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DIR-2004-07b CITY OF CUPERTINO --------------------------------------~----~--------------- -,----------,-------_._----~_._-~~_.__._------,---------------------- 10300 Torre Avenue, Cupertino, California 95014 (408) 777-3308 To: Mayor and City Councilmembers Chair and Planning Commission ~'.-' From: Steve Piasecki, Director of Community Developmen~ Date: June 23, 2004 Subj: DIR-2004-07: Minor Modification of U-2002-01 to allow the removal and replacement of two dead White Alders (Alnus rhombilfolia) at an existing restaurant at 10690 N. De Anza Blvd. -_._----------~--_._--------------------'----'-----~_.----~-_._-_._--- -----------------------------------~----~---------------------- Chapter 19.132 ofthe Cupertino Municipal Code allows for administrative approval of minor changes to a project. The Director reports his decision to the City Council and Planning Commission in time to aUow any Councilmember or Planning Commissioner to appeal the decision within fourteen calendar days. Application: DIR-2004-07: Minor Modification of U-2002-01 to allow the removal & replacement of two dead White Alders at an existing restaurant at 10690 N. De Anza Blvd. Two lO-inch diameter White Alders in front ofBJ's Restaurant died. This was quite evident by the lack of green foliage, the presence of large amounts of fungus around the trunks of each tree, and the sloughing off of the bark from the upper main branches. The tree deaths were confirmed by a certified arborist who noted extensive oak root fungus and decay and an infestation of Flat headed Alder borer, a destructive pest. Action: The Director of Community Development deems the modification minor and approves the tree removal on the attached plan titled "BJ's Restaurant, 10690 North De Anza Boulevard, Cupertino, California 95014" consisting of one sheet labeled P-l with the following condition of approval: The two dead white alders shall be replace with two 24" box trees from the recommended tree list of the North De Anza Blvd. Conceptual Zoning Plan. In addition the replacement trees shall be resistant to oak root fungus and able to tolerate a watered lawn environment. This approval of the modification is effective June 23, 2004. The fourteen calendar day appeal period will expire on July 7, 2004. Enclosures: Exhibit A: Arborist letter dated 2/23/04, Plan Sheet G: P lanning/Pdreports/DlRreportslDir- 2004-0 7 February 23, 2004 Terri Rotman / Bl Brew House 10690 N. De Anza Blvd. Cupertino CA, 95014 Dear Terri Rotman, At your request, I have performed an inspection of two White Alders [Alnus rhombifalia] at the front of your property. The trees were not climbed. The results of the inspection are as follows: The root crowns and the complete circumference of each tree's lower trunk have extensive oak root fungus and decay. On the upper main stems and limbs the bark is falling off exposing wood with tunnels/galleries caused by an infestation of Flatheaded Alder borer (Agrilus burkei). Please see enclosure explaining the destruction caused by this pest. It is my conclusion that the combination of the oak root fungus and the extensi ve borer damage, plus the trees being located in a watered lawn area, have all contributed to the decline and death of both trees. Due to the advanced decay observed in both trees, their location near a sidewalk poses a hazard in my opinion. I would suggest that both trees be removed to grade as soon as possible. Consideration should be given to replacement trees that are oak root fungus resistant and able to tolerate a watered lawn environment. Respectfully submitted, Paul Lamm I.S.A. Certified Arborist Enclosure: Statement of Limiting Conditions Two page flier on Flatheaded Alder borer * .. Ei~i bi+: A Statement of Limiting Conditions Please note: Recommendations given by Paul Lamm of Tree Health Professionals" Inc. are based upon research and recommendations from the agriculture and horticulture departments of major universities in the United States, primarily the University of California, and also from the International Society of Arboriculture. Due to the variability and unpredictability of plant materials, hidden defects, soils, climate, workmanship and various other factors, Paul Lamm of Tree Health Professionals, Inc. can make no warranty, expressed or implied, regarding any recommendations given. The owner or person(s) responsible for implementing any recommendations given by Paul Lamm of Tree Health Professionals, Inc. assume(s) all risks involved, and agree(s) to indemnify Paul Lamm of Tree Health Professionals, Inc. and hold Paul Lamm of Tree Health Professionals, Inc. harmless from any loss or cost of damage, including but not limited to attorney fees and defense, costs of claims by the undersigned, or by third parties. Regarding trees: The measures noted within this report are designed to assist in the protection and preservation of the trees mentioned in this report, and to help in their short and long term health and longevity. This is not however, a guarantee that any of these trees may not suddenly or eventually decline, fail, or die, for whatever reason. Because a significant portion of the roots are far beyond the dripline of the tree, even trees that are well protected during construction often decline, fail or die. Because there may be hidden defects within the root system, trunk or branches of trees, it is possible that trees with no obvious defects can be subject to failure without warning. '. ~ $ mature. which is sometimes frothy while, may exude around bor~ ingsites and bark may become cracked. Mature larvac arc yel- low The thorax is enlarged just behind the head. Larvae fOHn creamy white 1.0 dark pupae under the bark surface in the spring. Adulls emerge and [rom April through August. Both have one gener- ation ;, year. Provide proper cultural care to keep trees vigorous and resistant to allack by