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..,o <br /> INVESTIGATIVE METHODS <br /> FIELD PROCEDURES <br /> All site activities were conducted under the direct supervision of a State of California <br /> Registered Geologist having five or more years of professional experience in groundwater <br /> hydrology. The field operations were conducted by a qualified sampling technician <br /> designated by the supervising Registered Geologist. All field operations were governed by <br /> ,. the requirements of the Health and Safety Plan. All field operations personnel were <br /> trained in accordance with 29 CFR 1910 (40-hour OSHA Health and Safety Training). <br /> The groundwater sampling event took place on 28 April 1992. Sampling consisted of <br /> determining the groundwater surface elevation in the monitoring wells, purging stagnant <br /> groundwater from the wells and collecting samples of fresh groundwater entering the well <br /> following well recovery. <br /> WATER LEVEL MEASUREMENTS <br /> Before sampling of the groundwater monitoring wells, the depth to water in the wells was <br /> measured to the nearest 0.01-foot and recorded. Depth to water measurements were <br /> obtained relative to a marked reference point located on the top of the well casing using an <br /> electric Solinst water sounding device. The measuring equipment was thoroughly <br /> decontaminated before use by washing in a solution of Liqui-Nox detergent and tap water, <br /> rinsing with tap water, and re-rinsing with deionized water. <br /> GROUNDWATER SAMPLING <br /> Each 2-inch diameter monitoring well was purged of groundwater before sample collection <br /> with the aid of a disposable 1-'/z-inch diameter by 3-foot long polyethylene bailer. The <br /> volume of water contained in each well was calculated using the inital depth to water and <br /> the known depth of the bottom of the well. Water and sediment in the well were removed <br /> rl-P-W--2) Page 5 <br /> AMERICAN <br />