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Home My WebLink AboutPlans38" 24" 16"NEW D/A65.72'S 00°48'58" E103.03'S 89°20'24" W 110.00'S 01°02'04" E99.63'N 89°20'24" E CONC. WALKWAY RESIDENCE L=44.40'CONC. WALKWAY 07°42'34"R=330.00'PARKWAYCONC. WALKWAYCONC. WALKWAYCONC. WALKWAYEX. HOUSE EX. HOUSEEX. HOUSE EX. HOUSEPORCH 2-CAR GARAGE INTERLOCKING PAVERS DRIVEWAY C O N C .WALKWAYR.W. W.F.R.W.R.W. PAD S/W WA L KW A Y GRASS GRASS BRICK CONCRETE D/A GAS WM SMH 48" 26" EX. HOUSE EX. HOUSEEX. HOUSE 681 680 679 678 677 676 678 679 680 R.W. PLANTER 3 3 3 1 1 2 2 2 4 5 VICINITY MAP NOTES 1. ALL EXISTING STRUCTURES SHALL BE DEMOLISHED UNDER SEPARATE PERMIT. 2. SEE APPROVED GRADING AND DRAINAGE PLAN FOR FINISH FLOOR ELEVATION AND GRADE ELEVATIONS. 3. SEPARATE PERMITS SHALL BE OBTAINED FOR FENCE WALLS. 4. AN AUTOMATIC RESIDENTIAL FIRE SPRINKLER SYSTEM IN ACCORDANCE WITH NFPA 13D OR SECTION R13.3 SHALL BE INSTALLED IN ONE AND TWO FAMILY DWELLINGS OR TOWNHOUSES INCLUDING ATTACHED GARAGES. (R309.6, R313.1, R313.2) 5. UPGRADE EXISTING WATER METER AND WATER SERVICE, CONTACT PUBLIC WORK FOR PROPER WATER SIZING. PROJECT DESCRIPTION LEGEND & ABBREVIATIONS PROJECT: OWNER: A.P.N.: LOT SIZE: ZONING: BUILDING HEIGHT: FIRST FLOOR AREA: CODE: TYPE OF CONSTRUCTION: OCCUPANCY: LANDSCAPE COVERAGE: SINGLE FAMILY RESIDENCE --- 5766-017-020 11,026 S.F. R-1 TWO STORIES (30'-0" MAX) 2,684 S.F. 2013 CBC, CGBSC, CEC, CMC, CPC AND LOCAL AMENDMENTS V-B W/ SPRINKLER SYSTEM - NFPA 13D R-3/U 6,188 SF / 11,026 SF = 56.12% CBW: CONC: D/A: DWY: EX.: FF: FL: INV.: P/L: PVMT.: RW: CONCRETE BLOCK WALL CONCRETE DRIVEWAY APPRON DRIVEWAY EXISTING FINISH FLOOR ELEVATION FLOW LINE ELEVATION INVERET ELEVATION PROPERTY BOUNDRY LINE PAVEMENT RETAINING WALLWM:WATER METER (403.43) ---400--- 10" 0 EP (398.57)TC (397.88)FL EXISTING ELEVATION EXISTING GROUND CONTOUR LINE EXISTING CONCRETE BLOCK WALL EXISTING BUILDING EXISTING STREET LIGHT EXISTING TREE TO REMAIN (DIAMETER) ELECTRIC POLE TOP OF CURB ELEVATION FLOW LINE ELEVATION ---------------------- N N.T.S. SECOND FLOOR AREA: 980 S.F. GARAGE AREA:430 (2-CAR GARAGE) PARKING:NEW 2-CAR GARAGE TOTAL PROPOSED AREA PER FAR CALCULATION: 3,664(LIVING AREA) +68(2-STORY OPEN'G) = 3,732 SF (< 4,734 S.F., OKAY) PROP. BDRY. DESCRIPTION:TRACT # 13894 LOT 10 PROJECT ADDRESS:1734 CLARIDGE STREET, ARCADIA, CA 91007 SITE PLAN KEYNOTES 1 2 3 4 5 6'-0" HIGH CONCRETE BLOCK WITH STUCCO FINISH (FINISH AT BOTH SIDE OF WALL) AT SIDE AND REAR YARDS, WITH GATES 4" THICK CONCRETE WALKWAY LANDSCAPE AREA PER LANDSCAPE PLAN CONCRETE PAVEMENT/DRIVEWAY HATCH INDICATES BUILDING 2ND FLOOR LINE ABOVE 1734 CLARIDGE ST., ARCADIA, CA 91006 E. GRANDVIEW AVE. W. SIERRA MADRE BLVDN. CANON AVE.N. SANTA ANITA AVE.CLARIDGE ST.LOT COVERAGE:2,684(1ST FLR.) +430(GAR.)+260(PATIO)= 3,374 SF ( 30.6%) PATIO AREA:141 S.F. (FRONT), 119 S.F. (REAR) ALLOWABLE FAR AREA:4,375 S.F. + (1,026 S.F x 35%) = 4,375 + 359 = 4,734 S.F. STAIR OPENING AREA:68 S.F. TOTAL LIVING AREA:3,664 S.F. 640 S.F.BASEMENT AREA: SITE PLAN 18" = 1'-0" A-1.0N 1734 Claridge Street Arcadia, CA 91007 112 North Earle Street San Gabriel CA 91775 Phone: 626.285.3408 Fax: 626.286.2037 Date: Drawn By: Checked By: Job Number: Revision: SINGLE FAMILY RESIDENCE - - - 2015.05.01 Protected Tree Report: Tree Survey, Encroachment, Protection and Mitigation 1734 Claridge Street Arcadia, CA 91007 Prepared For: Mr. Jonathan Soo CT Max 112 N. Earle St. San Gabriel, CA 91775 Tel: (626) 285-3408 Email: FJSoo@yahoo.com Prepared By: Michael Crane Arbor Care, Inc. P.O. Box 51122 Pasadena, CA 91115 Tel: (626) 737-4007 Email: info@arborcareinc.net March 2017 Table of Contents Summary of Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Background and Purpose of Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Project Location, Description & Tree Ordinance . . . . . . . . . . . . . . . . . . . . . . . . 2 Observations & Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Tree Characteristics & Health Matrix . . . . . . . . . . . . . . . . . . . . . 7 Construction Impact Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Findings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Further Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Appendix A - Photos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Appendix B – Soil and Root Protection Within the Protection Zone . . . . . . . . . . 15 Appendix C - Protected Tree Construction Impact Guidelines . . . . . . . . . . . . . . 16 Author’s Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Certification of Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Topographic Site Plan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pocket at back Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 1 SUMMARY OF DATA BACKGROUND & PURPOSE I was retained by the Project’s Architect, Mr. Jonathan Soo, of CT Max, to be the consulting arborist for the planned redevelopment of the property located at 1734 Claridge St. There are Protected Trees located on the property, and in the public right-of-way adjacent to the property. The proposed construction may impact these trees and this report will serve to both notify the City of Arcadia Planning Division of the extent of the potential impacts as well as to inform the builder of the proper protection measures which must be taken in order to preserve the trees. As part of my preparation for this report I made a site visit to the property on March 21, 2017. I met with Mr. Soo at that time to view and discuss the proposed construction plans as they relate to the preservation of the Protected Trees. Total number of healthy Protected Trees on property including street trees located in the adjacent public right-of-way area . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Total number of off-site Protected Oak and Sycamore Trees with canopies (driplines) encroaching onto the property . . . . . . . . . . . . . . . . . . . . 1 Total number of diseased/hazardous Protected Trees on site proposed for removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Total number of healthy Protected Trees to be preserved . . . . . . . . . . . . . . . . . . . 5 Total number of healthy Protected Trees to be removed . . . . . . . . . . . . . . . . . . . 1 Total number of Protected Trees that will be preserved, which will be impacted by construction within dripline (encroached) . . . . . . . . . . . . . . . . . . 5 Total number of Protected Trees with no dripline encroachments . . . . . . . . . . . 0 Total number of proposed mitigation trees to be planted on site . . . . . . . . . . . . . . 1 Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 2 PROJECT LOCATION, DESCRIPTION & TREE ORDINANCE 1734 Claridge St. is accessed from Sierra Madre Blvd., Five blocks east of N. Santa Anita Ave. Above map courtesy of Apple Maps. The property consists of a one story single-family residence that appears to be in fair condition. The home will be demolished and the property redeveloped into a two story single family home. The landscape is maintained and the woody plants and trees are in good condition. The Protected Trees appear to be in good health and structural conditions. The landscape will be renovated and all but one of the Protected Trees will be incorporated into the new design. N Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 3 This aerial view (courtesy of Apple Maps) has been illustrated to show the approximate boundary lines (orange). The locations of the Protected Trees are numbered in yellow. 2 N 1 3 4 6 5 Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 4 City of Arcadia Tree Ordinance Oaks, Sycamore, and many other tree species are Protected under the various tree ordinances. Here is a summary of the tree protection laws. On January 21, 1992 the City Council adopted Ordinance No. 1962 recognizing oak trees as significant aesthetic and ecological resources and establishing criteria for the preservation of oak trees. The regulations (Chapter 7 of the Arcadia Municipal Code) provide that the following oak trees shall not be removed, relocated, damaged, or have their protected zones encroached upon unless an Oak Tree Permit is granted: • Engelmann Oaks (Quercus engelmannii) or Coast Live Oak, California Live Oak (Quercus agrifolia) which have a trunk diameter larger than four (4) inches measured at a point four and one half (4 ½) feet above the crown root, or, two (2) or more trunks measuring three (3) inches each or greater in diameter, measured at a point four and one half (4 ½) feet above the crown root. • Any other living oak tree with a trunk diameter larger than twelve (12) inches measured at a point four and one half (4 ½) feet above the crown root, or, two (2) or more trunks measuring ten (10) inches each or greater in diameter measured at a point four and one half (4 ½) feet above the crown root. On March 3, 2015, the City Council adopted Ordinance No. 2323 amending the code to add Sycamore trees to the list of City's Tree Preservation Regulations. The protected trees are Oak and Sycamore trees. Protected Sycamore trees are defined as: • Plantanus racemosa (Sycamore) with a trunk diameter larger than six (6) inches measured at a point four and one-half (4½) feet above the root crown, or two (2) or more trunks measuring four (4) inches each or greater in diameter, measured at a point four and one-half (4½) feet above the root crown. On August 2, 2016, The City Council adopted Ordinance No. 2338 to add additional protected trees and unprotected trees to the City’s tree preservation regulations. In September, the City began protecting mature trees that are located within a required front, side, street-side, or rear yard setback area that are either larger than 12 inches in diameter or larger than 10 inches in diameter if there are multiple trunks. Below is a list of the unprotected trees: 1. Fruit trees 2. Fraxinus uhdei (Shamel Ash) 3. Ficuses – Exception: Ficus macrophylla (Moreton Bay Fig) 4. Eucalyptus 5. Ailanthus altissima (Tree of Heaven) 6. Arecaceae (Palm Tree) 7. Schinus terebinthifolius (Brazilian Pepper) 8. Ceratonia siliqua (Carob) 9. Betula pendula (European White Birch) 10. Grevillea robusta (Silk Oak) 11. Morus (Mulberry) 12. Acer saccharinum (Silver Maple) 13. Cupressus sempervirens (Italian cypress) 14. Populus Fremontii (Western Cottonwood) 15. Alnus rhombifolia (White Alder) 16. Populus trichocarpa (Black Cottonwood) 17. Populus ‘Highland’ hybrid 18. Salix lasiolepis (Arroyo Willow) 19. Liquidambars (Sweet Gum) Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 5 FIELD OBSERVATIONS & DESIGN ANALYSIS Refer to Site Plan located in pocket at back of this report, Tree Characteristics and Health Matrix on page 6, Construction Impacts Matrix on page 7 and Photos in Appendix A, page 9. Analysis regarding rootzone impacts are based on the type of impact, e.g, soil compaction, grading, and excavation; as well as the distance from the trunk that the impacts will occur. It is commonly accepted among professional arborists that a distance equal to three times a trunks diameter contains the structural roots responsible for keeping the tree upright. This critical rootzone area is defined as the root plate. Beyond the root plate the roots typically taper off into smaller, less significant sizes. These smaller roots are usually two inches in diameter or smaller and make up the rootmass responsible for water