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HomeMy WebLinkAboutTED4003775.42SPECIFICATIONS C z = C o m Co z m z m cn 0 D PART I - PLANTING sh Trees shall have uniform branching, single straight trunks, (unless specified INSTALL SPLIT -RAIL FENCE AND SIGNS I_ION I TORT C-7 4 MAINTENANCE PLAN Plants shall be Installed between Dec. I and March 31 following grading as multi -stemmed), and the central leader intact and undamaged. Balled and burlapped stock shall have been root -pruned at least once within the Gontractor shall constructs lit -rail fence per Detail I on Sheet W3 along p P 9 the buffer boundarywhere it has not been removed upon completion of p � PART I: BACKGROUND and clearing of invasive plants, which should be done during the dry previous two ears, and the last stock shall have been noun In p y p 9 planting at the location surveyed by the project engineer . AOA shall Scope of this plan Includes portions within Tract a including the trail, fence and plant season container for at least one full growing season. Container stock shall be approve fence location prior to construction. installation as depicted on this approved plan set dated 0q-26-2014. Areas outside of the planting locations are not covered under this plan and are part of the previously GENERAL CONDITIONS full rooted but not root -bound. Plant material with damaged root zones g approved N6PA for the Ribero Balko Short Plat recorded an 04-Oq-200�i. h h II tl or oken root balls will not be accepted. Gontractor shall install Native Growth Protection Area (NGPA) signs (per In t e mitigation area(s), t e on a remove weedy or exo c Inva5lve species roots i tops (e.g., Scot's broom, English ivy, Himalayan and evergreen blackberry, reed canarygras5, purple loosestrlfe, hedge bindweed (morning glory), Japanese knotweed, Gonada thistle, and creeping nightshade) by manual or chemical means (as approved by regulatory agencies) prior to plant installation. Within the existing buffer enhancement area to be maintained and monitored, which was planted approximately two years ago, the landscape contractor shall remove, by hand, all invasive species listed above. Gontractor shall verify that plant installation conditions are suitable within the mitigation area(s). Any unsatisfactory conditions shall be corrected prior to start of work. When conditions detrimental to plant growth are encountered, such as rubble fill, adverse drainage conditions, significant vegetation, or obstructions, Gontractor shall notify AOA prior to planting. Beginning of work constitutes acceptance of conditions as satisfactory. Plants installed in undisturbed areas shall be integrated with existing native vegetation, and planted in a random, naturalistic pattern. TOPSOIL PLACEMENT, TRAIL, FENCE 4 SIGN INSTALLATION Glean, native topsoil from the cleared portions of the site, shall be placed within the enhanced buffer per the site civil engineer's grading plans. TESL facilities shall be in place prior to placement of topsoil. AOA shall stake centerline of trail after topsoil placement. Gontractor shall over -excavate graded buffer areas 4" to allow for placement of 4" of Imported compost over all topsoiled areas (out5lde trail). Gompo5t shall be tilled into the top &" of newly placed soil to create a minimum of 12" of viable planting medium. AOA to review tilling prior to Seeding. In the existing buffer enhancement areas to be maintained, AOA shall stake trail centerline. Any shrubs located within 4' of the centerline shall be relocated to other areas within that enhancement area during the planting season (November - March). Upon completion of the trail installation, contractor shall construct split -rail fence per Detail I on Sheet 1^13 along the buffer boundary of the entire project upon completion of planting at the location surveyed by the project engineer . AOA shall approve fence location prior to construction. Gontractor shall install Native Growth Protection Area (NGPA) signs (per Detail I on Sheet W3) after fence construction. Signs shall be installed per City of Renton standards. Upon completion of fence and trail installation, all topsoiled areas shall be seeded with the mix specified in this plan set. An interpretive sign shall be designed by AOA and prior approved by the Gity of Renton prior to installation. The sign shall be provided by AOA and installed by the landscape contractor per the Detail 3 on Sheet W3 at a location Staked by AOA. GONTRAGTOR TO VERIFY PLANT 5GHEDULE WITH PLAN Gontractor is responsible to verify plant locations and quantities of plants on the Plant Schedule with those represented on the plan. Actual plant quantities shown on plans are to prevail over quantities shown on the Plant Schedule in the event of a discrepancy. LOGATE/5TAKE/VERIFY PLANTING AREAS Gontractor shall field locate, stake, and