The organic vapors were recorded on each boring log. One of the other six-inch brass liners at each 1 sample interval containing soil was covered on both ends with a Teflon sheet and a tight-fitting plastic cap. Labeling, storage, and shipping for these samples was similar to the procedures described for the surface soil samples listed above. A copy of all chain-of-custody forms filled out for samples collected during this preliminary investigation are included in Attachment C. Laboratory analyses of the these samples are discussed in the report After drilling and sampling was completed, borings B-i and B-2 were immediately backfilled using a cement/bentonite grout mixture consisting of approximately two pounds of bentonite powder, seven gallons of potable water obtained from a nearby water source, and approximately 94 pounds (one sack) of • Portland cement. The bentonite was allowed to hydrate to the water for approximately five minutes before the cement was added The bentonite and water were mixed using a high pressure grout pump which mixed and hydrated the bentonite. After the bentonite was adequately hydrated the cement was added