and nutrient uptake. Although roots of these sizes can be cut without significantly impacting health and stability it is advised that no more than 30 percent of the rootmass within the dripline is severed. The bulk of the rootmass is located within the top three feet of soil and root growth slows or halts when soil bulk density exceeds 1.60 g/cm3 for most soils. More information regarding rootzone impacts is provided in the Excavation and Root Pruning section of the Construction Impact Guidelines, Appendix B. Tree #1 – 24” Coast Live Oak: This street tree is located just off site but very close to the north property line. The existing driveway entry located a few feet from the trunk will be removed and relocated to the other (south) side of the property. Typical landscape renovation will encroach. No pruning of the live crown is required to complete the project. Tree #2 – 36” Coast Live Oak: Located in the back yard in a slightly raised planter surrounded by a concrete driveway. The garden wall containing the planter and the driveway will be removed. The foundation for the home will be built 19 feet from the trunk in the southwest quadrant of the dripline. Overexcavation may come as close as 15 feet from the trunk, and the rootzone is well buffered by the existing hardscape. A patio will be built in the overexcavated and compacted area. Typical landscape renovation will encroach. Some crown reduction and raising type pruning will be required to accommodate the second story roofline and exterior walls, but will be limited to small diameter cuts and will not remove more than 10% of the total live crown. Tree #3 – 28” Coast Live Oak: Located in a minimally irrigated turf area in the back yard. The foundation of the new home will be built 16 feet from the trunk in the northwest quadrant of the dripline. The required overexcavation will come as close as 12 feet from the trunk and will occur within the footprint of the existing home. Typical landscape renovation will encroach. Some crown reduction and raising type pruning will be required to accommodate the second story roofline and exterior walls, but will be limited to small diameter cuts and will not remove more than 10% of the total live crown. Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 6 Tree #4 – 20” London Plane: This tree is located in the front yard area near the south property line. The new driveway entry will be built 17 feet from the trunk and the driveway will come as close as five feet from the trunk on its north side. The driveway will be built on grade and no significant excavation or will be required to construct it. The garage will be built 17 feet from the trunk within the footprint of the existing home. Overexcavation is expected to come as close as 15 feet from the trunk. Typical landscape renovations will encroach. No pruning of the live crown is required to complete the project. Tree #5 – 14” Strawberry Tree: This tree is located within a foot of the existing home, on its north side. The new home will be built where the tree is located. It is proposed for removal and replacement. Tree #6 – 16” Jacaranda: This tree is located in the back yard near the east property line. The trunk is surrounded by concrete, and the concrete and other hardscape will be removed. The tree will be situated in a planter bed with an area of artificial turf beyond the planter. The foundation will be built 22 feet from the trunk on its west side. Overexcavation is expected to come as close as 17 feet. No pruning of the live crown is required to complete the project. Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 7 This chart includes all Protected Trees that are either located or encroaching on the property. It provides physical data collected from field observations. The trees have been surveyed and numbers correspond to the Site Plan included in this report. Tree numbers with an “os” indicate that the specimen is located off-site and a portion of the canopy extends over the subject property. TREE CHARACTERISTICS & HEALTH MATRIX CHARACTERISTICS HEALTH SIZE FORM CROWN CLASS AGE CLASS FOLIAGE DENSITY SHOOT GROWTH WOUND DEFENSE VIGOR CLASS TREE NUMBER SPECIES TRUNK DIAMETER (INCHES) APPROXIMATE HEIGHT (FEET) AVERAGE SPREAD (FEET) SYMMETRIC ASYMMETRIC DOMINANT CO-DOMINANT SUPPRESED YOUNG MATURE OVERMATURE NORMAL SPARSE DISEASE / INSECT AVERAGE POOR TWIG DIEBACK NORMAL POOR WOOD DECAY GOOD POOR DISEASED/HAZARDOUS 1 Quercus agrifolia 24 40 70 X X X X X X X 2 Quercus agrifolia 36 40 60 X X X X X X X 3 Quercus agrifolia 28 40 60 X X X X X X X 4 Platanus x hispanica 20 40 30 X X X X X X X 5 Arbutus unedo 14 25 20 X X X X X X X 6 Jacaranda mimosifolia 16 30 30 X X X X X X X Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 8 This chart includes all Protected Trees that are located on the property and any off-site Protected Native Trees (oaks and sycamores) encroaching on the property. It provides data collected from the analysis of construction plans. The tree has been surveyed and numbers correspond to the Site Plan included in this report. Tree numbers with an “os” indicate that the specimen is located off-site and a portion of the canopy extends over the subject property. For rootzone impacts, the required excavation is considered only for unbuffered areas. Areas that excavation will occur where existing similar infrastructure exists, e.g. overexcavation and compaction in the footprint of existing home foundation, grading for driveway in the footprint of existing driveway, are considered non-encroachments. CONSTRUCTION IMPACTS MATRIX TREE SPECIES SIZE & CONDITION ROOTZONE IMPACTS REQUIRED PRUNING OF LIVE CROWN TREE NUMBER Protected Trees: • Quercus