DWQ-2025-002295

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Central Davis Sewer District
Annual Biosolids Report 2024

Central Davis Sewer District is providing the included information in fulfillment of the
annual report requirement contained in permit UT-0020974. The report is divided
according to the EPA requirements found in 40 CFR Part 503.

Chemical Pollutant Analysis
During 2024, Central Davis Sewer District tracked the chemical quality of biosolids
produced by its wastewater treatment plant according to the method of treatment. Since
each treatment method is tracked separately, the results are reported individually below.

Anaerobic Digested Biosolids
Metals analysis stipulated in 40 CFR Part 503 was performed quarterly by Central
Davis Sewer District on anaerobic digested biosolids. Quarterly results, lab reports
and quality control charts have been calculated and are included in a separate
section. The summaries of the results are presented below:

(All values presented are in mg/KG on a dry weight basis)
Metal Annual Average Limit
Aluminum 60,725 None Arsenic 33 41
Cadmium 1 39 Chromium 20 None Copper 847 1,500 Lead 7 300 Mercury 0.3 17
Molybdenum 15 75 Nickel 11 420 Phosphorous 46,025 None
Selenium 7 100 Silver 2 None
Zinc 870 2,800
As can be seen, all results are within the acceptance limits.
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Compost Biosolids
Compost is sampled when the pile is ready for distribution and marketing. In 2024,
six samples were taken and analyzed. The yearly average is shown below. A
summary report, lab reports and quality charts are included in a separate section.

(All values presented are in mg/KG on a dry weight basis)
Metal Averages Limits
Aluminum 6,167 None
Arsenic 7.6 41
Cadmium 0.5 39
Chromium 8.8 None
Copper 269 1,500
Lead 9.9 300
Mercury 0.2 17
Molybdenum 3.4 75
Nickel 5.4 420
Phosphorus 10,962 None
Selenium 1.2 100
Silver 0.5 None
Zinc 309 2,800

As can be seen, all results are within the acceptance limits.

Biosolids Pathogen Reduction
During 2024, Central Davis Sewer District met the permit and regulatory requirement for
pathogen reduction in two separate ways. The two methods are discussed below. Since
one method produces Class B pathogen reduction, a discussion of the site restrictions is
presented at the end of this section.

Anaerobic Digestion
Anaerobic digestion stipulates both time and temperature requirements be met
while the biosolids are in the digester. The permit requires that the temperature
remain above 35o C for at least 15 days. During 2024, the digester monthly
average temperatures remained above 35o C for the entire year. A history of the
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digester temperatures is given in this report. Calculation sheets determining the
duration biosolids remained in the digester are also included. The shortest duration
for biosolids remaining in the primary digesters was 15.4 days.

Composting Class A – Aerated Static Pile (ASP)
ASP composting requirements stipulate that Class A compost produced under the
windrow method remain above 55o C. for 3 days or longer. At the end of the
compost period, the compost must have less than either 1000 MPN/gram fecal
coliforms or 3 MPN/4 grams for Salmonella. For composting, the District takes
two or more weeks building a pile. At the end of the pile-building period the pile is
generally large enough to maintain temperature and moisture. After one-week,
active composting begins, and temperatures are recorded. All piles are capped
with finished compost to maintain temperatures and to reduce odors. Each pile is
then monitored for 15 days or longer and daily temperatures are recorded. Copies
of the composting log sheets are included. During 2024, all ASP compost complied
with the regulatory requirements.

Composting Class B
No Class B compost was produced in 2024.

Site Restrictions
The land on which biosolids are applied is owned by the District and is used to
produce feed crops and turf grass. Harvesting of all feed crops occurs at least 30
days after the application of the last load of biosolids. Turf grass is not harvested
until at least one year after application. In 2024 no turf grass was harvested
although there are two fields with aged turf grass available. This land is farmed
and separated from the public and is considered to have a low potential for public
contact. The entire site is fenced with security fencing and warning signs are
posted to inform the public that the area is a designated biosolids application site.
The District has very few problems with unauthorized entry to the site.

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Vector Attraction Reduction Requirement
Central Davis Sewer District evaluates VAR methods separately for the two biosolids
production streams which operate at the plant. These two production streams are
Trickling Filter - Anaerobic Digested Biosolids and Oxidation Ditch - Composted Biosolids.

Trickling Filter - Anaerobic Biosolids
The District meets the VAR requirements for biosolids produced through anaerobic
digestion by complying with the 38% or greater volatile solids reduction. All
quarters exceeded the 38% requirement, and the annual average volatile solids
reduction was 56%.

Oxidation Ditch - Compost
The composting process VAR requirements are met by the biosolids being in an
aerobic process for at least 14 days and during that time the compost maintains a
temperature above 40oC with the temperature being above 50oC. This requirement
was met for all piles and documentation of the temperatures can be found on the
log sheets included in the pathogen reduction section. Final curing for the compost
lasts anywhere from 45 days to 120 days depending on moisture reduction and
when screening takes place.

Landfilling of Biosolids
At the beginning of 2015, the District lost one of its major wood waste suppliers. This loss
of wood waste forced the District to rely on green waste to continue composting.
Composting with green waste is viable during the spring, summer and fall but presented
problems in the winter since green waste compost has a higher odor potential. The loss
of wood waste has allowed the District to see if there are still odors when no active
compost piles remain. The District did not receive any odor complaints about the
biosolids when landfilling during 2024. There is a significant cost increase with
landfilling, approximately $210,129 in tipping fees alone, but the lack of complaints is
viewed as a major benefit. In addition, this is the first year where the District has signed
a 3-year contract with the landfill and due to the contract, the District is obligated to take
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a steady amount of biosolids to the landfill which will in return has produce significantly
less compost this year.

Biosolids Production Rates
Central Davis Sewer District produced composted, anaerobic digested and landfilled
biosolids. The District maintained separate records for production of each type. The 2024
quantities are presented separately below.

Anaerobic Digested Biosolids Production
During 2024, the District tracked the number of loads of anaerobic biosolids
applied to agricultural land and composted. A total of 308 loads were applied at an
average of about 16.3% solids. This represents 278 English tons or 253 metric
tons of dry biosolids. While this represents about one-third of the wastewater flows
it only represents about 25% of the biosolids production. This is most likely due to
additional volatile solids destruction in the digesters.

Oxidation Ditch Biosolids Production
In 2024, the District also tracked the weight of aerobic biosolids incorporated into
compost. 450 Mixer truckloads of 462,576 lbs. and Dump truckloads of 1,333,448
lbs. were hauled to the composting area at an average of 18.4% solids.
This represents a total of 898 English tons or 816 metric tons of dry biosolids, sent
to composting.

Trickling Filter Biosolids Production
In 2024, the District also tracked the weight of anaerobic biosolids incorporated
into compost. 450 Mixer truckloads of 151,800 lbs. were hauled to the composting
area at an average of 16.5% solids. This represents a total of 76 English tons or
69 metric tons of dry biosolids, sent to composting.

Final Compost Production
764 metric tons of 2023 compost was sold in 2024. A total of 892 metric tons of
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compost were produced in 2024. All the 2024 compost remains to be screened
and/or marketed.

Land Filled Production
The District hauled 3573 wet English tons of biosolids to the Wasatch Regional
Landfill. This represents 657 English tons or 598 metric tons of dry biosolids that
were landfilled.

Total Biosolids Production
Biosolids or biosolids derived material produced in 2024 were 1,743 Metric tons.
Of this total, 598 metric tons were landfilled, and the remainder was or will be
beneficially reused on the District’s farm or sold as compost to the general public.

Application Zones
Records for land application to fields or zones are included in this report. The report
only includes information on zones where land application took place in 2024. Zone 2
has about 57 percent of the allowed loads applied, and this zone will continue to be
applied to in 2025.

