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1 <br />' ATTACHMENT A <br /> FIELD AND LABORATORY PROCEDURES <br /> 1 <br />' Drilling and Monitoring Well Installation <br />' Boring Installation <br /> The boring for the soil borings and groundwater monitoring wells were drilled according to <br />' state and local regulatory guidelines The soil borings and wellbores were drilled using 8-inch <br /> diameter hollow-stem auger drilling equipment The boring was logged by a Pacific <br /> Environmental Group, Inc geologist using the Unified Soil Classification System and standard <br />' geologic techniques Soil samples for logging and chemical analysis were collected at 5-foot <br /> depth intervals by advancing a California-modified split-spoon sampler with 6-inch brass liners <br /> into undisturbed soil beyond the tip of the auger The sampler was driven a maximum of <br /> 18 inches using a 140-pound hammer with a 30-inch drop The brass liner containing the <br /> deepest 6 inches of soil from each sample interval was retained for chemicaI analysis, and was <br /> capped with Teflon tape squares and plastic end caps and then placed in a sealable plastic bag <br /> These samples were placed on ice for transport to the laboratory accompanied by chain-of- <br /> custody documentation All down-hole drilling equipment was steam-cleaned prior to drilling <br /> 1 All residual soils obtained from drilling operations were stockpiled on site and covered with <br /> plastic sheeting until laboratory analyses were completed and the results evaluated Arrange- <br /> ments were then made for disposal to an appropriate landfill based on analytical results <br /> Groundwater Monitoring Well Installation <br />' The boring was converted to a groundwater monitoring well by the installation of 2-inch <br /> diameter flush-threaded Schedule 40 PVC casing with 0 020-inch factory-slotted screen from <br />' 6 to 20 feet below ground surface, and Schedule 40 PVC solid casing to the ground surface <br /> The annular space was filled with RMC 2 x 12 sand across the entire screened interval, <br /> 1 extending approximately a 112 foot above the top of the screen The wells was then sealed <br /> with approximately a 112 foot of bentonite above the top of the sand pack, and a cement seal <br /> to the ground surface Locking watertight caps and protective vault boxes were installed on <br /> Ithe wells The attached boring logs show well construction details <br /> 3100971A/REPORT A - 1 November 22, 1995 <br />