agrifolia, engelmannii, and any other species of Quercus genus larger than 12” • Platanus racemosa • Any tree located in the public right-of-way • All other species 12” or larger that are not on the exemption list TRUNK DIAMETER (DBH) CONDITION Sides of tree where excavation (six inches or deeper) will occur Sides where excavation impacts are buffered by existing infrastructure Excavation will remain a distance of at least 10 X DBH from trunk Excavation will remain a distance of at least 5 X DBH from trunk Excavation will remain a distance of at least 3 X DBH from the trunk Removal or Relocation Additional light grading less than 6" deep to occur within dripline Estimated % of total root mass to be removed or severed No Pruning Required Pruning not to exceed 10% Pruning not to exceed 30% Number of cuts larger than 3" in diameter required Diameter of cuts for branch removals 1 Quercus agrifolia 24 Good - S Yes <20 0 N/A 2 Quercus agrifolia 36 Good W W Yes <20 0 N/A 3 Quercus agrifolia 28 Good W W Yes <20 0 N/A 4 Platanus x hispanica 20 Good E E Yes <10 0 N/A 5 Arbutus unedo 14 Good All n/a - - - - - - - - - - 6 Jacaranda mimosifolia 16 Good N N Yes <10 0 N/A Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 9 FINDINGS • Tree #5 is located within the footprint of the proposed home and will be removed to accommodate the design. This small tree can easily be replaced to parity with the 48” boxed nursery grown Cercis tree, which is designed into the front yard landscape plan. • All required deep and unbuffered excavation on the encroached trees will occur on only one side and is at tolerable distances from the trunks of the five Protected Trees; at least a distance equal to five times the trunk diameter. • Three large olive trees (Olea europea) tree located in the front yard will be removed. These trees are not protected as they are fruit trees, which are on the exempt list of protected trees. RECOMMENDATIONS As with many construction projects, soil compaction is the most preventable impact that will need to be monitored in order to provide reliable protection and long-term preservation of the trees. To prevent unnecessary soil compaction a protective fence must be installed around the Protected Trees before any demolition occurs. The goal is to enclose the largest possible amount of space underneath the tree so that the heavy equipment required for demolition and construction can be routed away from root zones. The recommended fence placements are drawn in dashed lines on the Site Plan of this report. The main haul route for the demolition phase and into most of the construction phase shall be the existing driveway. • Prior to demolition the contractor and consulting arborist shall meet on site to make sure fences are properly placed and installed and to review the goals for the tree protection plan. The location of the protective fences are drawn with a dashed line on the Site Plan included in this report. • Soil and root protection material may be used in areas where fences are not conducive, such as haul routes. Specifications for these materials are provided in Appendix B. • Tree Protection Zone fences shall be at least four feet tall and constructed of chain link fencing secured on metal posts. • The fenced protection zones may be altered during construction; however, any alterations of the fenced protection zones must be approved by the arborist of record. • The removal of existing turfgrass and other vegetation near the Protected Trees shall be done by hand. No rototilling or other deep cultivation or grading shall occur within the driplines. • Refer to the Construction Impact Guidelines in Appendix C for important general preservation measures concerning the different elements of this project. Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 10 APPENDIX A – Photos ABOVE: Looking north at Tree #1, a street tree located off-site, just north of the property line. BELOW: Looking east at Tree #1. The driveway will be relocated to the other (south) end of the property. 1 1 Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 11 ABOVE: Looking north at Tree #2, as well as Tree #6. Some modest pruning of Tree #2 will be required. BELOW: The concrete and garden wall will be removed and the area will become exposed soil landscape. 2 6 2 Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 12 ABOVE: Looking south at Tree #3. The new home will be built in the same footprint as the existing one. Some pruning will likely be required to accommodate the second story. BELOW: Looking south at Tree #4, a London Plane. 3 4 Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 13 ABOVE: The new home will have a similar setback from Tree #4 and the new driveway, which will come within a few feet of the trunk, will be built on grade. BELOW: Tree #5, and Arbutus, will be removed and replaced to accommodate the home’s foundation. 4 5 Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 14 ABOVE: Looking east at Tree #6, a Jacaranda. The concrete will be removed and the tree will be situated in a planter bed. BELOW: This group of three non-protected (fruit tree) olives located in the front yard will be removed. 6 Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 15 APPENDIX B - Soil and Root Protection Within the Tree Protection Zone If traffic cannot be kept outside of the Tree Protection Zone for the entire duration of construction, actions can be taken to disperse the vehicular load and protect the roots, minimizing soil compaction and mechanical root damage. These include: 1) Applying 6 to 12 inches of wood chip mulch to the area. 2) Laying ¾-inch thick plywood or 4x4 inch wood beams over a 4+ inch thick layer of wood chip mulch. 