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CDSD Anaerobic Biosolids Chemical Quality - 2024
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphorus Selenium Silver Zinc
Date Type ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
2/5/2024 AN 62,100 34.5 0.62 16.6 780 4.4 0.173 15.8 11.3 56,800 1.1875 2 732
4/22/2024 AN 59,000 31.8 0.86 23.4 754 9.03 0.34 12.7 12.2 40,700 9.69 1.85 836
7/15/2024 AN 60,600 33.5 0.75 22.3 842 6.45 0.27 15.8 11.9 44,700 8.87 1.72 915
11/25/2024 AN 61,200 31.1 0.86 17.00 1010 6.72 0.451 17.6 7.24 41,900 6.95 1.7 995
Minimum 59,000 31 1 17 754 4 0.2 13 7 40,700 1 2 732
Average 60,725 33 1 20 847 7 0.3 15 11 46,025 7 2 870
Maximum 62,100 35 1 23 1,010 9 0.5 18 12 56,800 10 2 995
TKN
Ammonia
as N
Nitrate+N
itrite-
Total
Total
Solids
Date ppm ppm ppm ppm
2/23/2024 7,430 614 0.25 17.1
4/22/2024 7,640 860 1.90 16.5
7/15/2024 8,360 620 0.25 16.9
11/25/2024 6,240 664 1.0 15.7
Minimum 6,240 614 0.25 16
Average 7,418 690 0.9 17
Maximum 8,360 860 1.9 17
Total Year Values
*Notes: All ND values are taken as 0.25*MDL and shown as blue
https://d.docs.live.net/98ae734ac05258f0/BIOSOLIDS Files/Biosolids - Consolidated Data/Biosolids Report - Calendar Year 2024/4. Anaerobic Biosolids Chemical Quality/Anaerobic
Biosolids Metals Summary 2024
1/16/2025
Central Davis Sewer District
Anaerobic Biosolids - Historic Table
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphorus Selenium Silver Zinc ppm
Date Type ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
11/7/1988 AN 1.8 1.8 38.2 372.7 35.2 3.1 23.5 557
12/8/1988 AN ** 2.5 16.4 237.7 24.6 1.7 13.1 341
12/22/1988 AN 3.9 2.3 22.7 175.1 18.2 0.9 15.9 271
1/9/1989 AN 3.1 2.2 19.3 235.1 22.8 0.9 15.8 581
2/10/1989 AN ** 2.0 21.9 260.1 32.2 4.9 11.1 430
3/5/1989 AN ** 2.6 19.4 248.0 31.3 10.3 10.8 374
4/14/1989 AN ** 2.0 17.9 260.9 37.3 3.1 10.2 412
4/24/1989 AN ** 2.2 21.9 320.2 35.4 4.6 11.8 490
5/29/1989 AN ** 2.4 20.8 346.8 ** 4.0 13.5 574
7/8/1989 AN 8.8 2.1 25.9 325.8 62.3 2.4 18.5 486
8/7/1989 AN 4.0 2.0 27.6 394.4 60.0 3.4 18.1 525
8/25/1989 AN 2.6 2.4 23.5 361.9 47.9 3.6 9.9 528
3/5/1990 AN ** 1.8 22.1 306.0 34.9 1.9 8.5 401
4/2/1990 AN ** 1.8 31.9 359.4 38.0 3.1 9.9 469
5/31/1990 AN 3.7 2.4 19.7 337.3 41.3 2.7 11.8 485
8/30/1990 AN 4.9 3.0 21.0 388.0 35.0 3.2 17.0 594
3/13/1991 AN 1.7 34.4 277.4 34.4 ** ** 456
8/8/1991 AN 18.3 3.1 20.0 399.5 38.6 3.5 18.6 654
9/9/1991 AN 7.6 2.0 23.3 400.0 30.2 ** 13.8 600
1/23/1992 AN 4.0 2.3 15.0 333.6 31.3 ** 13.4 541
2/24/1992 AN 2.1 2.0 16.2 368.6 ** ** 22.6 468
3/1/1992 AN 2.3 1.1 7.7 318.0 ** ** 13.0
3/27/1992 A 1.7 2.1 9.9 215.0 19.2 ** 12.8 255
4/16/1992 AN 3.1 1.0 11.0 394.0 ** ** ** 608
5/22/1992 A ** 1.2 9.4 151.0 18.7 ** 7.7 208
6/15/1992 AN 8.7 2.3 12.1 ** 19.6 ** 10.9 514
10/27/1992 A ** ** 29.1 305.0 36.2 ** 1.1 19.7 ** 475
12/28/1992 AN 1.2 2.3 19.5 488.0 46.3 2.3 7.9 13.5 23.5 515
12/28/1992 A 12.3 1.2 8.6 206.0 16.1 4.9 4.6 8.1 17.7 213
1/29/1993 A 14.2 1.7 13.9 239.0 ** 3.1 15.4 12.5 216
3/22/1993 A 2.4 ** ** 278.0 1.8 3.5 ** 2.1 364
4/23/1993 AN 2.5 7.5 28.0 385.0 3.3 3.5 22.7 16.2 1,110
5/28/1993 A 2.4 1.5 7.5 315.0 101.0 2.1 7.7 12.5 7.5
5/31/1993 AN 2.4 2.0 9.0 410.0 108.0 0.5 11.9 16.0 7.5 765
6/2/1993 A 2.4 1.7 7.5 300.0 76.0 1.6 7.7 13.5 7.5
6/2/1993 AN ** 2.5 13.5 422.0 125.0 6.4 12.6 16.5 7.5
6/21/1993 AN 2.4 2.5 14.0 623.0 39.0 4.4 12.7 15.5 7.5 583
6/21/1993 A 2.4 1.4 6.5 263.0 20.5 3.3 4.3 11.0 7.5 258
7/29/1993 A 2.4 2.2 12.5 334.0 24.5 0.2 7.1 14.0 7.5 325
7/29/1993 AN 2.4 2.5 15.6 369.0 34.5 0.5 9.6 15.0 7.5 603
8/26/1993 A 2.4 1.8 16.5 347.0 21.5 2.1 7.3 15.5 7.5 244
8/26/1993 AN 2.4 2.8 23.8 410.0 35.0 4.3 9.4 16.5 7.5 588
9/23/1993 A 5.5 2.8 14.6 364.0 24.0 4.2 6.0 16.0 5.4 370
9/23/1993 AN 3.6 3.4 20.0 439.0 34.4 7.4 6.8 17.1 5.4 664
10/25/1993 AN 15.0 4.4 23.1 383.0 35.1 2.9 12.0 14.0 20.3 479
10/25/1993 A 2.4 1.8 14.0 307.0 23.2 1.7 9.0 12.0 7.5 328
11/29/1993 AN 2.4 2.5 14.0 353.0 30.0 0.3 6.5 14.0 7.8 414
11/29/1993 A 2.4 1.7 9.8 286.0 15.0 0.1 11.0 14.0 7.8 256
12/20/1993 AN 2.4 3.0 24.5 388.5 49.0 0.3 10.5 14.6 13.2 563
12/20/1993 A 2.4 1.9 14.3 299.0 10.0 0.1 2.5 12.1 2.5 272
1/17/1994 AN 8.2 2.6 27.0 420.0 35.0 0.1 12.1 17.2 2.5 542
1/17/1994 A 6.4 2.0 15.8 314.0 18.5 0.1 9.2 13.4 5.5 288
2/14/1994 AN 12.9 6.0 22.7 392.0 27.4 2.9 6.4 14.1 3.4 538
2/14/1994 A 8.6 2.9 13.1 270.0 15.8 0.1 4.0 11.3 0.7 247
3/25/1994 AN 15.3 7.4 21.1 390.0 32.0 5.6 4.0 11.4 11.9 531
3/25/1994 A 1.5 2.5 9.9 295.0 22.6 1.8 4.0 6.8 2.5 287
4/19/1994 AN 5.0 5.8 21.4 406.0 33.3 2.0 3.5 12.5 3.5 536
4/19/1994 A 4.4 3.4 13.7 318.0 15.2 7.9 3.5 11.2 3.5 285
5/17/1994 AN 7.0 8.3 34.9 634.0 83.9 5.5 7.0 23.5 7.0 882
5/17/1994 A 0.7 1.8 14.6 364.0 28.1 2.5 7.0 12.1 7.0 298
6/28/1994 AN 5.5 2.2 22.0 465.0 33.0 4.4 6.5 16.7 10.0 463
6/28/1994 A 5.5 0.5 12.0 376.0 25.0 1.0 7.4 12.6 18.0 242
7/19/1994 AN 3.4 1.7 17.5 463.0 30.5 4.4 7.7 15.9 7.1 608
7/19/1994 A 6.4 1.4 11.8 405.0 17.3 2.3 5.6 16.9 2.8 374
8/16/1994 AN 4.6 2.3 24.3 458.0 29.3 9.4 6.9 18.9 2.8 613
8/16/1994 A 4.2 3.0 14.2 381.0 17.5 3.9 5.6 17.0 3.0 330
9/23/1994 AN 6.6 2.5 15.6 445.0 29.3 3.0 8.2 12.7 1.0 65
9/23/1994 A 6.7 1.4 8.3 296.0 14.5 1.2 5.5 11.2 1.0 274
10/18/1994 A 5.8 1.1 12.8 322.0 18.8 1.4 6.2 14.4 4.1 327
10/18/1994 AN 7.5 2.3 21.3 493.0 35.4 2.8 9.2 16.1 1.0 428
11/22/1994 A 3.1 1.4 11.5 308.0 16.5 1.2 6.5 12.7 0.3 269
11/22/1994 AN 8.7 2.6 24.9 523.7 35.9 2.9 10.1 17.9 0.5 635
12/20/1994 A 2.8 1.0 24.3 281.0 17.8 2.0 5.6 19.4 4.9 235
12/20/1994 AN 6.1 1.5 18.5 361.0 28.4 2.0 7.1 23.9 2.0 420
1/17/1995 A 4.6 1.4 14.8 286.0 17.2 0.8 6.1 15.7 4.9 252
1/17/1995 AN 6.3 2.8 27.6 465.0 38.3 2.5 10.1 20.2 3.3 571
2/14/1995 A 6.5 1.5 11.6 226.0 16.4 1.3 5.8 12.5 2.4 235
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Central Davis Sewer District
Anaerobic Biosolids - Historic Table
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphorus Selenium Silver Zinc ppm
Date Type ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
2/14/1995 AN 11.9 3.7 25.6 394.0 43.0 2.4 8.7 19.8 5.0 574
3/21/1995 A 12.0 3.0 15.1 300.0 33.0 1.3 5.5 15.4 1.5 281
3/21/1995 AN 12.0 4.7 28.0 406.0 52.0 2.3 8.2 19.7 2.5 544
4/18/1995 A 6.8 1.2 13.4 270.0 13.4 1.6 5.0 13.1 0.3 277
4/18/1995 AN 5.3 2.5 24.7 397.0 28.4 3.7 7.6 20.1 0.3 514
5/16/1995 A 9.1 1.1 15.5 192.0 17.7 0.8 6.6 13.6 2.7 277
6/19/1995 AN 2.0 1.0 17.0 330.0 29.0 0.0 4.0 15.0 4.0 320
7/19/1995 A 4.5 1.1 12.3 184.0 6.0 0.7 4.9 11.6 0.4 223
8/29/1995 AN 2.0 2.0 14.5 219.4 18.5 1.2 6.7 16.1 2.0 314
9/17/1995 A 6.2 2.0 18.8 447.0 26.7 0.3 7.7 17.5 6.2 405
10/24/1995 AN 2.0 2.0 20.0 446.0 44.0 3.9 6.0 16.0 4.0 516
11/20/1995 A 6.5 1.5 16.3 357.0 38.6 1.8 3.5 19.5 13.0 314
12/17/1995 AN 10.0 2.5 17.0 416.0 40.0 3.4 10.0 20.0 20.0 550
1/16/1996 A 14.0 2.0 10.0 294.0 3.5 0.3 7.0 14.0 14.0 287
2/12/1996 AN 19.8 1.5 11.5 208.0 67.8 9.7 3.1 8.7 3.2 291
3/19/1996 A 20.0 1.0 20.0 273.0 18.0 2.0 5.0 17.0 6.5 285
4/16/1996 AN 13.0 1.8 19.0 396.0 27.0 3.3 5.0 15.0 13.0 512
5/21/1996 A 4.0 1.3 12.5 290.0 18.0 1.3 6.0 13.0 5.5 225
6/21/1996 AN 3.0 2.3 18.4 429.0 31.0 3.7 6.0 17.0 4.0 532
7/23/1996 A 5.0 1.1 12.0 350.0 25.0 1.0 6.0 12.0 10.0 298
8/20/1996 AN 3.0 1.8 14.0 386.0 23.0 3.0 6.0 11.0 4.0 400