borers. Protect trees from injuries (see Chapter 3) and prevent slH1scalJ and other damage from abi- otic causes (see Chapler Prune out and dispose of dead limbs and remove dead and dying trees where borers breed. PACIFIC FLATHEAOED BORER larua adult ,I D t/2 t Le, 'j \' I I , \ I I ' , I 1", P"'l'"TTTI' ,Il;'!!! I I n I! 1 I ! f mm 10 20 The aoull Pacific Harheaded borer is dark bronze, gray, or a mottled (:oppery color. The Pacific f1alln~adcd borer lan'a is broad and flat in l,he fmlH and nanow and tapered toward the lear. 158 l NSEClS. M lIES, ,u.,: D SNAilS A'i D SLUGS Flatheadcd Alder Borer Agr-i'us bur-Ite; FLATHEADED ALDER BORER adull .,o~' ~ MANAGEMENT Provide proper cultural care and pro- lect trees lrorn injury, as detailed ;Jhove ror bark becLlcs. rlatheaded borers auack vigorous trees. Provide white alders, Alnus rhombiJo- lin, with frequent irrigation through- Ollt their lives; these trees arc native to sites near pern"lanent water. Alders grow poorly in western landscape areas where summer drought prevails ami become very susceptible to borer attack. Do not plant alders un less you Gill provide frequent Con- sider replacing problem trees and planting Italian alder, Alnus ("ordma, which is resistant 10 the borer. Dur- ing late summer or fall when adult beetles are not active, prune out and dispose of all branches showing bleeding, swelling, dieback, or other evidence of larval infe';t~!ion, Avoid pruning hosts for at least a month Wel spots and darK staining nn this alder Inlnkare characteristic or !lat- headed borer damage. before ancl during the season when adults are aClive. Do. not prune white alder auyUme between March and the end of Mayas egg-laying adult beetles are apparently attracted to recent. pruning wounds. Praperly timed insecticide sprays may reduce beetle att.acks, but do. not suhstitute insecticide applications [or proper cultural care or trees are still likely 10 die. If an application is planned, beginning the first of April inspect leaves for adult feeding holes and look for adult beetles during mid to lale afternoon by examining foliage and branch beating. Foliage and wood can be thoroughly sprayed with a persis1ent insecticide when adults are active, usual.ly one time about mid-April and again about 3 to 4 weeks lateL Insectiddesare no.t effec- tive against larvae beneath bark. Oall Twig Girdler Agrilus angeHcus Oak twig girdler is a llatheaded borer !hal aHacks oaks throughout Califor- nia, especially live oaks in southern California. The adult beetle is dark brownish copper and emerges around June in coastal areas and in May fur- ther inland. Jhe ti,ny eggs are laid singly on the bark of young twigs. The whitish larva bores through the bark and spends 3 to 6 months chew- ing a linear mille several inches long in the direction of older twigs. 11 then begins to girdle or mine spirally around the twig, causing terminal foliage to die and turn brown. During the next season, it extends its mine a foot or more down the branch, GltlS- more extensive patches of foliage to die. It bores into the center of the branch, then mines back oul toward the It has killed and pupates in wood near the surface of the twig. i\bout 24 months after laid as an egg, the adult gnaws through the bark and emerges. An oak twig girdler infestation is first indicated by scattered patches of whitish brown leaves throughOUlthe canopy. Leaves are dead, hut. have not been chewed and exhibit no surface scraping, These symptoms of twig girdler damage may be confused with oak twig hlight and branch (heback diseases (Chapter 5). To distinguish the twig girdler from disease, peel baek the bark of the larger twig at the junction of live and dead foliage, A flauened, spiral tunnel, possibly con- wining coarse, dark brown frass and a larva, should be visible in twig girdler-infested oaks. Unlike the hor- ing into limbs or trunks that occurS only on damaged or weakened trees, the twig damage can be unsi.ghtly, but does not significantly harm trees. MANAGEMENT Native California oaks are adapted to drought; avo.id planting turf or irri- gated ground covers under them as frequent irrigations during warm weather makes the oaks susceptible to oak rool disease. However, drought-weakened trees are especial- ly pront~ 10 twig girdler attack and urbanization often reduces the natur~ al availability of soil moisture. It may be appropriate to irrigate urban oaks once every 1 to 2 months during the warm dry season. AUow the water 10 soak deeply into the soiL Irrigate near the oUler part of the canopy, not dose to the trunk. Prune infested branches to restore the oak's aesthetic quality. At least six species of parasitic wasps attack oak OAK TWIG GIRDLER ~ INSEers, MiTES. 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Hedding Street, l Floor AUG 2 5 2004 East Wing—Business Division BRENDA DAVIS, County Clerk-Recorder San Jose, CA 95110 Santa C(ara Courrty By Deputy Project Title: DIR-2004-07 Project Location -(be specific): 10690 N. De Anza Boulevard Project Location -(City):Cupertino Project Location -(County): Santa Clara Description of Project: Director's Minor Moiification to remove and replace two dead alder trees at an existin� restaurant site Name of Public Agency approving project: C'ity of Cupertino Name of Person or Agency carrying out project: Bob Salessi BJ's Restaurant & Brewhouse) Exempt Status: (check one) Ministerial (Sec. 21080(b)(1); 1526E); _ Decla.red Emergency (Sec. 21080(b)�;3); 15269(a)); _ Emergency Project (Sec. 21080(b)(4►; 15269(b)(c)); x Categorical Exemption. State type as�d section number: Section 15304. Class 4 . Minor Alterations to Land _Statutory Exemption. State code number: Reasons why project is exempt: Removal o f dead trees is categ,oricallv exempt from environmental review Lead Agency Contact Person: Colin Jun A rea code/telephone number (408) 777-3257 � � 1 Signature: D;�te: June 23, 2004 Title: Senior Planner