3) Applying 4 to 6 inches of gravel over a taut, staked geotextile fabric. 4) Placing commercial logging or road mats on top of a mulch layer. Stone, geotextile, and mulch exceeding 4 inches thick will need to be removed from the TPZ once the threat of soil or root damage has passed. Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 16 APPENDIX C - Protected Tree Construction Impact Guidelines Size and Distribution of Tree Roots – Taken from Arboriculture, Integrated Management of Landscape Trees Shrubs and Vines. Harris, R.W., Clark, J.W., Matheny N.P. Prentice Hall 2004. Roots of most plants, including large trees, grow primarily in the top meter (3 ft) of soil (see figure below). Most plants concentrate the majority of their small absorbing roots in the upper 150 mm (6 in.) of soil if the surface is protected by a mulch or forest litter. In the absence of a protective mulch, exposed bare soil can become so hot near the surface that roots do not grow in the upper 200 to 250 mm (8 to 10 in.). Under forest and many landscape situations, however, soil near the surface is most favorable for root growth. In addition, roots tend to grow at about the same soil depth regardless of the slope of the soil surface. Although root growth is greatly influenced by soil conditions, individual roots seem to have an inherent guidance mechanism. Large roots with vigorous tips usually grow horizontally. Similar roots lateral to the large roots grow at many angles to the vertical, and some grow up into the surface soil. However, few roots in a root system actually grow down. Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 17 The importance of soil Soil supports and anchors tree roots and provides water, minerals and oxygen. Furthermore, soil is a habitat for soil microorganisms that enhance root function. A soil’s ability to sustain tree growth is largely determined by its texture, structure (bulk density), organic matter, water and mineral content, salinity, aeration, and soil-microbe abundance and diversity. Soil physical properties Soil texture – the relative proportion of sand, silt and clay, is important because it affects water – and nutrient-holding capacity, drainage and aeration (gaseous diffusion). Soil structure is the arrangement of individual soil particles into clumps (aggregates). The net result is the formulation of larger voids between the aggregates which serve as channels for gaseous diffusion, movement of water and root penetration. Unfortunately, soil aggregates are readily destroyed by activities that compact the soil (increase bulk density). When this occurs, gaseous exchange, permeability, drainage and root growth are restricted. The influence of the organic matter content of soil properties is quiet significant. Its decomposition by soil organisms releases substances that bind soil particles into larger granules, which improves both soil aeration, and drainage. In essence, the breakdown of organic matter improves water – and nutrient-holding capacity and reduces bulk density. Furthermore, it is the primary source of nitrogen and a major source of nitrogen and a major source of phosphorus and sulfur. Without organic matter soil organisms could not survive and most biochemical processes in the soil would cease. Soil aeration, the movement and the availability of oxygen, is determined by both soil texture and structure. In general, compacted and finer soils, due to a higher proportion of small pore spaces (micropores), tend to drain slowly and hold less air than coarser, sandy, or well-structured find soils. Water retained in the small pores displaces oxygen and inhibits gaseous diffusion. The availability of soil water is largely determined by the size of the pore spaces between the soil particles and the larger aggregates in which water is held. Most of the water in the larger pore spaces drains readily due to gravitational forces. A relatively thin film of water, which is readily available to plant roots, remains following drainage. Much of water held within the smaller pore spaces resists uptake by plant roots because it is held tightly on the soil surfaces. Plant roots require an adequate supply of oxygen for development. Injury or dysfunction results when oxygen availability drops below a critical level. Root respiration is the first process to be restricted, followed by disruptions in growth, metabolism, nutrient and water uptake, and photosynthesis. Furthermore, the accumulation of high levels of carbon dioxide, produced by the roots during respiration can also impair root function. Reduced soil aeration resulting from soil compaction, flooding, excess irrigation, or Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 18 impervious pavement favors the development of crown rot (Phytophthora root disease). It also inhibits mycorrhizal fungi that enhance water and nutrient uptake and resist root pathogens. The forest floor under a canopy in most undeveloped forests and woodland settings is typically covered by a layer of fallen leaves and other woody debris. It is usually cool, shady, well-aerated, and relatively moist – conditions that favor normal root growth. When the natural leaf litter is removed and when a tree’s lower canopy is pruned up to provide clearance, the absorbing roots in the upper few inches of the soil experience higher soil temperatures and increased desiccation due to direct exposure to sunlight. Minimizing the Effects of Construction and Development on Tree Root Systems Activities that injure roots or adversely affect the root zone should be avoided or kept as far from the trunk as possible. Design changes or alternative building