9/24/1996 A 2.0 1.4 11.5 428.0 16.0 1.7 7.0 13.0 15.0 306
10/22/1996 AN 6.0 1.8 16.5 402.0 21.0 2.0 7.0 13.0 3.5 384
11/26/1996 A 5.0 1.0 10.2 273.0 10.0 1.3 4.0 10.1 2.5 190
12/19/1996 AN 2.4 1.5 15.9 411.0 32.0 6.0 2.1 14.4 3.5 422
1/21/1997 A 2.8 0.8 8.6 295.0 12.0 0.3 4.0 12.0 3.8 168
2/10/1997 AN 2.5 1.4 13.4 398.0 25.0 1.6 6.0 10.3 3.5 402
3/17/1997 A 3.5 1.1 12.2 374.0 16.0 0.5 5.0 12.0 4.6 255
4/21/1997 AN 4.0 2.2 19.0 626.0 30.0 2.7 10.0 15.0 3.0 592
5/19/1997 A 3.0 0.9 11.0 395.0 14.0 1.3 7.0 11.0 4.0 278
6/27/1997 AN 3.0 1.4 15.1 405.0 27.0 3.5 5.0 16.0 4.0 451
7/22/1997 A 4.0 1.0 11.2 383.0 15.0 2.9 5.9 12.7 2.0 288
8/26/1997 AN 3.0 1.8 16.7 587.0 29.0 3.1 7.0 14.0 4.0 563
9/23/1997 A 2.9 1.1 12.2 473.0 22.0 4.2 6.0 11.0 3.9 306
10/21/1997 AN 3.0 1.1 12.4 333.0 14.0 0.9 6.0 9.0 4.0 312
11/28/1997 A 3.0 0.5 9.0 446.0 15.0 2.0 5.0 10.0 3.8 240
12/19/1997 AN 6.0 2.2 24.0 750.0 36.0 4.0 11.0 17.4 3.5 632
1/28/1998 AN 5.0 0.5 10.6 290.0 14.0 1.9 4.0 9.3 5.7 186
2/10/1998 A 8,860.0 5.2 1.4 20.0 477.0 27.0 5.3 8.0 13.0 7.0 7.7 454
3/31/1998 AN 16,600.0 11.0 1.1 17.8 429.0 20.0 2.5 5.0 12.0 11.0 10.2 422
4/21/1998 A 9,930.0 8.0 0.4 11.7 334.0 15.0 2.7 4.6 11.0 8.0 6.4 219
5/20/1998 AN 20,100.0 10.0 0.8 23.4 465.0 26.0 3.6 5.0 14.0 10.0 9.7 452
6/30/1998 A 13,000.0 9.0 1.0 16.5 376.0 12.0 3.2 6.0 13.0 9.0 6.6 290
7/31/1998 AN 22,000.0 10.0 2.0 20.0 630.0 25.0 3.0 12.0 15.0 10.0 15.0 701
8/14/1998 A 12,900.0 10.0 1.2 14.6 534.0 21.0 1.4 8.0 11.0 10.0 10.6 355
9/22/1998 AN 19,200.0 10.0 1.7 16.2 578.0 16.0 5.2 10.0 13.0 10.0 12.2 605
10/26/1998 A 11,800.0 11.0 0.5 13.5 471.0 11.0 ** 7.0 11.0 11.0 8.6 280
11/20/1998 AN 17,300.0 10.0 1.0 16.7 470.0 17.0 ** 8.0 12.0 10.0 9.1 510
12/8/1998 A 10,400.0 14.0 0.7 12.8 384.0 7.0 8.2 6.0 11.0 14.0 7.8 234
1/18/1999 AN 19,000.0 11.0 14.5 23.0 460.0 22.0 1.0 7.0 14.0 11.0 8.9 510
2/12/1999 A 9,800.0 5.0 0.6 12.0 350.0 11.0 0.1 6.0 11.0 5.0 7.0 210
3/2/1999 AN 9,500.0 10.0 0.7 11.0 240.0 16.0 5.0 4.0 7.0 10.0 4.0 250
5/25/1999 AN 21,000.0 10.0 1.4 21.0 560.0 27.0 5.9 6.0 13.0 10.0 9.0 560
7/10/1999 AN 18,000.0 10.0 1.0 20.0 540.0 18.0 3.8 6.0 14.0 10.0 9.0 520
9/11/1999 AN 16,000.0 10.0 1.4 15.2 500.0 16.0 5.6 6.0 10.0 10.0 8.5 490
12/13/1999 AN 22,000.0 9.0 1.6 18.0 760.0 21.0 8.6 9.0 15.0 9.0 16.0 620
2/14/2000 AN 27,000.0 5.0 2.0 21.7 790.0 27.0 4.0 9.0 14.0 5.0 19.0 700
4/10/2000 AN 22,000.0 5.0 1.7 21.6 700.0 23.0 3.5 7.0 12.0 5.0 16.0 580
6/27/2000 AN 19,000.0 5.0 1.4 19.0 590.0 18.0 3.1 11.0 11.0 5.0 21.0 570
8/21/2000 AN 26,000.0 4.5 2.0 22.0 860.0 27.0 3.1 15.0 15.0 4.5 17.0 800
10/16/2000 AN 22,000.0 15.0 2.0 16.0 710.0 21.0 5.0 11.0 11.0 5.0 19.0 620
1/22/2001 AN 22,000.0 5.0 1.4 17.0 700.0 23.0 3.1 10.0 11.0 5.0 5.0 630
1/22/2001 A 11,000.0 5.0 0.3 9.3 440.0 3.5 1.4 5.0 9.0 5.0 5.0 420
3/7/2001 AN 24,000.0 10.0 1.5 18.0 680.0 24.0 3.5 9.0 12.0 10.0 11.0 620
5/1/2001 AN 24,000.0 5.0 1.7 20.0 690.0 24.0 3.8 7.0 13.0 5.0 12.0 650
7/3/2001 AN 19,000.0 0.5 1.1 18.0 560.0 16.0 4.2 11.0 11.0 0.5 13.0 600
12/18/2001 AN 24,000.0 12.0 0.9 17.0 720.0 15.0 3.9 11.0 14.0 5.5 630
3/12/2002 AN 33,000.0 8.0 1.7 26.0 890.0 26.0 3.2 12.0 17.0 29,000 15.0 16.0 880
5/14/2002 AN 22,000.0 5.0 1.7 20.0 600.0 28.0 5.2 8.0 12.0 23,000 5.0 12.0 640
7/1/2002 AN 22,000.0 5.0 1.3 20.0 620.0 16.0 4.0 8.0 12.0 22,000 13.0 9.8 600
9/13/2002 AN 29,000.0 9.0 1.9 20.0 870.0 21.0 4.4 12.0 14.0 26,000 9.0 13.0 600
11/25/2002 A 9,100.0 4.0 0.6 7.0 340.0 7.0 0.3 5.0 6.0 13,000 5.0 4.2 230
12/31/2002 AN 17,000.0 8.5 0.4 10.0 580.0 6.0 8.0 8.0 10.0 25,000 8.5 6.7 420
2/22/2003 A 12,000 5 0.6 8 430 3.5 2 5 8 21,000 5 6.1 310
2/22/2003 AN 21,000 10 1.5 18 800 18 4 12 12 25,000 10 12 680
4/14/2003 AN 28,000 5 1.8 18 760 28 4.3 13 12 25,000 5 16 630
7/17/2003 AN 28,000 5 2 18 840 27 4.2 13 16 27,000 5 31 660
10/6/2003 AN 29,000 12 1.9 16 860 28 3.8 16 15 24,000 5 29 730
Page 4
Central Davis Sewer District
Anaerobic Biosolids - Historic Table
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphorus Selenium Silver Zinc ppm
Date Type ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
1/28/2004 A 14,000 5 0.25 11 520 11 1.3 7 12 22,000 5 19 850
1/28/2004 AN 31,000 2 1.3 18 780 26 3.6 13 13 26,000 2 38 720
4/13/2004 AN 26,000 5 1.4 19 710 24 3.2 9 15 24,000 5 31 620
7/23/2004 AN 28,000 5 1.6 21 920 22 3.2 12 18 26,000 5 32 780
10/7/2004 AN 19,000 5 0.8 16 530 17 2.9 8 16 14,000 5 17 490
1/11/2005 AN 21,000 5 1 15 770 13 3 4 13 20,000 5 33 690
4/12/2005 AN 18,000 5.5 0.7 16 580 19 4.1 1.1 13 15,000 5.5 20 490
7/15/2005 AN 16,100 5 1.9 17.9 606 14 2.7 1 16 15,900 5 18 577
10/5/2005 AN 16,000 18 1.5 15 840 14 2.7 7 14 19,000 5 16 700
1/10/2006 AN 19,000 5 1.4 18 1000 13 2.7 11 15 23,000 5 29 800
4/3/2006 AN 16,100 5 1.5 14.7 843 19.9 1.22 8.89 10.3 20,000 5 22 626
7/14/2006 AN 15,000 14 1 18 900 21 2 10 14 20,000 5 24 660
10/6/2006 AN 13,000 13 0.8 15 800 17 2.2 10 11 15,000 5 16 600
1/5/2007 AN 15,500 15 1 17.2 970 15 3.7 11 11.4 1,660 5 25.6 706
4/4/2007 AN 15,000 13 1 19 980 20 1.3 12 13 26,000 6 19 800
7/6/2007 AN 14,000 16 1 17 1080 17 2 13 13 22,000 5 21 800
10/1/2007 AN 11,300 17 1.2 15.1 1090 19 2.5 15 6.7 18,600 7 13.7 873
1/8/2008 AN 11,500 14 1 14.6 913 15.2 0.12 11 11 18,400 2.5 20.3 715
4/4/2008 AN 13,500 15.7 1 17 940 75 2.3 12 13 24,800 6.6 16 800
7/8/2008 AN 12,700 15 1.2 16.8 978 25 2.5 11.7 13.2 23,200 0.25 14.7 543
10/21/2008 AN 12,000 18 1.1 15.6 1200 27 0.18 13 12.5 24,000 2.5 15.5 880
1/5/2009 AN 11,400 25 1.2 29 1280 20 1.6 13 11.2 23,500 2.5 16.4 826
4/6/2009 AN 11,500 16 1.1 18.6 1150 18.3 1.7 11.4 15.5 25,900 8.2 14.6 859
7/6/2009 AN 12,100 18 1.1 18.3 1260 21.4 2 11.6 14.3 23,500 9.4 14.4 901
10/12/2009 AN 11,100 20 1.2 16 1400 16.7 2 13 12.6 24,000 5.6 12.4 987
1/12/2010 AN 10,300 18.6 1.03 13.5 1200 13.7 1.75 12.3 10.9 24,000 6.21 13.3 884
4/8/2010 AN 11,200 15.9 1.07 19.1 998 15.7 3.03 12.3 12.9 11,200 12.2 12.2 913
7/16/2010 AN 11,700 35.5 2.29 22.1 1120 34.8 0.45 15.7 15.6 25,600 21.5 21.5 983
10/4/2010 AN 10,200 20.1 1.06 14.3 1240 15.5 1.5 12.8 11.6 20,800 8.02 12 922
1/14/2011 AN 10,700 19.5 1.02 14.7 1270 13.2 1.31 13.2 10.4 22,100 5.16 11.7 852
4/4/2011 AN 9,560 17.4 0.86 15.2 850 16.2 2.2 10.7 12 19,800 6.89 9.63 733
7/14/2011 AN 3,410 13.6 0.49 6.78 425 10.6 3.1 5.0 5.6 8,460 11.8 4.51 345
10/6/2011 AN 7,430 21.7 1.05 14.3 1250 16.7 2.04 10.9 12.6 17,900 8.45 8.69 812
1/9/2012 AN 4,210 14.6 0.674 6.75 771 9.4 1.15 8.47 9.24 15,100 8.17 5.61 570
4/9/2012 AN 4,710 14.7 0.811 10.6 807 11 1.77 9.03 9.36 16,400 8.35 6.55 632
7/6/2012 AN 5,000 16.7 0.88 13.3 948 13.3 1.64 10.2 9.83 17,100 6.59 7.46 744
10/1/2012 AN 4,870 21.7 0.501 11.7 1210 16.6 2.16 12.5 10 18,800 8.76 4.08 794
1/7/2013 AN 9,320 20.3 0.857 10.3 1050 12.1 1.72 11.8 9.06 21,000 8.58 5.95 691
4/8/2013 AN 7,460 23.6 0.884 15.6 1090 13.4 0.77 13.2 12.8 24,500 10.8 6.76 827
7/8/2013 AN 3,790 14.6 0.632 10.7 721 11.9 1.98 8.39 8.12 12,800 7.28 5.03 560
10/4/2013 AN 5,030 21 1.14 15.7 1340 16.8 1.91 14.6 13.7 18,500 9.99 7.35 995
1/6/2014 AN 4,200 14.7 0.816 10.5 828 10.4 0.79 10.1 9.31 12,000 7.1 4.8 541
4/4/2014 AN 4,910 13.2 1.12 14 1110 13.4 1.81 13.2 13.3 19,200 8.87 7.14 105
7/7/2014 AN 5,100 16.7 0.788 14.3 1170 15.4 1.99 12.8 12.7 19,600 10.7 6.14 939
