DDW-2024-013211

SALT LAKE AREA OFFICE 
859 W South Jordan Pkwy – Ste 200 
South Jordan, Utah 84095 
  Phone: (801) 566‐5599 
www.hansenallenluce.com 

ENGINEERING EXCELLENCE SINCE 1974

Mr. David Kruse October 28, 2024
Source Monitoring Rules Manager
Utah Division of Drinking Water
P.O. Box 144830
Salt Lake City, Utah 84114-4830

RE: Summit County Service Area No. 3 (System #22105)
Quarterly Arsenic Report for the 3rd Quarter 2024, Greenfield Well (WS002)

Dear Mr. Kruse,

Summit County Service Area #3 (Service Area) provides drinking water to customers in the area
of Silver Creek Estates. The Service Area owns and operates two wells. The first of the Service
Area’s wells is the District Well (WS001). The District Well was drilled and equipped in 1963 and
produces about 180 gpm. Water from the District Well has an arsenic level of about 4 ppb. In
2003, the Service Area drilled the Greenfield Well (WS002), which produces up to about 200 gpm.
Water from the Greenfield Well has an arsenic level of about 22 to 23 ppb.

An operating permit for the Greenfield Well was approved by the Utah Division of Drinking Water
(DDW) on February 23, 2012, and revised via correspondence dated October 23, 2012. Because
the arsenic level in water from the Greenfield Well is above 10 ppb, the operating permit outlined
specific arsenic testing and reporting requirements associated with using the well. Additionally,
quarterly arsenic sampling is required at the Greenfield Well and at Silver Creek Estates Lot 278
(SS278). The sampling is typically performed monthly, and the results are averaged for each
quarter. A running annual average is computed using the averaged results. The running annual
average is to be maintained below the arsenic MCL of 10.0 ppb.

The Greenfield Well’s Operating Permit specifies that monitoring results are to be reported at the
conclusion of each quarter. This letter contains the report for the 3rd quarter of 2024.

ARSENIC SAMPLING RESULTS
Water samples were collected by Service Area personnel and submitted to Chemtech-Ford
Laboratories for analytical testing. The analytical results of the last four quarters are presented in
Table 1, Table 2, and Table 3 for SS278, WS001 and WS002, respectively.

10/28/2024
Mr. David Kruse
October 28, 2024
Page 2 of 6

TABLE 1
SS278 ARSENIC SAMPLING RESULTS AND SUMMARY

Quarter Month Arsenic Level
(ppb)
Quarterly Average
(ppb)
4th Quarter 2023
October -
9.7 November 13.5
December 5.9
1st Quarter 2024
January -
8.7 February 8.7
March -
2nd Quarter 2024
April 4.2
4.3 May 3.9
June 4.8
3rd Quarter 2024
July 4.3
6.4 August 5.6
September 9.3
Annual Average 7.3

From the data in Table 1, it may be observed that the annual average arsenic level is 7.3 ppb at
Lot 278, which is below the MCL of 10 ppb.

Mr. David Kruse
October 28, 2024
Page 3 of 6

TABLE 2
DISTRICT WELL (WS001) ARSENIC SAMPLING RESULTS AND SUMMARY

Quarter Month Arsenic Level
(ppb)
Quarterly Average
(ppb)
4th Quarter 2023
October -
4.3 November 4.6
December 4.0
1st Quarter 2024
January -
4.0 February 4.0
March -
2nd Quarter 2024
April 4.0
4.2 May 3.7
June 4.8
3rd Quarter 2024
July 4.0
4.1 August 4.2
September 4.0
Annual Average 4.1

Mr. David Kruse
October 28, 2024
Page 4 of 6

TABLE 3
GREENFIELD WELL (WS002) SAMPLING RESULTS AND SUMMARY

Quarter Month Arsenic Level
(ppb)
Quarterly Average
(ppb)
4th Quarter 2023
October -
22.2 November 21.9
December 22.6
1st Quarter 2024
January -
23.0 February 23.0
March -
2nd Quarter 2024
April 22.1
22.4 May 21.6
June 23.5
3rd Quarter 2024
July 21.9
21.4 August 21.5
September 20.9
Annual Average 22.3

Mr. David Kruse
October 28, 2024
Page 5 of 6

WATER USE DATA

The arsenic compliance plan described in the operating permit letter requires reporting of
Greenfield Well and District Well water use data. The reported water use is based on data
provided by the Service Area No. 3 SCADA system. Water use data for the Service Area’s two
water sources are summarized in Table 4. Following Table 4, Table 5 presents weekly production
data for the 3rd quarter.

TABLE 4
WATER USE DATA

Quarter Month Greenfield
Well (gallons)
District Well
(gallons)
Quarterly Total
(gallons)
4th Quarter
2023
October 101,847 1,741,686
4,152,242 November 902,259 257,748
December 0 1,148,702
1st Quarter
2024
January 0 1,770,709
6,978,412 February 0 2,426,668
March 0 2,781,035
2nd Quarter
2024
April 0 1,524,113
7,136,056 May 0 1,870,030
June 0 3,741,913
3rd Quarter
2024
July 0 4,209,906
9,068,465 August 0 2,769,109
September 0 2,089,450
Total 1,004,106 26,331,069 27,335,175

Mr. David Kruse
October 28, 2024
Page 6 of 6

TABLE 5
3RD QUARTER 2024 WEEKLY WATER USE DATA

Date Greenfield Well (gallons) District Well (gallons)
Jul 1 – 6 0 800,853
Jul 7 – 13 0 1,045,132
Jul 14 – 20 0 962,945
Jul 21 – 27 0 914,191
Jul 28 – Aug 3 0 813,587
Aug 4 – 10 0 821,105
Aug 11 – 17 0 581,363
Aug 18 – 24 0 570,090
Aug 25 – 31 0 469,749
Sep 1 – 7 0 483,326
Sep 8 – 14 0 439,269
Sep 15 – 21 0 431,299
Sep 22 – 28 0 589,146
Sep 29 – 30 0 146,410
Total 0 9,068,465

CONCLUSION
The available data show that the water delivered to water system customers complies with the
drinking water standards for arsenic. The annual running average at SS278 (7765 N. Silver Creek
Road) is 7.3 ppb.

Please contact me if you have any questions or concerns.

Sincerely,

HANSEN, ALLEN & LUCE, INC.

___________________________
Jason C. Biesinger, P.E.
Project Engineer