HomeMy WebLinkAboutRestoration Plan - PLN General - 2/20/2007 RESTORATION PLAN
PROJECT SITE:
1290 EAST MASON LAKE DRIVE SOUTH
MASON COUNTY, WASHINGTON
Prepared for:
Mr. Don Bocksch
10923 Tilly Road South
Olympia, Washington 98512
Prepared By:
AGUA TIERRA
LAND AND WATER SERVICES, INC (AGUA TIERRA)
Rivers Wetlands Lakes Marine Shorelines Slopes
- - - - - - - - - - - -
a design — build firm specializing in environmental critical areas
Assess - Permit - Design - Restore - Build
February 2007
1.0 INTRODUCTION/EXECUTIVE SUMMARY
Agua Tierra Land and Water Services, Inc. (Agua Tierra)prepared this Restoration Plan(Plan)for the
subject parcel as part of a settlement with Mason County(County) for unpermitted development within
the Fish and Wildlife Habitat Conservation Area(FWHCA) of Mason Lake. Unpermitted construction
included landscape retaining walls,patio, stairs,handrails and demolition of a pre-existing deck.
Settlement documents submitted to the County include:
• This Restoration Plan(with attached drawings);
• Engineering evaluation of retaining walls;
• Environmental Permit(DARPA Shoreline Conditional Use); and
• Building permit and supporting construction plans.
The following restoration work is established by the settlement aggreement:
• Partial wall removal;
• Partial patio removal;
• Earth fill placement for engineering and restoration; and
• Native plant/habitat restoration.
All supporting figures can be found in Attachments.
1.2 PROJECT LOCATION
The project location is described below.
• Site Address: 1290 East Mason Lake Drive South,Mason County,Washington
• Legal: T22N,R1 W, Section 07(W.M.)
• County/Parcel: Mason/22107-500-0046
• Size: 0.16 Acres
• Protected Resource: Mason Lake(Type 1 (S)Lake shoreline)
1.3 REGULATORY AUTHORITY
Mason County regulates Mason Lake through Mason County Resource Ordinance—Fish&Wildlife
Habitat Conservation Areas 17.01.040. Mason County Fish and Wildlife Habitat Conservation Area
(FWHCA)buffers and building setbacks are listed below. Buffers and building setbacks are measured in
a landward direction from Ordinary High Water Mark(OHWM).
Applicable habitat type/s and buffers for this project appear in italics in the following table.
Habitat Type(Permanent Habitat Type(Interim Buffer Width Additional Building
Water Typing System) Water Typing System) (ft) Setback from Buffer(ft)
Type-S Stream Type-1 Stream 150 15
Type-F Stream Type-2 Stream 150 15
Type-F Stream Type-3 Stream 150 15
Type-Np Stream Type-4 Stream 100 15
Type-Ns Stream Type-5 Stream 75 15
Type-1 Saltwater and Lake 100 or common
Ty e-S Water Shorelines line 0
Type-1 Conservancy
Saltwater and Lake
T e S+ Water Shorelines 100 15
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2.0 PRE-EXISTING SITE DESCRIPTION
Pre-existing site development included:
• Single Family Residence;
• Garage;
• Patio;
• Bulkhead;
• Low landscape retaining walls;
• Concrete stairs;
• Decks; and
• Walkways.
Existing adjoining land use:
• Forested and rural residential.
2.1 EXISTING TOPOGRAPHY
The entire property slopes moderately toward the shoreline of Mason Lake.
2.2 EXISTING SOILS
Soils for the study area are mapped on the website: websoilsurvey.nres.usda.gov. Mapping shows soil
series:
• Alderwood Gravelly Sandy Loam(non-hydric well-drained)with 5-15 percent slopes.
2.3 EXISTING VEGETATION
The entire area between the shoreline and the residence and patio area is dominated by non-native grasses
and small landscaped areas containing ornamental shrub vegetation. The remainder of the property is
dominated by Douglas-fir(Pseudotsuga menziesii), evergreen huckleberry(Vaccinium ovatum), sword
fern (Polystichum munitum), and salal (Gaultheria shallon).
2.4 PROTECTED WILDLIFE SPECIES INFORMATION
A check list for Species of Importance That May Occur in Mason County is included in the Attachments
section. No species on this list were observed the day of fieldwork. No species on the list were identified
as being documented in the vicinity of the project during a literature and website review.
3.0 PROPOSED RESTORATION WORK
New/proposed land use modifications in this restoration proposal include:
• Partial removal of an unpermitted retaining wall;
• Construction of 24' landscape retaining walls;
• Partial removal of patio;
• Earthwork and soil amendments; and
• Restoration with native vegetation.
