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SMTH SITE SAFETY PLAN <br /> ' FACILITY BACKGROUND <br /> Shinko Electric America (Shinko) occupied the site from 1982 to 1990. Shinko used the site <br /> for manufacturing computer components. The operation involved metal stamping; <br /> electroplating(copper,silver, gold);cutting and packaging; waste water treatment; utilizing <br /> bulk chemicals including acids, caustics, and cyanide; and generating several types of <br /> ' hazardous waste. Wastes included acid, caustic, and cyanide solutions. <br /> In October 1994, Greensfelder & Associates conducted a subsurface investigation at the <br /> ' site. The investigation included drilling six borings, collecting soil and groundwater <br /> samples for laboratory analysis, and determining groundwater flow direction at the site. <br /> Results of the laboratory analyses indicated low (background) concentrations of some <br /> ' priority metals in soil and groundwater samples, as well as low concentrations of one <br /> organic compound in groundwater samples. <br /> ' WORK PLAN <br /> Task One: Three soil borings will be advanced to depths of approximately 35 feet and <br /> one soil boring will be advanced to approximately 23 feet using 10-inch O.D. <br /> ' hollow stem augers. A field geologist will be present to log all drill cuttings <br /> and soil samples. Descriptions of soil types encountered, sample collection <br /> intervals, and well construction details will be recorded. Soil samples will be <br /> ' collected at five foot intervals and one groundwater sample will be collected <br /> for laboratory analysis. <br /> All drill cuttings will be placed on and covered with plastic and stored on-site <br /> pending laboratory results. Three borings will be completed as groundwater <br /> monitoring wells, constructed of PVC well screen and casing. The fourth <br /> ' boring will be grouted to ground surface. <br /> Task Two: SMTH personnel will measure the depth to water in the wells and will <br /> ' develop the new wells until the produced water is relatively sediment free. <br /> Prior to the collection of groundwater samples, a minimum of three well <br /> volumes will be purged. Temperature, pH, water elevation, and electric <br /> conductivity will be measured and allowed to stabilize. Water samples will <br /> be collected using disposable bailers, one dedicated to each well. <br /> ' Groundwater samples collected from all monitoring wells will be submitted <br /> for laboratory analysis. Purge water will be stored in 55-gallon drums <br /> approved for hazardous liquid storage pending laboratory analysis. The top <br /> ' of the new wellheads will be surveyed. <br /> ' PAGE2 <br />