DDW-2025-003153

Pump Station Design Report Sand Hollow Well 7
February 2025

i

Table of Contents
Table of Contents ............................................................................................................................... i
Part I. Introduction ........................................................................................................................1
A. Location ............................................................................................................................................. 1
B. Existing Conditions ............................................................................................................................ 1
C. Water Quality .................................................................................................................................... 1
Part II. Sand Hollow Well 7 Pump Design ........................................................................................2
A. Proposed Design ............................................................................................................................... 2
B. Well Pump Design ............................................................................................................................. 2
Appendix A – Calculations and Pumping Tests
Appendix B – System Exhibit
Appendix C – Water Quality

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Part I. Introduction
A. Location
Sand Hollow Well 7 is located approximately 165 feet west and 165 feet south of the intersection
of Dixie Springs Road and 4010 West in Hurricane, Utah more specifically described as being North
234 feet and East 2143 feet from the West Quarter Corner of Section 23, Township 42 South, Range
14 West, Salt Lake Base and Meridian as shown in Figure 1.2 in Appendix B.
B. Existing Conditions
Sand Hollow Well 7 was recently drilled as a new well and an 18” well screen and casing were
installed this year. SRI #6 gravel silica sand gravel pack was installed between the well screen and
boring wall. A stepped drawdown pump test was completed on the well with a maximum yield
of 340 gpm and a drawdown of 561 feet (See Appendix A). Stabilized flow and constant rate pump
tests were also performed on the well which verified a stabilized drawdown of about 290 feet at
a constant rate of 290 gpm.
It is proposed to design the pump for 90% maximum yield of the well, or 305 gpm, with a
drawdown of 330 feet (see Appendix A). The pump will be equipped with a Variable Speed Drive
(VFD) and typically the well will be pumped at 85% (290 gpm) of the maximum yield but will have
the capability of pumping 305 gpm in an emergency. Pumping at 85% of the yield of the well will
reduce the RPM of the pump which will reduce wear due to sand. The drawdown for the well at
the 290 gpm design point was derived from the linear equation developed from the test pumping
of the well as y = 1.91x – 264 where x is the flow in gpm. The drawdown would be 290 feet at a
flow rate of 290 gpm.
Additionally, the well pump for Well 7 is being designed to pump against the head of the Sand
Hollow Ground Water Treatment Plant (SHGWTP) into the two-million-gallon tank (2 MG Tank)
on the east side of the reservoir. This report will present both flow scenarios that are being
considered and provide for the well pump design.
C. Water Quality
Water quality tests were performed on Well 7 by Chemtech-Ford Laboratories. Test results are
found to meet the minimum drinking water standards and are included in this report in Appendix
C.

Page | 2

Part II. Sand Hollow Well 7 Pump Design
A. Proposed Design
It is proposed to pump Well 7 against the head of the SHGWTP and the 2 MG Tank at an elevation
of 3,160’. The wellhead elevation for Well 7 is 3,008’, so the total static head is 152 feet. The
design considers losses through the SHGWTP at delivery of 10 MGD. At buildout, the Sand Hollow
Regional Pipeline (SHRP) will deliver 20 MGD to the Warner Valley Tank and will have an additional
head loss of 16 feet.
Well 7 is connected to the Sand Hollow Regional Pipeline through several sections of the well
collection piping system. From the well, water flows through approximately 2,023’ of 8” diameter
ductile iron pipe to the 20” DI well transmission line in the Sand Hollow Road right-of-way. The
20” diameter DI pipe runs for 930’ and then upsizes to a 30” DR11 HDPE pipe that runs for 2,700’
to the Sand Hollow Groundwater Treatment Plant(SHGWTP). After being treated it ultimately will
tie into the 36” SHRP that has a high point in the HGL system at elevation 3100’. The length to
the highpoint of the SHRP is approximately 11,800’ from the interconnection from the SHGWTP.
The proposed well design points for Well 7 are 305 gpm at 525 total dynamic head (TDH) with 330
feet of drawdown and 290 gpm at 485 TDH with 290 feet of drawdown in the well, including head
losses through the SHGWTP and transmission pipelines. Head loss calculations are shown in
Appendix A.
B. Well Pump Design
The pump has been designed with the following criteria:
Sand Hollow Well 7 – Design Point 1 – 306 gpm
Flow Rate: ...................................................... 305 gpm
Pump Station Elevation: .................................. 3008’
Sand Hollow Regional HGL Elevation: ............ 3160’
Total Static Head: ............................................ 152’
Water Surface at Drawdown (330’) ................ 2678’
Headloss Pipe and Treatment Plant ................ 66’
Total Dynamic Head: ....................................... 548’

