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Due to the size of the casing with centralizers, 11.25" at the couplings and 15.5" at the <br /> centralizers there is no guarantee that the bit will stay on the casing <br /> If the bit did manage to stay on the casing to the screen there is no guarantee that the bit <br /> would stay on the hole due to the wires balling up (this is a wire wrap screen .188 wire). <br /> EW-18 is a groundwater extraction well and the SJC Well Standards for destruction of <br /> groundwater extraction wells (Section 6) specify that extraction wells will be destroyed by <br /> sealing the interior of the well casing. <br /> Blasting is not recommended for the following reasons: <br /> Because of the close proximity to two existing extraction wells, one that has a screened <br /> interval the same as the interval that would be blasted. There is a high chance it would be <br /> impacted from the blast. <br /> Because of the age of the grout (less than 30 days) there is no guarantee that the grout will <br /> flow into the fractures created by the blast. <br /> The well location is in close proximity to a surface water basin and blasting could cause <br /> ground movement and damage the basin. <br /> The property owner will not allow explosives on the property due to health and safety <br /> hazards associated with the materials that are manufactured at the facility. <br /> I have attached a location map the a-log and information on the perforating tool for your <br /> reference. If you have any questions please feel free to call or email. <br /> Thank You �� � ?�3 i3,1 -7. �� <br /> Randy Dockery <br /> Project Manager <br /> Gregg Drilling, LLC <br /> 950 Howe Rd <br /> Martinez, CA 94553 <br /> 925-313-5800 <br /> 925-313-0302 (? 17. y <br />