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Work Plan for Environmental Investigation June 21, 1989 <br /> Waterfront Redevelopment, Stockton, California AGS 39048-1W <br /> _ F <br /> During drilling, soil samples will be collected from 5 feet below <br /> existing grade to the total depth of the boring at 5-foot &2 01 <br /> intervals or obvious changes in sediments. Soil samples will be V2 <br /> collected using a California-modified, split-spoon sampler t f�f <br /> equipped with clean brass sleeves. Samples will be collected by <br /> advancing the auger to a point immediately above the sampling <br /> depth and driving the sampler through the auger into the native <br /> soil. The sampler will be driven 18 inches or to refusal with a <br /> standard 140-pound hammer repeatedly dropped 30 inches. The <br /> number of blows required to drive the sampler each successive <br /> 6-inch interval will be counted and recorded to give an <br /> indication of soil consistency. Sampling refusal will be defined <br /> as more than 50 blows for a 6-inch interval. Examples of a Field <br /> Boring Log and Log of Boring Plate used in our report are <br /> included in the Appendix to this Work Plan. <br /> A representative sample from each sample interval will be tested <br /> with a photoionizing organic vapor meter (OVM) . The OVM is <br /> useful for evaluation of relative concentra iont s of volatile <br /> hydrocarbons but cannot be used to measure levels of <br /> contamination with the confidence of laboratory analysis. Soil <br /> samples selected for chemical analysis will include the sample <br /> taken from immediately above the ground-water surface and the <br /> 12 <br /> A,vn/ied GwSystems <br />