verify planting areas and configurations prior to planting. AOA shall review and approve locations prior to planting. Proposed locations of trees and shrubs shall be staked and Identified with an approved coding system or by placement of the actual plant material. For large groupings of a single 5pecle5 of shrub, Gontractor may stake the planting boundaries. AOA shall review and approve locations of ail plants and plant groupings prior to planting. APPROVE PLANTING LOCATIONS AND 5PAGING Planting locations shown on planting plans are approximate, based on anticipated site conditions. Actual planting locations may vary from those shown due to final site conditions and locations of existing vegetation. Nevertheless, any variations from the planting plan will require prior approval by AOA. Plant spacing for species listed 15 to be random (naturalistic), and not in a regular grid pattern. On -center spacing called out on plant list Indicates an average spacing dimension. For example, when the plan calls for 36" O.G., spacing shall vary from 30"-42" O.G., with an average spacing of 36 inches. AOA shall review planting locations and spacing prior to plant Installation. Shrubs shall be installed a minimum of 2' from fence and trees a minimum of 4' from fence. PART 2 - PLANT MATERIAL 5TANDARD5 PLANT MATERIALS AOA shall examine plant material prior to planting. Any material not meeting the required specifications shall be immediately removed from the site and replaced with like material that meets the required standards. Plant material shall meet the requirements of State and Federal laws with respect to plant disease and infestations. Inspection certificates, required by law, shall accompany each and every shipment and shall be submitted to AOA upon Gontractor's receipt of plant material. Plant materials shall be locally grown (western WA, western OR, or western BG), healthy, bushy, in vigorous growing condition, and be guaranteed true to size, name, and variety. If replacement of plant material 15 necessary due to construction damage or plant failure within one year of installation, the 51ze5, species, and quantities shall be equal to specified plants, as indicated on the plans. Plants shall be nursery grown, well -rooted, of normal growth and habit, and free from disease or infestation. AOA reserves the right to require replacement or substitution of any plants deemed unsuitable. Gonlferous trees shall be nursery grown, full and bushy, and with uniform branching and a natural non -sheared form. Original central leader must be healthy and undamaged. Maximum gap between branching shall not exceed 9", and length of top leader shall not exceed 12". Shrubs shall have a minimum of three stems and shall be a minimum height of 18 inches. Gontractor shall submit documentation that specified plant materials have been ordered and secured. A list of supplier names, addresses, phone numbers and the storage/growing location of the materials shall be submitted to AOA within 30 days of contract award. SUBSTITUTIONS Substitutions of specified plant species, size, or condition will be allowed only if prior written approval is obtained by AOA and regulatory agencies prior to ordering material. Bareroot stock of equal size to specified container plantings may be substituted for deciduous container plantings when available, but only with prior approval by AOA. Evergreen plant material shall be container only. VERIFY NURSERY STOCK CONDITION AOA shall inspect plant material at the job site, Including previously tagged trees, for compliance with required standards for plant size and quality prior to planting. This includes, but is not limited to, size and condition of rootball5 and rootsystems, presence of Insects, latent injuries and defects. Trees must be untied and separated for inspections. AOA reserves the right to refuse any/all plant material any time prior to final acceptance If It is determined that such material does not meet the specifications as described herein. Rejected material shall be immediately removed from project site. VERIFY STORAGE SITE AND METHOD Plants shall be stored in a manner necessary to support their horticultural requirements. Plant material stored on -site shall be protected from weather damage, construction activity and the public. Balled and burlopped material which cannot be installed immediately shall be "heeled -in" to prevent desiccation prior to planting. Rootbails shall be protected by covering with moist soil, mulch or sawdust and watered as necessary. Plant specimens shall be kept moist (wetland species saturated) and shaded until the actual time of plant installation. Immediately after planting, lolls in the planting area shall be saturated to prevent capillary stress. PART 3 - PLANT INSTALLATION SOIL PREPARATION/AMENDMENT5 Prior to Installation of