4.0 RESTORATION MEASURES
An overall settlement agreement was reached with the County. Specific restoration work will include:
• Removal of a retaining wall(RW3 on Site Map);
• Replacement of removed wall with a series of low landscaping walls(each not to exceed 24
inches in height)with resulting terraces planted with native vegetation;
• Planting of a vegetative screen along the northern property boundary;
• Installation of native vegetation along the waterward base of other retaining walls;
• Soil fill and vegetation placement in front of Retaining Wall 2 (RW-2);
• Visual screening of taller retaining walls from Mason Lake; and
• Restoration using native plants for wildlife habitat and erosion control.
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4.01 BEST MANAGEMENT PRACTICES (BMP)
In order to avoid and or minimize potential adverse impacts to surrounding areas Best Management
Practices(BMP's)are prescribed. Detailed BMP guidance is provided as an Attachment. Environmental
protection and conservation measures are specified.
4.02 RESTORATION AREA [Approximately 300 Ft'(Min.)]
The Restoration area is located within the Mason Lake FWHCA buffer and shown on the Site Plan in the
Attachments. The Restoration Area is in the northern portion of the property between the keystone
retaining walls and the bulkhead adjoining Mason Lake. Currently the area consists of flat mowed grass.
The existing retaining wall(RW3)will be removed and the grade will be sloped and terraced to near pre-
project conditions.Care will be taken to reestablish the vegetative screen between the subject parcel and
the parcel to the north. Additional habitat features(logs and rocks)will be added opportunistically for
habitat value. For visual screening trellises will be placed on retaining wall faces to support native vines.
4.03 NATIVE VEGETATION
Recommended native plant species quantities,are listed in the table below. Noted quantities are an
estimate based on estimated project impact area,prescribed planting densities and correction factor/s
estimated for existing or retained and salvaged plants(if any).
PLANT MATERIALS TABLE
Strata Species Density Minimum Quantity Notes
(feet on Size
center)
Tree vine maple(Acer circinatum) 10 1 or 2 4 Substitutions with comparable native
gallon vegetation is allowed.
Shrub red osier dogwood(Cornus 5 1 or 2 2 Substitutions with comparable native
stolonifera) gallon vegetation is allowed.
Shrub Pacific rhododendron 5 1 or 2 4 Substitutions with comparable native
(Rhododendron gallon vegetation is allowed.
macro hyllum)
Shrub evergreen huckleberry 5 1 or 2 4 Substitutions with comparable native
(Vaccinium ovatum) gallon vegetation is allowed.
Shrub red elderberry(Sambucus 5 1 or 2 2 Substitutions with comparable native
racemosa) gallon vegetation is allowed.
Vine western trumpet honeysuckle 1 4-8 inch 25 Substitutions with comparable native
(Lonicera ciliosa) vegetation is allowed.
Vine hairy honeysuckle(Lonicera 1 4-8 inch 25 Substitutions with comparable native
hispidula) vegetation is allowed.
Ground sword fern(Polystichum 2 4 inch- 20 Substitutions with comparable native
Cover munitum) 1 gallon vegetation is allowed.
Ground deer fern(Blechnum spicant) 2 4 inch- 20 Substitutions with comparable native
Cover 1 gallon vegetation is allowed_
Ground kinnikinnik(Arctostaphylos 1 4 inch- 30 Substitutions with comparable native
Cover uva-ursi) 1 gallon vegetation is allowed.
Ground Pacific bleeding heart 1 4 inch- 30 Substitutions with comparable native
Cover (Dicentra Formosa) 1 gallon vegetation is allowed.
Ground coastal strawberry(Fragaria 1 4 inch- 30 Substitutions with comparable native
Cover chiloensis) 1 gallon vegetation is allowed.
Planting densities(spacing)will eventually provide a moderately dense, structurally diverse plant
community in the treatment area. Any individual native plants retained within the treatment area may be
4
I
counted towards the specified overall planting densities. Any non-native(weed)vegetation should be
removed.
4.04 LARGE WOODY DEBRIS HABITAT
Dead trees, stumps and fallen timber provide excellent wildlife habitat to a broad range of species(birds,
mammals, reptiles,amphibians and insects). We recommend including downed logs/stumps aesthetically
places as habitat and landscaping features within the restoration area. Ferns grow well in decaying wood
and can be added.
5.0 NATIVE PLANT INSTALLATION METHODS
Please refer to Native Plant Installation Instructions and detail drawings in Attachments.
