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HomeMy WebLinkAboutR-404516REVISIONS a Y a o 0 Q 00 C, 0 0 0 0 i i m <c o r> w i 00 u)Ln w �Q) �0 NOTES 1. Significant treees shown have not been reviewed by an arborist to determine the health OF the tree, The number of algnificant trees may be reduce depending on the Findings of a certified arborist, 2, Street tree locations are approximate and may be adjusted per actual utility and driveway locations. 3. Trees shown to be retained on the tree retention plan shall be maintained by the future owners or the proposed lots, consistent with KCC 16,62,156 U) PLANTING SPECIFICATIONS PART I - PLANTING SPECIFICATIONS A PORTION OF THE S.W. 1/4 OF SECTION 33,-,rOWNSHIP 23 NORTH, RANGE 5 EAST, W.M. KING COUNTY D.D.E.5. I 9 ice) f SEE SE X _ 3 24 25 26 27 28 29 30 31 l -- General Condltfono Landscape contractor / Developer shall verify that plant installation conditions are suitable within the planting areas. Any unsatisfactory conditions shall be corrected prior to start of L!ork. When conditions detrimental to plant growth are encountered, such as rubble fill, adverse dra nape conditions, significant vegetation, or obstructions, the landscape contractor / developer shall notify KC DDES 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. LOCATE / STAKE / VERIFY PLANTING AREAS + Landscape contractor / Developer shall field locate, stake, and verify planting areas and configurations prior to planting. This shall approximate what is shown on the DDES approved Significant Tree Retention plan. All revisions / changes shall be pre -approved by DDES anc, documented for recording at final plat approval, APPROVE PLANTING LOCATIONS AND 5PAC11.1Cz = Planting locations shown on planting plans are approximate, based on anticipated site condlLiona. Actual planuri!g locations may vary from those shown due to final alto conditic:�ns ?nd locations of existing vegetation. Nevertheless, any variations from the planting plan will requre prior approval by KC DDES. + Significant tree spacing shall be a minimum of Fifteen Feet (15' for non -street trees or 40' on center For street trees) or as stated on the approved planting plan, Spacing shall be adequate to allow significant tree's room to expand throughout the future years. PART 2 - PLANT MATERIAL STANDARDS + Landscape contractor / developer shall examine plant material prior to planting, Any material not meeting the required specifications shall be immediately removed from the site and replayed with like material that meets the required standards. Plant material shall meet the requirements of County, 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 submittec to the Landscape contractor / developer upon receipt of plant material, These certificates shall be made available to KC DDES as requested by the Inspector, + Plant materials shall be locally grown (Western WA, Western OR, Western BC), healthy, buaFx, in vigorous growing condition, and be- guaranteed true size, name and variety. If replacement 01' plant material is necessary due to construction damage or plant failure within three (3) years of installation, the sizes, species and quantities shall be equal to speclFled plants as indicated on the approved plans. + Plants shall be nursery grown, well -rooted of normal growth and habit, and free from dlaease infestation. KC DDES reserves the right to require replacement or substitution of any plants deemed unsuitable. = Trees shall have: uniform branching, single straight trunks and the central leader intact ancc undamaged. Balled and burlapped stock shall have been root -pruned at least once within prevloue two years, and the plant stock shall have been grown in a container for at least one full growing season. Container stock shall be fully rooted but not root -bound. Plant material with damaged root zones or broken root balls will not be accepted. + Coniferous 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. = Landscape contractor / developer shall submit a list of plant supplier names, addreeaes,phone numbers, and storage / growing locations or the material to KC DDES prior to planting. SUBSTITUTIONS + Substitutions of apecifled plant species, size or condition will be allowed only with prior written approval from KC DDES, PART 3 - PLANT INSTALLATION SOiL PREPARATION / AMENDMENTS + 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 the approved plan details. A soil moisture retention agent (polymer) shall be included in plantinc backfill per manufacturer's specifications, In non -graded planting areas, planting pits all be backfilled with a 50/50 mixture of imported, weed free topsoil and the native soil from the planting pit, in graded areas, plantings shall be Installed directly into newly placed topsoil. Imported topsoil shall be a 3-way mix acquired From an approved local supplier. 