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Sand Hollow Well 7 – Design Point 2 – 290 gpm
Flow Rate: ...................................................... 290 gpm
Pump Station Elevation: .................................. 3008’
Sand Hollow Regional HGL Elevation: ............ 3160’
Total Static Head: ............................................ 152’
Water Surface at Drawdown (290’) ................ 2718’
Headloss Pipe and Treatment Plant ................ 64’
Total Dynamic Head: ....................................... 506’

Appendix A – Well Reports and Approvals, Calculations and Pumping Tests
Well testing included a 20-hour Drawdown Test conducted on November 25 and 26, 2024, where
the well production (yield) was measured at decreasing water levels (drawdown) in the well.
Results of the test are shown in Figure 1. The well yield increased linearly from a drawdown of
135 feet to approximately 300 feet with a specific capacity of 0.53 gpm/ft of drawdown. At
approximately 300 feet, the specific capacity began to decrease, indicating the strata at that level
became less water bearing, or less porous. At approximately 400 feet, the specific capacity
dropped to 0.11 gpm/ft of drawdown where very little water entered the well at this level. Water
bearing strata are primarily above 300 feet.
Figure 1. Well Testing

Additional well tests on December 18 and 20, 2024, verified that the well can consistently produce
about 300 gpm with a drawdown of approximately 300 feet.

620 South 400 East Suite 400 • St. George, UT 84770 Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX Governor DEIDRE HENDERSON Lieutenant Governor
Department of Environmental Quality
Kimberly D. Shelley Executive Director DIVISION OF DRINKING WATER Nathan Lunstad, P.E. Director

April 19, 2024
Zachary Renstrom, Manager Washington County Water Conservancy District
533 E Waterworks Drive
St. George, UT 84770 Subject: Well Surface Seal Certification for the Washington County Water Conservancy District
– Sand Hollow, Sand Hollow Well 7 (WS020) System#27073, File #13422 Dear Zachary Renstrom:
On April 18, 2024, I witnessed the sealing procedure for the well referenced above as authorized by R309-515-6(5)(b). This letter is to certify that the well sealing procedure met the requirements
of Utah Administrative Code (UAC), Rule R309-515-6(6)(i), Well Sealing Techniques and
Requirements, and Rule R655-4-11.4, Surface Seals and Interval Seals. Well Background Well Name: Sand Hollow Well 7
Water Right Number (based on Start Card issued by Division of Water Rights): 81-1628 (a44965) Well Owner Name: Washington County Water Conservancy District Well Type: Public Drinking Water Well Washington County WCD – Sand Hollow
PWS Number (if applicable): UTAH27073
Water Source ID (if applicable): WS020 DDW File Number (if applicable): 13422 Consultant Name and Company (if applicable): Todd Gardner, Alpha Engineering
Well Location
County: Washington County Nearest Town: Hurricane, UT Location listed on the Start Card:
N 234’ E 2143’ from W4 Cor, S23 T42S R14W, SLB&M
Zachary Renstrom April 18, 2024

Local Health Department: Southwest Utah Public Health Department Street Address: About 4700 West and south of 3150 S Near Sand Hollow Reservoir in Hurricane, UT Latitude/Longitude: N 37.1202 deg W 113.39601 deg
Method Used to Determine Latitude & Longitude: Handheld GPS
Datum: NAD83 Well Head Elevation: 3,220’ Method Used to Determine Elevation: Handheld GPS
Well Driller
Name of Licensed Well Driller: Melvin Dale Gardner License Number: 492 Company Representative’s Name: Cameron Bliss Company Name: Gardner Bros Drilling
Mailing Address: PO Box 965, Enterprise, UT 84725
Phone Number: 435-878-5602 Responsible driller/operator onsite during well sealing: Cameron Bliss
Well Construction Well Drilling Method: Rotary drilled with air Casing Types Installed: Conductor casing, well drilled to a total depth of 600 feet with a 26 inch hole, no casing to total depth yet but anticipated to be an 18 inch casing.
Casing Diameter: 28”
Casing Length: 100’ Casing Material: Steel Annulus Size (between borehole and casing): 4 inches (36” borehole) Pitless Adapter: No
.
Well Sealing Description Description of the Well Sealing Process: The well was grouted using neat cement grout and pumped through a 2-inch tremie to the bottom of the borehole. The first truck had 10
cubic yard (CY) of grout and a second truck had to be ordered. The calculated neat line
volume was 10.33 CY. In the time it took for the second truck to show up, the grout had set up in the hopper, the hose, and tremie. They had to disconnect everything and pull the tremie they could (it broke at about 50 feet while pulling it). We measured the level of the grout and found it was at about 35 feet. We decided rather than waiting to do it another
day, we would use the second truck that was ordered and pour from the surface since we
had a 4 inch annular space and neat cement was being used which would reduce the risk of bridging. About another 4 CY of neat cement grout was used and it came to the surface. Grout Material: Neat Cement Grout Volume (in cu. yds.): ~14 Cu Yards, based on volume in truck. The calculated
required amount was about 10.33 CY.
Zachary Renstrom April 18, 2024