6.0 GOALS AND PERFORMANCE STANDARDS
Specific objective and performance standards are listed in the table below.
Mitigation Goals and Performance Standards
Item# Objective Performance Standards
Install 300 ft2 of native buffer Professionally install recommended species at the following
1 vegetation. densities:
• Trees: 10/1000 ft2
• Shrubs&Groundcover: 111 / 1000 ft2
Restoration plantings are: • Minimum 80%survive/thrive each year.
2 • Established . Plants achieve healthy,competitive,maintenance
• Self sufficient free condition.
7.0 MONITORING
Monitoring of the site will be required to evaluate the success of the mitigation measures and provide for
amendments to the plan,which may become necessary to achieve its purpose.The client shall provide for
seasonal monitoring of the site by a qualified biologist or other qualified professional. The applicant shall
submit an annual and/or final report as required per ordinance.
Native plantings should be monitored for a minimum of 80% survival and growth of all transplants and
native volunteer substitutes. Mason County Resource Ordinance 17.01.070 requires"annual
monitoring for a minimum of five years and up to ten years or until the department determines that
the mitigation project has achieved success."
8.0 CONTINGENCY PROCEDURES
Contingency actions which may be required could include,but are not limited to,replacement of plants
which have not achieved the standard survival or coverage goals according to the proposed planting
density, substitution of plant species on the plant species list/schedule, irrigation,and amendments to the
restoration/mitigation plan during monitoring as necessary to achieve its purpose.
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9.0 SCHEDULE
The following timeline is designed to achieve the best chances of mitigation success.
SCHEDULE FOR RESTORATION/MITIGATION PLAN
Item# Mitigation Action Proposed Timing
1* Pre-construction site planning meeting(client and restoration Spring/Summer 2007
s ecialist)to identify refinements to final plan and work sequencing.
2 Construction/Installation Spring/Summer 2007
3* Install native plants in Restoration Zone 2007**
4* Installation Report to Agency 2007**
5* 1"year monitoring report October 2008
6* 2° year monitoring report October 2009
7* 3` year monitoring report October 2010
8* 4 year monitoring report October 2011
9* 5 /Final year monitoring report October 2012
* Schedule a site visit with Agua Tierra Restoration Specialist.
** Schedule is dependant on final project timeline.
10.0 CONCLUSION
This Restoration Plan proposes mitigation for unpermitted development within the FWHCA of Mason
Lake. Native landscaping is proposed to mitigate for adverse impacts. We believe the establishment of
native plants will have a net benefit to the FWHCA of Mason Lake.
Prepared By:
r
uth,M.Sc C.E. Jim Cooper
r Restoration and Construction Specialist
6
REFERENCES
Hitchcock,C. Leo and Cronquist,Arthur. 1973. Flora of the Pacific Northwest. University of
Washington Press. Seattle,WA.
Knutson, K.Lea and Naef, Virginia L. 1997.Management Recommendations for Washington's Priority
Habitats:Riparian. Washington Department of Fish and Wildlife. Olympia,WA.
Mason County. 2005.Mason County Resource Ordinance#17-02 Attachment B 17.01.110 Fish and
Wildlife Habitat Conservation Areas. Adopted January 10, 2005. Shelton,Washington.
National Marine Fisheries Service(NMFS). 1999.A Habitat Approach:Implementation of Section 7
under the Endangered Species Act for Actions Affecting the Habitat of Anadromous Salmonids.
Northwest Region.
National Marine Fisheries Services.2000.Puget Sound ESUListed Threatened. Federal Register.Vol.
65 No. 32. Feb. 16, 2000.
Rienman,Bruce E. and McIntypre,John D. 1993. Demographic and habitat requirements for
conservation of bull trout. Gen. Tech. Rep. INT-302. Ogden,UT: U.S.Department of
Agriculture,Forest Service,Intermountain Research Station. 38 p.
Roderick, Elizabeth and Milner,Ruth. 1991.Management Recommendations for Washington's Priority
Habitats and Species. Washington Department of Fish and Wildlife.
Seabird Bycatch Project.2002.Marbled Murrelet Information Page. Internet address:
http://www.ifrfish.or /g byeatch3.htm
Stalmaster,Mark. 1987. The Bald Eagle. Universe Books. New York,New York.
U.S.Army Corps of Engineers. 2000.Listed Fish Species Life Histories for Washington State. Regulatory
Branch of Seattle District. Seattle,WA.
USDA Soil Conservation Service. 1960.Soil Survey:Mason County, Washington.
U.S. Fish and Wildlife Service(USFWS). 999.Endangered and Threatened Wildlife and Plants;
Determination of Threatened Status for Bull Trout in the Coterminous United States;Final Rule.
