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1 each well relative to the California Coordinate System, using the TOC elevations and a benchmark Elevations will be measured to a precision of 0 01 feet, and horizontal control will be surveyed to a precision of 0 5 feet A v-shaped notch will be cut in the north side of the top of the PVC casing and will be the reference for the elevation measurements A permanent metal identification tag will be attached to each well and will include the following data well number, date drilled, depth, contractor name, and screen interval 3.3.6 Ground-Water Sampling ' Monitoring wells will be allowed to stabilize for at least 48 hours after well development is completed and before ground-water sampling activities are initiated One ground-water sample will be collected for laboratory analysis from each well Ground-water sampling consists of the following activities and will be performed in the order presented below Organic Vapor Check Prior to the initiation of well sampling procedures, the interior of each well will be checked I with a PID for the presence of organic vapors The well cap will be opened slightly, allowing for the insertion of the PID probe tip inside the well Readings will be monitored and recorded in the field ' logbook The cap will then be removed and the well allowed to vent for a short period of time prior to measuring static water level Static Water Level/Total Well Depth Measurement ' Prior to initiating well purging procedures, the static water level at each well will be measured with a decontaminated sounder The reference point used will be the TOC mark, and the ' depth to water below the reference point will be measured to the nearest 0 01 foot and recorded in the field logbook 1 The bottom of the well will also be measured, with a decontaminated weighted fiberglass ' tape, to the nearest 0 01 foot The amount of fill material in the bottom of the well will be calculated 5AMPL"162 044-0162LTrATAI0/0W2 18