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2017-070 Brinker Substation Tree Survey
Date: September 22, 2017 INFORMAL STAFF REPORT TO MAYOR AND CITY COUNCIL SUBJECT: Brinker Substation Tree Survey BACKGROUND: Report No. 2017-070 The Brinker Substation site was selected through the Public Involvement Process in late 2015 and then approved by the Public Utilities Board and Denton City Council in early 2016. Using the Denton Development Code, Subchapter 13, Freese & Nichols conducted a tree survey for the Brinker Substation site to determine how many trees of various categories would be removed. Although DME is exempt from any mitigation requirements as stated in Subchapter 35.13.7.A.2.c.v, ("Public Utilities may be exempted from these requirements upon filing route plans prior to tree removal or construction, which satisfactorily demonstrate that the proposed installation lies within routes previously established by a current Master Plan for transportation or public utilities, or within an existing easement recorded prior to the effective date of this ordinance") DME intends to follow the requirements stated in the Denton Development Code. The following exhibits show the substation site that was surveyed and the chart to determine the total caliper inches to be mitigated. Per this plan, and consistent with the Denton Development Code, DME will transfer $121,938 into the Tree Mitigation Fund in connection with the Brinker Road substation project. In addition to this, DME will prepare a landscape plan for the substation buffer. This is currently not complete but will be completed at part of the project. ATTACHMENT(S): Exhibit A: Brinker Tree Survey STAFF CONTACT: Brent Heath Executive Manager of Energy Delivery (940) 349-7180 Brent. Heath(a�cityofdenton.com tRs r � z 5 d .�' � � � . �1 y �k � ,�X _ * �* � t • �_. , � ,��� .. +. ,;: -t;� . � � `•'�`*. Lti ��� � �v , '���,� � ' . � ' �'�`,'�;'�� 1 �yly, � � � �, � �� � � . F , � k� ' � u � � � I� , � `►� .s ����'" ,��: k �- , + s .�. ' .� a� *' `�'� � •i � i � _ � � � y - . � r ] � � .. . ^ � .- ,� �•��, =,•... , � �". .��x� � � r ; �: � . �F�� , � —_� �� ` � � r #"' �►,; ,� : _ , ,� � ,�,�'�' �,; �'� ��. .. . � '� � :� �� � k-,�;� �. : �4�� ti� Y^ t � t ' '���� � }� �� _ ,�� . , � N �:_ �# ��:. 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" - � l+,� �l ., + �� r ' � - � -. � r �_ - �'1� �; =n� . � �r r�ePs �h" neH 35' Road euflar f � �-' -b � Protected Trees Prajecl Foo[Fr���[ � �� ��� ��, . 100 20�eet 11 F. i�ti F �� ��� � � AvoidanceAreas � Site goundzr:: � � • � 67 � i� "� CA z N � E" � o � Y � �. � � ❑ .p F, � C,Ii � �' 4J F � � V "� S"'� rn [� L 67 .SC C .� C7 ��__- LL�� �'___ �:� .� � FIGURE DENT�N �IItUNICIPAL ELECTRI� Brink r i n Tr r e ubstat o ee u ve Y Denton Development Code Mitigation Requirements: H istoric Trees — none Protected Trees — 807 caliper inches (mitigated at a 1:2 ratio) Quality Trees — none, exceeds 25% preservation requirement (40% remains) Large Secondary Trees — 168.5 caliper inches Secondary Trees — none, exceeds 12.5% preservation requirement (40% remains) Mitigate a total of 975.5 caliper inches to the tree fund. At an estimated $125 per caliper inch, this comes out to $121,938. DENT�N �IItUNICIPAL ELECTRI� Brink r tati n Tr r e ubs o ee u ve Y Denton Mitigation Rules Protected Trees ta Remo�e Quality Trees and Stands Large Secandary Trees Secondary Trees {quality trees larger than 18"j �Quality trees 6etween 6"-18"j {non-Quality trees larger than 18"} (non-Quality trees between 6"-18"j Tree Tag # p6H 4555 1 22 4203 2 28.5 4064 3 19 4548 4 26 413$ 5 31.5 4187 7 18.5 4100 8 21 41�3 9 21 41�5 10 21 41fl6 11 21 4�07 12 22.5 4099 13 22.5 4107 14 22.5 41�4 15 23 4186 16 27 4177 17 27.5 4178 18 29 Total �BH 403.5a Mitigativn Ratio 1:2 Total Caliper In�hes 807.�Q 4�°% of �uality Tree & 5tands will remain, which is mare than the 25°/ minimum # 4468 2 4150 3 4653 5 4324 7 4139 9 4291 1D 4334 11 428� 12 Total DBH Mitigation Ratio Total Caliper Inches 06H 18.5 19 21 27 18 18.5 22 24.5 168.5� 1:1 1b8.50 40% of 5econdary Trees will remain, which is more than the 12.5% minimum requirement Total Caliper Inches ta Mitigate 975.50 $ 121,938 DENT�N �IItUNICIPAL ELECTRI