plantings, all construction debris and any other non-native material shall be removed from the mitigation area. Trees and shrubs shall be pit planted as shown in details on Sheet 1^13. A soli moisture retention agent (polymer) shall be included in planting backfill per manufacturer's specification. In all planting areas, after placement of stockpiled topsoil, all planting pits shall be backfilled with a 30/70 mixture of Pacific Garden Mulch (PGM) and the native soil from the planting pit. MULGH A 3" layer of composted hog -fuel or imported medium course bark mulch shall be placed around the base of each new tree (36" dia. ring) and shrub planting (24" dia. ring) for erosion, weed control, and moisture retention. Within groundcover areas, mulch shall be spread at 3" depth continuously throughout bed. 5TAKING Trees shall be staked with at least one stake and attached at a height of approximately 3/4 the height of the tree. Gontractor shall remove stakes at the end of the one-year guarantee period, unless otherwise directed by AOA. PART 4 - IRRIGATION, SIGNS, AND GLEAN UP TEMPORARY AUTOMATIC IRRIGATION SYSTEM Gontractor shall install an above ground temporary irrigation system per Drawings Lb-LIO. Glient shall provide water and electricity for the system. irrigation is required within the mitigation area(s) for at least two growing seasons following planting to ensure adequate establishment of plant material. The Maintenance Gontractor shall be responsible to activate, winterize, maintain, and to continually verify adequate operation of the temporary irrigation system. System function (Including electronic valve and controller function) shall be inspected for operation and full coverage of all planted areas during each maintenance visit. The system shall be repaired immediately if found to be damaged or malfunctioning. The system shall be activated by June 15 and winterized by October 15. If hot dry weather occurs either before or after these dates, the irrigation system shall be activated earlier in the season or remain active later Into the fail. During the first year after installation, the irrigation system shall be programmed to provide )�" of water every three days. Irrigation rates may be increased as necessary during prolonged periods of hot, dry weather to prevent plant mortality. During the second year after installation, irrigation shall be programmed to provide )2" of water once a week. However, if more than 10% of plant replacement occurs, watering rates will be maintained at a rate of )2" of water every three days for the duration of the monitoring period. A chart describing the location of all installed or open zones and corresponding controller numbers shall be placed inside the controller and given to the Owner's representative. The Irrigation bid shall include a one-year warranty against defects in materials and workmanship from the date of final project acceptance. The warranty shall include system activation and winterization for the first year and immediate repair of the system if it is observed to be malfunctioning. Detail I on Sheet W3) after fence construction. Signs shall be installed per Glty of Renton standards. RESEED DISTURBED AREAS Gontractor shall re -seed (and thoroughly water) exposed soils with the seed mixes specified in the Plant Schedule following planting installation. RESTORE EX15TINO NATURAL OR LANDSCAPED AREAS Existing natural or landscaped areas that are damaged during construction shall be restored to their original condition, unless Improvements or modifications are specified for those areas. Gontractor shall exercise care to protect from injury to trunk, roots, or branches, of any trees or shrubs that are to remain. Any living woody plant that is damaged during construction shall be treated within 24-hour5 of occurrence. AOA shall be notified Immediately of incident. "Wound shaping" to include evenly cutting broken branches and damaged tree bark. AOA shall be notified, and Gontractor shall prune wounded portions of plant immediately after damage occurs. Injured plants shall be thoroughly watered and additional measures shall be taken, as appropriate, to Old in plant survival. GLEAN -UP Gontractor shall be responsible for the removal of construction materials and debris on the site following installation of plant materials. PLANT WARRANTY Gontractor'S warranty shall include replacement of plants (same size and species shown on the drawings) that prove either to be mislocated or unsuitable as to plant material standards. Except for loss due to excessively severe climatological conditions (substantiated by 10-year recorded weather charts), installed plant materials are required to be guaranteed for one year against defects and unsatisfactory growth, except for cases of neglect by Owner or abuse/damage by others. Plants replaced