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MIN <br /> e <br /> Between sampling events, equipment was cleaned using a three'nucket wash system. In this <br /> system, the brass liners and samplers are scrubbed in a bucket of tip water and detergent, rinsed <br /> in a second bucket of tap water and given a final rinse in a bucket of distilled vrater. <br /> 5.:2 Monitoring Well fnstalflation <br /> on <br /> All boring? were advanced to approximately 15 feet below static groundwater and converted to <br /> monitoring wells by the installation of 2-inch diameter, flush threaded, schedule 40 PVC screen <br /> �^ (0.010 slot) and casing. The wells were filter packed using pre-washed silica said with an <br /> z appro Timate .5-foot thick hydrated bentonite seal planed above the Hlter pack. An annular seal <br /> of neat cement was placed above the bentonite seal. All wells were completed at grade in water- <br /> tight, street-rated, well protectors and fitted :with locking caps for security purposes. All <br /> " procedures and protocol for groundwater monitoring well construction, conformed to standards <br /> set by the California Department of.Water Resources (CDWR) and the California Regional <br /> Water Quality Control Board (CRWQCB). <br /> .a <br /> Subsequent to well installation the monitoring wells were developed�1 � g peal using swab and pump <br /> methods. Development water was contained in DOT 17H drums and stored on-site pending <br /> laboratory analyses. <br /> The top, north side of the weIl casing was surveyed relative to a common datum for determining <br /> groundwater gradient information. Surveying was performed under the direct supervision of a <br /> California Registered Civil Engineer. Groundwater contours were constructed using a kriging <br /> program. <br /> Groundwater monitorng data(Table 1)collected during April 1991, indicate groundwater flow <br /> is toward the northeast at al proximately .07 ft/ft or 370 feet per mile(Figure 6). The estimated <br /> groundwater velocity at the site is 1.88 x 10-' feet per day using a porosity of .50 and a <br /> hydraulic conductivity of 10' gallons per day per square foot. These values of porosity and <br /> t, <br /> King talmW FWewt•387 <br /> M61691.wp tl <br /> r <br /> f, <br />