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HomeMy WebLinkAboutRS_25103 credit debit scores 344 (2)Wetland name or number A SCORING FORM Scoring functions to calculate mitigation credits and debits in Western Washington Name of wetland (if known); 0 These scores are for: *^ Wetland being altered Mitigation site before Mitigation site after go SUMMARY OF SCORING W<-r A Date of site visit: ^ l® ' Z ^ Scored by , SEC: Jl TWNSHP: 13 RNGE: £ Estimated size: >°'^ Aerial photo included?. mitigation takes place al$ and objectives are met FUNCTION Ir Wa iproving ter Quality Hydrologic Habitat Rating of Site Potential /v\ L u Rating of Landscape Potential M M u Rating of Value N\ u Score Based on Ratings (see table below) 6 3 Wetland HGM Class Used for Rating Depressional „ Riverine Lake-fringe Slope Flats Freshwater Tidal Check if unit has multiple HGM classes present Scores [Order of ratings is not important) 9 = H,H,H 8: I-- 1 6; 5 : 5 = A- 3 : H,H,M H,H,L H,M,M H,M,L M,M,M H,L,L M,M,L M,L,L L,L,L NOTE: Form is not complete without Put only the highest score indicator applies to the unit the figures requested, for a question in each box of the form, even if more than one Do NOT add the scores within a question. Calculating Credits and Debits for Mitigat on in Western WA Scoring Form Final Report March 2012 1 Wetland name or number /V HGM Classification c f Wetlands in Western Washington For questions 1-7 the criteria d< If the hydrologic criteria listed i rated, you probably have a unit hydrologic criteria in questions jscribed must apply to the entire unit being rated. n each question do not apply to the entire unit being with multiple HGM classes. In this case, identify which 1-7 apply, and go to Question 8. 1. Are the water levels in the enti floods)? _ NO- go to|) 1.1 Is the salinity of the wa (parts per thousand)? YES - Freshwater Tid If your wetland can be class Riverine wetlands. If it is S scored. This method canno 2. The entire wetland unit is flat Groundwater andsurface water (T^O^gcTto^) ifybllFwetland can be class wetlands. 3. Does the entire wetland unit n The vegetated part of th water (without any pla At least 30% of the oper t^O^gotaJ^ YES 4. Does the entire wetland unit n The wetland is on a slo The water flows throug usually comes from see without distinct banks. The water leaves the w NOTE: Surface water does very small and shal usually <3 ft diamel NO - go to 5 • 5. Does the entire wetland unit n The unit is in a valley, or flooding from that strea The overbank flooding oi Calculating Credits and Debits for Mitig Scoring Form re unit usually controlled by tides (i.e., except during YES - the wetland class is Tidal Fringe - go to 1.1 ter during periods of annual low flow below 0.5 ppt al Fringe NO - Saltwater Tidal Fringe (Estuarine) ified as a Freshwater Tidal Fringe use the forms for altwater Tidal Fringe it is an Estuarine wetland and not : he used for estuarine wetlands. md precipitation is the only source (>90%) of water to it. •unoff are NOT sources of water to the unit YES - The wetland class is Flats ified as a "Flats" wetland, use the form for Depressional leet all of the following criteria? e wetland is on the shores of a body of permanent open nts on the surface) at least 20 acres (8 ha) in size; water area is deeper than 6.6 ft (2 m)? - The wetland class is Lake-fringe (Lacustrine Fringe) leet all of the following criteria? De [slope can be very gradual), h the wetland in one direction (unidirectional) and ps. It may flow subsurface, as sheetflow, or in a swale etland without being impounded? not pond in these type of wetlands except occasionally in ow depressions or behind hummocks (depressions are er and less than 1 ft deep). YES - The wetland class is Slope »eet all of the following criteria? stream channel, where it gets inundated by overbank m or river xurs at least once eveiy two years. ation in Western WA Final Report March 2012 2 Wetland name or number NOTE: The riverine unit can pontain depressions that are filled with water when the „ liver is,not flooding. ( NO - go to 6^ sorie interior 6. Is the entire wetland unit in a saturated to the surface, at present, is higher than the NO - go to 7 7. Is the entire wetland unit locatjed overbank flooding? The unit unit seems to be maintained ditched, but has no obvious NO - go to 8 topographic depression in which water ponds, or is time during the year? This means that any outlet, if of the wetland. - in a very flat area with no obvious depression and no does not pond surface water more than a few inches. The high groundwater in the area. The wetland may be outlet YES - The wetland class is Depressional by natural ex^m 8. Your wetland unit seems to be different HGM classes. For riverine floodplain, or a small flooding along its sides. GO REGIMES DESCRIBED IN (make a rough sketch to help appropriate class to use for within the wetland unit