10/8/2014 AN 4,070 15.1 0.585 11.6 908 9.21 0.9 3.11 9.48 13,300 3.54 4.67 716
1/7/2015 AN 5,270 18 0.779 14.3 1220 13.2 1.88 15.9 12.3 18,400 3.9 5.2 906
4/3/2015 AN 4,880 13.4 1.05 13.5 1090 13.7 0.34 14 12 20,500 6.33 3.83 792
7/13/2015 AN 5,240 15.5 0.785 16.2 1020 14.2 1.45 11.7 12.1 16,100 2.46 2.25 868
10/9/2015 AN 4,380 13.4 0.7 11.4 974 11.3 1.5 9.62 9.52 13,000 5.01 1.46 630
1/8/2016 AN 6,810 18.4 1.1 18 1370 15.6 0.77 15.6 14.7 25,000 8.7 2.5 983
4/4/2016 AN 5,260 13.2 0.71 16.1 1040 12.3 1.43 11.4 12.2 21,600 7.9 2.1 761
8/2/2016 AN 4,640 16.2 0.84 16.5 1330 16.1 0.66 15.6 13.6 19,700 14.3 2.57 1000
10/6/2016 AN 5,190 23.5 1.01 17.6 1400 17.1 0.74 16.5 14.6 22,100 7.5 4.25 1060
1/6/2017 AN 2,260 8.17 1.01 7.35 487 10.1 0.69 5.41 5.16 14,800 1.18 1.92 374
4/3/2017 AN 5,620 19.9 0.95 21.6 1140 13.3 2.33 17.2 14.5 23,500 3.16 3.73 1080
7/10/2017 AN 44,600 1.34 19.1 1050 18.6 0.18 16.3 12.5 36,300 34.2 2.52 940
10/4/2017 AN 49,000 34.2 0.993 16.1 1160 17.3 2.17 14.6 10.9 37,000 29.1 2.36 933
1/2/2018 AN 15,900 25.4 1.04 18.4 1240 15 1.28 19.1 12.9 24,700 4.99 2.08 1020
4/6/2018 AN 7,660 17.3 0.733 12.1 895 11.8 2.63 14.7 9.27 15,700 6.13 2.65 902
7/16/2018 AN 6,650 15.2 0.895 21.9 1130 17.5 1.08 17 18.9 22,000 51.9 2.89 1020
11/26/2018 AN 7,480 27.2 1.25 19.8 1430 11.1 3.76 24.8 15 27,000 6.52 1.41 55.4
1/11/2019 AN 5,800 26.6 1.23 18.3 1370 7.75 0.66 22.3 13.3 26,200 5.63 2.27 1390
4/8/2019 AN 4,240 15.8 0.796 14.9 861 5.07 1.78 13.6 10.5 13,600 3.12 2.91 559
7/15/2019 AN 22,300 23.9 0.768 19.2 1220 4.41 0.23 15.6 14 31,100 2.06 1.89 731
10/7/2019 AN 32,500 29.4 0.78 19.1 1490 3.14 0.39 20.1 12.8 35,700 2.58 3.17 760
1/6/2020 AN 29,700 26 1.11 17.8 1370 10.9 0.98 18.4 14.2 40,300 9.53 2.22 1070
4/60/20 AN 30,100 20.6 0.738 15.9 1010 9.37 0.56 13.6 9.22 37,900 5.32 1.3 848
7/13/2020 AN 36,400 24.9 0.673 16.9 1030 9.71 1.35 16 10.6 40,900 6.91 0.902 906
10/21/2020 AN 41,400 30.3 0.651 16.7 1280 11.5 1.46 16.7 9.89 42,100 4.94 2.39 927
1/15/2021 AN 32,600 20.2 0.662 12.5 1060 8.01 0.42 14.1 8.92 35,100 5.68 1.48 763
4/13/2021 AN 39,800 21.7 0.561 17.1 1140 9.53 0.09 15.8 10.7 31,100 10.80 1.62 859
7/15/2021 AN 34,100 21.4 0.776 17.5 946 10.3 0.083 14.8 9.86 35,200 4.51 1.4 890
10/25/2021 AN 49,600 29 0.561 15.6 1060 10.1 0.3 15.4 11.8 31,300 5.45 1.12 882
1/31/20022 AN 44,000 20.5 0.32 17.1 802 9.11 0.2 11.4 9.26 28,200 5.6 1.23 682
4/22/2022 AN 61,200 29 0.168 24.4 1020 8.19 0.24 12.6 9.07 32,600 9.33 0.929 809
7/15/2022 AN 71,800 32.9 0.899 24.5 963 7.89 0.38 14.4 14.7 36,300 8.84 1.95 926
10/4/2022 AN 66,000 27.1 0.834 16.4 992 8.81 0.229 14.9 11.5 42,000 6.31 1.73 907
Page 5
Central Davis Sewer District
Anaerobic Biosolids - Historic Table
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphorus Selenium Silver Zinc ppm
Date Type ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
2/17/2023 AN 40,300 25.6 0.66 20.5 813 11.2 0.329 15 9.02 34,800 5.54 2.32 844
4/7/2023 AN 44,200 25.2 0.954 26.8 837 8.13 0.42 12.5 15.3 37,100 11.8 0.871 928
7/28/2023 AN 51,400 18.2 0.889 28.9 819 6.95 0.30 10.3 14.4 36,900 2.78 2.28 969
10/16/2023 AN 60,550 40.0 0.8305 20.5 787 5.75 0.37 15.6 13.15 39,100 7.07 2.555 828
2/5/2024 AN 62,100 34.5 0.62 16.6 780 4.4 0.173 15.8 11.3 56,800 1.1875 2 732
4/22/2024 AN 59,000 31.8 0.86 23.4 754 9.03 0.34 12.7 12.2 40,700 9.69 1.85 836
7/15/2024 AN 60,600 33.5 0.75 22.3 842 6.45 0.27 15.8 11.9 44,700 8.87 1.72 915
11/25/2024 AN 61,200 31.1 0.86 17.00 1010 6.72 0.451 17.6 7.24 41,900 6.95 1.7 995
average 20,241.5 10.9 1.6 17.0 627.9 22.9 2.4 9.4 13.2 24,610.6 7.0 9.9 568.3
Std. Dev.15,818.8 8.5 1.4 5.4 338.6 16.3 1.9 4.3 3.2 9,235.1 5.6 8.3 247.0
Avg-2StDv 0.0 0.0 0.0 6.2 0.0 0.0 0.0 0.8 6.7 6,140.5 0.0 0.0 74.3
Avg+2StDv 51,879.1 27.9 4.4 27.8 1,305.2 55.4 6.2 17.9 19.7 43,080.8 18.3 26.4 1,062.4
Note: 1. When a value was found to be below the detection limit, the whole number of the detection limit was used in the analysis.
2. An ** indicates that the value has not been used because of suspect integrity
Page 6
Central Davis Sewer District
Anaerobic Biosolids
Aluminum Quality Control Chart
0.0
10,000.0
20,000.0
30,000.0
40,000.0
50,000.0
60,000.0
70,000.0
80,000.0
1 21416181101121
Aluminum LCL UCL Linear (Aluminum)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Al QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Arsenic Quality Control Chart
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
1 21416181101121141161181201
Arsenic LCL UCL Linear (Arsenic)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 As QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Cadmium Quality Control Chart
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
1 21 41 61 81 101 121 141 161 181 201 221 241
Cadmium LCL UCL Linear (Cadmium)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Cd QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Chromium Quality Control Chart
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
1 21 41 61 81 101 121 141 161 181 201 221 241
Chromium LCL UCL Linear (Chromium)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Cr QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Copper Quality Control Chart
0.0
200.0
400.0
600.0
800.0
1,000.0
1,200.0
1,400.0
1,600.0
1 21 41 61 81 101 121 141 161 181 201 221 241
Copper LCL UCL Linear (Copper)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Cu QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Lead Quality Control Chart
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
1 21 41 61 81 101 121 141 161 181 201 221 241
Lead LCL UCL Linear (Lead)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Pb QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Mercury Quality Control Chart
0.0
2.0
4.0
6.0
8.0
10.0
12.0
1 21 41 61 81 101 121 141 161 181 201 221 241
Mercury LCL UCL Linear (Mercury)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Hg QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Molybdenum Quality Control Chart
0.0
5.0
10.0
15.0
20.0
25.0
30.0
1 21416181101121141161181201
Molybdenum LCL UCL Linear (Molybdenum)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Mo QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Nickel Quality Control Chart
0.0
5.0
10.0
15.0
20.0
25.0
30.0
1 21 41 61 81 101 121 141 161 181 201 221 241
Nickel LCL UCL Linear (Nickel)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Ni QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Selenium Quality Control Chart
0.0
10.0
20.0
30.0
40.0
50.0
60.0
1 21 41 61 81 101 121 141 161 181 201
Selenium LCL UCL Linear (Selenium)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Se QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Silver Quality Control Chart
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
1 21416181101121
Silver LCL UCL Linear (Silver)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Ag QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Zinc Quality Control Chart
0
200
400
600
800
1,000
1,200
1,400
1,600
1 21 41 61 81 101 121 141 161 181 201 221 241
Zinc LCL UCL Linear (Zinc)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Zn QC Chart
Central Davis Sewer District
Anaerobic Biosolids
Phosphorus Quality Control Chart

