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   477 Temperance Street | St. Paul, MN 55101 | (651) 286-8450  <br />  <br /> Building a legacy – your legacy. <br />Equal Opportunity Employer | wsbeng.com  <br />K:\02170-270\Admin\Docs\MEMO-LEDStreetLights.docx <br />  <br />  <br />Memorandum <br /> <br />To: Honorable Mayor and City Councilmembers for the City of St. Anthony Village <br /> Mark Casey, City Manager <br /> <br />From: John Sachi, WSB & Associates, Inc. <br /> <br />Cc: Justin Messner, WSB & Associates, Inc. <br /> Todd Hubmer, WSB & Associates, Inc. <br /> <br />Date: January 6, 2017 <br /> <br />Re: Silver Lake Road Street Lighting Retrofit <br /> WSB Project No. 2170-27 <br /> <br /> <br />This memo outlines the costs related to a street lighting retrofit from conventional lighting to LED along <br />Silver Lake Road in the Cities of St. Anthony Village and New Brighton. The project is broken up into <br />three (3) separate areas (see attached map): <br /> <br />1) Silver Lake Road – 37th Avenue NE to Silver Lane <br />2) Silver Lake Road – Silver Lane to County Road E <br />3) Silver Lake Road – County Road E to I-694 <br /> <br />The lighting on the first segment is currently standard 30’ steel poles with 250 watt high pressure sodium <br />(HPS) lights. These lights will be replaced with a fifteen-foot (15’) fiberglass pole with a decorative lantern <br />style 3000k LED light head. The pole bases will be reused. The existing lantern lighting in St. Anthony is <br />a Vernon pole and fixture with a 150 watt HPS light. <br /> <br />The second segment has similar lighting as the first segment with thirty-foot (30’) steel poles and 250 watt <br />HPS light heads. In addition, at the signalized intersections there are cobrahead style 250 watt HPS <br />lights on mast arms. All of the lights along this segment will be replaced with thirty-foot (30’) anodized <br />aluminum poles with 4000k LED light heads. The light pole bases will be reused; therefore, no additional <br />light standards will be added. In addition, the lighting heads on the mast arms over the signalized <br />intersections will be replaced with LED heads. The signal poles and mast arms will remain in place. This <br />segment is a 50/50 shared segment between the City of St. Anthony Village and the City of New Brighton. <br /> <br />The third segment has the same characteristics as the second segment in both existing conditions and <br />proposed lighting. Since this segment is entirely within the City of New Brighton there will be no cost to <br />the City of St. Anthony Village. <br /> <br />Color temperature describes how yellow or blue a light source appears. The unit of measurement for <br />color temperature is “Kelvin”. Low color temperatures describe yellowish light, and high color <br />temperatures describe bluish light. The LED street light fixtures come in 3 different color temperatures <br />(3000k, 4000k and 5000k). As previously stated the existing lights along Silver Lake Road are high <br />pressure sodium which has a color temperature of 2200k. The following chart is provided to help visually <br />compare color temperatures. <br /> <br />