Grout Density (in lbs/gal): Two loads of 10 CY each. The first was 15.3 lbs/gal and the second was 15.1 lbs/gal (only about 4 CY of the second truck was pumped) Method of Placement: Positive displacement grout pump and pour from surface. Depth from Surface (in feet): 100’
Did Grout Come to the Surface? Yes
Length of tremie pipe: 100’ Names & Affiliations of Other Observers Cameron Bliss – Gardner Bros Drilling
Shay Hildebrandt – Gardner Bros Drilling
Steve Adams – Adams Concrete Pumping Dave Whaley – Washington County Water Conservancy District
Issues Observed during Well Sealing
See the description of the well grouting process above. This well seal certification is not a Plan Approval to construct a public drinking water well or an Operating Permit to use the well as a public drinking water source. Such approval may
only be granted by the Director of the Division of Drinking Water. A copy of this letter has been
sent to the Director of the Division of Drinking Water. If you have any questions regarding this certification, please contact me at [phone] or [e-mail].

Sincerely,
J. Paul Wright, P.E.
Southwest District Engineer

cc: Jeremy Roberts, Southwest Utah Public Health Dept., [e-mail] Nathan Moses, Division of Water Rights, [e-mail] Todd Gardner, P.E., Alpha Engineering, [e-mail] Gardner Bros Drilling, PO Box 965, Enterprise, UT 84725 Michael Newberry, Division of Drinking Water, [e-mail] Jim Goddard, Division of Water Rights, [e-mail]
J. Paul Wright, P.E., DEQ Southwest District Engineer, [e-mail] Zachary Renstrom, Washington County Water Conservancy District, [e-mail] 4-19-24 27073 WS020 surface seal certification.doc
DISCHARGE P
TIME T
INCHES OF
ORIFICE
PRESSURE GPM
PUMPING
LEVEL
STATIC
LEVEL
WATER
LEVEL
SPECIFIC
CAPAACITY PPM START STOP MLS REMARKS
11/25/2024 PRE SHIFT
10:00 AM START TEST PUMP
10:30 AM 580' 30.6 134.5 BUMB RPM 150/1100 RPM
11:30 AM 4" 210 134.4 5 CONTIUNE TEST
12:30 PM 6" 240 200.7 INCREASE TO 1150 RPM
1:30 PM 6" 240 201.1 5 CONTIUNE TEST
2:30 PM 8.5" 280 267.1 INCREASE TO 1300RPM
3:30 PM 8.5" 280 267.5 5 CONTIUNE TEST
4:30 PM 10" 310 343.5 INCREASE TO 1450RPM
5:30 PM 10" 310 343.3 5 CONTIUNE TEST
6:30 PM 12" 340 445.6 INCREASE TO 1600RPM
7:30 PM 12" 340 445.3 5 CONTIUNE TEST
8:30 PM 13" 353 561.4 START 24 HR TEST
9:30 PM 13" 353 561.4 5 CONTIUNE TEST
10:30 PM 12" 340 561.3 5 CONTIUNE TEST
11:30 PM 13" 353 561.6 5 CONTIUNE TEST
11/26/2024 561.4 5 CONTIUNE TEST
12:30 AM 12" 340 561.6 5 CONTIUNE TEST
1:30 AM 12" 340 561.6 5 CONTIUNE TEST
2:30 AM 12" 340 561.8 5 CONTIUNE TEST
3:30 AM 13" 353 561.4 5 CONTIUNE TEST
4:30 AM 13" 353 561.4 5 CONTIUNE TEST