Federal Register:November 1, 1999 (Volume 64,Number 210). Internet address:
http://endangered.fws.gov/r/fr99670.html.
U.S.Fish and Wildlife Service(USFWS). 1998.Bull Trout Interim Conservation Guidance. Lacey,
Washington.
Washington Department of Fisheries. 1975.A Catalog of Washington Streams and Salmon Utilization.
Vo. 2 Coastal.
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ATTACHMENTS
• Street/Vicinity Map
• Parcel Map
• Aerial Photo
• Site Plan
• Species of Importance
• Best Management Practices
• Native Plant Installation Instructions
• Planting Details
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- 506 EDISON STREET,SE,SUITE 100
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506 EDISON STREET, SE,SUITE 100
OLYMPIA,WA 98501
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FIGURE: Aerial Photo
SOURCE: http://mapmason.co.mason.wa.us
EXISTING PROPOSED
LEGEND Lu
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NORTH 24"(MAX) = LL
BH=BULKHEAD U O
RW#=RETAINING WALL PLANTING SOIL&NATIVE
CL=COMMON LINE 2 MIN VEGETATION 4Y
D#=DECK 1 OVERALL i'` Q I I
SCALE:FEET P#=PATIO
FP=FIRE PIT
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HT=HOT TUB 30" v l m l
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ZONE 3:DEMOLITION AREA DENSE,MINERAL,UNYIELDING w ¢ x w
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0 RESTORATION PLANTING AREAS TYPICAL LANDSCAPE TERRACE WALLS
NOTES: (SECTION)NTS
1 THIS IS NOT A SURVEY. ARBITRARY DATUM:ELEVATION 100FT.
2 COMMON LINE AS ESTABLISHED DURING SITE VISIT WITH MASON COUNTY 1026/06.COMMON LINE OFFSET 15'
3 CRITICAL SPECIFICATIONS: BOTTOM TERRACE AT 8 FT.OUT AS SHOWN.EARTH FILL BUTTRESS PLACED AT
2H:1 V SLOPE RATE. CREST OF FILL BUTTRESS SHALL NOT BE MORE THAN 8 INCHES BELOW TOP OF RW2. cG
COMPACT FILL TO 80%PROCTOR.
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4 CRITICAL SPECIFICATIONS:BOTTOM TERRACE @ 4FT.OUT AS SHOWN. CREST OF FILL BUTTRESS SHALL NOT / 0)
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Habitat Management Plan Check List Of Species Of Importance That May Occur In Mason County
Species Scientific Name Habitat Description Species Presnt Within Species Present Within
Fish
Project Vicini ?YINIU Project Site?Y/N
Bull Trout Salvelinus confluentis Streams,Lakes,Rivers N N
Dolly Varden Salvelinus malma Streams,Lakes,Rivers N N
Hood Canal Summer Chum Onchorynchus keta Streams, Rivers N N
Puget Sound Chinook Onchorynchus tshawytscha Streams, Rivers N N
Reptiles
Western Pond Turtle Clemmys maramorata Ponds, Lakes,Wetlands U N
Amphibians
Cascade Frog Rana cascadae Alpine Lakes, Ponds U N
Olympic Torrent Salamander Rhyacotriton olympicus Small Headwater Streams,Stream Margins U N
Tailed Frog Ascaphus truei Cold, Clear Streams U N
Van Dyke's salamander Plethodon vandykei Streams,Waterfalls, LWD U N
Mollusks
Newcomb's littorine snail Algamorda newcombiana Rocky Shores In The Upper Intertidal Zone N N
Birds
Bald Eagle Haliaetus leucocephalus Salt Water Coasts, Lakes, Rivers, Snags U N
Brandt's Cormorant Phalacrocorax penicillatus Coastal N N
Common Loon Gavia immer Lakes In Summer, Coastal in Winter U N
Golden Eagle Aquilla chrysaetos Mountains, Foothills,Adjacent Fields N N
Great Blue Heron Ardea herodias Wetlands, Fields, Intertidal Zone U N
Harlequin Duck Histrionicus histrionicus Rivers in Summer, Coastal in Winter N N
Marbled Murrelet Brachyramphus marmoratus Old Growth Forest N N
Merlin Falco columbarius Forest Edges, Fields, Marshes U N
Northern Goshawk Accipiter gentilis Mature and Old Growth Forest U N
Northern Spotted Owl Strix occidentalis Old Growth Forest U N
Olive-sided Flycatcher Contopus boreaus Mountainous and Mature Forests U N
Peregrine Falcon Falco peregrinus Cliff Nesting, Marshes, Fields N N
Pileated Woodpecker Drycopus pileatus Mature and Old Growth Forests, Snags U N
Purple Martin Progne subis Open Areas in View of lakes, or Puget Sound U N
Vaux's Swift Chateura vauxi Woodlands Near Water U N
Western Bluebird Sialia mexicana Forest Edges, Open Woods U N
Mammals
Gray Wolf Canis lupis Forests and Tundra N N
Merriam's Shrew Sorex merriami Arid Areas, Sagebrush, Bunchgrass N N
Pacific Fisher Martes pennanti Dense Mature and Old Growth Forests N N
Pygmy Shrew Sorex hoyi Wooded and Open Areas U N
Roosevelt elk Cervus elaphus roosevelti Fields, Meadows, Riparian Forests,Clearcuts N N
Shelton pocket gopher Thomomys Moist Workable Soil U N
Townsend's big-eared bat Plecotus townsendii Caves, Mine Tunnals, Roosts in/on Buildings U N
AGUA TIERRA LAND AND WATER SERVICES, INC.