being NOTE: Use this table only if represents 10% or more of tb the class listed in column 2 is class that represents more tin YES - The wetland class is Riverine TES - The wetland class is Depressiona difficult to classify and probably contains several pie, seeps at the base of a slope may grade into a stream within a depressional wetland has a zone of AND IDENTIFY WHICH OF THE HYDROLOGIC 1-7 APPLY TO DIFFERENT AREAS IN THE UNIT 3^ou decide). Use the following table to identify the rating system if you have several HGM classes present scored. the class that is recommended in the second column e total area of the wetland unit being rated. If the area of less than 10% of the unit; classify the wetland using the n 90% of the total area. BACK QUESTIONS P3f< thfe HGM Classes Within the Being Ratet Wetland Unit 1 HGM Class to Use in Rating Slope + River ne Riverine Slope + Depress ional Depressional Slope + Lake-fr inge Lake-fringe Depressional + Riverine within boundary of c along stream epression Depressional Depressional + Lak e-fringe Depressional Riverine + Lake-ringe Riverine Salt Water Tidal Fringe i class of freshwater md any other wetland Treat as ESTUARINE If you are still unable to t wetland, or if you have m classify the \ letermine which of the above criteria apply to your ire than 2 HGM classes within a wetland boundary, vetland as Depressional for the rating. Calculating Credits and Debits for Mitigation in Western WA Final Report March 2012 3 Scoring Form Wetland name or number Depr essional and Flats Wetlands er quality. WATER QUALITY FUNCTIONS - Questions D 1.1 - D 1,4 are from tl Indicators that the site functions to improve wat e Wetland Rating System (Hruby 2004b). er quality. D 1.0 Does the wetland unit have the potential to improve water quality? D 1.1 Characteristics of surface water Provii Unit is a depression with no s Unit has an intermittently flov outlet Unit has an unconstricted, or: flowing) Unit is a "flat" depression (Q.' surface outflow and no obvic ditch (If ditch is not permanently flowing ti flows out of the wetland: ie photo or drawing irface water leaving it (no outlet) pojnts^^ ving, OR highly constricted permanently flowing points = 2 ;lightly constricted, surface outlet [permanently points = 1 7 on key), or in the Flats class, with permanent us natural outlet and/or outlet is a man-made points = 1 eat unit as "intermittently flowing") Figure 3 D 1.2 The soil 2 inches below the surf definitions) YES: points = 4 ace (or duff layer) is clay or organic (use NRCS $IC^omts = o3 D 1.3 Characteristics of persistent pla Provide map Wetland has persistent, ungrazed, pla Wetland has persistent, ungrazed, pla Wetland has persistent, ungrazed pla Wetland has persistent, ungrazed pla nts (emergent, shrub, and/or forest Cowardin class i of Cowardin plant classes nts > 95% of area points = 5 nts > 1/2 of area CeoJrits^=~3^> its > 1/10 of area points = 1 its <1/10 of area points = 0 Figure D 1.4 Characteristics of seasonal pone Provide This is the area of the wetland unit th sometime during the year. Do not coi area as the average condition 5 out of Area seasonally ponded is > Yi total a Area seasonally ponded is > total a Area seasonally ponded is < % total a ling or inundation. map of hydroperiods at is ponded for at least 2 months, but dries out mt the area that is permanently ponded. Estimate 10 yrs. -ea of wetland (joints = 4 ) "ea of wetland points = 2 •ea of wetland points = 0 Figure Total for D 1 Add the points in the boxes above NOTES and FIELD OBSERVATION 0-5 = 1. M Record the rating on the first page Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 4 Wetland name or number ^\ D 2.0 Does the landscape have the potential to support the water quality function at the site? DJJ..1 Does the Wetland unit receive s|oi -mwater discharges? (Ye7=T>Jo = D 2,2 Is more than 10% of the area w thin 150 ft of wetland unit in agricultural, pasture, residential, commercial, or urban? Yes o D 2,3 Are there septic systems within 0/ 250 ft of the wetland unit? Yes = l No: o D 2.4 Are there other sources of pollujtants coming into the wetland that are not listed in questions D 2.1 - D 2.3? Souice Yes = 1 Total for D 2 Add the points in the boxes above Rating of Landscape Potential: If sjrore is 3 or 4 = H 1 or 2 = M 0 = L Record the rating on the first page D 3.0 Is the water quality improvement provided by the site valuable to society? D 3.1 Does the unit discharge directly list? to a stream, river, or lake that is on the 303d Yes = 1 Qvio^jP o D 3.2 Is the unit in a basin or sub-bas list? n where an aquatic resource is on the 303(d) (fe7=^>No = 0 I D 3.3 Has the site been identified in a maintaining water quality? [an. unit is found) C<0> watershed or local plan as important for ;wer YES if there is a TMDLfor the basin in which Yes = 2 No Q Total for D 3 Add the points in the boxes above ! Rating of Value: If