5:30 AM 12" 340 561.6 5 CONTIUNE TEST
6:30 AM 13" 353 561.7 5 CONTIUNE TEST
7:30 AM 13" 353 561.3 5 CONTIUNE TEST
8:30 AM 12" 340 561.5 5 CONTIUNE TEST
9:30 AM 13 353 561.5 5 CONTIUNE TEST
10:30 AM 13 353 561.7 5 CONTIUNE TEST
11:30 AM 12 340 561.5 5 CONTIUNE TEST
12:30 AM 12 340 561.3 5 CONTIUNE TEST
1:30 PM 13 353 561.8 5 CONTIUNE TEST
2:30 AM 13 353 561.9 5 CONTIUNE TEST
3:30 PM 13 353 561.5 5 CONTIUNE TEST
4:30 AM 12 340 561.3 5 CONTIUNE TEST
5:30 PM 11 325 561.6 5 CONTIUNE TEST
6:30 AM 11 325 561.4 5 CONTIUNE TEST
7:30 PM 11 325 561.7 5 CONTIUNE TEST
8:30 AM 12 340 561.5 5 CONTIUNE TEST
9:30 PM 11 325 561.3 5 SHUTDOWN START RECOVERY
RECOVERY
9:30 PM 447.6
9:31 PM 398.1
9:32 PM 376.8
9:34 PM 354.2
9:36 PM 338.1
9:37 PM 313.8
9:38 PM 288.6
9:39 PM 387.3
9:40 PM 273.2
9:45 PM 260.2
9:50 PM 245.8
9:55 PM 197.6
10:00 PM 169.1
10:15 PM 147.6
10:30 PM 132
10:45 PM 110.4
11:00 PM 98
11:30 PM 91.3
12:00 AM 85.7
1:00 AM 77.9
2:00 AM 72.9
3:00 AM 69.2
4:00 AM 66.3
5:00 AM 61.3
6:00 AM 57.8
7:00 AM 54.9
TEST PUMPING REPORT
GARDNER BROTHERS DRILLING PO
BOX 965 ENTERPRISE,
UT 84725 435-878-5602
WELL OWNER: WCWCD SHEET NO.
LOCATION: SAND HOLLOW DATE: 10-23 & 24-2024
WELL NAME: WELL #7 OPERATOR BEN CRAM
CASING SIZE: 18 DEPTH 600 ENGINEER
TYPE OF TEST: PUMP SIZE DEPTH STATIC LEVEL
ORIFICE BOWL SIZE # STAGES DATUM
8:00 AM 52.2
9:00 AM 51.1
10:00 AM 49.3
11:00 AM 47.9
12:00 PM 46.7
1:00 PM 45.2
2:00 PM 43.7
3:00 PM 41.9
4:00 PM 40.7
5:00 PM 39.9
6:00 PM 38.3
7:00 PM 37.2
8:00 PM 35.9
9:00 PM 34.3
10:00 PM 33.1
11:00 PM 31.9
12:00 AM 30.8
12/18/2024
10:00 AM 580 30.6 PRE SHIFT FUEL
10:30 AM START STABLIZED @300 70
11:30 AM 305 275.1 5 CONTINUE STABILIZATION
12:30 PM 305 275.2 5 START 6 HR TEST
1:30 PM 305 275.5 5 CONTINUE TEST
2:30 PM 295 277.1 5 CONTNUE TEST
3:30 PM 285 278 5 BUMP UP TO 300GPM, BUMB TO 1186 RPM
4:30 PM 290 285.5 5 INCREASED TO 1200GPM CONTINUE
5:30 PM 290 292 5 INCREASE TO 1220RPM
6:30 PM 295 302.2 5 SHUT DOWN
12/20/2024 RPM
12:30 PM 30.6 PRE SHIFT MAINTENCE
1:00 PM 1037 9.5 305 580 218.8 START TEST @305GPM
1:20 PM 1057 8 239.9 INCREASE TO 1057 7PM
2:00 PM 1100 9 295 CONTINUE TEST
2:30 PM 1130 8 246.5 INCREASE TO 1130RPM
3:00 PM 1130 9 295 257.5 CONTINUE TEST
4:00 PM 1130 8 280 271.7 INCREASE TO 1160PRM 350GPM
5:00 PM 1160 8.5 287 296.5 CONTINUE TEST
6:00 PM 1200 9 295 291.8 INCREASE TO 1230 RPM
7:00 PM 1200 8 280 307.8 CONTINUE TEST
8:00 PM 1230 9 295 307.9 CONTINUE TEST
9:00 PM 1230 8.5 295 308.2 CONTINUE TEST
10:00 PM 1230 9 287 308.5 CONTINUE TEST
11:00 PM 1230 8 287 308.7 CONTINUE TEST
12:00 AM 1230 9 287 308.8 CONTINUE TEST
1:00 AM 1230 8.5 287 308.7 CONTINUE TEST
