DDW-2024-009693

J. Paul Wright <[e-mail]>
Johnson Canyon Well #4 (WS006) File #15254 - Review Comments
1 message
J. Paul Wright <[e-mail]>
To: Glen Carnahan <[e-mail]>, Brent Gardner <[e-mail]>
Cc: [e-mail], Kane County Water Conservancy District <[e-mail]>, Mike Noel <[e-mail]>
Glen and Brent,
I have reviewed the drilling plans for the Kane County WCD - Johnson Canyon (13038), Johnson Canyon Well #4 drilling project and I have some questions/comments.
1) The bid schedule (Section 107, Bid Item 1.2) shows that a 20" borehole and 20" casing will be installed. I have a couple of questions and some corrections needed:
The borehole needs to be at least 4 inches larger in diameter to accomodate a proper grout seal. The drawing calls out at least a 2-inch annular space, but does not specify the minimu
The bid schedule should be corrected to reflect this.
The 20-inch conductor casing type (steel I assume) and thickness have not been specified, this needs to be clarified.
2) The bid schedule (Section 107, Bid Item 1.4) shows that a 20" borehole will be drilled to the bottom of the hole, however the drawing shows the borehole being slightly smaller than 20 inch
conductor casing (20-inch) is installed, it needs to sit on that shelf, the borehole to the bottom should be smaller than 20 inches in diameter. This should be corrected.
3) The well detail at the end of the specifications calls out PVC SDR 17, 12-inch casing and PVC SDR 17, 12-inch slotted well screen. But Bid Item 1.7 calls out the PVC SDR 17 slotted scree
spacers, so this discrepancy needs to be resolved.
4) From what I can tell, you are planning a 12-inch steel casing for the top 300 feet of the well and the PVC well casing below that to a depth of 600 feet. In looking online, it appears that PVC
casing should only be installed to a maximum depth of 450 feet (see table below). You will need to provide proof that this casing can be used at these depths. Also, I need you to verify that th
marked "Well Casing " and meets ASTM 480-14 according to R655-4.
ASTM F480 WELL CASING PIPE | SDR-17
NOMINAL PIPE SIZE
(IN.)
PIPE OUTSIDE DIAMETER
(IN.)
PIPE INSIDE DIAMETER
(IN.)
MINIMUM WALL
(IN.)
MAXIMUM BURY DEPTH
(FT.)
SOCKET DEPTH
(IN.)
FEET PER
PALLET
4”4.500"3.970".265"450’6.0”580’
5”5.563"4.909".327"450’7.0”460’
6”6.625"5.845".390"450’6.5”400’
8”8.625"7.609".508"450’7.0”200’
10”10.750"9.486".632"450’7.5”240’
12”12.750"11.250".750"450’8.5”160’
Website reference: https://northernpipe.com/products/well-casing/
Let me know if you have any questions.
Also, it looks like you are still working with Deidre Beck on the PER, so that will also have to be concurred with before the well drilling can be approved.
Paul
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J. Paul Wright, P.E. | District Engineer | Southwest Utah District
435.986.2590 (office) | 435.680.0163 (cell) | 435.986.2595 (fax)
620 S 400 E #400, St. George, UT 84770
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7/11/24, 4:24 PM State of Utah Mail - Johnson Canyon Well #4 (WS006) File #15254 - Review Comments
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