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10. CONSTRUCTION AND ABANDONMENT OF <br /> GEOPHYSICAL OR SEISMOLOGICAL TEST HOLES <br /> OR WELLS <br /> 10.1. The sealing of drilled geophysical or seismological borings shall be subject to the <br /> following requirements: <br /> 10.1.1. Borings shall be sealed with graded Bentonite chips or Bentonite rocks <br /> designed for use within geophysical shot holes. All graded Bentonite <br /> chips or rocks must have industry product guidelines showing the product <br /> to be acceptable for this use and environmentally safe. <br /> 10.1.2. Gravity installation of graded Bentonite chips or Bentonite rocks will be <br /> allowed with the aid of a conductor pipe or drill stem as long as the <br /> conductor pipe is placed within thirty (30) feet from the bottom of the <br /> drilled hole. <br /> 10.1.3. Any boring that uses less than the calculated amount of graded Bentonite <br /> or cement product will be redrilled to the original depth and resealed <br /> according to the above procedures. <br /> 10.2. A San Joaquin County Environmental Health Specialist will be present during <br /> drilling and sealing of all holes drilled in the waterways of San Joaquin County. <br /> 11 . CATHODIC PROTECTION WELLS <br /> 11.1. Cathodic Protection Wells are not specifically outlined in these Standards; <br /> however, Cathodic Protection Wells are addressed in the Department of Water <br /> Resources Bulletin 74-90. <br /> 12. SPECIFIC STANDARDS FOR PROBLEM AREAS IN <br /> SAN JOAQUIN COUNTY <br /> 12.1. It is recognized that specific problem areas exist in San Joaquin County, and it is <br /> the intent of these Special Standards to allow well construction, if appropriate, <br /> while maintaining the integrity of the groundwater. <br /> 12.1.1. Wells to be constructed in areas of known or suspected contamination <br /> may be required to determine water quality characteristics prior to <br /> construction. <br /> 12.1.2. Wells constructed or destroyed in areas of known or suspected <br /> contamination may be required to seal the annular space to a depth <br /> greater than those specified in Section 4.7. and Section 6., respectively. <br /> The depth of the annular space seal will be reviewed on a site-specific <br /> basis and determined by the Director. <br /> 12.1.3. All aquifers containing saline water shall be properly sealed off to prevent <br /> intermingling. <br /> 12.1.4. Minimum distance between wells and sources of contamination shall be <br /> maintained as specified in Section 3.1. of these Standards. <br /> EHD 43-03 Page 19 of 27 WELL STANDARDS <br /> 10/9/07 <br />