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Geologically hazardous areas | No effect on Category I or II | Effect on Category II | Effect on Category I |
Frequently flooded areas | None affected | No reduction in flood abatement volume | Reduces flood volume of 100-year floodplain |
Regulated wetlands or fish and wildlife habitat conservation areas | No impact | Mitigable impact | Any impact that cannot be mitigated |
Air Pollution |
Air pollutants and emission rates | Normal for SFR/EQ (2) (including meeting requirements of Chapter 173-433 WAC) | > 1 SFR/EQ; or Pollutant types or emission levels require registration with WDOE and a new source review per WAC 173-400-110 | > 3 SFR/EQ; or A new source review reveals: – Major source (potential for emission of 100 tons of any regulated pollutant); or – Potential to emit 25% of a significant emission as defined in WAC 173-400-030; or– Pollutants will be emitted which will affect an area that is in nonattainment of National Ambient Air Quality Standards (WAC 173-400-030 and 173-400-113); or– Hazardous pollutants (per WAC 173-400-075, and 40 CFR, Part 61) will be emitted |
| (Note: Emissions standards in Chapter 173-400 WAC may not be exceeded) |
Class I areas (national parks, or national wilderness areas) | No visibility impairment | No visibility impairment | Emissions contribute to any visibility impairment |
Airport visibility | No visibility reduction | No visibility reduction | Emissions increase or promote haze or fog |
Scenic open space, and scenic viewpoints or view corridors identified on open space maps | No discernable change | Minor effect on visibility (sight distance, contrast, or color) or scenic qualities | Materially reduces visibility (sight distance, contrast, or color) or scenic qualities |
Scenic and property value impacts from personal wireless service facilities (also see lighting section below). | Facility within height limit of land use designation or disguised or camouflaged as an allowable exemption to the height standard. | Facility ≤ 75 feet, exceeding height limit of land use designation and not disguised as an allowable exemption to the height standard. | Facility > 75 feet that is not disguised or camouflaged as an allowable exemption to the height standard |
Groundwater Pollution |
Groundwater pollutants | No measurable discharge of pollutants to groundwater | | The cumulative pollutant load will exceed early warning values (if established per WAC 173-200-070); or |
| (Note: The most stringent of the following criteria may not be exceeded: |
Adopted watershed or other plan with groundwater prescriptions | In conformance with requirements and guidelines of adopted plan | Not conforming with guidelines (i.e., measures recom-mended but that exceed requirements) | Not conforming with requirements set forth in the adopted plan |
Groundwater in national and state parks and national wildlife refuges | No degradation | No degradation | Any degradation of groundwater quality (WAC 173-200-030) |
Surface Water Pollution |
Surface water pollutants | Not measurable | | |
Nonpoint and stormwater pollution (all applicable best management practices must be in place; WAC 173-201A-160) | Not measurable | | |
| (Note: The maximum criteria in WAC 173-201A-040 for acute and chronic toxicity for fresh water and marine waters may not be exceeded.) |
| | The cumulative deterioration from present condition to the next lower classification < 25% | The cumulative deterioration from present condition to next lower classification ≥ 25% |
| (Note: Minimum standards in WAC 173-201A-030 for turbidity, dissolved oxygen, temperature, pH, coliforms, etc. may not be exceeded) |
Pollutant accumulation in sediment | No accumulation of pollutants | | |
| (Note: The maximum criteria in WAC 173-204-320 through 173-204-340 for pollution of fresh water and marine sediments may not be exceeded.) |
Adopted watershed or other plan | In conformance with requirements and guidelines of adopted plan | Not conforming with guidelines (i.e., measures recom-mended but that exceed requirements) | Not conforming with requirements set forth in the adopted plan |
Total phosphorus entering a lake or reservoir | Concentration < 0.01 mg/Liter | Concentration < 0.05 mg/Liter | Concentration ≥ 0.05 mg/Liter(3) |
Soil Pollution |
Soil Contamination (by the placement or disposal of contaminated fill, soil, spoils, solid waste, contaminated water or other liquids, or other materials or substances)(4) | No detectable wastes governed by WAC 173-303-070 through 173-303-100 and 173-303-120 (including dangerous, extremely hazardous, toxic, infectious, radioactive, ignitable, corrosive, reactive, persistent, or putrescible substances) | One or more of these substances are detectable, and | One or more of these substances are detectable, and |
| (Note: Criteria of Chapter 173-303 WAC may not be exceeded, and all requirements of Chapter 173-303 WAC must be met.) |
Change in soil pH | Change < 0.2 units | Change ≤ 0.5 units | Change > 0.5 units |
Storm Drainage and Erosion |
Runoff increase (equivalent to that produced by indicated amounts of impervious surface) | ≤ 4,000 square feet of total impervious surface area | between 4,000 and 12,000 square feet of total impervious surface area; or between 1,000 and 5,000 square feet of total impervious parking surface area | > 12,000 square feet of total impervious surface area; or > 5,000 square feet of total impervious parking surface area |
Erosion | No measurable changes | More than one acre will be cleared or graded, but potential offsite effects are mitigable | More than 3 acres exposed at one time; or Area has high erosion potential; or Offsite effects are not completely mitigable |
Utilities Usage and Demand |
Solid waste quantity generated (not including waste legally disposed of outside the County) | ≤ average generated by 1 SFR/EQ(2) | ≤ 2 times the average generated by 1 SFR/EQ without mitigation | > 2 times the average generated by 1 SFR/EQ without mitigation |
Sanitary sewerage (demand on community system capacity) | ≤ 1 SFR/EQ demand on system capacity | > 1 SFR/EQ demand on system capacity | Service demand exceeds 3,400 gallons/day |
Water quantity | ≤ the amount required for 1 SFR/EQ | ≤ the amount required for 3 SFR/EQ | > the amount required for 3 SFR/EQ |
Electricity quantity | ≤ the amount required for 1 SFR/EQ | ≤ the amount required for 3 SFR/EQ | > the amount required for 3 SFR/EQ |
Noise and Odor |
Sound level (increase in 1-hour average background sound level in local areas outside the boundary of the project area) | ≤ 2 dBA | ≤ 5 dBA | > 5 dBA; modifiers: extended duration; very low or high frequency; or sharp, penetrating pitch |
Change in odors beyond property boundary | None discernible | Any discernible obnoxious odor | Any discernible obnoxious odor lasting 15 minutes or longer per day |
Traffic(5) |
Passenger vehicle trips generated/day(6) | 5 round trips | 6 to 19 round trips | 20 or more round trips |
Vehicle type (gross vehicle weight = GVW) using road | < 10,000 pounds GVW | < 20,000 pounds GVW | ≥ 20,000 pounds GVW |
Visual Quality |
Lighting(7) | Pathway lighting 36 inches or lower at average 1 foot-candle or less and no direct illumination beyond property boundary | Fixture height > 3 feet; or Average > 1 foot-candles; or Any direct illumination beyond property boundary | Fixture height ≥ 20 feet; or Average > 10 foot-candles; or Any direct illumination beyond property boundary |
Parking | ≤ 2 new spaces | 3 to 9 new spaces | ≥ 10 new spaces |
Visible outdoor storage(8) | ≤ 500 square feet | ≤ 1,000 square feet | ≥ 1,000 square feet |
Lot coverage(9) | ≤ 5,000 square feet | ≤ 10,000 square feet | > 10,000 square feet |
Miscellaneous and Unforeseen Impacts |
[Appropriate parameter] | ≤ 1 SFR/EQ | ≤ 3 SFR/EQ | > 3 SFR/EQ |