OLYMPIA, WASHINGTON
BEST MANAGEMENT PRACTICES(BMP'S)
TO MINIMIZE ADVERSE ENVIRONMENTAL IMPACT
THE FOLLOWING CONSERVATION AND CONSTRUCTION MEASURES ARE RECOMMENDED TO AVOID AND MINIMIZE POTENTIAL ADVERSE PROJECTMPACTS.
GENERAL
1. PREVAILING AGENCY GUIDELINES GOVERNING EROSION CONTROL DRAINAGE AND BMP'S ARE CONTINUOUSLY UPDATED. REVIEWING AGENCYAES SHALL
BE RESPONSIBLE FOR MODIFYING THESE SPECIFICATIONS AS NEEDED.
2. DETAIL DRAWINGS MAY ACCOMPANY THESE SPECIFICATIONS. SHOULD DISCREPANCIES IN REQUIREMENTS OCCUR,THE MOST PROTECTIVE SHALL
PREVAIL.(REV.070207)
3. LIMIT USE OF GROUND DISTURBING MACHINERY TO DRY WEATHER.
4. PROTECT EXISTING NATIVE VEGETATION AND HABITAT AREAS FROM CONSTRUCTION DISTURBANCE TO THE MAXIMUM EXTENT PRACTICABLE. INSTALL
BRIGHTLY COLORED AND MARKED*CONSTRUCTION BOUNDARIES'
5. LIMIT AREAS OF EXPOSED ERODIBLE SOILS AT ANY GIVEN TIME. INSTALL TEMPORARY STABILITY MEASURES.
6. SEDIMENT TRACKING ONTO PUBLIC ROADS SHALL BE MINIMIZED. SEDIMENT SHALL BE REGULARLY REMOVED FROM THE ROAD BY SHOVELING OR
SWEEPING.
7. INSTALL ROCK PROTECTED CONSTRUCTION ENTRANCE SURFACES.
8. EROSION AND SEDIMENTATION CONTROL MEASURES SHALL BE IN PLACE PRIOR TO START OF WORK.
9. ALL TEMPORARY EROSION CONTROL DEVICES SHALL BE REMOVED AFTER PROJECT COMPLETION.
10. PROPONENT SHALL COMPLY WITH ALL OTHER PERMITS AND ENVIRONMENTAL PROTECTION REQUIREMENTS SPECIFIED BY PREVAILING AGENCY/IES.
11. SELECTION OF APPROPRIATE EROSION CONTROL DEVICE SHALL BE DETERMINED BY'NET-GAIN'CRITERIA. SELECTION AMONG THE OPTIONS SILT-FENCE
STRAW BALES,AND STRAW WATTLES FOR CONTOUR AND PERIMETER TREATMENTS SHALL BE BASED ON ASSESSMENT OF INSTALLATION IMPACT AS
WELL AS DESIRED SEDIMENT CONTROL. SILT FENCE INSTALLATION TRENCHING CAN HAVE NET ADVERSE IMPACT.
CHEMICAL SPILL RESPONSE AND CONTROL
1. A SPILL RESPONSE AND CONTROL PLAN AND SPILL RESPONSE KIT SHALL BE ON-SITE,HIGHLY VISIBLE.AND INCLUDE TRAINED STAFF AT ALL TIMES.