0
10,000
20,000
30,000
40,000
50,000
60,000
1 21416181
Phosphorus LCL UCL Linear (Phosphorus)
1/16/2025 5:02 PM
Anaerobic Biosolids Metals Summary 2024 Phos QC Chart
CDSD Compost Metals Quality - 2024
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphorus Selenium Silver Zinc
Date Type ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
7/11/2024 CPT 7,920 9.8 0.6 12.1 353 18.3 0.08 3.8 7.0 14,000 2.6 0.8 479
7/11/2024 CPT 6,970 8.8 0.6 8.9 292 9.5 0.10 3.7 6.3 14,600 1.1 0.2 349
7/11/2024 CPT 6,790 10.0 0.7 12.9 346 13.1 0.39 4.7 7.1 13,500 1.0 0.7 362
7/11/2024 CPT 4,690 7.2 0.5 8.7 270 8.9 0.13 3.4 5.4 9,760 0.7 0.5 281
7/11/2024 CPT 4,550 6.7 0.4 6.9 242 6.5 0.07 3.6 4.7 9,220 0.8 0.5 258
9/26/2024 CPT 6,080 3.5 0.1 3.1 110 3.2 0.2 1.4 1.6 4,690 0.9 0.2 126
Minimum 4,550 3.5 0.1 3.1 110 3.2 0.1 1.4 1.6 4,690 0.7 0.2 126
Average 6,167 7.6 0.5 8.8 269 9.9 0.2 3.4 5.4 10,962 1.2 0.5 309
Maximum 7,920 10.0 0.7 12.9 353 18.3 0.4 4.7 7.1 14,600 2.6 0.8 479
TKN
Ammonia
as N
Nitrate+
Nitrite-
Total
Total
Solids
Date ppm ppm ppm %
7/11/2024 21,400 1,740 0.25 94
7/11/2024 15,300 1,230 548 59
7/11/2024 20,500 1,380 377 66
7/11/2024 27,000 1,380 174 89
7/11/2024 23,600 1,360 348 87
9/26/2024 10,700 461 79 79
Minimum 10,700 461 0 59
Average 19,750 1,259 254 79
Maximum 27,000 1,740 548 94
Total Year Values
*Notes: All ND values are taken as 0.25*MDL and shown as blue
2/5/2025 8:55 AM
https://d.docs.live.net/98ae734ac05258f0/BIOSOLIDS Files/Biosolids - Consolidated Data/Biosolids Report - Calendar Year 2024/5. Compost Biosolids Chemical Quality/Compost Biosolids Metals
Summary - 2024
Central Davis Sewer District
Composted Biosolids - Historic Table
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphr Selenium Silver Zinc
Date #ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
4/5/1999 Compost 1 7,700.0 14 0.7 14 290 18 2.4 15 12 14 4.7 220
4/5/1999 Compost 2 11,000.0 15 0.8 18 320 22 2.8 3 15 15 6 340
4/5/1999 Compost 3 9,900.0 14 0.7 17 300 32 3 2.8 13 14 5.5 260
4/5/1999 Compost 4 9,800.0 14 0.7 16 300 25 2.4 4 13 14 5.3 260
4/6/2000 N22 12,000.0 11 1 18 410 52 1.4 3 13 17,000.0 5 9 320
4/6/2000 S22 10,000.0 5 1.1 17 380 28 1.3 7 12 15,000.0 5 8 300
4/6/2000 W12 13,000.0 5 1 21 400 33 1.9 3 16 18,000.0 5 8.7 310
4/6/2000 E12 12,000.0 5 1.4 19 430 39 1.6 4 14 19,000.0 5 9 330
4/6/2000 N21 12,000.0 5 1 18 380 38 1.64 3 13 17,000.0 5 8 310
4/6/2000 S21 9,400.0 5 1 19 340 28 1.6 2 11 14,000.0 5 7 260
4/6/2000 W11 13,000.0 5 1 19 450 36 1.6 4 14 19,000.0 5 9.5 320
4/6/2000 E11 11,000.0 5 1 17 360 120 2.3 3 13 17,000.0 10 8.6 310
11/3/2000 18 12,000.0 5 0.6 15 390 20 1.3 6 11 18,000.0 13 10 280
11/3/2000 43 10,000.0 5.5 0.6 13 350 16 1.6 3 9 16,000.0 5.5 8 250
11/3/2000 80 13,000.0 6 0.3 17 460 26 1.9 5 13 19,000.0 16 9.3 330
11/3/2000 86 17,000.0 6.5 0.9 20 0.5 37 1.9 7 15 24,000.0 19 14 410
11/3/2000 87 12,000.0 6.5 0.35 15 420 27 2 6 11 17,000.0 6.5 9 310
11/3/2000 93 14,000.0 6.5 0.3 16 450 23 2 5 12 20,000.0 6.5 9.6 300
12/5/2001 1 8,400.0 5 0.25 9.6 370 16 2 4 9 13,000.0 5 6.9 220.0
12/5/2001 2 12,000.0 4.5 0.6 13 450 21 2.1 4 10 19,000.0 11 9 300.0
12/5/2001 3 9,300.0 5 0.5 11 370 14 1.2 4 9 14,000.0 5 7 230.0
12/5/2001 4 15,000.0 4.5 0.8 15 540 34 2.6 5 13 22,000.0 4.5 13 380.0
6/17/2002 1 1 8,800.0 17 0.6 26 360 10 4 9 13000.0 11 5.4 250
6/17/2002 1 2 13,000.0 5 0.5 15 460 11 5 12 20000.0 5 8.2 290
6/17/2002 2 1 13,000.0 5 0.7 14 430 14 5 10 18000.0 11 7.3 290
6/17/2002 2 2 6,800.0 5 0.025 7.7 290 9 6 7 10000.0 5 4.4 170
6/17/2002 3 1 31,000.0 5 0.025 30.7 170 3.5 4 4 7100.0 5 2.4 96
6/17/2002 3 2 16,000.0 10 0.5 19 530 7 5 14 24000.0 10 8 370
5/8/2003 11 13,000 12 1 12 390 15 1.7 3 11 16000.0 5 6.8 290
5/8/2003 12 13,000 5 1.1 11 410 17 2 4 10 16000.0 5 7.8 280
5/8/2003 13 14,000 5 1.2 13 480 18 2.3 5 12 20000.0 5 8.2 330
5/8/2003 14 9,800 5 0.9 8.8 310 12 2.2 4 8 14000.0 5 4.5 240
5/8/2003 21 12,000 5 1 11 370 16 1.6 4 9 15000.0 5 5.7 280
5/8/2003 22 12,000 5 1 11 360 16 2 4 10 16000.0 5 5.4 260
5/8/2003 23 11,000 5 1 10 380 14 1.4 4 9 15000.0 5 5.6 270
10/8/2003 101 8,600 5 0.7 7 310 12 1.9 3 7 11000.0 5 8.2 220
10/8/2003 102 7,000 5 0.7 5.9 250 9 1.3 3 6 10000.0 5 4.8 190
10/8/2003 103 12,000 5 1 10 400 17 1.9 4 9.6 17000.0 5 8.1 300
1/31/2004 B-40 15,000 5 0.7 12 570 18 1.7 8 11 21000 5 24 340
3/18/2004 4041 13,000 5 0.8 13 400 19 2.1 6 10 18000 5 8.4 290
3/18/2004 4042 11,000 5 0.7 9.3 340 22 1.5 3 7 16000 5 8.3 250
8/27/2004 8041 12,000 11 0.7 17 360 20 1.2 12 13 15000 5 13 290
8/27/2004 8042 12,000 5 0.6 14 380 20 1.5 8 11 16000 5 15 290
8/27/2004 8043 13,000 12 0.7 22 420 15 1.5 7 11 19000 5 18 310
8/27/2004 8044 12,000 5 0.5 14 380 12 1.5 6 11 16000 5 15 280
8/19/2005 C-17 7500 5 1.2 11 280 13 2.7 1 9 10000 5 9 220
8/19/2005 C-37 10400 5 1.3 12.6 353 14 2.7 1 12 13900 5 10.5 309
8/19/2005 C-63 8860 5 1.2 10.9 322 12 2.7 1 10 12300 5 9.6 539
11/6/2005 c-51 7800 5 0.7 12 330 8 2.7 3 11 11500 5 8.8 250
11/6/2005 c-52 7240 5 0.7 12 305 8 2.7 3 11 10600 5 8.7 225
11/6/2005 c-53 7850 5 0.6 12 300 8 2.7 3 10 11700 5 9.5 230
6/4/2006 1 3020 5 0.25 5.2 189 3.5 0.97 3.5 4.7 6400 5 5.2 113
6/4/2006 2 7200 5 0.5 10 400 10 0.7 3 8 12000 5 10 240
6/4/2006 3 7400 5 0.25 11 370 11 1 3 8.6 12000 5 10 240
6/4/2006 4 7500 5 0.25 10 370 11 1.1 4 8 12000 5 12 230
6/4/2006 5 6100 5 0.25 9.5 300 9.4 0.8 3 7 9900 5 9.4 200
10/5/2006 1 6000 5 0.25 10 300 12 1.3 3 8 12000 5 9.3 250
4/27/2007 4271 5900 6 0.6 10.55 420 9.6 0.9 4.5 8 12000 2.5 8 260
4/28/2007 4272 5600 6.3 0.6 10 400 9 0.8 4.5 8 12000 2.5 9.2 270
4/29/2007 4273 6300 6.8 6 11 440 10 1.2 6.7 8.7 13000 2.5 8.7 300
7/27/2007 CM-72707-1 3500 5.3 0.25 10 247 7 0.5 4 6.7 7500 2.5 5.2 170
7/28/2007 CM-72707-2 3000 6 0.25 8.4 222 7 0.6 4 7.4 6500 2.5 4.4 140
8/16/07 07 09065 5918 6 0.5 11.1 392 12 0.9 3 11.1 13800 2 9.2 298
8/28/07 07 09527 8100 8 0.7 17 574 13 1.3 4 11.5 20700 2.5 14 360
4/15/08 804513 5690 7 0.5 9 511 9 1.54 3 8 13700 2.5 7.8 300
4/15/08 804514 6440 7 0.5 10.6 558 11 1.26 5 8.6 15600 2.5 8.3 342
5/20/2008 806162 4730 7 0.5 10.1 376 10 0.81 4 7.8 11100 2.5 6.4 260
8/1/2008 810140 5900 7 0.6 12.3 384 31 1.31 4 8.6 15200 2.5 7.1 286
9/19/2008 813057 5420 7.7 0.7 11.2 404 26 0.84 3.3 8.4 15850 2.5 6.7 307
2/5/2025 8:55 AM
https://d.docs.live.net/98ae734ac05258f0/BIOSOLIDS Files/Biosolids - Consolidated Data/Biosolids Report - Calendar Year 2024/5. Compost Biosolids Chemical
Quality/Compost Biosolids Metals Summary - 2024
Central Davis Sewer District
Composted Biosolids - Historic Table
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphr Selenium Silver Zinc
Date #ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
9/30/08 813589 6500 8 0.7 13.6 451 21 1.21 3 9.4 19100 2..5 7.1 348
4/14/09 CPT 5480 10.4 0.7 14.2 585 13.5 1.2 4.1 9.4 14300 3.8 6.8 375
4/30/09 CPT 4910 8.2 0.6 9 462 12.4 0.7 3.8 7.1 12300 3 5.4 320
5/28/09 CPT 5760 8.9 0.8 11.4 535 18.3 0.9 4.4 8.6 15500 5.2 6.7 387
5/28/09 CPT 6090 8.1 0.8 12 554 18.2 0.9 4.7 8.7 15500 3.2 7.1 391
5/28/09 CPT 3620 8 0.6 8.3 395 14.1 0.5 4.5 7.3 9990 5.1 4.3 251
9/24/09 CPT 6760 10.6 0.8 14.2 586 14.1 1.2 8.2 11 18000 4.7 6.9 497
4/21/10 CPT 3960 9.1 0.6 9.8 471 9.7 0.7 5.6 6.8 11300 3.7 5.0 293
4/21/10 CPT 3440 8.1 0.5 7.9 436 8.9 0.6 3.7 6.6 9240 5.0 4.4 254
4/21/10 CPT 4640 9.3 0.7 10.0 533 9.9 0.8 4.9 8.1 12800 5.1 5.6 334
6/23/2010 CPT 3,740 8.9 0.6 8.2 403 7.2 0.7 4.1 6.5 12,600 4.2 4.7 259
6/23/2010 CPT 3,790 8.3 0.5 8.6 395 7.5 0.7 4.0 6.5 13,100 3.6 4.4 253
10/11/2010 CPT 4,520 8.5 0.5 10.4 409 9.4 0.9 3.2 8.0 1,480 5.3 4.2 254
6/6/2011 CPT 6,430 17.5 0.7 14.6 559 17.2 0.8 5.2 10.3 15,400 11.7 5.3 349
6/6/2011 CPT 4,820 19.2 0.7 10.1 561 14.4 0.1 5.1 8.0 13,200 13.0 5.1 330
6/6/2011 CPT 5,200 15.7 0.7 10.6 562 13.3 0.6 4.5 8.1 13,900 9.8 5.5 334
7/26/2011 CPT 3,480 14.6 0.5 10.6 415 14.0 0.6 4.8 7.9 10,100 8.7 4.0 263
7/26/2011 CPT 4,740 16.4 0.7 12.1 495 13.3 0.9 4.4 8.3 12,500 10.0 5.0 312
10/10/2011 CPT 5,070 12.7 0.7 15.4 503 12.9 0.7 3.7 10.6 14,200 6.5 5.0 332
5/3/2012 CPT 2,500 13.9 0.6 10.3 399 7.6 0.7 4.5 6.6 9,890 8.3 2.7 258
5/3/2012 CPT 2,510 13.5 0.6 11.4 404 8.5 0.7 4.2 6.9 9,640 7.1 2.7 259
5/3/2012 CPT 3,150 16.4 0.7 18.1 478 9.6 0.6 5.1 7.7 11,600 6.1 3.4 311
8/14/2012 CPT 3,820 12.3 0.8 13.8 466 13.0 0.8 3.8 8.7 14,500 7.5 3.7 316
8/14/2012 CPT 4,200 12.6 0.7 14.5 472 12.9 0.8 4.0 8.8 15,400 7.3 3.8 325
8/14/2012 CPT 4,030 4.9 0.2 8.0 22.9 8.2 0.2 0.9 4.3 1,630 2.8 0.2 71.7
5/14/2013 CPT 2,550 14.7 0.6 7.6 464 10.9 0.4 3.8 6.8 10,200 7.1 3.3 266
6/27/2013 CPT 4,250 15.1 0.6 13.7 474 13.3 0.8 3.9 8.9 19,900 6.7 2.9 318
6/27/2013 CPT 3,400 12.6 0.7 11.8 502 25.4 0.3 3.8 8.1 13,400 6.6 3.5 337
6/27/2013 CPT 3,290 14.3 0.6 10.7 407 10.5 0.1 3.4 7.3 15,400 6.2 2.6 278
10/8/2013 CPT 2,390 10.8 0.5 9.5 392 8.5 0.8 4.3 7.0 9,390 3.1 2.6 254
10/8/2013 CPT 1,730 10.1 0.4 6.7 317 7.3 0.4 3.1 5.4 7,410 5.2 1.9 186
5/22/2014 CPT 1,510 5.8 0.3 5.1 303 5.5 0.5 3.2 2.2 7,160 3.1 1.9 220
