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 11-56 - Effleunt Quality

Current through July 13, 2024
(a) Surface water
				  protection. Discharge from a land treatment system to a surface water body will
				  be regulated by the NPDES permit process.
(b) Groundwater protection. Percolation water
				  from land treatment of waste or wastewater shall not degrade groundwater
				  quality to the point at which it is no longer suitable for its current or
				  potential use as described in Chapter 8 of the Wyoming Water Quality
				  Regulations.
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IRRIGATION WATER QUALITY
Permissibility Classes for
Salinity
Class C1, low salinity: --
Good water with little or no likelihood of salt
					 accumulation under the leaching provided by average irrigation practices,
					 except where subsurface drainage is inadequate.
Class C2, medium salinity: --
Can be used if a moderate amount of leaching occurs. Plants
					 with moderate salt tolerance can be grown in most cases without special
					 practices for salinity control.
Class C3, high salinity: --
Cannot be used on soils with restricted drainage. With
					 adequate drainage, considerable excess water must be applied to each
					 irrigation; irrigations must be made more frequently, and plants with a good
					 salt tolerance should be selected.
Class C4, very high salinity: --
Not usable under ordinary conditions. On very light and
					 permeable soils with excellent drainage, water may be usable with a large
					 amount of excess leaching water, frequent irrigations, and very salt-tolerant
					 crops.
Permissibility Classes for
Alkalinity
Class S1, low sodium: --
Good for almost all soils and all Wyoming crops.
Class S2, medium sodium: --
Can cause alkali problems on heavy clayey soils, with low
					 leaching, unless gypsum (or equivalent soil amendments) are present or added to
					 the soils.
Class S3, high sodium: --
May create harmful levels of exchangeable sodium in all
					 soils and will require special management--good drainage, high leaching, and
					 organic matter additions. Soils containing natural gypsum may not develop
					 alkali troubles. Chemical amendments may be necessary, but are not feasible
					 with waters of very high salinity.
Class S4, very high sodium: --
Generally unsuited for irrigation. Special conditions of
					 low salinity water, favorable gypsum content of soils, tolerant crops, and
					 special management may permit use of these waters.
These water classes are based on recommendations of the
					 United States Regional Salinity Laboratory and numerous state agricultural
					 experiment stations.
TABLE I - Boron Class Limits
Limits -- parts per million
Description
Class
Sensitive crops
Semi-tolerant crops
Tolerant crops
1
Below 0.33
Below 0.67
Below 1.00
Very low. No effect on crops.
2
0.33 to 0.67
0.67 to 1.33
1.00 to 2.00
Low. Very slight effect on crops.
3
0.67 to 1.00
1.33 to 2.00
2.00 to 3.00
Moderate. Significant yield depression.
4
1.00 to 1.25
2.00 to 2.50
3.00 to 3.75
High. Large yield depression anticipated.
5
Over 1.25
Over 2.50
Over 3.75
Very high. Non-usable.
TABLE II - Selenium Class Limits
Class
Limits -- parts per million
Description
1
0.00 to 0.10
Low. No plant
							 toxicity anticipated.
2
0.11 to 0.20
Medium. Usable --
							 possible long-term accumulation under particular conditions and should be
							 watched
3
0.21 to 0.50
High. Doubtful --
							 probably toxic accumulation in plants except under especially favorable
							 conditions
4
Over 0.50
Very High.
							 Non-usable under any conditions.
TABLE III.
CHLORIDE AND SULFIDE LIMITS FOR THREE CLASSES OF IRRIGATION
					 WATERS
Chlorides
Sulfates
Class
meq/L
mg/L
meq/L
mg/L
I-
Excellent to good; or suitable for most
							 plants under most conditions
less than 2-5.5
71.1 - 195.5
4 - 10
192 - 480
II-
Good to injurious; harmful to some
							 under certain conditions of soil, climate and practices
2 -16
71.1 - 568.0
4 - 20
192 - 960
III-
Injurious to unsatisfactory;
							 unsuitable under most conditions
6 -16
213 - 568
12 - 20
576 - 960