2. ALL MACHINERY SHALL BE CHECKED DAILY FOR LEAKS AND NECESSARY REPAIRS/CONTAINMENT.
3. REFUELING AND LUBRICATION OF EQUIPMENT SHALL OCCUR IN DESIGNATED AREAS AND/OR FOLLOWING APPROVED PROTOCOLS. NO EQUIPMENT,FUEL,
LUBRICATING OILS,CHEMICALS,OR HAZARDOUS SUBSTANCES SHALL BE STORED OVERNIGHT IN LOCATIONS READILY EXPOSED TO VANDALISM OR IN!
ADJACENT TO PROTECTED NATURAL RESOURCE AREAS.
STANDARD NOTES FOR SILT FENCES
1. FILTER FABRIC SHALL BE PURCHASED IN A CONTINUOUS ROLL CUT TO THE LENGTH OF THE BARRIER TO AVOID USE OF JOINTS.WHEN JOINTS ARE
NECESSARY,FILTER CLOTH SHALL BE SPLICED TOGETHER ONLY AT A SUPPORT POST,WITH A MINIMUM 6-INCH OVERLAP,AND SECURELY FASTENED AT
BOTH ENDS TO POST.
2- POSTS SHALL BE SPACED A MAXIMUM OF 6 FEET APART AND DRIVEN SECURE INTO THE GROUND(MINIMUM OF 30 INCHES).
3. A TRENCH SHALL BE EXCAVATED APPROXIMATELY 8 INCHES WIDE AND 12 INCHES DEEP ALONG THE LINE OF POSTS AND UPSLOPE FROM THE BARRIER.
4, WHEN STANDARD STRENGTH FILTER FABRIC IS USED,A WIRE MESH SUPPORT FENCE SHALL BE FASTENED SECURELY TO THE UPSLOPE SIDE OF THE
POSTS USING HEAVY DUTY WIRE STAPLES AT LEAST 1 INCH LONG,TIE WIRES OF HOG RINGS. THE WIRE SHALL EXTEND INTO THE TRENCH A MINIMUM OF
4 INCHES AND SHALL NOT EXTEND MORE THAN 36 INCHES ABOVE THE ORIGINAL GROUND SURFACE.
5, THE STANDARD STRENGTH FILTER FABRIC SHALL BE STAPLED OR WIRED TO THE FENCE,AND 20INCHES OF THE FABRIC SHALL BE EXTENDED INTO THE
TRENCH.THE FABRIC SHALL NOT EXTEND MORE THAN 36 INCHES ABOVE THE ORIGINAL GROUND SURFACE.FILTER FABRIC SHALL NOT BE STAPLED TO
TREES.
6. WHEN EXTRA-STRENGTH FILTER FABRIC AND CLOSER POST SPACING IS USED,THE WIRE MESH SUPPORT FENCE MAY BE ELIMINATED. IN SUCH A CASE,
THE FILTER FABRIC IS STAPLED OR WIRED DIRECTLY TO THE POSTS WITH ALL OTHER PROVISIONS OF ABOVE NOTES APPLYING.
7. FILTER FABRIC FENCES SHALL NOT BE REMOVED BEFORE THE UPSLOPE AREA HAS BEEN PERMANENTLY STABILIZED.
8. FILTER FABRIC FENCES SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. ANY REQUIRED
REPAIRS SHALL BE MADE IMMEDIATELY.
STANDARD NOTES FOR INLET PROTECTION
1. PLACE CONCRETE BLOCKS LENGTHWISE ON THEIR SIDES IN A SINGLE ROW AROUND THE PERIMETER OF THE INLET,SO THAT THE OPEN ENDS FACE
OUTWARD,NOT UPWARD. THE ENDS OF ADJACENT BLOCKS SHALL ABUT. THE HEIGHT OF THE BARRIER CAN BE VARIED,DEPENDING ON DESIGN NEEDS.
BY STACKING COMBINATIONS OF BLOCKS THAT ARE 4 INCHES,AND 12 INCHES WIDE. THE ROW OF BLOCKS SHALL BE AT LEAST 12 INCHES BUT NO
GREATER THAN 24 INCHES HIGH.
2. PLACE WIRE MESH OVER THE OUTSIDE VERTICAL FACE(OPEN END)OF THE CONCRETE BLOCKS TO PREVENT STONE FROM BEING WASHED THROUGH THE
BLOCKS. USE HARDWARE CLOTH OR COMPARABLE WIRE MESH WITH 1/2 INCH OPENINGS.