practices that avoid or minimize construction-related impacts should be considered and proposed when applicable. Soil Compaction Soils are intentionally compacted under structures, sidewalks, reads, parking areas, and load-bearing fill to prevent subsidence, and to prevent soil movement on slopes. Although unintentional, soil within the root zone of trees is often compacted by unrestricted foot traffic, parking of vehicles, operation of heavy equipment, and during installation of fill. Compaction destroys the soil’s natural porosity by eliminating much of the air space contained within it. It leaves the soil hardm impenetrable and largely unfavorable for root growth. The soil’s natural porosity, which allows for water movement and storage, gaseous exchange, and root penetration, is greatly reduced. Consequently, root growth and tree health suffer. Soil compaction is best managed by preventing it. Bulk density is used to describe a soil’s porosity, or the amount of space between soil particles and aggregates. High bulk densities indicate a low percentage of total pore space. Pavement Paving over the root systems of trees is another serious problem because it reduces the gaseous diffusion and soil moisture. Most paving materials are relatively impervious to water penetration and typically divert water away from a tree’s root zone. Cracks and expansion joints do, though, allow for some water infiltration into the soil below. Of greater concern, is the loss of roots from excavation to achieve the required grade, and the necessary compaction to prevent subsidence. Once the soil surface is compacted, a base material is then added and compacted as well. With that done, the surface can then be paved. Thus, pavement within the root zones of trees can damage roots and create Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 19 unfavorable soil conditions. One alternative to minimize pavement impacts is to consider placing the pavement on the natural grade over a layer of minimally compacted base material. To reduce sub-grade compaction, consider using reinforced concrete or asphalt over a goetextile blanket to help stabilize the soil. On-grade patios or paving that covers more than one-third of the tree protection zone (TPZ) should be constructed using permeable materials that allow aeration and water penetration. Soil under permeable surfaces should not be compacted to more than 80 percent. Excavation and root pruning Excavation within the root zones of trees should be avoided as much as possible. The extent of root pruning (selective) or cutting (non-selective) should be based on the species growth characteristics and adaptive traits, environmental conditions, age, health, crown size, density, live crown ration and structural condition of the tree. The timing of the root pruning or cutting is another important consideration. Moderate to severe root loss during droughts or particularly hot periods can cause serious water-deficit injury or death. When root pruning/ cutting is unavoidable, roots should be pruned or cut as far from the trunk as possible. Cutting roots on more than one side of a tree should also be avoided. Root cutting extending more than half-way around a tree should generally be no closer than about 10 times the trunk diameter. Recommended distances range from as little as 6 times trunk diameter (DBH) for young trees to 12 times trunk diameter for mature trees. The size of the TPZ should, however, be increased for over mature and declining trees and species that are sensitive to root loss. The minimum distance from the trunk that roots can be cut on one side of the tree without destabilizing it, is a distance equal to about three times the diameter (DBH) of the trunk. Roots severed within that distance provide little or no structural support. Root pruning or cutting distances from the trunk should be greater for trees that lean and/ or those growing on shallow or wet soil. In cases where the proposed grading will adversely affect trees designated for retention, special attention should be given to proper root pruning and post-construction care for injured trees. Where structural footings are required for foundations, retaining walls, etc., and roots larger than 2 inches in diameter will be impacted, consider design changes or alternative building methods. When excavation within 5 times trunk diameter is unavoidable, roots greater than 1 ½ inches in diameter should be located prior to excavation and then pruned to avoid unnecessary damage. Hand-digging or use of a hydraulic or pneumatic soil excavation tool is the least disruptive way to locate roots for pruning. Although mechanical root pruners make clean cuts, they are non-selective. A backhoe bucket, dozer blade or trencher will typically pull, rip or shatter the larger root, causing additional damage toward the tree. Once the roots that interfere with the structure being built, e.g., Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 20 foundations, footings, retaining wall, curbs, etc., are exposed, they should then be cut perpendicular to their long axis using a hand-saw, ‘carbide-tipped chainsaw’ or sharp ax, depending on size. Roots that are pruned in this manner typically regenerate new roots from near the cut. Roots exposed by excavation should be protected from exposure to sun and desiccation. Exposed roots that can not be covered with soil by the end of the day should be covered with moistened burlap or similar material. Roots can generally be cut in a non-selective manner when excavating near of beyond the dripline. Ripped, splintered or fractured portions of roots however, should be re-cut. The damaged portion should be removed