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Clayton Group Services In general, groundwater monitoring wells are used for obtaining groundwater samples for determining groundwater quality, observing groundwater levels and flow conditions, and evaluating hydrologic properties of the subsurface aquifers. Some groundwater monitoring wells are installed solely for water level measurement, and these commonly are called piezometers, in reference to the "piezometric surface" or potentiometric surface which is the groundwater surface. Monitoring well installation shall follow California Department of Water Resources Bulletin 74-90 (Supplement to Bulletin 74-81) - California Well Standards and ASTM standards, Designation D 5092 - 90 Standard Practice for Design and Installation of Ground Water Monitoring Wells in Aquifers. By reference, these standards are incorporated into these Standard Operating Procedures. Competent drilling companies and drillers are highly experienced in the installation of groundwater monitoring wells; however, implementation of implementation of the Work Plan, being certain that the Health and Safety Plan is being followed, and supervision of the drilling are the responsibility of the on-site geologist, not the driller. In general, the driller can be relied on to properly drill the soil boring to the specified depth and install the monitoring well following the on-site geologist's specifications and the above- mentioned standards. PROCEDURES 1. A Work Plan should be developed prior to monitoring well installation addressing such concerns as tentative well locations, casing size (generally 2- or 4 -inch diameter), casing material (generally schedule 40 PVC, but may be stainless steel), tentative screen interval, tentative well depth, etc. Obviously this information needs to be conveyed to the driller prior to the start of field work so that he has the proper supplies and equipment at the time of well installation. A site-specific Health and Safety Plan also needs to be prepared. 2. Obtain a drilling permit form the appropriate regulatory agency (Los Angeles County Department of Health Services, Orange County Health Care Agency, etc.).