5oilMoist, or equivalent, shall be added to the topsoil backfill of all planting pits. The SoflMoist shall be hydrated before being added to topsoil backfill. Manufacturers recommended application rates and usage shall be Followed. + Woody plantings shall be fertilized with a slow release (6 month) high nitrogen, low phosp-lorus granular fertilizer (21-3-1), with application rates as speciried by the manufacturer. Fertilizer shall be applied after planting pit is backfilled, and prior to application of mulch, Fertilizer shall not ',;�e applied between November and March + Outside of wetland areas, a 3 inch layer of mulch (medium Doug Fir bark) shall be placed around the base of each new tree to a 36" diameter For erosion, weed control and moisture retention, 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 areal. + Landscape contractor / developer shall exercise care to protect from injury to trunk, rc,_�te, or branches of any trees or shrubs that are to remain. Any living woody plant that is damaged daring construction shall be treated within 24 hours of occurrence. Contractor 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 aid in plant survivability. Grading: The cluFF layer and native topsoil shall be retained in an undisturbed state to the maximum extend practicable, Any duff layer or topsoil removed during grading aholl be stockpiled on -site in a designated, controlled area not adjacent to public resourcea and critical areas, The material shall be reapplied to other portions of the site where Feasible, Areas that have be6r cleared and graded shall have the soil moisture holding capacity restored to that of the orf_�lnal undisturbed soil native to the site of the maximum extent practicable. The soil in any area that has been compacted or that has had some or all of the durf layer or unclarlying topsoil removed shall be amended to mitigate for lost moisture-holdingg, capacity. The amendment shall take place Lstween May I and October I. Replaced topsoil shall be a minimum of 8 Inches thick, unless the applicc:nt demonstrates that a different thickness will provide conditions equivalent to the soil moisture holding capacity native to the site. Replaced topsoil shaill have an organic matter content cf between 8 to 13 percent dry weight and a pH suitable For the proposed landscape plants, CLEAN UP Landscape contractor / developer shall be responsible for the removal of construction material and debris on the site followinj installation of plant materials, All debris must be removed to a legal landfill facility. PART 4 - PLANT WARRANTY AND_MONITORING = Landscape contractor / developer's warranty shall Include replacement of plants (same size and species shown on approved plans) that prove either to me mislocated or unsuitable as to plant material standards, Except For loss due to excessively severe climatological conditions (substafned by 10-year recorded weather charts), installed plant material are required to be guaranteed for three years against defects and unsatisfactory growth, Plants replaced sha Il be refnitfated under plant guarantee conditions, The monitoring period shall be three (3) years from installation acceptance in writing by the DDES Inspector. PART 5 - FINAL ACCEPTANCE = Upon completion of planting, the landscape contractor / developer shall provide the DDES Inspector with a set or clearly marked prints deaignatfnrg the actual locations of plantings within the mitigation area, Landscape contractor / developer 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, KC DDES shall approve planting locations as depicted on the approved replanting plan. If items are to be corrected, a punch list shall be prepared by the ODES inspector and submitted to the Landscape contractor / developer For completion, After punch list items have been completed, DDES Inspector shall review the project For final acceptance on plan implementation. = AS BUILT SUBMITTAL ON PLATS Note: IF revisions and / or changes have been made to the initial DDES approved significant tree retention plan submit an As -Built plan. IF no changes / revisions have been made an As -Built Plan Is not required. Prior to final plan inspection for the Significant Tree Retention Plan permittee shall submit an AS -BUILT Significant Tree Retention Plan to the DDES Inspector showing all plan revisions / changes and verlFying that the DDES approved Significant Tree Retention plan (approved at the DDES Engineering Review stage) has been completed per plan requirements. This AS -BUILT plan shall be reviewed and approved by the Site Development 5peciallat / Forester that it conforms to 50-220 and can be recorded. If approved the plan will be sent back to the DDES Inspector for final plan inspection processing. Mitigation monitoring For Significant Tree shall commence upon acceptance and approval of this A5-5UILT plan and last For 3 years or growing seasons. -IEET L-1 I PART 6 - MAINTENANCE AND CONTINGENCY SYMBOL LEGEND — EXISTING TREES TO BE RETAINED SIGNIFICANT TREE COMMON NAME SIG. CAL, INCHES Botanical name DECIDUOUS TREE 12 INCHES OR MORE APPLE , alus species ALDERt , Alnus glulinosa ` CHESTNUT Caslanea saliva LOCUST 5�Wn, Rzsbinia pseudoacacia f BLACK COTTONWOOD Poptdus /richocarpa DOUGLAS FIR 8 INCHES Psuedotszcga rnenziesii