3. PILE STONE AGAINST THE WIRE MESH TO THE TOP OF THE BLOCKS. USE 34 INCH TO 3 INCH DIAMETER GRAVEL OR BLEND.
4. PLACE WIRE MESH OVER THE DROP INLET SO THAT THE WIRE EXTENDS A MINIMUM OF 1 FT BEYOND EACH SIDE OF THE INLET STRUCTURE. USE
HARDWARE CLOTH OR COMPARABLE WIRE MESH WITH 1/2 INCH OPENINGS. IF MORE THAN ONE STRIP OF MESH IS NECESSARY,OVERLAP THE STRIPS.
PLACE FILTER FABRIC OVER THE WIRE MESH.
5. PLACE 3/4 INCH GRAVEL OVER THE WIRE MESH. THE DEPTH OF STONE SHALL BE AT LEAST 12 INCHES OVER THE ENTIRE INLETOPENING. EXTEND THE
STONE BEYOND THE INLET OPENING AT LEAST 18INCHES ON ALL SIDES.
6. IF THE STONE FILTER BECOMES CLOGGED WITH SEDIMENT,THE STONES MUST BE PULLED AWAY FROM THE INLET AND CLEANED OR REPLACED.
STANDARD NOTES FOR PLASTIC COVERINGS
1. PLASTIC SHEETING SHALL HAVE A MINIMUM THICKNESS OF 6 MILS""^S!! MEET T"E REeHIREMENTS^F^TA'^A^^SPEB ^AT'^"^SEGTIBN^14
2. COVERINGS SHALL BE INSTALLED AND MAINTAINED TIGHTLY IN PLACE BY USING SANDBAGS OR TIRES ON ROPES WITH A MAXIMUM 10 FOOT GRID SPACING
IN ALL DIRECTIONS. ALL SEAMS SHALL BE TAPED OR WEIGHTED DOWN FULL LENGTH AND THERE SHALL BE AT LEAST A 12 INCH OVERLAP OF ALL SEAMS.
3. CLEAR PLASTIC COVERING SHALL BE INSTALLED IMMEDIATELY ON AREAS SEEDED BETWEEN NOVEMBER 1 AND MARCH 31 AND REMAIN UNTIL VEGETATION
IS FIRMLY ESTABLISHED.
4. WHEN THE COVERING IS USED ON UN-SEEDED SLOPES.IT SHALL BE KEPT IN PLACE UNTIL THE NEXT SEEDING PERIOD.
5. PLASTIC COVERING SHEETS SHALL BE BURIED TWO FEET AT THE TOP OF SLOPES IN ORDER TO PREVENT SURFACE WATER FLOW BENEATH SHEETS.
6. PROPER MAINTENANCE INCLUDES REGULAR CHECKS FOR RIPS AND LOOSE ENDS.
STANDARD NOTES FOR SEEDING
1. SEED MIXTURE SHALL APPLIED AT 200 POUNDS PER ACRE(UNLESS OTHERWISE SPECIFIED IN
PLANS.)
2. SEEDING BETWEEN MAY 1 AND OCTOBER 31 WILL REQUIRE IRRIGATION AND MAINTENANCE AS NECESSARY TO ESTABLISH DENSE ROOTING.
3. SEEDING BETWEEN OCTOBER 31 AND APRIL 30 SHALL BE COVERED WITH:GEOTEXTILES,JUTE MAT,CLEAR PLASTIC COVERING.
4. BEFORE SEEDING,INSTALL NEEDED SURFACE RUNOFF CONTROL MEASURES SUCH AS GRADIENT TERRACE,INTERCEPTOR DIKES,SWALES,LEVEL
SPREADERS AND SEDIMENT BASINS.
5. SEEDBED SHALL BE FIRM WITH A FINE SOIL SURFACE.FOLLOWING SURFACE ROUGHENING. PERFORM ALL CULTURAL OPERATIONS ACROSS OR AT RIGHT
ANGLES TO THE SLOPE.
6. APPLY FERTILIZERS ACCORDING TO SUPPLIER RECOMMENDATIONS. AMOUNTS USED SHOULD BE MINIMIZED,ESPECIALLY ADJACENT TO WATER BODIES
AND WETLANDS.
STANDARD NOTES FOR SOD
1. SOD SHALL BE MACHINE CUT AT A UNIFORM SOIL THICKNESS OF 3/4 INCH AT THE TIME OF CURING. MEASUREMENTS FOR THICKNESS SHALL EXCLUDE TOP
GROWTH AND THATCH.
2. STANDARD SIZE SECTIONS OF SOD SHALL BE STRONG ENOUGH TO SUPPORT THEIR OWN WEIGHT AND RETAIN THEIR SIZE AND SHAPE WHEN SUSPENDED
BY THE END OF A 3 FOOT SECTION.