score is 2-4 = H 1 = M M 0 = L Record the rating on the first page NOTES and FIELD OBSERVATIONS: Calculating Credits and Debits for Mitigajtion in Western WA Scoring Form Final Report March 2012 5 Wetland name or number Depr HYDROLOGIC FUNCTIONS - Questions D 4.1 - D 4.3 are from \ essionai and Flats Wetlands ndicators that the site functions to reduce flooding and stream degradation. retland Rating System (Hruby 2004b). D 4.0 Does the wetland unit have the potential to reduce flooding and erosion? D 4.1 Characteristics of surface water Unit is a depression with no sur Unit has an intermittently flowi outlet Unit is a "flat" depression (Q. 7 surface outflow and no obvio ditch Unit has an unconstricted, or sli permanently flowing) (If ditch is not permanently flowing d flows out of the wetland: face water leaving it (no outlet) joints =~3\ ig OR highly constricted permanently flowtrrg-~ points = 2 m key), or in the Flats class, with permanent us natural outlet and/or outlet is a man-made points = 1 ^htly constricted, surface outlet and is points = 0 eat unit as "intermittently flowing") H D 4.2 Depth of storage during wet per Estimate the height of ponding abov measure from the surface Oj Marks of ponding are 3 ft or mo The wetland is a "headwater" w Marks of ponding between 2 ft t Marks are at least 0.5 ft to < 2 ft Unit is flat (yes to Q. 2 or Q. 7 or trap water Marks of ponding less than 0.5 1 iods e the bottom of the outlet For units with no outlet "permanent water or deepest part (if dry]. re above the surface or bottom of outlet points = 7 etland" points = 5 o < 3 ft from surface or bottom of outlet points = 5 from surface or bottom of outlet points = 3 key) but has small depressions on the surface that points = 1 t Ciipints = u) o D 4.3 Contribution of wetland unit to jstorage in the watershed Estimate the ratio of the area of upstream basin contributing surface water to the wetland to the area\ofthe wetland unit itself. The area of the basin is less tha^ 10 times the area of the unit points = 5 The area of the basin is 10 to 100 times the area of the unit poiats_^3 The area of the basin is more th^n 100 times the area of the unit ( pninrs = CD Entire unit is in the FLATS class points = 5 CD Total for D 4 Add the points in the boxes above Rating of Site Potential: If score is 12 - 16 = H 6-ll = M t~ Record the rating on the first page NOTES and FIELD OBSERVATIONS: Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 6 Wetland name or number. A- D 5.0 Does the landscape have the potential to support hydrologic functions at the site? 1 D 5.1 Does the unit receive any storm(water discharges? (Xgs_5J^o = 0 f D5.2 Is >10% of the land use within 150 ft of the wetland unit agriculture, pasture, residential, urban, or commercial? r^Tesj=J^No = 0 / D 5.3 Is more than 25% of the contributing basin of the wetland unit covered with intensive human land uses (residential at >1 residence/1 acre, urban, commercial, agriculture, etc.)? Yes = l'CNo=^ O Total for D 5 Add the points in the boxes above 2~ Rating of Landscape Potential: If score is 3 = H 0 = L Record the rating on the first page D 6.0 Are the hydrologic functions provided by the site valuable to society? D 6.1 The unit is in a landscape that has Choose the description that best matches rated. Do not add points. Choose the flooding problems, conditions around the wetland unit being highest score if more than one condition is met. • The site has been identified as important for flood storage or flood conveyance in a regional flood control plan. points = 2 • The wetland captures surface water that would otherwise flow downgradient into areas where flooding has damaged human or natural resources (e.g., salmon redds), AND o Damage occurs in sub-basin that is immediately down-gradient of unit, points = 2 o Damage occurs in a sub-basi^i further down-gradient. points= 1 • Flooding from groundwater is ajn issue in the sub-basin. (fnoints =T^ • The existing or potential outflo\f' from the wetland is so constrained by human or natural conditions that the wate|r stored by the wetland cannot reach areas that flood. Explain why ! points = 0 • There are no problems with flocjiding downstream of the unit. points = 0 Rating of Value: If s<fore is 2 = H Record the rating on the first page NOTES and FIELD OBSERVATIONS: Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 7 Wetland name or number. A- These questioi HABITAT FUNCTIONS - Indicate Questions H 1.1 - H 1.5 are from V s apply to wetlands of all HGM classes. rs that site functions to provide important habitat Zetland Rating System (Hruby 2004b). H 1. Does the wetland unit have the p atential to provide habitat for manv species? H 1.1 Structure of plant community - Check the Cowardin plant classes in u than 10% of the unit if it is smaller tha indicators are Cowardin classes and layers in forest nit - Polygons for each class must