shall be reinitiated under plant guarantee conditions. Any changes or modifications to this plan must receive prior approval from AOA. FINAL AGGEPTANGE Upon completion of planting, the Gontractor shall provide AOA with a set of clearly marked prints designating the actual locations of plantings within the mitigation area. Gontractor shall keep a complete set of prints at the job site during construction for the purpose of "red -lining" changes or modifications to the approved plans and shall update said information on a daily basis. AOA shall approve planting locations. If items are to be corrected, a punch list shall be prepared by AOA and submitted to the Gontractor for completion. After punch list Items have been completed, AOA shall review the project for final acceptance of plan implementation. The date of final acceptance shall constitute the beginning of the one-year plant guarantee period. MAINTENANCE Gontractor shall review landscape maintenaince recommendations with a qualified wetland biologist from AOA who is familiar with the stated goals and objectives of the mitigation plan. Gontractor shall maintain trees and shrubs, 05 needed, for a period of one year from final acceptance, to maintain healthy growth and habitat diversity, including a) tighten and repair tree stakes, b) reset plants to proper grades and upright positions, and c) correct drainage problems as required. Gontractor shall be responsible for watering plants immediately upon installation, and again over the entire planting area upon completion of landscape installation. Irrigation is required within the mitigation area for at least two growing seasons following planting to ensure adequate plant establishment. Gontractor shall remove tree stakes and guy wires two years after installation unless receiving written permission from AOA to remove stakes and guy wires one year after Installation. Gontractor shall correct erosion and drainage problems as required. Gontractor shall remove 511t fencing upon receiving written permission to do so by AOA, usually one year after the Agencies have approved the mitigation construction. Restore the area by hand seeding with seed mix consistent with that used on adjacent planted areas. Gontractor shall remove irrigation system 2-year5 after planting. Upon completion of the one year maintenance, an inspection by AOA shall be conducted to confirm that the mitigation area was properly maintained. If items are to be corrected, a punch list shall be prepared by and submitted to the Gontractor for correction. Upon correction of the punch list items, the project shall be reviewed by AOA for final closeout of plan implementation. PART 2: FINAL AGGEPTANGE Upon completion of the planting, the Landscape Contractor shall provide AOA with a set of clearly marked prints designating the actual locations and quantities of plantings within the mitigation areas. Landscape Contractor shall keep a complete set of prints at the job site during construction for the purpose of "red -lining" changes or modifications to the approved plans and shall update said information on a daily basis, AOA shall approve planting locations. If items are to be corrected, a punch list shall be prepared by AOA and submitted to the Landscape Contractor for completion. After punch list Items have been completed, AOA shall review the project for final acceptance of plan implementation. After acceptance has been obtained, Landscape Contractor shall provide as -built drawings to AOA of planted material. AOA shall visit the site upon completion of mitigation plan implementation and provide the City of Renton with written confirmation that Installation complies with this plan. If AOA Is unable to provide the City of Renton with such verification, an as -built wetland mitigation plan shall be prepared by AOA and submitted to the City for review and approval. The date the city of Renton receives AOA written confirmation of iretollation pursuant to the final approved mitigation plan, they shall constitute beginning of the 5-year maintenance and monitoring period. PART 3: ONE-YEAR WARRANTEE MAINTENANGE As part of the construction budget for the project, the landscape contractor shall maintain the mitigation work during construction and for a period of one-year after construction. Maintenance shall be conducted according to section 4 below and pursuant to Renton Municipal code to clearly ensure that structures, Improvements and mitigation perform satisfactorily for a period of 5 years. After warrantee replacements are completed by the Landscape Contractor, the remain" 4 years of maintenance shall be completed as part of the long-term maintenance and monitoring budget. PART 4: LONG-TERM MONITORING 4 MAINTENANCE SCHEDULE The monitor" and maintenance program will be conducted for a period of five years, with