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Table of Contents <br /> 1. Definitions......................................................................................................................... 4-8 <br /> 2. Permits.............................................................................................................................. 8-9 <br /> 3. Locations .......................................................................................................................... 10 <br /> 4. Construction or Repair...................................................................................................... 10-17 <br /> Drilling Fluid, foam and water.................................................................................... 10 <br /> Sealingoff strata ....................................................................................................... 10 <br /> Casing ....................................................................................................................... 11 <br /> Minimum thickness for steel well casing ................................................................... 12 <br /> Installationof casing.................................................................................................. 12 <br /> Gravelinstallation...................................................................................................... 12 <br /> Perforations............................................................................................................... 12 <br /> Well grouting and construction.................................................................................. 13-14 <br /> Welldevelopment...................................................................................................... 14 <br /> Wellcover.................................................................................................................. 14 <br /> Surfaceseal .............................................................................................................. 14-15 <br /> SanitarySeal............................................................................................................. 15 <br /> Sounding tube and air vent pipe................................................................................ 15-16 <br /> Samplingtap ............................................................................................................. 16 <br /> Backflowprevention .................................................................................................. 16 <br /> 5. Out of Service Wells......................................................................................................... 17 <br /> 6. Destruction of Wells.......................................................................................................... 17-18 <br /> Sealingrequirement.................................................................................................. 17-18 <br /> 7. Inspection of wells ............................................................................................................ 18 <br /> 8. Disinfection of wells.......................................................................................................... 19 <br /> 9. Sampling of wells.............................................................................................................. 19-20 <br /> PublicWater Systems............................................................................................... 19 <br /> Individual Domestic Water Well................................................................................. 19-20 <br /> 10. Construction and Abandonment of geophysical or <br /> seismological test holes or wells....................................................................................... 20 <br /> 11. Cathodic Protection Wells................................................................................................. 20 <br /> 12. Specific Standards for problem areas in San Joaquin County ......................................... 20-21 <br /> 13. Monitoring Wells............................................................................................................... 21-30 <br /> Applicationto well type.............................................................................................. 21 <br /> Exemptions for unusual conditions............................................................................ 21 <br /> Permits...................................................................................................................... 21-22 <br /> Location..................................................................................................................... 22 <br /> Inspectionof wells..................................................................................................... 22 <br /> Contractor requirements............................................................................................ 22-23 <br /> Reports...................................................................................................................... 23 <br /> Casing ....................................................................................................................... 23-24 <br /> ConductorCasing...................................................................................................... 24 <br /> FilterPack Material.................................................................................................... 24-25 <br /> TransitionSeal .......................................................................................................... 25 <br /> Sealing the upper annular space............................................................................... 25-26 <br /> Temporarycover....................................................................................................... 26 <br /> SurfaceSeals............................................................................................................ 26-27 <br /> WellDevelopment..................................................................................................... 28 <br /> Rehabilitation and repair of monitoring wells............................................................. 28 <br /> Requirements for destroying monitoring wells and exploration holes....................... 28-30 <br /> EHD 43-03 Page 3 of 27 WELL STANDARDS <br /> 10/9/07 <br />