Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 11 - DESIGN AND CONSTRUCTION STANDARDS FOR SEWERAGE SYSTEMS, TREATMENT WORKS, DISPOSAL SYSTEMS OR OTHER FACILITIES CAPABLE OF CAUSING OR CONTRIBUTING TO POLLUTION AND MOBILE HOME PARK AND CAMPGROUND SEWERAGE AND PUBLIC WATER SUPPLY DISTRIBUTION SYSTEMS › Part E - STANDARDS FOR THE APPLICATION OF BIOSOLIDS AND THE REUSE OF TREATED NON-DOMESTIC WASTEWATER › Section 11-55 - Irrigation Water Quality

Current through July 13, 2024
(a) The surface
				  infiltration rate and hydraulic conductivity of the soil profile shall be
				  approximated by the appropriate tests and used in determining an average annual
				  application rate.
(b) Indigenous or
				  crop plant species shall be capable of survival and maintenance under the
				  conditions of increased soil moisture, salinity, and alkalinity, the classes of
				  which will be determined by use of Figure 1, Tables 1-3 and a soil textural
				  analysis. Waste and wastewater analyses required for this evaluation include
				  electrical conductivity (EC in umhos/cm @ 25°C), sodium (Na+), calcium
				  (Ca2+), magnesium (Mg2+),
				  bicarbonate (HCO3), chloride (Cl-), sulfate (SO42-),
				  Boron (B) and Selenium (Se), and calculation of the Sodium Adsorption Ratio
				  (SAR) by use of the formula:
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(c) Numerical water quality criteria for
				  special situations.
(i) For continuous and
				  unrestricted irrigation of direct human consumption food crops or of parks,
				  playgrounds, highway rest areas and rights-of-way (R.O.W.s), or domestic,
				  commercial and industrial grounds with treated municipal wastewater effluent,
				  the following quality criteria shall not be exceeded:
pH
4.5 - 9.0 s.u.
BOD
10.0 mg/L Daytime
BOD
30 mg/L Dusk-Dawn
TSS
5.0 mg/L Daytime
TSS
100 mg/L Dusk-Dawn
Fecal Coliforms
200/100 mL
(positive disinfection)
TDS
480.0 mg/L
Electrical Condutivity, (EC)
750
							 micromhos/cm@25°C
Sodium Adsorption Ratio (SAR)
10
Chlorides (Cl-)
213 mg/L
Sulfates
							 (SO42-)
192 mg/L
Bicarbonates
							 (HO3-)
Not greater
							 than 50 percent of the total anion concentration in meq/L
Aluminum (Al)
5.0 mg/L
Arsenic (As)
1.0 mg/L
Beryllium (Be)
0.1 mg/L
Boron (B)
0.6 mg/L
Cadmium (Cd)
0.01 mg/L
Cobalt (Co)
0.5 mg/L
Chromium (Cr)
0.1 mg/L
Copper (Cu)
0.2 mg/L
Iron (Fe)
5.0 mg/L
Lead (Pb)
5.0 mg/L
Lithium (Li)
0.1 mg/L
Manganese (Mn)
10.0 mg/L
Nickel (Ni)
0.2 mg/L
Selenium (Se)
0.1 mg/L
Vanadium (V)
0.1 mg/L
Zinc (Zn)
2.0 mg/L
(ii) For disposal of limited volumes of
				  industrial wastewater and sludge of less than 10 percent solids, the following
				  criteria shall not be exceeded:
pH
4.5 - 9.0 s.u.
Electrical Conductivity (EC)
3,250
							 micromhos/cm @25°C
Total Dissolved Solids
2,100 mg/L
Sodium Adsorption Ratio (SAR)
26
Potassium
In combination with sodium, will
							 not produce an SAR greater than 26
Chlorides (Cl-)
1,500 mg/L
Sulfates (SO42-)
960 mg/L
Bicarbonates (HCO3- )
Not greater than 50
							 percent of the total anion concentration, meq/L
Arsenic (as
							 H3AsO4, Arsenious Acid)
0.1 mg/L
Boron (as
							 H3BO3, Boric Acid)
2.0
							 mg/L
Chromium (Cr)
1.0 mg/L
Copper (Cu)
1.0 mg/L
Nickel (Ni)
0.2 mg/L
Selenium (Se)
0.2 mg/L
Zinc (Zn)
2.0 mg/L
Oil and grease
20,000 lbs/ac when soil
							 incorporated (surface 6 inches) 2,000 lbs/ac when surface applied
(iii) All other continuous disposal land
				  application systems will be approved on a site specific, case by case basis by
				  use of the applicable standards and guidelines.