5/22/2014 CPT 1,300 4.9 0.3 4.7 273 4.8 0.5 3.3 4.4 6,330 2.8 1.5 179
5/22/2014 CPT 1,720 4.4 0.4 5.5 300 6.0 0.5 4.5 5.2 7,460 3.0 1.6 202
6/9/2014 CPT 2,970 7.2 0.5 10.0 397 12.7 0.6 4.2 8.0 11,500 1.8 1.9 261
10/20/2014 CPT 494 6.3 0.2 2.6 174 3.8 0.8 2.9 4.1 7,920 1.7 0.6 102
10/20/2014 CPT 677 4.3 0.1 2.8 167 3.6 1.1 2.8 3.3 5,360 1.1 0.8 100
5/11/2015 CPT 821 2.6 0.3 4.1 172 9.5 0.2 1.7 3.0 4,530 1.8 0.4 138
5/11/2015 CPT 1,250 3.5 0.4 9.6 277 7.7 0.3 2.6 7.6 6,620 3.7 1.2 189
5/11/2015 CPT 1,260 3.9 0.4 5.1 298 6.8 0.3 2.9 4.3 5,370 2.5 1.1 180
5/11/2015 CPT 1,410 4.7 0.4 5.2 304 7.5 0.3 3.1 4.6 8,184 3.2 1.1 211
10/1/2015 CPT 3,550 7.1 0.5 10.9 408 10.1 0.5 3.4 8.6 10,500 1.9 1.0 292
10/1/2015 CPT 2,540 7.3 0.5 13.8 474 11.5 0.5 4.4 8.5 11,000 2.0 1.9 328
9/28/2016 CPT 2,610 8.4 0.7 7.2 377 9.6 0.1 3.3 6.8 6,920 3.7 0.7 209
9/28/2016 CPT 2,420 10.0 1.0 13.1 300 10.0 0.1 1.0 10.9 7,310 15.8 1.0 198
9/28/2016 CPT 2,610 7.6 0.8 9.3 368 9.1 0.2 2.1 7.6 8,960 3.8 0.8 274
9/28/2016 CPT 1,790 7.2 0.7 6.5 258 7.2 0.3 1.9 5.3 8,110 3.6 0.7 166
9/28/2016 CPT 2,400 7.4 0.6 8.8 352 8.0 0.2 2.8 7.2 10,500 3.1 0.6 236
9/28/2016 CPT 1,730 6.6 0.7 6.7 243 6.6 0.1 2.3 5.2 6,710 3.3 0.7 169
2/22/2017 CPT 597 27.3 1.4 2.8 86.9 13.7 0.1 1.1 1.8 2,100 13.7 1.4 63.7
2/22/2017 CPT 1,390 8.8 1.4 4.9 240 4.9 0.3 6.7 4.5 8,590 13.9 0.3 305
2/22/2017 CPT 952 4.4 1.4 3.5 179 3.4 0.4 2.0 3.3 3,360 14.0 1.4 122
7/31/2017 CPT 2,590 16.7 0.3 8.7 292 5.9 0.1 3.0 6.1 7,400 12.1 0.4 223
7/31/2017 CPT 2,580 13.2 0.4 9.2 318 7.7 0.1 2.3 6.7 7,300 11.1 0.4 249
7/31/2017 CPT 3,000 13.8 0.3 9.4 293 7.9 0.1 2.5 7.8 7,280 12.5 0.4 246
2/27/2019 CPT 2,100 6.4 0.3 6.5 276 4.0 0.3 2.8 5.3 7,640 5.9 0.5 122
2/27/2019 CPT 2,940 7.1 0.4 16.0 411 <8.49 0.3 4.4 7.3 10,200 8.6 0.6 187
3/12/2019 CPT 2,130 9.2 0.3 7.8 355 <5.59 0.2 3.6 6.8 11,800 0.6 0.8 185
3/12/2019 CPT 2,560 9.7 0.3 9.0 424 <6.83 0.2 4.0 9.2 13,100 1.2 0.8 205
6/18/2019 CPT 3,920 7.6 0.4 7.3 399 35.5 0.2 3.5 6.7 10,800 5.0 0.6 233
7/25/2019 CPT 3,460 4.9 0.3 4.7 295 15.7 0.2 5.9 5.6 9,070 1.3 0.3 194
5/14/2020 CPT 1,570 6.1 0.3 6.0 276 7.2 0.1 4.0 5.0 10,200 3.4 0.5 176
5/14/2020 CPT 2,240 6.5 0.3 7.7 328 9.7 0.1 3.2 6.1 11,000 2.4 0.6 234
5/14/2020 CPT 2,850 6.3 0.3 7.8 330 12.1 0.1 3.4 6.1 10,100 2.4 0.6 232
5/14/2020 CPT 2,810 7.8 0.4 9.6 378 16.6 0.1 4.2 7.2 12,900 2.8 0.8 257
6/1/2020 CPT 1,450 4.6 0.2 4.9 232 6.4 0.1 3.1 4.8 7,930 2.0 0.4 150
6/1/2020 CPT 2,440 5.6 0.3 4.5 315 12.2 0.1 3.8 6.4 10,500 2.2 0.7 227
3/29/2021 CPT 9,507 10.1 0.3 9.4 434 10.9 0.0 3.9 7.0 13,700 2.7 0.8 343
3/29/2021 CPT 10,800 9.8 0.3 10.4 449 10.5 0.2 5.0 8.6 13,600 2.1 0.8 352
2/5/2025 8:55 AM
https://d.docs.live.net/98ae734ac05258f0/BIOSOLIDS Files/Biosolids - Consolidated Data/Biosolids Report - Calendar Year 2024/5. Compost Biosolids Chemical
Quality/Compost Biosolids Metals Summary - 2024
Central Davis Sewer District
Composted Biosolids - Historic Table
Aluminum Arsenic Cadmium Chromium Copper Lead Mercury Molyb Nickel Phosphr Selenium Silver Zinc
Date #ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm
3/29/2021 CPT 11,100 6.5 0.2 9.9 393 9.4 0.0 4.5 6.8 13,500 4.1 0.8 313
3/29/2021 CPT 10,600 8.3 0.2 10.1 416 16.1 0.1 4.6 6.4 14,500 3.5 0.8 321
3/29/2021 CPT 7,110 6.2 ND 6.7 349 7.6 0.1 3.3 7.0 10,300 3.6 0.5 257
3/29/2021 CPT 10,500 7.6 0.2 7.8 409 9.1 0.1 5.1 6.3 14,600 3.6 0.4 309
3/28/2022 CPT 10,100 6.8 0.2 6.6 352 6.8 0.1 3.9 4.8 14,100 2.7 0.5 291
3/28/2022 CPT 10,500 8.0 0.2 7.3 372 8.0 0.1 3.4 5.5 11,600 2.7 0.5 316
3/28/2022 CPT 11,900 9.4 0.3 8.6 434 7.6 0.1 4.0 5.7 18,800 3.9 0.7 320
3/28/2022 CPT 10,200 8.9 0.2 9.9 422 4.5 0.2 5.4 6.5 18,600 3.3 0.6 304
3/28/2022 CPT 6,630 5.5 0.1 5.3 292 4.1 0.1 4.0 3.9 9,810 2.9 0.5 205
3/28/2022 CPT 6870 5.7 0.1 5.7 306 5.2 0.1 3.4 4.5 10200 3.2 0.4 219
5/8/2023 CPT 20,000 7.7 0.6 9.0 302 4.7 0.09 5.5 5.1 13,100 2.8 0.8 358
5/8/2023 CPT 20,000 8.2 0.6 8.9 306 5.2 0.13 4.2 4.5 13,300 2.6 0.8 346
5/30/2023 CPT 5,360 3.1 0.3 6.0 177 3.0 0.10 2.7 3.4 7,390 0.6 0.3 171
5/30/2023 CPT 5,870 4.2 0.3 6.4 206 4.5 0.20 2.7 3.6 7,950 1.6 0.3 209
5/30/2023 CPT 6,800 3.3 0.4 7.4 229 3.6 0.01 2.3 4.2 8,790 1.6 0.4 206
7/5/2023 CPT 7,940 3.0 0.6 8.7 221 2.4 0.1 1.3 5.1 11,700 1.4 0.7 243
average 7,033 7.9 0.6 10.9 368 14.0 1.1 4.0 8.2 12,550 5.4 5.0 264
Std. Dev.4,759 3.9 0.5 4.5 105 12.1 1.1 1.8 2.9 4,431 3.6 4.2 74
Avg-2StDv 0 0.1 0.0 1.9 157 0.0 0.0 0.4 2.4 3,687 0.0 0.0 117
Avg+2StDv 16,550 15.6 1.7 19.9 579 38.3 3.3 7.5 13.9 21,412 12.6 13.5 412
Note: 1. When a value was found to be below the detection limit, the whole number of the detection limit was used in the analysis.
2. An ** indicates that the value has not been used because of suspect integrity
2/5/2025 8:55 AM
https://d.docs.live.net/98ae734ac05258f0/BIOSOLIDS Files/Biosolids - Consolidated Data/Biosolids Report - Calendar Year 2024/5. Compost Biosolids Chemical
Quality/Compost Biosolids Metals Summary - 2024
Central Davis Sewer District
Composted Biosolids
Aluminum Quality Control Chart
0.0
5,000.0
10,000.0
15,000.0
20,000.0
25,000.0
30,000.0
35,000.0
1 21 41 61 81 101 121 141
Aluminum LCL UCL Linear (Aluminum)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Al QC Chart
Central Davis Sewer District
Composted Biosolids
Arsenic Quality Control Chart
0
5
10
15
20
25
30
1 21 41 61 81 101 121 141
Arsenic LCL UCL Linear (Arsenic)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 As QC Chart
Central Davis Sewer District
Composted Biosolids
Cadmium Quality Control Chart
0
1
2
3
4
5
6
7
1 21 41 61 81 101 121 141
Cadmium LCL UCL Linear (Cadmium)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Cd QC Chart
Central Davis Sewer District
Composted Biosolids
Chromium Quality Control Chart
0
5
10
15
20
25
30
35
1 21 41 61 81 101 121 141
Chromium LCL UCL Linear (Chromium)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Cr QC Chart
Central Davis Sewer District
Composted Biosolids
Copper Quality Control Chart
0
100
200
300
400
500
600
700
1 21 41 61 81 101 121 141
Copper LCL UCL Linear (Copper)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Cu QC Chart
Central Davis Sewer District
Composted Biosolids
Lead Quality Control Chart
0
20
40
60
80
100
120
140
1 21 41 61 81 101 121 141
Lead LCL UCL Linear (Lead)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Pb QC Chart
Central Davis Sewer District
Composted Biosolids
Mercury Quality Control Chart
-1
0
1
2
3
4
5
6
7
1 21 41 61 81 101 121 141
Mercury LCL UCL Linear (Mercury)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Hg QC Chart
Central Davis Sewer District
Composted Biosolids
Molybdenum Quality Control Chart
0
2
4
6
8
10
12
14
16
1 21 41 61 81 101 121 141
Molybdenum LCL UCL Linear (Molybdenum)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Mo QC Chart
Central Davis Sewer District
Composted Biosolids
Nickel Quality Control Chart
0
2
4
6
8
10
12
14
16
18
1 21 41 61 81 101 121 141
Nickel LCL UCL Linear (Nickel)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Ni QC Chart
Central Davis Sewer District
Composted Biosolids
Selenium Quality Control Chart
0
2
4
6
8
10
12
14
16
18
20
1 21 41 61 81 101 121 141
Selenium LCL UCL Linear (Selenium)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Se QC Chart
Central Davis Sewer District
Composted Biosolids
Silver Quality Control Chart
-5
0
5
10
15
20
25
30
1 21 41 61 81 101 121 141
Silver LCL UCL Linear (Silver)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Ag QC Chart
Central Davis Sewer District
Composted Biosolids
Zinc Quality Control Chart
0
100
200
300
400
500
600
1 21 41 61 81 101 121 141
Zinc LCL UCL Linear (Zinc)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Zn QC Chart
Central Davis Sewer District
Composted Biosolids
Phosphorus Quality Control Chart
0.0
5,000.0
10,000.0
15,000.0
20,000.0
25,000.0
30,000.0
1 21 41 61 81 101 121 141
Phosphorus LCL UCL Linear (Phosphorus)
2/5/2025 8:55 AM
Compost Biosolids Metals Summary - 2024 Phos QC Chart
The analyses presented on this report were performed in accordance with the
National Environmental Laboratory Accreditation Program (NELAP) unless
noted in the comments, flags, or case narrative. If the report is to be used for
regulatory compliance, it should be presented in its entirety, and not be
altered.
Client Service Contact: 801.262.7299
Central Davis Sewer District
Attn: Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
Work Order: 24G0899
Project: Compost
7/23/2024
Approved By:
Mark Broadhead, Project Manager
9632 South 500 West Sandy, Utah 84070
Serving the Intermountain West since 1953
801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com
Page 1 of 9
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
7/11/24 14:10 @ 18.4 °C
7/23/2024
Compost
Sample ID: Compost #1
Lab ID: 24G0899-01Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/11/24 8:20
Preparation
Date/Time
Sampled By: Jace,Marjot,Jake
Minimum
Reporting
Limit MethodResult
Inorganic
