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CA ARNG Field Quality Assurance Project Plan 8.7.5 If the well is located in an area of known or potential pollutant and the well was not constructed or maintained according to current well construction standards as set forth in Bulletin 74-90, it is required that all material within the original borehole,including the well casing,filter pack, and annular seal, be removed during destruction activities.The created hole must be completely filled with the appropriate sealing material(DWR, 1991). 8.7.6 If the well casing was not extracted during destruction and sealing operation,the upper surface of the sealing materials must end at a depth of 5 feet below ground surface(bgs)or less. A hole must be excavated around the well and casing shall be cut off at 5 feet bgs.The excavation must then be backfilled with clean,native soil or other suitable material.The excavation operations must be performed after the sealing material has adequately set and cured(DWR, 1991). I 8.7.7 Wastewater generated by sampling and abandonment activities must be handled according to guidelines provided by applicable provisions of California Code of Regulations(CCR)Title 22, including recommendations for disposal as hazardous or designated waste,as appropriate. 8.8 Permits Required 8.8.1 All necessary permits will be obtained prior to commencing the field work.A Permit to Abandon Well will be obtained from the applicable agency. Prior to obtaining the permit,this work plan may be reviewed. 8.8.2 Basic guidelines to decommission monitoring wells are provided in American Society of Testing and Materials (ASTM)Standard D5299-92, Decommissioning of Groundwater Wells, Vadose Zone Monitoring Devices, Boreholes,and Other Devices for Environmental Activities.This standard covers procedures that are specifically related to permanent decommissioning(closure) of the following as applied to environmental activities. It is intended for use where solid or hazardous materials or wastes are found,or where conditions occur requiring the need for decommissioning(ASTM, 1993).The following devices are considered in this guide: • A borehole used for geoenvironmental purposes; • Monitoring wells; • Observation wells; • Injection wells; • Piezometers; • Extraction wells; • A borehole used to construct a monitoring well;and • Any vadose zone monitoring device. 8.8.3 The primary purpose of abandonment activities is to permanently decommission the monitoring well so that the natural migration of groundwater or soil vapor is not significantly influenced. Decommissioned wells should have no adverse influence on the local environment(i.e.,the original field QAPP.DOC 8-6 May 2000