3. SOD SHALL NOT BE HARVESTED OR TRANSPLANTED WHEN MOISTURE CONTENT(EXCESSIVELY DRY OR WET)MAY ADVERSELY AFFECT ITS SURVIVAL .
AGUA TIERRA LAND AND WATER SERVICES,INC. FIGURE: BEST MANAGEMENT PRACTICES BMP'S
506 EDISON STREET SE.SUITE 100
OLYMPIA,WA.98501
TEL,(360)754-3755
FAX.(360)754-3431
WWW AGUATIERRA.NET
AGUA TIERRA LAND AND WATER SERVICES, INC.
OLYMPIA, WASHINGTON
FILTER FENCE 2"X 4"WOOD POSTS,STD.OR BETTER:
ALT.STEEL FENCE POSTS
FILTER FABRIC MATERIAL 60"WIDE
BOLLS.USE STAPLES OR WIRE RINGS
TO ATTACH FABRIC TO WIRE MIRAFI
I I I t 70OX OR PRE-APPROVED EQUAL
II II
o II II
II II
a II II
II II
o II II
I I BURY BOTTOM OF FILTER MATERIAL IN
I I I I 8"X 12"TRENCH
---+�---------------��--
II II
MAXIMUM
1 I
I 6-0" I
u u
FILTER FABRIC MATERIAL D
I o
I N
0
PROVIDE 3/4"X 1.5'WASHED
GRAVEL BACKFILL IN TRENCH AND
ON BOTH SIDES OF FENCE
FABRIC ON THE SURFACE
SYMBOL: USED IN PLAN VIEW -
STRAW BALE BARRIER
2.PLACE AND STAKE STRAW BALES
3.WEDGE LOOSE STRAW BETWEEN BALES
1. EXCAVATE THE TRENCH
4.BACKFILL AND COMPACT THE EXCAVATED
SOIL
� - m
STAKED&ENTRENCHED
STRAW BALE
(USE EITHER WOOD LATH,
2X2 OR REBAR)
BINDING WIRE OR TWINE I ' I'I II I SEDIMENT LADEN RUNOFF
FILTERED RUNOFF
COMPACTED SOIL TO
PREVENT PIPING
SYMBOL: USED IN PLAN VIEW ,
AGUA TIERRA FIGURE: EROSION CONTROL DETAILS
LAND AND WATER SERVICES,INC.
506 EDISON STREET SE,SUITE 100 • STRAW BALE
OLYMPIA,WA.98501
TEL.(360)754-3755 • SILT FENCE
FAX.(360)754-3431
W W W.AGUATIERRANE7
AGUA TIERRA
Native Vegetation Installation Instructions
Plant material can be obtained from one or more of the following licensed regional nurseries:
Colvos Creek Nursery, Vashon Island, WA (206) 749-9508
Sound Native Plants, Olympia, WA (360) 866-1046
Storm Lake Growers, Snohomish,WA (360) 794-4842
Watershed Garden Works,Longview, WA (360)423-6456
Woodbrook Nursery, Gig Harbor, WA (206)265-6271
Planting Procedure
Planting pits for transplants shall be 1.5 times the depth and twice the diameter of the
transplant root balls. Remove the plant from the container and scarify the sides of the root
ball. Place plant in the planting pit. Backfill the planting hole to 3 inches below finish grade.
Take care to bury plants to proper rooting depth. Install a 2-4 inch deep mulch/wood chips
(non-bark)ring taking care to pull mulch back from tree/shrub trunk,this helps keep weeds
down and retains moisture in the dry season. Provide deep(3-4inches)watering at the time
of planting. Please see attached figures for examples.
Timing
Site conditions permitting,the optimum time for planting most native woody plant material
appears to be the later part of winter and early spring(February-March). Plants installed early
in the dormant season tend to be subject to winter kill and die back. Conversely,plants
installed during the late spring and early summer have been observed to be much less drought
tolerant during the dry summer period.
In cases where project schedules may not coincide with optimal planting times(summer),
additional efforts to irrigate plantings will be necessary.
Maintenance
Maintenance includes irrigation,replacement of dead/dying or undesirable transplants with
appropriate vegetation, and weed control.
Occasional deep irrigation of three inches of water every ten days to plantings during
extended hot and dry periods for the first two years is recommended.
Diligent weed control is required during the first three growing seasons to ensure a successful
planting. This includes keeping grasses and blackberries down between plants, and pulling
Scots broom before it has a chance to flower. Scots broom should be pulled taking extreme
care to not break the taproot off below ground, as it will re-grow. The proper tool for this job
is called a weed wrench and is available for purchase through www.weedwrench.com.
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