OR MORE WESTERN HEMLOCK Tsuga heterophylla F WESTERN RED CEDAR', Thuja plicata SYMBOL LEGEND — EXISTING TREES TO BE REMOVED SIGNIFICANT TREE am COMMON NAME SIG, CAL. INCHES Botanical name DECIDUOUS TREE SIZE INDICATED APPLE _ fLlalus species ALDER X Alnus glutinosa CHESTNUT Castanea saliva ' LOCUST Rub inia psezaloacacia ", BLACK COTTONWOOD Populus trichocarpa DOUGLAS FIR Psuedolsuga rnenziesii WESTERN HEMLOCK Tsuga heteropitylla WESTERN RED CEDAR Thztja plicata REPLACEMENT TREE PLANT LEGEND L�L BOTANICAL / CaMMC>N NAME TNUJA PLICATA / WESTERN RED CEDAR FRAXINUS LATIFOLIA / OREGON A5N WITHIN TRACT B & D� CIE QUANTITY TRE55 NO LONGER REMAINING IN RETENTION INVENTORY A8 OF i`1AY 15, 2001 FIELD VERIFIED BY E5M CONSULTING, ENGINEERS LLC Note: If street tree's to be planted also qualify For signiffcant tree's then the street tree maintenance aid monitoring process shall be used. = Maintenance will be performed twice per year to address any conditions that could ,Jeopardize the success of the mitigation area. Established performance standarda for the project will be compared to the monitoring results to judge tK-, success of the mitigation project, IF there is a significant problem with achleving the performance standards, the bond holder shall work with KC: DDES to develop a contingency plan, Contingency plans can inclucle, but are not limited to: regrading, additional plant Installation, erosion control, mediations to hydrology, and plan substitutions of type, size, quantity and location, Such contingency plan shall be submitted to the KC DDES Inspector by December 31 of any year when deffclenclea are discovered. Contingency will include many of the items listed below and would be Implemented if the performance standards are not met. Maintenance and remedial action on the site will be Implemented immediately upon completion OF the monitoring event (unless otherwise specifically indicated below), = During year one, two and three replace all dead plant material, Water all plantings at a rate or I" of water at least every week between June 15-8eptember 15 during the first year after installation, and for the First year after any replacement plantings (C 4 M), + Replace dead plants with the: same species or a substitute species that meets the goal and objectives or the enhancement plan, subject to KC DDE5 approval, Re -plant area after reason for Failure has been identified (e.g, moisture regime, poor plant stock, disease, shade/sun condltiorna, wildlife damage, etc), Remove / control weedy or exotic invasive plants (e.g. Scot's Broom, reed canary grass, Himalayan Blackberry, purple loosetriFe, etc,) by manual or chemical means as approved by KC DDES. Use of herbicides or pesticides within the mitigation area would only be Implemented If other measures Failed or were considered unlikely to be suecesaful, and would require KC DDE5 approval. Trees and shrubs should be weeded to the drfplins and mulched to a depth of 3 inches, All non-native vegetation must be removed and dumped off site at an approved location, = Clean-up trash and other debria. = selectively prune woody plarts to thin and remove dead or diseased portion of trees. ART i - PERFORMANCE BONDS = To assure the success of the mitigation, a performance bond will be posted with KC DDES by the Developer at the time of plat approval For the coat of implementing the mitigation plan to be monitored For three (3) years, It will be the Developer / permittee responsibility to request a final fnspectlon at the end of the three (3) year monitoring period and to release the pasted bond. The bond quantity calculation Form for both existing sicJniricant trees and trees to be planted shall be completed and submitted to DDES Site Development Services prior to approval of the SlgniFlcant Tree Retention Plan (the bond form will be provided by the SOS Forester at the time of the SlgniFlcant Tree Retention plan review stage), The actual bond will need to be submitted to DOE$ prior to project acceptance For field inspection by the Land Use Inspection Unit SIGNIFiCANT TREE RETENTION NOTES SIGNIFICANT TREE RETEriTiON NOTES: KC 21A.38,230 (60-220) Review Engineer Senior Engineer JAMES H. SANDERS, RE, DEVELOPMENT ENGINEER EXISTING TREE nr ipi wi GkLVANIZED WIRE TE`15AR Ca6-1 SAFETY FENCE OR EQUAL STEEL FENCE POST OR 2' x 2' WOODEN POST - TYPICAL = Pursuant to KCC 16.82.156 an approved Significant Tree Retention Plan is required For the property as described on file with King County Department and Development and Environmental Services (DDES) Records Center, on sheet i Of the approved engineering plans Number L05P0005, and Activity Number 1_055R054. Lots 1,6,-1,6,10,11,12,14,15,19,20,21,22,30,34,42,43,44,45,46,48,49, and Tract B within this plat contain trees the must be retained per said approved Tree Retention Plan, Any proposed clearing, grading or construction activities that will (or may) impact a significant tree within said lots must be reviewed and approved by King County DDES Land Use Services Division and / or successor, For compliance with said Tree