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� �" � ,�. ra- `�. his,,:' :�• <br /> The soil in the lower six-inch ring of the sampler is used for laboratory analysis. <br /> immediately after the rings are retrieved, the lower ring is sealed with a teflon lined end <br /> cap and secured with tape. I'Ize sample is then labeled and placed in an ice chest for cold <br /> transport under proper chain of custody to a state certified chemical laboratory for analyses. <br /> The soil in the upper six-inch ring is used for lithologic description <br /> and olfactory examination. Soil is described using the Unified Soil Classification System. <br /> A portion of this soil may be temporarily placed in a plastic bag and used for examination <br /> with a portable organic vapor analyzer. All field descriptions and measurements are <br /> documented on bore hole logs. <br /> Ground-Water Monitoring Well Construction <br /> Ground-water monitoring wells are constructed according to the general specifications <br /> E- <br /> shown on the attached Well Construction Diagram. The wells shall extend a minimum of <br /> 10 feet into the upper aquifer, unless a clay layer greater than five feet in thickness is <br /> found. The wells shall not extend through a laterally extensive clay layer belo-ei the upper <br /> aquifer unless circumstances warrant the investigation of deeper aquifers. In the event an <br /> extensive clay layer must be penetrated care shall be taken to assure that mixing of water <br /> or contaminated soil does not occur. <br /> For single-cased wells,the monitoring well casing,with an end cap,shall extend to the base <br /> of the bare hole or into a bentonite plug. The casings shay_ be factory perforated to the <br /> y~ specifications delineated in the site work plan and compatible with the litbology of the <br /> - aquifer found in the field.The perforated casing will extend five feet above the top of the <br />