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2. Street Lighting - Silverbrook EstatesCity of Kalispell Public Works Department Post Office Box 1997, Kalispell, Montana 59903-1997 -Telephone (406)758-7720, Fax (406)758-7831 REPORT TO: Mayor and City Council FROM: James C. Hans2, P.E., Director of Publ SUBJECT: work. Session — Silverbrook Estates MEETING DATE: July 16, 2007 At a recent work session, the developer and engineer, CTA, for Silverbrook Estates requested a deviation from the City's current street lighting standards. Council directed that a specific proposal be developed and CTA has done this. Their proposal is attached. There are significant deviations from City standards, and these are noted in the Public works Department response, also attached. CTA will be present at the work session to outline their proposal and to address the deviations from City standards. They have also been encouraged to outline how the concerns of City Council, specifically that pedestrians are not forced to walk on public sidewalks in the dark will be addressed. July 16, 2007 work session Silverbrook Street Lighting.doc -:: City of Kalispell Publi*c Works Department . .. . . . ... ........... ........... Post Office Box 1997, Kalispell., Montana 59903- 1997 Telephone 406758-772U, Fax 406755-783 I July 12, 2007 Wayne Freeman, Di recto r-CTA La ndworks 10180 Cottonwood Road Bozeman Montana 59718 Via email RE: Street Lighting Revisions — Silverbrook Estates Your Letter Dated July 6,, 2007 Dear Mr. Freeman: We have examined the referenced submittal and found the proposed lighting does not meet the City Lighting Standards except for Silverbrook Drive. The lighting layout for the remainder of the residential streets within the development deviates from the City lighting standards as follows: 1. The minimum average illumination of 0.3 foot-candles at the outer edge of the sidewalks has not been achieved (industry wide design guides recommend a minimum of 0.2 foot -candies of illumination for sidewalks). The proposed lighting provides 1 foot candle directly under the lurninaire and 0.25 at the outermost edge of the illuminated area. 2. The benchmark uniformity ratio has not been achieved. I The lights are not spaced to a consistent interval. The majority of the residential sidewalks receive no illumination at all. There are many areas along the sidewalks that have gaps up to 300 feet where there will be no measurable illumination. We understand that CTA will bring this issue before the City Council during a work session Monday, July 16, for discussion. We would recommend that you should be prepared to discuss the following: 1. How your design deviates from the City standard. 2. The lighting level provided and how it deviates from the City Standard and how your design addresses the dark spots where there is no measurable illumination. 3. The design fails to ensure pedestrians are not walking in the dark. The solution for the dark areas does not lie in relying upon people's porch lights. For sidewalk lighting you may want to consider bollards placed on the sidewalk side of the street with shielding to prevent the light from impacting the street side. If you have any questions, please do not hesitate to contact this office, Sincerely, Frank Castles, P.E. Deputy Public Works Director/Assistant City Engineer Cc: Jim Patrick, City Manager Jim Hansz, Public Works Director/City Engineer Tom Jentz, City Planner Deb Rasa, CTA Howard Mann 93 and Church, LLC 3154 Parkwood Lane Bigfork, Montana 59911 July 6, 2007 City of Kalispell Public Works Department Attn: Frank Castles, P.E. 306 1 st Avenue East P.O. Box 1007 Kalispell, MT 59903 Re: Street Lighting Revisions - Silverbrook Estates Dear Mr. Castles: Recently, we have been having discussions with you about the street lighting at Silverbrook Estates. Our desire is to create a lighting network that meets safety concerns but does not provide excessive lighting throughout the development On Monday .June 13, 2007, CTA presented a proposal on our desired lighting pattern to the City Council in a workshop format. Our preferred lighting pattern utilized a decorative fixture and spaced the lights at a minimum 700' apart with lighting at every intersection. Silverbrook Drive, which is the main Boulevard through the subdivision would meet the city's lighting standard. The result of the meeting is that the City Council instructed CTA to forward a proposal through the Public Works Department for formal Council review and if appropriate, approval.. Attached you will find our proposed lighting patterns. We have made modifications to our original concept. This lighting plan places lights in average distances of 200 to 300 feet apart. There are two locations where lights are 500 feet apart. Lights occur at every intersection and Silverbrook Drive follows the City Standard. Light standards have been raised to 24 feet but we retain the ability to meet the City's Dark Sky Initiative. It is important to note that: ■ CTA has raised the fixture height to 24'9 ■ Increased the amount of light fixtures significantly from the previous plan, Decreased the spacing of the fixtures, ■ selected different fixtures than previously presented widening the lighting pattern, ■ There will be a significant amount of light emitted by porch lights, driveway and yard lights in between the street light fixtures. We believe this lighting pattern best represents all interested parties needs. We would like to get this proposal to the City Council for their review as soon as possible. Please let me know if I can do anything else to expedite this process. Best Regards, Wayne Freeman, Director-CTA LandWorks CC: Torn Mentz, City of Kalispell James Patrick, City of Kalispell Howard Mann, 93 and Church, LLC Deb Rosa, CTA r SI LVERBROOK ESTATES BID PACKAGE #2 SUBDIVISION ROADWAY & KAC..ISPE MT f RN �. n r .. .,. .. _ ... .. '� .... �. : �..=,•t:�.:. �.....:....^v: _ .. :::Y.�'•-� .,.„�,°� ats,"'>�.�.'�'„'il!-i(.:nw r!,;�F::::..:'w;;:�xii:'i'%::'.va�. �.'._a'��� �%.>.::::':�: �%'�.�='>:.,::✓'r::�"i::;-;':.:"�':Yn:-�:i '::� '':a:�i�..:.. . ...t.. .. .� r, c r. �... ti .r�r. .._, ......,...,.::-.,..:.::........,.. ,..A.,.n.-..x ., .�.•>r: n�s�x. '�.'a �,�i•'� - - .. � _ . .. .. ...... ..._ . _ �.. ....... .• .,_ _... .. .. r .. .. .. ..... s.,,...K<�s. x i.. r'. .,s-sr:r .. �'.�="rx�=.,':�;�:';`.;z:;;a r -':� �m"•q:�: ....... .... ._.. ..F.. ... . ...Al .. .. .. .. _ . f ...... _ ... .. ... .. .. .. •;•tom::--. ./ , - _._ ....... f.. . ..n _.... _...... �:'.:•::. _...., ..