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a <br />9M <br />A-5 Measuring Depths to Water and Calculating Groundwater Elevations: Monitoring <br />well locations and top -of -casing elevations will be surveyed by a California -licensed land <br />surveyor. Surveyed data will be referenced to a local benchmark, an assumed local datum, <br />or a United States Geological Survey benchmark. The surveyed data will be accurate to ± <br />0.01 feet. <br />Depth to groundwater will be measured relative to a surveyed point on the north edge of <br />the well casing rim. The water depths will be measured using an electronic water sensing <br />meter with a precision accuracy of ± 0.01 feet. The depth to water in each well at a site <br />will be measured in a single day. Measurements will be recorded on the daily field log. <br />If floating hydrocarbons are suspected, a bottom -filling clear bailer or hydrocarbon detecting <br />paste bailer may be used to record floating hydrocarbon thickness. The bailer will be <br />lowered to a point just below the liquid level, retrieved, and observed for floating <br />hydrocarbon. <br />Groundwater elevations will be calculated by subtracting measured water depths from <br />surveyed casing rim (measuring point) elevations. The direction of groundwater flow and <br />gradient will be calculated using the groundwater elevation data. <br />A-6 Decontamination Rinsate, Monitoring Well Purge Water, <br />and Soil Cuttings Disposal: The soil cuttings generated by drilling operations will be <br />retained on site, and either covered by plastic sheeting or containerized in Department of <br />Transportation -approved drums. The drilling equipment will be steam -cleaned on racks, and <br />the rinsate will be retained in a steel trough, and then transferred to drums. Water purged <br />from monitoring wells will be containerized in drums if contamination is known or <br />suspected. Drums containing soil, rinsate, and purged water will be sealed and temporarily <br />stored on site at a location remote to the public. Each drum will be labelled to identify its <br />contents. Disposal of these wastes will be the responsibility of the client. The client will <br />be informed that the wastes must be disposed in accordance with applicable Federal, State, <br />and local regulations. <br />