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1 <br /> 1 <br /> GROUNDWATER SAMPLE COLLECTION <br /> Sample collection procedures Included equipment cleaning, water-level and total well-depth <br />' measurement, and well purging and sampling <br /> Equipment,Cleaning <br /> Pre-cleaned sample bottles, caps, and septa were provided by a California Department of <br /> Health Services (DHS)-approved laboratory All sampling containers were used only once <br /> and discarded after analyses were completed <br />' Before the sampling event and between each event all equipment to be laced in the well or <br /> P gP <br /> 1 to come in contact with groundwater was disassembled and cleaned thoroughly with detergent <br /> water, steam cleaned with tap water, and rinsed with deionized water Any parts that may <br /> absorb contaminants, such as plastic pump valves or bladders, were cleaned as described <br />' above or replaced The water-level sounder was washed with detergent and rinsed with <br /> distilled water before use in each well The rinse water was stored in 55-gallon drums on site <br /> pending proper disposal <br />' Water-Level Phase-Separated Hydrocarbon, and Total Well-Depth Measurements <br /> Before purging and sampling were performed, the depth to water, phase-separated <br />' hydrocarbon (PSI) thickness, and the total well depth were measured using an electric <br /> sounder, a bottom-filling clear Lucitelm bailer, and/or an oil/water interface probe The <br />' electric sounder, manufactured by Slope-Indicator, Inc , is a transistorized instrument that <br /> uses a reel-mounted, two conductor, coaxial cable that connects the control panel to the <br /> sensor Cable markings are stamped at 1-foot intervals An engineer's rule was used to <br /> measure the depths to the nearest 0 01 foot The water level was measured by lowering the <br /> sensor Into the monitoring well A low-current circuit is completed when the sensor contacts <br /> the water, which serves as an electrolyte The current is amplified and fed across an indicator <br /> light and audible buzzer, signaling contact with water A sensitivity control compensates for <br /> Every saline or conductive water After the water level had been determined, the bailer was <br /> lowered to a point just below the liquid level, retrieved, and inspected for PSH <br /> 04118l94l12138211259971DRILDONE DOC <br />