quarterly reports submitted to the City of Renton for the first year after construction acceptance and annual reports submitted for Years 2-5. Although the entire mitigation area will be reviewed, permanent vegetation sampling plots will be established at selected locations to Incorporate all of the representative plant communities. The same monitoring points will be re -visited each year with a record kept of all plant species found. Vegetation will be recorded on the basis of relative percent cover of the dominant species within the vegetative strata. Photo -points will be established from which photographs will be taken throughout the monitoring period. These photographs will document general appearance and progress in plant community establishment in the enhancement area. Review of the photos over time will provide a visual representation of success of the mitigation plan. PART 5: GOAL, OBJECTIVES AND PERFORMANCE STANDARDS FOR MONITORING The primary goal of the mitigation plan is to increase the buffer functions over current conditions. To meet this goal, the following o"ctives and performance standards have been Incorporated Into the design of the plan: 5.1 - OBJECTIVE A Increase the structural and plant species diversity within the mitigation area. 5.2 - PERFORMANCE STANDARD FOR OBJECTIVE A Follow" every monitoring event for a period of at least five years, the mitigation area will contain at least a native plant species. Following each monitoring event, there will be at least an &0% survival rate of all initially planted tree and shrub species or equivalent replacement of a combination of planted and re -colonized native species. 5.3 - OBJECTIVE B Limit the amount of Invasive and exotic species within the mitigation area. 5.4 - PERFORMANCE STANDARD FOR OBJECTIVE B After construction and following every monitoring event for a period of at least five years, exotic and Invasive plant species will be maintained at levels below 15% total cover in all planted areas. These species Include, but are not limited to, 5cot's broom, Himalayan and evergreen blackberry, reed canarygrass, morning glory, Japanese knotweed, English Ivy, thistle, and creeping nightshade. PART 6: LONG-TERM MAINTENANCE 5PECIFIGATION5 Maintenance will be conducted on a routine, year round basis. Additional maintenance needs will be Identified and addressed following a twice -yearly maintenance review. contingency measures and remedial action on the site shall be Implemented on on as -needed basis at the direction of the wetland consultant or the owner. 6.1 - WEED CONTROL Routine removal and control of non-native and other Invasive plants (e g., 5cot's broom, reed canarygross, Himalayan and evergreen blackberry, Japanese knotweed, English ivy, morning glory, thistle and creeping nightshade) shall be performed by manual means. 6.2 - IRRIGATION The owner shall ensure that all plants are Irrigated from June I through October 31. During the first year after Installation, Irrigation should occur at a rate of 1/2" of water two to three tines a week. During the second year after installation, irrigation should occur at a rate of 1/2" of water once a week. However, If more than 10% of plant replacement occurs, watering rates should be maintained at 1/2" of water twice a week. 6.3 - MAINTENANGE OF TREES Routine maintenance of planted trees shall be performed. Measures include resetting plants to proper grades and upright positions. Tall grasses shall be weeded at the base of plants to prevent engulfment. Weed control should be performed by; hand removal, installation of weed barrier cloth with mulch rings, or selective weed -whacking. if weed -whacking is performed, great care shall be taken to prevent damage to desired native species either planted or re -colonized. 6.4 - PRUNING OF WOODY PLANTS Woody plants shall only be pruned at the direction of the wetland consultant or to remove pest Infestations (i.e., tent caterpillar). PART -T. GONTINGENGY PLAN All dead plants will be replaced with the some species or an approved substitute species that meets the goal of the mitigation plan. Plant material shall meet the some 5pecificatkms as originally -Installed material. Replanting will not occur until after reason for failure has been Identified (e.g., moisture regime, poor plant stock, disease, shade/sun conditions, wildlife damage, etc). Replanting shall be completed under the direction of the wetland consultant, City of Renton, or the owner. L O 2 � U STATE OF WA5HINOTON RE6ISTHZED LANDSCAPE ARCHTECT 3511W E CATHERIPE OLIVE C19WK-ATE No. i44 EXPIRES 6/25/2015 �Y I v !V Q O R 377542 w N o O) m nW Recommended for Approvcd BYL - Date Z'1Z- Date 07-2&-14 Scale AS NOTED Project# 4540 Sheet # A, OF 5 M m O M a M W D D z C m M CD Cm N M D Z G� C a) M W 1v > CD �z No O o 1 � z � CJJ V1 cn D T n 0 M 0a D �M D cn T �.