total V\ or more n 2.5 acres. Figure_ Provide map of Cowardin plant classes Acjuatic bed ^/Emergent plants Scrub/shrub (areas where; shrubs have > 30% cover) Forested (areas where tre0s have > 30% cover) If the unit has a forested class check if: The forested class has 3 oi|t of 5 strata (canopy, sub-canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20% within the forested polygon Add the number of structures checked. If you have: 4 structures or more points = 4 3 structures points = 2 2 structures points = 1 1 structure joints H 1.2. Hydroperiods Check the types of water regimes (hydroperiods) present within the wetland. The water regime has to cover more than 10% ojf the wetland or % acre to count [see text for descriptions of hydroperiods). Provide map of polygons with different hydroperiods Permanently flooded or inundated 4 or more types present points = 3 _j/Seasonally flooded or inundated 3 types present points = 2 Occasionally flooded or inuncjated 2 types present points = 1 Saturated only 1 type present <£o^tsj=0^) Permanently flowing stream or river in, or adjacent to, the wetland Seasonally flowing stream in, or adjacent to, the wetland Lake-fringe wetland = 2 points Freshwater tidal wetland = 2 points H 1.3. Richness of Plant Species Count the number of plant species in t.he wetland unit that cover at least 10 ft2. Different patches of the same species can be combined to meet the size threshold and you do not have to name the species. Do not include Eurasian Milfoil, reed canarygrass, purple loosestrife, Canadian Thistle if you counted: List species below if you want to: > 19 species 5 - 19 species < 5 species points = 2 Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 17 Wetland name or number A H 1.4. Interspersion of habitats Figure_ Decide from the diagrams below whether! interspersion between Cowardin plants classes (described in H 1.1), or the classes and uhvegetated areas (can include open water or mudflats) is high, medium, low, or none. Provide map of Cowardin plant classes (same as Hl.l) 0(0) (M) (SD ^Ntihe =^rJpoints^) Low = 1 point Moderate = 2 points *r [riparian braided channels with 2 classes] High = 3 points O NOTE: If you have four or more classes of three plants classes and open water the rating is O always "high." H 1.5. Special Habitat Features: Check the habitat features that are present in the wetland. The number of checks is the number of points you put into the next column. Large, downed, woody debris within t|ie unit (>4 inches diameter and 6 ft long). Standing snags (diameter at the bottom > 4 inches) within the unit Undercut banks are present for at least 6.6 ft (2m) and/or overhanging plants extends at least 3.3 ft (lm) over a stream (or dh}ch) in, or contiguous with the unit, for at least 33 ft (10m) Stable steep banks of fine material that might be used by beaver or muskrat for denning (>30degree slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet weathered where wdod is exposed) At least XA acre of thin-stemmed persistent plants or woody branches are present in areas that are permanently or seasonally inundated.(structures for egg-laying by amphibians) Invasive plants cover less than 25% ofj the wetland area in every stratum of plants (see H 1.1 for list of strata) H 1. TOTAL Score - potential for providing habitat Ad(\e scores from H 1.1, H 1.2, H 1.3, H 1.4, and H 1.5 Rating of Site Potential: If score is 15 - 18 = H L 7-14 = M L Co-6 =T^ Record the rating on the first page Calculating Credits and Debits for Mitigation in Western WA Final Report March 2012 18 Scoring Form Wetland name or number H 2.0 Does the landscape have the potential to support habitat at the site? H 2.1 Accessible habitat (include only habitat that directly abuts wetland unit). Calculate: 2- % undisturbed habitat + [(H moderate and low intensity land uses)/2] = ^ Provide map of land use within 1 km of unit edge If total accessible habitat is: > 1/3 (33.3%J of 1 km circle (-100 hectares or 250 acres) points = 3 20 - 33% of 1 km circle points = 2 10 -19% of 1 km circle points_=l <10% of 1 km circle (polnts^J^ Figure_ O H 2.2 Undisturbed habitat in 1 km circle around unit If: Undisturbed habitat > 50% of circle points = 3 Undisturbed habitat 10 - 50% and in 1-3 patches points = 2 Undisturbed habitat 10 - 30% and > 3 patches CRglnfs"^> Undisturbed habitat < 10^o of circle points = 0 ! H 2.3 Land use intensity in 1 km circle. If: _ > 50% of circle is high intensity land use C points = (- 2_0 Does not meet criterion above points = 0 - ? Total for H 2 Add the points in the boxes above — 1 Rating of Landscape Potential: If score is 4- 6 = H 1-3 = M Record the rating on the first page H 3.0 Is the Habitat provided by the site valuable to society? H3.1Does the site provides habitat for spejcies valued in laws, regulations or policies? (choose only the highest score) Site meets ANY of the following