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BC&D Property <br /> ` Phase II-Ground Water Assessment Proposal <br /> Page: 4 <br /> 4.0 QUALITY ASSURANCE PROGRAM <br /> The following measures will be taken by Geological Technics to insure that a high quality <br /> study is conducted and that cross contamination does not occur. <br /> 4.1 Equipment <br /> - Monitoring well borings will be drilled with a 7.25-inch and a 1(3 inch(o.d.)hollow <br /> stem continuous flight auger,owned and operated by Osterberg and Stewart,Inc. Soil <br /> samples will be -inch using a 2-inch(a.d.)modified California split spoon sampler <br /> lined with brass sample tubes. <br /> 4.2 Boring Logs <br /> Detailed logs will be made of each boring. The information noted will include: sample <br /> depths,blow counts,horizons of detectable contamination(detected by field methods), <br /> r { soil classification utilizing the Unified Soil Classification System and sediment <br /> �,►``' description(color,texture,composition,hardness,moisture content,and post- <br /> jdeposition,11 changes that have occurred in the sediments). <br /> 4.3 Soil Sampling <br /> Soil samples will be collected at 5.Foot intervals in the first boring to characterize the <br /> sediment types and to confirm the lateral continuity of the strata. If a contamination <br /> odor is detected in soil above the aquifer,soil samples will be collected and analyzed. <br /> Ii <br /> Brass sample tubes will be sealed with aluminum foil,capped,labeled and <br /> immediately refrigerated for transport to the analytical laboratory. Soil samples not <br /> s r°? analyzed will be kept refrigerated until project completion. <br /> 4.4 Sample Screening <br /> Becase not every soil sample collected will be analyzed,a screening process is used to <br /> L <br /> select t vpresentative samples. The goal of this selective process is to reduce the cost of <br /> the r-�_"without compromising the quality. From field observations noting sediment <br /> r type,moisture content,and the presence of contamination odor certain samples can be <br /> -- ---- - — — - -------selected that represent discrete horizons.-The presence of..contamination.barriers.can______._______________ <br /> also be detected by this method. <br />