Retention Plan. The current landowner and future landowners shall maintain and protect said trees and secure permita as required to perform any maintenance and / or related activity such as hazard tree remediatfon, = The permit applicant shall determine that the Final tree retention plan does not include significant trees unable to survive more than ten years after the date of project completion. = Significant Tree Protection: I. Prior to any clearing all trees to be retained shall be flagged, 2. Prior to grading and throughout construction, a temporary chain]Ink, wire or plastic net Fence shall be used to identify the protected are (drip line) of any significant tree designated for retention, The height OF such Fencing shall be adjusted according to the topographic and ve ;dative conditions of the site to provide clear visual delineation OF the protected area, The size of the protected area around the tree shall be equal to one foot diameter For each Inch of tree trunk diameter measured four feet above the ground or at drip line of the tree, = At no time during and after construction shall the following be permitted within the signiricant tree protection area: (a) impervious surfaces, fill, excavation, or storage of construction materials (b) grade level changes, except in limited circumstances where proposed improvement using permeable materials are determined by an arborist to be non -detrimental to the trees root system. Significant Tree Maintenance: (a) All significant trees shall be maintained For the lire or the project including monitoring. (b) All significant trees shall be pruned and trimmed as necessary to maintain a healthy growing condition or the prevent primary limb failure, This requirement shall not be interpreted to allow: (1) topping of primary stems (2) pruning that results in the loss of 20 percent of vegetative mass (3) cutting of major roots, except In preparation For transplantation or as deemed necessary and / or acceptable by a certified arborist, (4) With the exception or dead, diseased or damaged trees specifically retained to provide wildlife habitatf other dead, diseased, damaged or stolen planting shall be replaced immediately or the next planting season iF the loss does not occur In a planting season. STEEL FENCE POST OR — 2' x 2' U)OODEN POST- TYP. a +/- POSTS MIN. tv 6-7 DISTANCE APART MAX. CIRCLING RETAINED TREE AT DRIPLINE, RUDTSOIL ROOT ZONE. TREE PROTECTION DETAIL NOT TO SCALE A "significant tree" is defined as an existing healthy tree that 16 not a hazard tree (fe, a tree that does not have a high propabillty or imminently falling due to a debilitating disease or structural defect) and that, when measured Four and one half Feet above grade, has a minimum diameter of: I. 6" For evergreen trees, or 2, 12" For deciduous trees. SigniFfcant trees located in the interior of the development proposal, including sensitive areas and their buffers, shall be retained In the residential subdivision at the rate of 10 trees per acre or Five percent of auch trees, whichever is Greater A significant tree may be credited as two trees when it meets one or more of the following characterlots: i. The tree is 18 Inches or greater in diameter li, The tree is located in a grouping, of at least five trees with canopies that touch or overlap IiI, The tree provides energy savings through winter wind protection or summer shading as a result of its location relative to buildings Iv. The tree belongs to a unique or unusual species. Plan modification& and tree replacement are permitted as Follows: a, Any sicJ,nificant tree in the Interior may be replaced by another significant tree in the interior, b, IF the required number of significant trees cannot be retained, then non -significant sized trees may be retained or new trees ma be planted to meet the significant tree requirements as follows, provided that L reason for the purpose of this subsection, the significant tree to be replaced by the new or existing replacement tree is assigned a diameter of 12 Inches: i, When using replacement trees measuring three Inches in diameter or greater (as measured by caliper), one-half inch diameter of replacement tree shall be provided for every one inch diameter of significant tree to be replaced, and i1, When using replacement trees measuring less than three inches in diameter, one inch diameter or replacement tree shall be provided for every one Inch oiameter of significant tree to be repfacecf, SIGNIFICANT TREE CALCULATIONS PER KCC 16.52,156 TWE TOTAL NUMBER OF TREES TO BE RETAINED SHALL BE 10 TREES PER ACRE OR 5% OF SAiD TREES, WWATEVER 15 GREATER. TOTAL NUMBER OF TREES IS 214, 5% OF 214 = 11 TREES -OR- TOTAL 51TE SQUARE FOOTAGE = 335,412 S.F. = 1.1 ACRES 10 TREES PER ACRE = 11 TREES, REQUIRED TO BE (RETAINED 15 GREATER TOTAL -,RETAINED 6IGNIFICANT TREES = 60 42 'TREES SHOWN AT 10" CAL, OR UNDER = i TREE CREDIT/TREE = 42 TREES 9 TREES SHOWN AT 15" CAL, OR OVER =2 TREE CREDITS/TiREE = 18 TREES NUP'15ER OF PLANTED 51GNIFICANT TREES REQUIRED=1-I NUMBER OF PLANTED SIGNIFICANT TREES PROVIDED=23