criteria: points = 2 — It provides habitat for Threatened or Endangered species (any plant or animal on the state or federal lists] — It is a "priority area" for ap individual WDFW species — It is a Natural Heritage Sit^ as determined by the Department of Natural Resources — It scores 4 on question H2,3 of the wetland rating system — It has been categorized as an important habitat site in a local or regional comprehensive plan, in a Sihoreline Master Plan, or in a watershed plan Site scores 1-3 on question H2.3 of the wetland rating system points = 1 Site does not meet any of the criteria aboye Cgpints^-?5 Rating of Value: If score is 2 = H 1 = M L~ Record the rating on the first page Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 19 Wetland name or number SCORING FORM Scoring functions to calculate mitigation credits and debits in Western Washington Name of wetland (if known): t/'r"^ ^J Date of site visit: Scored by. SEC: TWNSHP: RNGE: Estimated size: Aerial photo included?. These sxpfes are for: <S .Wetland being altered .Mitigation site before mitigation takes place .Mitigation site after goals and objectives are met SUMMARY OF SCORING FUNCTION Improving Water Quality Hydrologic Habitat Rating of Site Potential L Rating of Landscape Potential M u Rating of Value r\ Score Based on Ratings (see table below) 3 Wetland HGM Class Used for Rating Depressional S Riverine Lake-fringe Slope Flats Freshwater Tidal Check if unit has multiple HGM classes present Scores (Order of ratings is not important) 9 = H,H,H 8 = H,H,M 7 = H,H,L 7 = H,M,M 6 = H,M,L 6 = M,M,M 5 = H,L,L 5 = M,M,L 4 = M,L,L 3 = L,L,L NOTE: Form is not complete without the figures requested. Put only the highest score for a question in each box of the form, even if more than one indicator applies to the unit Do NOT add the scores within a question. Calculating Credits and Debits for Mitigation in Western WA Final Report March 2012 1 Scoring Form Wetland name or number ^ HGM Classification of Wetlands in Western Washington For questions 1-7 the criteria If the hydrologic criteria listed i rated, you probably have a unit hydrologic criteria in questions described must apply to the entire unit being rated. it each question do not apply to the entire unit bei ng ^vith multiple HGM classes. In this case, identify which -7 apply, and go to Question 8. 1. Are the water levels in the entire unit usually controlled by tides (i.e., except during floods)? JO- go toj^ YES - the wetland class is Tidal Fringe - go to 1.1 1.1 Is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? YES - Freshwater Tidal Fringe NO - Saltwater Tidal Fringe (Estuarine) If your wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Saltwater Tidal Fringe it is an Estuarine wetland and not scored. This method cannot be used for estuarine wetlands. 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundj^terandsurface water rimoff are NOT sources of water to the unit "NO - goJoIS5^ YES - The wetland class is Flats Tufwetland can be classified as a "Flats" wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet all of the following criteria? The vegetated part of the; wetland is on the shores of a body of permanent open water (without any plants on the surface) at least 20 acres (8 ha) in size; At least 30% of the open Water area is deeper than 6.6 ft (2 m)? NO - goj5j$> YES -* The wetland class is Lake-fringe (Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? The wetland is on a slop£ [slope can be very gradual), The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banks. The water leaves the wetland without being impounded? NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually <3 ft diameter and less than 1 ft deep). QjN 0 - go toJjJ> YES - The wetland class is Slope 5. Does the entire wetland unit meet all of the following criteria? The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that stream or river The overbank flooding occurs at least once every two years. Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 2 Wetland name or number NOTE: The riverine unit can contain depressions that are filled with water when the - riverjs not flooding. (NO - go toj) YES - The wetland class is Riverine 6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at some time during the year? This means that any outlet, if present, is higher than the interior of the wetland. — —Z5y NO - go to 7 YI,Sj-__TJie wetland class is Depressional j 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding? The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet NO - go to 8 YES - The wetland class is Depressional 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM classes. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPLY TO DIFFERENT AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within the wetland unit being scored. NOTE: Use this table only if the class that is recommended in the second column represents 10% or more of the total area of the wetland unit being rated. If the area of the class listed in column 2 is less than 10% of the unit; classify the wetland using the class that represents more than 90% of the total area. HGM Classes Within the Wetland Unit Being Rated HGM Class to Use in Rating Slope + Riverine Riverine Slope + Depressional Depressional Slope + Lake-fringe Lake-fringe Depressional + Riverine along stream within boundary of depression Depressional Depressional + Lake-fringe Depressional Riverine + Lake-fringe Riverine Salt Water Tidal Fringe and any other class of freshwater wetland Treat as ESTUARINE If you are still unable to determine which of the above criteria apply to your wetland, or if you have mare than 2 HGM classes within a wetland boundary, classify the Wetland as Depressional for the rating. Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 3 Wetland name or number Pepr WATER QUALITY FUNCTIONS - Questions D 1.1 - D 1.4 are from tl essjonal and Flats Wetlands Indicators that the site functions to improve water quality, le Wetland Rating System (Hruby 2004b). D 1.0 Does the wetland unit have the potential to improve water qualitv? D 1.1 Characteristics of surface water flows out of the wetland: Provide photo or drawing Unit is a depression with no surface water leaving it (no outlet} point£=3^3 Unit has an intermittently flowing, OR highly constricted permanently flowing outlet points = 2 Unit has an unconstricted, or slightly constricted, surface outlet [permanently flowing) points = 1 Unit is a "flat" depression (Q. 7 on key), or in the Flats class, with permanent surface outflow and no obvious natural outlet and/or outlet is a man-made ditch points = 1 (If ditch is not permanently flowing treat unit as "intermittently flowing") Figure 3 D 1.2 The soil 2 inches below the surface (or duff layer) is clay or organic (use NRCS definitions) YES: points = 4 (NO: points ^Q) D 1.3 Characteristics of persistent plants (emergent, shrub, and/or forest Cowardin class Provide map of Cowardin plant classes Wetland has persistent, ungrazed, plants > 95% of area points = fj Wetland has persistent, ungrazed, plants > 1/2 of area (^points_^3v Wetland has persistent, ungrazed plants > 1/10 of area points = 1 Wetland has persistent, ungrazed plants <1/10 of area points = 0 Figure D 1.4 Characteristics of seasonal ponding or inundation. Provide map of hydroperiods This is the area of the wetland unit that is ponded for at least 2 months, but dries out sometime during the year. Do not count the area that is permanently ponded. Estimate area as the average condition 5 out of 10 yrs. Area seasonally pnnded is > V> fntal area nf wptlanrl C poin^=T*55 Area seasonally ponded is > % total area of wetland points = 2 Area seasonally ponded is < % total area of wetland points = 0 Figure H Total for D 1 Add the points in the boxes above Rating of Site Potential: If score is 12 - 16 = H M Record the rating on the first page NOTES and FIELD OBSERVATIONS: Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 4 Wetland name or number 3 D 2.0 Does the landscape have the potential to support the water quality function at the site? D 2.1 Does the Wetland unit receive stormwater discharges? 0 Yes = lCNo O D 2.2 Is more than 10% of the area within 150 ft of wetland unit in agricultural, nasiure, residential, commercial, or urban? Yes (=2>Jo = 0 D 2.3 Are there septic systems within 250 ft of the wetland unit? 0 Yes = l No; C> D 2.4 Are there other sources of pollutants coming into the wetiand that are not listed in questions D 2.1 - D 2.3? Source Yes = 1 Total for D 2 Add the points in the boxes above Rating of Landscape Potential: If score is^-oi^t^H^^ <Clor2 = Mj} 0 = L Record the rating on the first page D 3.0 Is the water quality improvement provided by the site valuable to society? D 3.1 Does the unit discharge directly to a stream, river, or lake that is on the 303d list? Yes = 1 [No=jJ D 3.2 Is the unit in a basin or sub-basin where an aquatic resource is on the 303(d) list? D 3.3 Has the site been identified in a watershed or local plan as important for maintaining water quality? [answer YES if there is a TMDLfor the basin in which unit is found) Yes C2 No^; = 0 O Total for D 3 Add the points in the boxes above Rating of Value: If score is 2-4 - H 0 = L Record the rating on the first page NOTES and FIELD OBSERVATIONS: Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 5 Wetland name or number 3 Depressional and Flats Wetlands HYDROLOGIC FUNCTIONS Questions D 4.1 - D 4.3 are from Indicators that the site functions to reduce flooding and stream degradation, etiand Rating System (Hruby 2004b). D 4.0 Does the wetland unit have the potential to reduce flooding and erosion? i D 4.1 Characteristics of surface water flows out of the wetland: Unit is a depression with no surface water leaving it (no