Laserfiche WebLink
10.4.6 Wells Constructed Into Type 112 Aquifers (Unconfined Bedrock Aquifers or Aquifers Not <br /> Overlain by a Confining Unit): Wells constructed into a Type 142 Aquifer must have at least <br /> forty (40) feet of solid casing, from at least one (1) foot above to at least thirty nine (39) feet <br /> below ground level, and must have at least thirty (30) feet of continuous grout. The uppermost <br /> twenty (20) feet of solid casing (including surface or production) must be steel casing. <br /> 10.4.6.1 Casing Requirements - <br /> a. Wells completed in a Type 142 aquifer(unconfined bedrock aquifer—see Rule <br /> 5.2.2.23.3) that are constructed without surface casing must have solid casing <br /> with watertight joints installed from the top of the permitted production zone to <br /> the top of the well. <br /> b. Wells completed in a Type 142 aquifer (unconfined bedrock aquifer)that <br /> are constructed with surface casing must have solid casing with watertight <br /> joints installed from the top of the permitted production zone to at least ten <br /> (10) feet above the base of the surface casing. <br /> 10.4.6.2 Grouting Requirements for Wells Constructed into Type lI Aquifer <br /> (unconfined bedrock aquifer►2 Aquifers Not Overlain by a Type 1143 <br /> Aquifer(alluvial/colluvial aquifer) -Wells completed in a Type 142 aquifer <br /> (unconfined bedrock aquifer) that do not penetrate through a Type 1-443 <br /> aquifer ( olidated) must have at least thirty (30) feet of continuous <br /> approved or bulk grout and must be grouted in accordance with the following: <br /> a. If no surface casing is installed, grout must be placed in the annular space <br /> between the production casing and the borehole wall from a depth of at least <br /> thirty-nine (39) feet up to the depth required by Rule 10.5.2.1. See Figure 4c. <br /> b. If surface casing is installed to a depth less than thirty-nine (39) feet below the <br /> land surface and grouted to the depth required by Rule 10.5.2.1, the annulus <br /> between the borehole wall and the production casing string must be grouted <br /> from a depth of at least thirty-_nine (39) feet below the surface back to a level <br /> that is at least ten (10) feet above the base of the surface casing. See Figure <br /> 4c- <br /> c. If surface casing is installed to at least thirty-nine (39) feet below the surface, <br /> the annulus between the surface casing and the production casing string need <br /> not be grouted if the annular space between the borehole wall and the surface <br /> casing is grouted from a depth of at least thirty-nine (39) feet up to the depth <br /> required by Rule 10.5.2.1. <br /> d. If the surface casing is driven, grout must be placed to meet the requirements <br /> of Rule 10.4.2.1 (see Figure 3). <br /> 10.4.6.3 Grouting Requirements for Type 112 Aquifer Overlain by a Type 111 <br /> 3 Aquifer(Alluvial/Colluvial) -Wells completed in a Type 142 aquifer <br /> (unconfined bedrock aquifer) <br /> that penetrate through a Type 1113 aquifer (unconsolidated aquifer) <br /> must fhave at least thirty (30) <br /> feet of continuous approved or bulk grout and must isolate the c1atic <br /> Type 111-3 <br /> aquifer interval from the Type 2 interval in accordance with grout or <br /> driven steel casing.the following: <br /> a. If no surface casing is installed, grout must be placed in the annular space <br />