mg/kg 7/15/247/15/2440.0 SM 4500 NH3 H1740Ammonia (Soluble) as N
mg/kg 7/22/247/22/241.00 EPA 300.0NDNitrate, Soluble
mg/kg 7/15/247/15/241.00 EPA 300.0NDNitrite, Soluble
mg/kg 7/16/247/15/245.1 SM 4500 Norg21400Total Kjeldahl Nitrogen
%7/12/247/12/240.1 CTF800096.5Total Solids
%7/12/247/12/240.1 SM 2540G93.6Total Solids
%7/12/247/12/240.1 SM 2540 E81.1Total Volatile Solids
Metals
mg/kg dry 7/16/247/15/249.3 EPA 6010D/3050B7920Aluminum, Total
mg/kg dry 7/16/247/15/244.63 EPA 6010D/3050B9.76Arsenic, Total
mg/kg dry 7/16/247/15/240.463 EPA 6010D/3050B0.595Cadmium, Total
mg/kg dry 7/16/247/15/240.463 EPA 6010D/3050B12.1Chromium, Total
mg/kg dry 7/16/247/15/240.463 EPA 6010D/3050B353Copper, Total
mg/kg dry 7/16/247/15/244.63 EPA 6010D/3050B18.3Lead, Total
mg/kg dry 7/16/247/15/240.028 EPA 7471A0.077Mercury, Total
mg/kg dry 7/16/247/15/240.926 EPA 6010D/3050B3.79Molybdenum, Total
mg/kg dry 7/16/247/15/240.463 EPA 6010D/3050B7.04Nickel, Total
mg/kg dry 7/16/247/15/2418.5 EPA 6010D/3050B14000Phosphorus, Total as P
mg/kg dry J7/16/247/15/242.78 EPA 6010D/3050B2.59Selenium, Total
mg/kg dry 7/16/247/15/240.463 EPA 6010D/3050B0.816Silver, Total
mg/kg dry 7/16/247/15/240.926 EPA 6010D/3050B479Zinc, Total
Project Name: Compost CtF WO#: 24G0899
www.ChemtechFord.com Page 2 of 8Page 2 of 9
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
7/11/24 14:10 @ 18.4 °C
7/23/2024
Compost
Sample ID: Compost #2
Lab ID: 24G0899-02Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/11/24 8:20
Preparation
Date/Time
Sampled By: Jace,Marjot,Jake
Minimum
Reporting
Limit MethodResult
Inorganic
mg/kg 7/15/247/15/2440.0 SM 4500 NH3 H1230Ammonia (Soluble) as N
mg/kg 7/18/247/18/2410.0 EPA 300.0548Nitrate, Soluble
mg/kg 7/15/247/15/241.00 EPA 300.0NDNitrite, Soluble
mg/kg 7/16/247/15/245.0 SM 4500 Norg15300Total Kjeldahl Nitrogen
%7/12/247/12/240.1 CTF800059.0Total Solids
%7/12/247/12/240.1 SM 2540G59.2Total Solids
%7/12/247/12/240.1 SM 2540 E88.4Total Volatile Solids
Metals
mg/kg dry 7/17/247/15/2415.3 EPA 6010D/3050B6970Aluminum, Total
mg/kg dry 7/17/247/15/247.65 EPA 6010D/3050B8.78Arsenic, Total
mg/kg dry J7/17/247/15/240.765 EPA 6010D/3050B0.566Cadmium, Total
mg/kg dry 7/17/247/15/240.765 EPA 6010D/3050B8.89Chromium, Total
mg/kg dry 7/17/247/15/240.765 EPA 6010D/3050B292Copper, Total
mg/kg dry 7/17/247/15/247.65 EPA 6010D/3050B9.46Lead, Total
mg/kg dry 7/16/247/15/240.043 EPA 7471A0.096Mercury, Total
mg/kg dry 7/18/247/15/241.53 EPA 6010D/3050B3.69Molybdenum, Total
mg/kg dry 7/17/247/15/240.765 EPA 6010D/3050B6.27Nickel, Total
mg/kg dry 7/19/247/16/2430.6 EPA 6010D/3050B14600Phosphorus, Total as P
mg/kg dry 7/17/247/15/244.59 EPA 6010D/3050BNDSelenium, Total
mg/kg dry 7/17/247/15/240.765 EPA 6010D/3050BNDSilver, Total
mg/kg dry 7/17/247/15/241.53 EPA 6010D/3050B349Zinc, Total
Project Name: Compost CtF WO#: 24G0899
www.ChemtechFord.com Page 3 of 8Page 3 of 9
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
7/11/24 14:10 @ 18.4 °C
7/23/2024
Compost
Sample ID: Compost #3
Lab ID: 24G0899-03Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/11/24 8:20
Preparation
Date/Time
Sampled By: Jace,Marjot,Jake
Minimum
Reporting
Limit MethodResult
Inorganic
mg/kg 7/15/247/15/2440.0 SM 4500 NH3 H1380Ammonia (Soluble) as N
mg/kg 7/18/247/18/2410.0 EPA 300.0374Nitrate, Soluble
mg/kg 7/15/247/15/241.00 EPA 300.02.80Nitrite, Soluble
mg/kg 7/16/247/15/245.3 SM 4500 Norg20500Total Kjeldahl Nitrogen
%7/12/247/12/240.1 SM 2540G65.9Total Solids
%7/12/247/12/240.1 CTF800072.5Total Solids
%7/12/247/12/240.1 SM 2540 E88.1Total Volatile Solids
Metals
mg/kg dry 7/16/247/15/2413.6 EPA 6010D/3050B6790Aluminum, Total
mg/kg dry 7/16/247/15/246.78 EPA 6010D/3050B10.0Arsenic, Total
mg/kg dry 7/16/247/15/240.678 EPA 6010D/3050B0.746Cadmium, Total
mg/kg dry 7/16/247/15/240.678 EPA 6010D/3050B12.9Chromium, Total
mg/kg dry 7/16/247/15/240.678 EPA 6010D/3050B346Copper, Total
mg/kg dry 7/16/247/15/246.78 EPA 6010D/3050B13.1Lead, Total
mg/kg dry 7/16/247/15/240.028 EPA 7471A0.039Mercury, Total
mg/kg dry 7/16/247/15/241.36 EPA 6010D/3050B4.65Molybdenum, Total
mg/kg dry 7/16/247/15/240.678 EPA 6010D/3050B7.13Nickel, Total
mg/kg dry 7/16/247/15/242.71 EPA 6010D/3050B13500Phosphorus, Total as P
mg/kg dry 7/16/247/15/244.07 EPA 6010D/3050BNDSelenium, Total
mg/kg dry 7/16/247/15/240.678 EPA 6010D/3050B0.732Silver, Total
mg/kg dry 7/16/247/15/241.36 EPA 6010D/3050B362Zinc, Total
Project Name: Compost CtF WO#: 24G0899
www.ChemtechFord.com Page 4 of 8Page 4 of 9
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
7/11/24 14:10 @ 18.4 °C
7/23/2024
Compost
Sample ID: Compost #4
Lab ID: 24G0899-04Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/11/24 8:40
Preparation
Date/Time
Sampled By: Jace,Marjot,Jake
Minimum
Reporting
Limit MethodResult
Inorganic
mg/kg 7/15/247/15/2440.0 SM 4500 NH3 H1380Ammonia (Soluble) as N
mg/kg 7/18/247/18/2410.0 EPA 300.0174Nitrate, Soluble
mg/kg 7/15/247/15/241.00 EPA 300.0NDNitrite, Soluble
mg/kg 7/16/247/15/245.4 SM 4500 Norg27000Total Kjeldahl Nitrogen
%7/12/247/12/240.1 SM 2540G88.7Total Solids
%7/12/247/12/240.1 CTF800089.1Total Solids
%7/12/247/12/240.1 SM 2540 E88.7Total Volatile Solids
Metals
mg/kg dry 7/16/247/15/249.9 EPA 6010D/3050B4690Aluminum, Total
mg/kg dry 7/16/247/15/244.95 EPA 6010D/3050B7.16Arsenic, Total
mg/kg dry 7/16/247/15/240.495 EPA 6010D/3050B0.505Cadmium, Total
mg/kg dry 7/16/247/15/240.495 EPA 6010D/3050B8.70Chromium, Total
mg/kg dry 7/16/247/15/240.495 EPA 6010D/3050B270Copper, Total
mg/kg dry 7/16/247/15/244.95 EPA 6010D/3050B8.92Lead, Total
mg/kg dry 7/16/247/15/240.030 EPA 7471A0.127Mercury, Total
mg/kg dry 7/16/247/15/240.991 EPA 6010D/3050B3.40Molybdenum, Total
mg/kg dry 7/16/247/15/240.495 EPA 6010D/3050B5.43Nickel, Total
mg/kg dry 7/16/247/15/241.98 EPA 6010D/3050B9760Phosphorus, Total as P
mg/kg dry 7/16/247/15/242.97 EPA 6010D/3050BNDSelenium, Total
mg/kg dry J7/16/247/15/240.495 EPA 6010D/3050B0.456Silver, Total
mg/kg dry 7/16/247/15/240.991 EPA 6010D/3050B281Zinc, Total
Project Name: Compost CtF WO#: 24G0899
www.ChemtechFord.com Page 5 of 8Page 5 of 9
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
7/11/24 14:10 @ 18.4 °C
7/23/2024
Compost
Sample ID: Compost #5
Lab ID: 24G0899-05Matrix: Solid
Flag(s)Units
Analysis
Date/Time
Date Sampled: 7/11/24 8:40
Preparation
Date/Time
Sampled By: Jace,Marjot,Jake
Minimum
Reporting
Limit MethodResult
Inorganic
mg/kg 7/15/247/15/2440.0 SM 4500 NH3 H1360Ammonia (Soluble) as N
mg/kg 7/18/247/18/2410.0 EPA 300.0348Nitrate, Soluble
mg/kg 7/15/247/15/241.00 EPA 300.0NDNitrite, Soluble
mg/kg 7/16/247/15/244.9 SM 4500 Norg23600Total Kjeldahl Nitrogen
%7/12/247/12/240.1 SM 2540G86.6Total Solids
%7/12/247/12/240.1 CTF800087.2Total Solids
%7/12/247/12/240.1 SM 2540 E90.8Total Volatile Solids
Metals
mg/kg dry 7/16/247/15/2410.1 EPA 6010D/3050B4550Aluminum, Total
mg/kg dry 7/16/247/15/245.06 EPA 6010D/3050B6.71Arsenic, Total
mg/kg dry J7/16/247/15/240.506 EPA 6010D/3050B0.385Cadmium, Total
mg/kg dry 7/16/247/15/240.506 EPA 6010D/3050B6.93Chromium, Total
mg/kg dry 7/16/247/15/240.506 EPA 6010D/3050B242Copper, Total
mg/kg dry 7/16/247/15/245.06 EPA 6010D/3050B6.49Lead, Total
mg/kg dry 7/16/247/15/240.029 EPA 7471A0.067Mercury, Total
mg/kg dry 7/16/247/15/241.01 EPA 6010D/3050B3.61Molybdenum, Total
mg/kg dry 7/16/247/15/240.506 EPA 6010D/3050B4.70Nickel, Total
mg/kg dry 7/16/247/15/242.02 EPA 6010D/3050B9220Phosphorus, Total as P
mg/kg dry 7/16/247/15/243.04 EPA 6010D/3050BNDSelenium, Total
mg/kg dry J7/16/247/15/240.506 EPA 6010D/3050B0.476Silver, Total
mg/kg dry 7/16/247/15/241.01 EPA 6010D/3050B258Zinc, Total
Project Name: Compost CtF WO#: 24G0899
www.ChemtechFord.com Page 6 of 8Page 6 of 9
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
7/11/24 14:10 @ 18.4 °C
7/23/2024
Compost
Report Footnotes
Abbreviations
ND = Not detected at the corresponding Minimum Reporting Limit (MRL).
1 mg/L = one milligram per liter or 1 mg/kg = one milligram per kilogram = 1 part per million.
1 ug/L = one microgram per liter or 1 ug/kg = one microgram per kilogram = 1 part per billion.
1 ng/L = one nanogram per liter or 1 ng/kg = one nanogram per kilogram = 1 part per trillion.
On calculated parameters, there may be a slight difference between summing the rounded values shown on the report
vs the unrounded values used in the calculation.
Flag Descriptions
J = Detected but below the Reporting Limit; therefore, result is an estimated concentration (CLP J-Flag).
Project Name: Compost CtF WO#: 24G0899
www.ChemtechFord.com Page 7 of 8Page 7 of 9
Page 8 of 9
Page 9 of 9
The analyses presented on this report were performed in accordance with the
National Environmental Laboratory Accreditation Program (NELAP) unless
noted in the comments, flags, or case narrative. If the report is to be used for
regulatory compliance, it should be presented in its entirety, and not be
altered.
Client Service Contact: 801.262.7299