outlet) <^polrvts='4^' Unit has an intermittently flowing OR highly constricted permanently flowing outlet points = 2 Unit is a "flat" depression (Q. 7 on key), or in the Flats class, with permanent surface outflow and no obvious natural outlet and/or outlet is a man-made ditch points = 1 Unit has an unconstricted, or slightly constricted, surface outlet and is permanently flowing) points = 0 (If ditch is not permanentiy flowing treat unit as "intermittently flowing") D 4.2 Depth of storage during wet periods Estimate the height of ponding above the bottom of the outlet For units with no outlet measure from the surface of permanent water or deepest part (if dry). Marks of ponding are 3 ft or more above the surface or bottom of outlet points = 7 The wetiand is a "headwater" wetland" points = 5 Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points = 5 Marks are at least 0.5 ft to < 2 ft from surface or bottom of outlet points = 3 Unit is flat (yes to Q. 2 or Q. 7 on key) but has small depressions on the surface that trap water points^l Marks of ponding less than 0.5 ft points, = o -« a D 4.3 Contribution of wetland unit to storage in the watershed Estimate the ratio of the area of upstream basin contributing surface water to the wetland to the area of the wetland unit itself. The area of the basin is less than 10 times the area of the unit points = 5 The area of the basin is 10 to 100 times the area of the unit points = 3 The area of the basin is more than 100 times the area of the unit (joints = 0^ Entire unit is in the FLATS class points = 5 o Total for D 4 Add the points in the boxes above H Rating of Site Potential: If score is 12 - 16 = H 6-11 = M Record the rating on the first page NOTES and FIELD OBSERVATIONS: Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 6 Wetland name or number D 5.0 Does the landscape have the po tential to support hydrologic functions at the site? D 5.1 Does the unit receive any stormwater discharges? Yes = £^Nci~=J)) D5.2 Is >10% of the land use within 150 ft of the wetland unit agriculture^j^sfjjre, residential, urban, or commercial? Qfes_^jLxNo = 0 ( D 5.3 Is more than 25% of the contributing basin of the wetland unit covered with intensive human land uses (residential at >1 residence/1 acre, urbaji^jrjjmmercial, agriculture, etc.)? (Yes 5^No = 0 ( Total for D 5 Add the points in the boxes above Rating of Landscape Potential: If score is 3 = H 0 = L Record the rating on the first page D 6.0 Are the hydrologic functions pr ovided by the site valuable to society? D 6.1 The unit is in a landscape that has flooding problems. Choose the description that best matches conditions around the wetland unit being rated. Do not add points. Choose the highest score if more than one condition is met • The site has been identified as important for flood storage or flood conveyance in a regional flood control plan. points = 2 • The wetland captures surface water that would otherwise flow downgradient into areas where flooding has damaged human or natural resources (e.g., salmon redds), AND 0 Damage occurs in sub-basin that is immediately down-gradient of unit points = 2 0 Damage occurs in a sub-basin further down-gradient. points = 1 • Flooding from groundwater is an issue in the sub-basin. ("points^!) • The existing or potential outflow from the wetland is so constrained by nurnafTor natural conditions that the water stored by the wetland cannot reach areas that flood. Explain whv points = 0 • There are no problems with flooding downstream of the unit. points = 0 Rating of Value: If score is 2 = H 0 = L Record the rating on the first page NOTES and FIELD OBSERVATIONS: Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 7 Wetland name or number These questions apply to wetlands of all HGM classes. HABITAT FUNCTIONS - Indicators that site functions to provide important habitat Questions H 1.1 - H 1.5 are from Wetland Rating System fHruby 2004b). H 1. Does the wetland unit have the potential to provide habitat for manv species? H 1.1 Structure of plant community - indicators are Cowardin classes and layers in forest Check the Cowardin plant classes in unit - Polygons for each class must total % acre, or more than 10% of the unit if it is smaller than 2.5 acres. Provide map of Cowardin plant classes Aquatic bed Emergent plants Scrub/shrub (areas where shrubs have > 30% cover) Forested (areas where trees have > 30% cover) If the unit has a forested class check if: The forested class has 3 out of 5 strata (canopy, sub-canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20% within the forested polygon Add the number of structures checked. If you have: 4 structures or more points = 4 3 structures points = 2 2 structures points = 1 1 structure V points = JL, Figure_ H 1.2. Hydroperiods Check the types of water regimes (hydroperiods) present within the wetland. The water regime has to cover more than 10% of the