using sharp tools. The cut should be flat across the root with the adjacent bark intact. Wound dressings should not be applied to pruned or damaged roots except when recommended for disease, insect or sprout control. The best approach to avoid water-deficit injury following root loss during the growing season is to provide ample irrigation. Irrigation should be considered prior to, during, and after root pruning. Watering schedules should also consider local soil conditions, climate, topography, time of year, species adaptability, extent of root pruning and tree health. If possible, irrigate the tree 7 to 10 days prior to excavation so that there is an adequate reservoir of soil water. Water can be delivered to large construction sites via water-tank trucks and applied directly to affected trees or stored nearby in plastic tanks. On relatively flat terrain, a 6 to 8 inch soil berm at the tree’s dripline should be constructed to act as a watering basin. On steep terrain, soaker hoses should be used. They can be placed across the slope or spirally around the trunk, from about six feet away to the dripline. In addition, a two to four inch layer of wood chip mulch should be applied to as much of the root zone as possible to retard soil water loss. Pruning foliage to compensate for root loss is not supported by scientific research and likely to result in slower recovery. Fertilization to stimulate root growth is generally unwarranted and may be counterproductive. Trenching within the Tree Protection Zone Trenching for underground utilities should be routed around the TPZ. When this is unavoidable, trenching within the TPZ should be done by ‘hand’ or using a pneumatic or hydraulic soil excavation tool, carefully working around larger roots. Roots larger than 1 ½ inches in diameter should not be cut. Dig below these roots to route utilities or install drains. A combination of tools can also produce satisfactory results, for example, a skillful backhoe operator under the arborist’s supervision can dig down several inches at a time and detect larger roots by ‘feel’ (resistance). At that point, as assistant can expose the root and dig around it. In this manner, the backhoe can then continue extending the trench though the TPZ. Tunneling (boring) through the TPZ is the preferable alternative. For most large trees, tunneling depth should be at least 36 inches. Tunneling should begin at the edge of the TPZ, but no closer than a distance equal to one foot of clearance for each inch of tree DBH. Tunnels should also be offset to either side Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 21 of the trunk. For trenching that extends only part way into TPZ, consider trenching radially to the tree trunk, as this is less harmful than tangential trenching. All trenches made within the TPZ should be backfilled as quickly as possible to prevent root and soil desiccation. Managing Root Injured Trees Root-pruned trees should be monitored for symptoms of water-deficit injury for a specified period following root pruning. Irrigation should be considered prior to, during, and after root pruning. Irrigation schedules should consider local soil conditions, climate, topography, time of year, species tolerance, extent of root pruning and tree health. Grade Change: Fill Soil Fill soil placed within the root zones of trees can have an adverse effect, particularly if the soil is compacted to support a structure or pavement. Soil compaction reduces aeration and water infiltration. Fill soil, die to textural changes, can also prevent water from penetrating the original soil layer below where the roots are. Furthermore, soil placed against the root crown and lower trunk can lead to root disease problems, especially if the soil near the trunk remains moist during the summer from irrigation. Alternatives to placing fills over roots zones shall be considered and proposed as appropriate. Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 22 AUTHOR’S CREDENTIALS Protected Tree Report: Survey, Encroachment and Protection Plan 1734 Claridge St., Arcadia, 91007 Michael Crane, RCA #440. March 2017 23 CERTIFICATION OF PERFORMANCE I, Michael Crane, certify that: • I have personally inspected the tree(s) and the property referred to in this report and have stated my findings accurately. • I have no current or prospective interest in the vegetation or the property that is the subject of this report and have no personal interest or bias with respect to the parties involved. • The analysis, opinions, and conclusions stated herein are my own and are based on current scientific procedures and facts. • My analysis, opinions, and conclusions were developed and this report has been prepared according to commonly accepted arboricultural practices. • No one provided significant professional assistance to me, except as indicated within the report. • My compensation is not contingent upon the reporting of a predetermined conclusion that favors the cause of the client or any other party not upon the results of the assessment, the attainment of stipulated results, or the occurrence of any subsequent events. I further certify that I am a member in good standing of the American Society of Consulting Arborists and the International Society of Arboriculture. I have been involved in the field of Horticulture in a full-time capacity for a period of more than 25 years. Signed: ____________________________ Registered Consulting Arborist #440; American Society of Consulting Arborist Board Certified Master Arborist #WE 6643B; International Society of Arboriculture Licensed California Agricultural Pest Control Adviser #AA08269 January 21, 2016 Date: ______________________________ Arbor Care Inc. Arboricultural Consulting & Plant Health Care info@ArborCareInc.net 626-737-4007 DATE: August 29, 2017 TO: City of Arcadia Planning Division 240 W. Huntington Drive, P.O. Box 60021 Arcadia, CA 91007 FROM: Michael Crane Project’s Arborist of Record SUBJECT: 1734 Claridge St.: Addendum to original Protected Tree Report Dated March 2017 – Preservation of three olive trees To whom it may concern: This letter is meant to inform you that the conceptual landscape plan prepared by Terry Lee Design Group along with Ben Lundgren and Associates now includes the three existing olive trees located in the front yard area. These trees will be preserved and incorporated into the landscape design as they qualify as Protected according to the city’s most recent tree ordinance. I had reviewed the previous version of the conceptual design in June 2107, and the revised plan is identical aside from the recent incorporation of the olive trees. The subject trees, which are now identified as Trees #7, #8 and #9 are all European olive (Olea europea) of similar sizes. They are mature specimens with approximate heights of 20 feet and average spreads of 20 feet, forming a codominant canopy with each other; and trunk diameters are each approximately 30 inches. They all appear to be in good health and structural condition. The trees have been tagged in the field on their trunks with their assigned numbers. The encroachments on the trees are tolerable as most all are on olives since they are widely regarded as the most tolerant broadleaf tree to root pruning that is commonly found in the landscape. For example, as transplanted trees, olives of this size and age are roughly dug from orchards with rootballs that don’t extend more than several inches beyond the root crown, their rootballs are wrapped in burlap and they are set on trucks, sometimes for days without any water and then installed; and they are relatively easy to establish despite the apparent abuse. The trees will be closely encroached upon, particularly Tree #7, but the encroachments will be very tolerable. The trees are technically fruit trees as this species is grown in agriculture for olive production; and fruit trees are on the city’s exempt list of Protected Trees; however, olive trees are an exception as they are widely used in landscapes for ornamental purposes and they are extremely drought tolerant which makes them an excellent candidate for Southern California landscapes. The landscape design specifies the areas around the trunks to be left unplanted and non-irrigated, which is the appropriate cultural setting. Please feel free to call or email me with any questions regarding the Protected Trees on this property. I have attached a scaled-down plan of the current landscape plan as well as photos of the olive trees. Sincerely, Michael Crane Project’s Arborist of Record Most current conceptual landscape plan showing the three olive trees (Trees #7, #8 and #9) along with the other Protected Trees and new plants and hardscape 7 8 9 ABVOVE: Looking north at the three olive trees (Trees #7, #8 and #9) located in the front yard. BELOW: A close-up of the trunks of the olives. The trees can very reliably be preserved and incorporated into the new landscape. 7 8 9 7-9 ROOF PLAN 1/4 = 1'-0" A-2.3 ROOF PLAN SCALE: 1/4"= 1'-0"1 1734 Claridge Street Arcadia, CA 91007 112 North Earle Street San Gabriel CA 91775 Phone: 626.285.3408 Fax: 626.286.2037 Date: Drawn By: Checked By: Job Number: Revision: SINGLE FAMILY RESIDENCE - - - 2015.05.01 FRONT ELEVATION1 LEFT SIDE ELEVATION2 SCALE: 3/16"=1'-0" 1734 Claridge Street Arcadia, CA 91007 112 North Earle Street San Gabriel CA 91775 Phone: 626.285.3408 Fax: 626.286.2037 Date: Drawn By: Checked By: Job Number: Revision: SINGLE FAMILY RESIDENCE - - - 2015.05.01 MATERIAL FINISH COLOR MANUFACTURER# 1 2 3 4 5 6 7 8 9 10 EXTERIOR FINISH SCHEDULE RIGHT SIDE ELEVATION2 REAR ELEVATION1SCALE: 3/16"=1'-0" 1734 Claridge Street Arcadia, CA 91007 112 North Earle Street San Gabriel CA 91775 Phone: 626.285.3408 Fax: 626.286.2037 Date: Drawn By: Checked By: Job Number: Revision: SINGLE FAMILY RESIDENCE - - - 2015.05.01 MATERIAL FINISH COLOR MANUFACTURER# 1 2 3 4 5 6 7 8 9 10 EXTERIOR FINISH SCHEDULE DETAILS AD-1 1734 Claridge Street Arcadia, CA 91007 112 North Earle Street San Gabriel CA 91775 Phone: 626.285.3408 Fax: 626.286.2037 Date: Drawn By: Checked By: Job Number: Revision: SINGLE FAMILY RESIDENCE - - - 2015.05.01 NEW D/A 65.72'S 00°48'58" E 103.03'S 89°20'24" W110.00'S 01°02'04" E 99.63'N 89°20'24" ECONC. WALKWAYRESIDENCEL=44.40'CONC. WALKWAY07°42'34"R=330.00'PARKWAY CONC. WALKWAY CONC. WALKWAY CONC. WALKWAYEX. HOUSEEX. HOUSEEX. HOUSEEX. HOUSE EX. HOUSESINGLE FAMILY HOUSE 1734 CLARIDGE ST. ARCADIA, CA 91006L-1071114T.L.JobDrawnSheetCONCEPTUAL1"=10'-0"07-29-16DateScaleAssessor's ID No. 5766-017-020 Sheet TitleProject BEN LUNDGREN & ASSOCIATES 2605 FAIRFIELD PL. SAN MARINO, CA 91108 TEL: 626-535-9544 FAX: 626-535-9534 CONSULTANT LANDSCAPE ARCHITECT, LIC. # 3109 DATENOREVISIONSTERRY LEE DESIGN GROUP 220 W. LESLIE DR. SAN GABRIEL, CA 91775 TEL: 626-285-6522 FAX: 626-285-6479 Prepared by LANDSCAPE PLANCONCEPTUAL LANDSCAPE PLANSCALE : 1" = 10'-0"PORCH2-CAR GARAGE123456EXISTING PROTECTED TREES INVENTORYTREE #BOTANICAL NAMECOMMON NAMETRUNKHEIGHT/DBHSPREADCONDITIONSTATUS123456QUERCUS AGRIFOLIACOAST LIVE OAK24"40'/70'GOODPRESERVEQUERCUS AGRIFOLIACOAST LIVE OAK36"40'/60'GOODPRESERVEQUERCUS AGRIFOLIACOAST LIVE OAK28"40'/60'GOODPRESERVEPLATANUS X HISPANICALONDON PLANE TREE20"40'/30'GOODPRESERVEARBUTUS UNEDOSTRAWBERRY TREE14"25'/20'GOODREMOVEJACARANDA MIMOSIFOLIAJACARANDA16"30'/30'GOODPRESERVEINTERLOCKING PAVERSDRIVEWAYCONC.WALKWAY