Central Davis Sewer District
Attn: Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
Work Order: 24I2323
Project: Compost
10/7/2024
Approved By:
Mark Broadhead, Project Manager
9632 South 500 West Sandy, Utah 84070
Serving the Intermountain West since 1953
801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com
Page 1 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
9/26/24 14:05 @ 21.0 °C
10/7/2024
Compost
Sample ID: Compost #6
Lab ID: 24I2323-01Matrix: Solid Sample Type: Grab
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/26/24 10:10
Preparation
Date/Time
Sampled By: Marjot Kaur
Minimum
Reporting
Limit MethodResult
Inorganic
mg/kg 10/3/2410/2/2420.0 SM 4500 NH3 H461Ammonia (Soluble) as N
mg/kg 9/30/249/30/241.00 EPA 300.075.9Nitrate, Soluble
mg/kg 9/30/249/30/241.00 EPA 300.03.09Nitrite, Soluble
mg/kg 10/2/249/30/245.2 SM 4500 Norg10700Total Kjeldahl Nitrogen
%9/30/249/30/240.1 CTF800079.1Total Solids
%10/2/2410/2/240.1 SM 2540G79.1Total Solids
%10/2/2410/2/240.1 SM 2540 E88.7Total Volatile Solids
Metals
mg/kg dry 10/3/2410/1/242.9 EPA 6010D/3050B6080Aluminum, Total
mg/kg dry 10/3/2410/1/241.44 EPA 6010D/3050B3.47Arsenic, Total
mg/kg dry J10/3/2410/1/240.144 EPA 6010D/3050B0.130Cadmium, Total
mg/kg dry 10/3/2410/1/240.144 EPA 6010D/3050B3.07Chromium, Total
mg/kg dry 10/3/2410/1/240.144 EPA 6010D/3050B110Copper, Total
mg/kg dry 10/3/2410/1/241.44 EPA 6010D/3050B3.22Lead, Total
mg/kg dry 10/1/249/30/240.035 EPA 7471A0.158Mercury, Total
mg/kg dry 10/3/2410/1/240.289 EPA 6010D/3050B1.40Molybdenum, Total
mg/kg dry 10/3/2410/1/240.144 EPA 6010D/3050B1.62Nickel, Total
mg/kg dry 10/3/2410/1/24116EPA 6010D/3050B4690Phosphorus, Total as P
mg/kg dry 10/3/2410/1/240.867 EPA 6010D/3050B0.913Selenium, Total
mg/kg dry 10/3/2410/1/240.144 EPA 6010D/3050B0.205Silver, Total
mg/kg dry 10/3/2410/1/240.289 EPA 6010D/3050B126Zinc, Total
Project Name: Compost CtF WO#: 24I2323
www.ChemtechFord.com Page 2 of 4Page 2 of 5
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Central Davis Sewer District
Jill Jones
2200 South Sunset Drive
Kaysville, UT 84037
PO#:
Receipt:
Date Reported:
Project Name:
9/26/24 14:05 @ 21.0 °C
10/7/2024
Compost
Report Footnotes
Abbreviations
ND = Not detected at the corresponding Minimum Reporting Limit (MRL).
1 mg/L = one milligram per liter or 1 mg/kg = one milligram per kilogram = 1 part per million.
1 ug/L = one microgram per liter or 1 ug/kg = one microgram per kilogram = 1 part per billion.
1 ng/L = one nanogram per liter or 1 ng/kg = one nanogram per kilogram = 1 part per trillion.
On calculated parameters, there may be a slight difference between summing the rounded values shown on the report
vs the unrounded values used in the calculation.
Flag Descriptions
J = Detected but below the Reporting Limit; therefore, result is an estimated concentration (CLP J-Flag).
Project Name: Compost CtF WO#: 24I2323
www.ChemtechFord.com Page 3 of 4Page 3 of 5
Page 4 of 5
Page 5 of 5
Total Loads 61
Zone Number 3 Load Analysis
4.15 Acres Load Volume 1300 gal fertilizer required 1224.25 lbs
Fertilizer Required per Acre 400 lbs/acre Weight per gallon 8.35 lbs. nitrogen per load 20.2 lbs
(Based on Cropping Values)Specific Gravity 1.025
(for orchard grass and alfalfa mix)Weight per Load 11126 lbs Total Loads ‐ Calc 61
Total Fertilizer Required 1660 lbs NH4‐N Concentration 849 ppm
Fertilizer Available in Soil 21 ppm NO3‐N Volatilization Factor ‐ Kv 50%Application Acres 4.15
Total NO3‐N Available in Soil 435.75 lbs Fertilizer Value per Load 4.7 lbs Loads Per Acre 15
(Five times the NO3‐N in Soil)Organic Nitrogen Concentration 6941.0 ppm  Percent Solids 5.6%
Net Fertilizer Required for Zone 1224.25 lbs      (TKN‐NH4‐N)Solids Per Load 623 lbs
Mineralization Rate 20%Application Rate 4.6 tons/acre
Date
TKN 
(organic 
nitrogen)
NO3‐N 
Nitraite+Nitrit
e as N
NH3‐N 
Ammoni
a as N Organic ‐ N per Load 15.4 lbs Metric Rate 10.2 MT/Ha
2/17/2023 8,710 0 773 NO3 Concentration 0.3 ppm
4/7/2023 6820 0.25 851 NO3‐N per Load 0.0 lbs
7/28/2023 7840 0.25 923 Total Available Nitrogen per Load 20.2 lbs Total Loads Applied 54
Total 23370 0.75 2547 Loads Per Acre 13.0
Average 7790.0 0.3 849.00 Application Rate 4.1 tons/acre
Percent Solids:TKN ‐ NH3‐N=organic N ppm Metric Rate 9.1 MT/Ha
5.60%
Date Application Began:
Date Application Ended:
1/1/2024
3/28/2024
Application Analysis for Zone 3
Total Available Nitrogen ‐ Anaerobic Biosolids
Whole Sludge Application Rate Analysis ‐ Calculated
Anaerobic Sample ‐ in ppm
Whole Sludge Application Rate Analysis ‐ Actual
6941.0
CENTRAL DAVIS SEWER DISTRICT
Total Loads 213
Zone Number 6 Load Analysis
13.48 Acres Load Volume 1300 gal fertilizer required 4381 lbs
Fertilizer Required per Acre 400 lbs/acre Weight per gallon 8.35 lbs. nitrogen per load 20.6 lbs
(Based on Cropping Values)Specific Gravity 1.025
(for orchard grass and alfalfa mix)Weight per Load 11126 lbs Total Loads ‐ Calc 213
Total Fertilizer Required 5392 lbs NH4‐N Concentration 873 ppm
Fertilizer Available in Soil 15 ppm NO3‐N Volatilization Factor ‐ Kv 50%Application Acres 13.48
Total NO3‐N Available in Soil 1011 lbs Fertilizer Value per Load 4.9 lbs Loads Per Acre 16
(Five times the NO3‐N in Soil)Organic Nitrogen Concentration 7060.3 ppm  Percent Solids 5.9%
Net Fertilizer Required for Zone 4381 lbs      (TKN‐NH4‐N)Solids Per Load 656 lbs
Mineralization Rate 20%Application Rate 5.2 tons/acre
Date
TKN 
(organic 
nitrogen)
NO3‐N 
Nitraite+Nitrit
e as N
NH3‐N 
Ammoni
a as N Organic ‐ N per Load 15.7 lbs Metric Rate 11.6 MT/Ha
4/7/2023 8710 0 773 NO3 Concentration 0.2 ppm
7/28/2023 7840 0.25 923 NO3‐N per Load 0.0 lbs
10/16/2023 7250 0.25 923 Total Available Nitrogen per Load 20.6 lbs Total Loads Applied 203
Total 23800 0.5 2619 Loads Per Acre 15.1
Average 7933.3 0.2 873.00 Application Rate 4.9 tons/acre
Percent Solids:TKN ‐ NH3‐N=organic N ppm Metric Rate 11.1 MT/Ha
5.90%
Date Application Began:
Date Application Ended:
2/26/2024
12/5/2011
Application Analysis for Zone 6
Total Available Nitrogen ‐ Anaerobic Biosolids
Whole Sludge Application Rate Analysis ‐ Calculated
Anaerobic Sample ‐ in ppm
Whole Sludge Application Rate Analysis ‐ Actual
7060.3
1/31/2025  8:31 AM
https://d.docs.live.net/98ae734ac05258f0/BIOSOLIDS Files/Biosolids ‐ Consolidated Data/Biosolids Report ‐ Calendar Year 2024/9. Land Application Records/Ag Rate 
sludge loads calculations 2024‐25
Total Loads 54
Zone Number 2 Load Analysis
3.12 Acres Load Volume 1300 gal fertilizer required 1014 lbs
Fertilizer Required per Acre 400 lbs/acre Weight per gallon 8.35 lbs. nitrogen per load 18.7 lbs
(Based on Cropping Values)Specific Gravity 1.025
(for orchard grass and alfalfa mix)Weight per Load 11126 lbs Total Loads ‐ Calc 54
Total Fertilizer Required 1248 lbs NH4‐N Concentration 715 ppm
Fertilizer Available in Soil 15 ppm NO3‐N Volatilization Factor ‐ Kv 50%Application Acres 3.12
Total NO3‐N Available in Soil 234 lbs Fertilizer Value per Load 4.0 lbs Loads Per Acre 17
(Five times the NO3‐N in Soil)Organic Nitrogen Concentration 6628.7 ppm  Percent Solids 15.7%
Net Fertilizer Required for Zone 1014 lbs      (TKN‐NH4‐N)Solids Per Load 1747 lbs
Mineralization Rate 20%Application Rate 15.1 tons/acre
Date
TKN 
(organic 
nitrogen)
NO3‐N 
Nitraite+Nitrit
e as N
NH3‐N 
Ammoni
a as N Organic ‐ N per Load 14.8 lbs Metric Rate 34.0 MT/Ha
11/25/2024 6,240 1.0 664 NO3 Concentration 1.1 ppm
7/15/2024 8360 0.25 620 NO3‐N per Load 0.0 lbs
4/22/2024 7430 1.9 860 Total Available Nitrogen per Load 18.7 lbs Total Loads Applied 51
Total 22030 3.15 2144 Loads Per Acre 16.3
Average 7343.3 1.1 714.67 Application Rate 14.3 tons/acre
Percent Solids:TKN ‐ NH3‐N=organic N ppm Metric Rate 32.0 MT/Ha
15.70%
Date Application Began:
Date Application Ended:
12/16/2024
1/10/2025
Application Analysis for Zone 2
Total Available Nitrogen ‐ Anaerobic Biosolids
Whole Sludge Application Rate Analysis ‐ Calculated
Anaerobic Sample ‐ in ppm
Whole Sludge Application Rate Analysis ‐ Actual
6628.7
2024 Soil Sampling
QA Consulting and Testing, LLC
PO Box 627
Salem, Utah 84653
801-423-1116
Name: Von Isaman
Date: December 20, 2024 AB-DTPA Chromotropic
Extract Acid
Method Method
Customer Sample ID ppm P ppm NO3-N
Composite D 0/1 118.00 21.00
Composite D 1/2 31.00 8.00
Composite D 2/3 4.00 7.00
Composite D 3/4 3.00 9.00
Composite D 4/5 5.00 9.00
Composite Surface Sample 84.00 25.00
CDSD - 2024 Composite Deep Soil Sampling- to Confining Layer
Nitrates
Phosphorus 
0
5
10
15
20
25
12345
0
20
40
60
80
100
120
12345
https://d.docs.live.net/98ae734ac05258f0/BIOSOLIDS Files/Biosolids ‐ Consolidated Data/Biosolids Report ‐ Calendar Year 2024/9. Land 
Application Records/QA Consulting and Testing Graphs 2023
 8:41 AM 1/31/2025
Zone 613.48
Zone 77.02
Zone 919.99
Zone 54.34
Zone 116.75
Z
o
n
e

1
3
1
2
.
7
0
Z
o
n
e

1
2
7.
1
8
Zone 13.11
Zone 34.15
Zone 1010.75
Zone 813.02
Zone 411.64Zone 23.12
Land Application Zones
Created 2022
Sampled on December 20, 2024