wetland or % acre to count (see text for descriptions of hydroperiods). Provide map of polygons with different hydroperiods Permanently flooded or inundated 4 or more types present points = 3 _j/Seasonally flooded or inundated 3 types present points = 2 Occasionally flooded or inundated 2 types present points = 1 Saturated only 1 type present ("poInts=jD Permanently flowing stream or river in, or adjacent to, the wetland Seasonally flowing stream in, or adjacent to, the wetland Lake-fringe wetland = 2 points Freshwater tidal wetland = 2 points Figure_ H 1.3. Richness of Plant Species Count the number of plant species in the wetland unit that cover at least 10 ft2. Different patches of the same species can be combined to meet the size threshold and you do not have to name the species. Do not include Eurasian Milfoil, reed canarygrass, purple loosestrife, Canadian Thistle If you counted: > 19 species points = 2 List species below if you want to: 5 - 19 species points = 1 < 5 species Vp_oints = 0""^J) Calculating Credits and Debits for Mitigation in Western WA Final Report March 2012 17 Scoring Form Wetland name or number JZ> H 1.4. Interspersion of habitats Decide from the diagrams below whether interspersion between Cowardin plants classes (described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats) is high, medium, low, or none. Provide map of Cowardin plant classes (same as Hl.l) [riparian braided channels with 2 classes] High = 3 points NOTE: If you have four or more classes or three plants classes and open water the rating is always "high." Figure_ H 1.5. Special Habitat Features: Check the habitat features that are present in the wetland. The number of checks is the number of points you put into the next column. Large, downed, woody debris within the unit (>4 inches diameter and 6 ft long). Standing snags (diameter at the bottom > 4 inches) within the unit Undercut banks are present for at least 6.6 ft (2m) and/or overhanging plants extends at least 3.3 ft (lm) over a stream (or ditch) in, or contiguous with the unit, for at least 33 ft (10m) Stable steep banks of fine material that might be used by beaver or muskrat for denning (>30degree slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet weathered where wood is exposed) At least % acre of thin-stemmed persistent plants or woody branches are present in areas that are permanently or seasonally inundated.(structures/or egg-laying by amphibians) Invasive plants cover less than 25% of the wetland area in every stratum of plants (see H 1.1 for list of strata) H 1. TOTAL Score - potential for providing habitat Add the scores from H 1.1, H 1.2, H 1.3, H 1.4, and H 1.5 Rating of Site Potential: If score is 15-18 = H 7 - 14 = M Record the rating on the first page Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 18 s Wetland name or number H 2.0 Does the landscape have the potential to support habitat at the site? H 2.1 Accessible habitat [include only habitat that directly abuts wetland unit). Calculate: 2—. % undisturbed habitat + [(% moderate and low intensity land usesl/2] = Provide map of land use within 1 km of unit edge If total accessible habitat is: > 1/3 (33.3%) of 1 km circle (~100 hectares or 250 acres] points = 3 20- 33% of 1 km circle points = 2 10 -19% of 1 km circle p.pim^=,l <10% of 1 km circle WQJ&=JO Figure_ o H 2.2 Undisturbed habitat in 1 km circle around unit If: Undisturbed habitat > 50% of circle Undisturbed habitat 10 - 50% and in 1-3 patches Undisturbed habitat 10 - 50% and > 3 patches Undisturbed habitat < 10% of circle points = 3 pojnts^2^ (points points = U / H 2.3 Land use intensity in 1 km circle. If: > 50% of circle is high intensity land use ( Does not meet criterion above points = (- potnts~~="0 ' ' T Total for H 2 Add the points in the boxes above Rating of Landscape Potential: If score is 4- 6 = H u Record the rating on the first page H 3.0 Is the Habitat provided by the site Valuable to society? H3.1Does the site provides habitat for species valued in laws, regulations or policies? (choose only the highest score) Site meets ANY of the following criteria: points = 2 — It provides habitat for Threatened or Endangered species (any plant or animal on the state or federal lists) — It is a "priority area" for an individual WDFW species — It is a Natural Heritage Site as determined by the Department of Natural Resources — It scores 4 on question H2.3 of the wetland rating system — It has been categorized as an important habitat site in a local or regional comprehensive plan, in a Shoreline Master Plan, or in a watershed plan Site scores 1-3 on question H2.3 of the wetland rating system Site does not meet any of the criteria above points = 1 points = 0 C3 Rating of Value: If score is 2 = H 1 = M U Record the rating on the first page Calculating Credits and Debits for Mitigation in Western WA Scoring Form Final Report March 2012 19