COMPLIANCE INFO_1993-1994 - Laserfiche WebLink

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City of Stockton TL# 394-0027-01 March 10, 1994 Page 10 Purged water will be containerized in Department of Transportation- approved drums, and stored on site in an area inaccessible to the general public. The purged water is typically characterized either by sampling it, or on the basis of the groundwater sample analytical results. Twining can recommend an appropriate method for disposition of the purged water. Disposal will be the responsibility of the client. A-5 Measuring Depths to Water and Calculating Groundwater Elevations : Monitoring well locations and top-of-casing elevations will be surveyed by a California-licensed land surveyor. Surveyed data will be referenced to a local benchmark, an assumed local datum, or a United States Geological Survey benchmark. The surveyed data will be accurate to + 0.01 feet. Depth to -groundwater will be measured relative to a surveyed point on the,north edge of the well casing rim. The water depths will be measured using an electronic water sensing meter with a precision accuracy of + 0 .01 feet. The depth to water in each well at a site will be measured in a single day. Measurements will be recorded on the daily field log. If floating hydrocarbons are suspected, a bottom-filling clear bailer or hydrocarbon detecting paste bailer may be used to record floating hydrocarbon thickness. The bailer will be lowered to a point just below the liquid level, retrieved, and observed for floating hydrocarbon. Groundwater elevations will be calculated by subtracting measured water depths from surveyed casing rim (measuring point) elevations . The direction of groundwater flow and gradient will be calculated using the groundwater elevation data. A-6 Decontamination Rinsate, Monitoring Well Purge Water, and Soil Cuttings Disposal: The soil cuttings generated by drilling operations will be retained on site, and either covered by plastic sheeting or containerized in Department of Transportation- approved drums . The drilling equipment will be steam-cleaned on racks, and the rinsate will be retained in a steel trough, and then transferred to drums. Water purged from monitoring wells will be containerized in drums if contamination is known or suspected. Drums containing soil, rinsate, and purged water will be sealed and temporarily stored on site at a location remote to the public. Each drum will be labelled to identify its contents. Disposal of these wastes will be the responsibility of the client. The client will be informed that the wastes must be disposed in accordance with applicable Federal, State, and local regulations.