2:00 AM 1230 8.5 287 308.8 CONTINUE TEST
3:00 AM 1230 8.5 287 308.6 CONTINUE TEST
4:00 AM 1230 8.5 287 308.8 CONTINUE TEST
5:00 AM 1230 8 280 308.8 CONTINUE TEST
6:00 AM 1230 8 280 308.9 CONTINUE TEST
7:00 AM 1230 8 280 308.9 CONTINUE TEST
8:00 AM 1230 8 280 SHUT DOWN
8:30 AM
Sand Hollow Well 7 Pump Analysis - Design Point 1 - 305 gpm
Flow 305 GPM
Wellhead elevation 3,008 ft
2 MG Full Tank Elevation 3,160 ft
Headloss in Lakos 1040-L Sand Separator 13 ft
Estimated Headloss in Wellhouse Piping 10 ft
8" DI Pipe Inside Diameter 8.43 inchesPipe Length from Well 7 to 20" DI Pipe 2,023 ftHazen Williams 130
Wire to Water Pumping Efficiency 0.75
Headloss 3.2 ft
Design CummulativeFlow1,905 GPM Flow (gpm)Flow (gpm)20" DI Pipe Inside Diameter 20.75 inches 15 460 460
Pipe Length from 8" Pipe Tie-in to 30" HDPE Pipe 930 ft 12 305 765
Hazen Williams 130 13 475 1240
Headloss 0.5 ft 11 360 1600105352135Flow2,440 GPM
30" HDPE DR11 Pipe Inside Diameter 24.22 inches
Pipe Length from 30" HDPE Pipe to 36" DI Pipe 2,700 ft
Hazen Williams 130 Headloss 1.2 ft
Headloss through SGWTP 32.0 ft (10 MGD)
Flow 8,340 GPM (12 MGD)36" DI Cl 150 Pipe Inside Diameter 37.29 inchesPipe Length in 36" Pipe to High Point 11,800 ft
Hazen Williams 130
Headloss 6.1 ft
Total Headloss 66.0 ft
Flow Rate Static Head Drawdown Headloss Syst. Head Power
gpm ft ft ft ft HP 305 152 330 66.0 548 58
Sand Hollow Transmission Pipeline Flow
Well
Sand Hollow Well 7 Pump Analysis - Design Point 2 - 290 gpm
Flow 290 GPM
Wellhead elevation 3,008 ft
2 MG Full Tank Elevation 3,160 ft
Headloss in Lakos 1040-L Sand Separator 12 ft
Estimated Headloss in Wellhouse Piping 9 ft
8" DI Pipe Inside Diameter 8.43 inchesPipe Length from Well 7 to 20" DI Pipe 2,023 ftHazen Williams 130
Wire to Water Pumping Efficiency 0.75
Headloss 2.9 ft
Design CummulativeFlow1,890 GPM Flow (gpm)Flow (gpm)20" DI Pipe Inside Diameter 20.75 inches 15 460 460
Pipe Length from 8" Pipe Tie-in to 30" HDPE Pipe 930 ft 12 305 765
Hazen Williams 130 13 475 1240
Headloss 0.5 ft 11 360 1600105352135Flow2,425 GPM
30" HDPE DR11 Pipe Inside Diameter 24.22 inches
Pipe Length from 30" HDPE Pipe to 36" DI Pipe 2,700 ft
Hazen Williams 130 Headloss 1.2 ft
Headloss through SGWTP 32.0 ft (10 MGD)
Flow 8,340 GPM (12 MGD)36" DI Cl 150 Pipe Inside Diameter 37.29 inchesPipe Length in 36" Pipe to High Point 11,800 ft
Hazen Williams 130
Headloss 6.1 ft
Total Headloss 63.7 ft
Flow Rate Static Head Drawdown Headloss Syst. Head Power
gpm ft ft ft ft HP 290 152 290 63.7 506 51
Sand Hollow Transmission Pipeline Flow
Well

Appendix B – System Exhibit

Pipe Table

Junction Table