Project: EIR for Carondelet High School Sports Complex
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1 Attachment 7 May 4, 2016 Project: EIR for Carondelet High School Sports Complex Prepared by: Ronald Zeiger, PE Scope of Project: The proposed outdoor sports lighting consists of the following: Soccer/lacrosse Softball Swimming Tennis The existing outdoor lighting conditions at the site consists of nineteen (19) lighted tennis courts, and general lighting of parking lot. The plan is to remove thirteen of the tennis courts to make room for the new sports fields, but leave six courts in place. The outdoor swimming pool does not have competitive lighting illumination. The residential street adjacent to the east side of the property has street lights, consisting of cobra-head fixtures mounted on 27 feet high poles. The locations of the existing sports lighting, general lighting and street lighting is indicated on the Existing Outdoor Lighting plan. General Discussion/Outdoor Sports Lighting: The potential environmental impacts of outdoor sports lighting are generally evaluated as light trespass ; being defined as light spilling onto adjacent properties. Additionally, outdoor sports lighting should also be considered by the impact of glare, which is the brightness of the fixtures, as seen from neighborhood residences. The physical aspects or characteristics of outdoor sports lighting can also be an issue with some residents, if: 1) the nighttime glow of the lights presents a visual intrusion for residents with regard to their views; 2) the light standards either individually or cumulatively block a view corridor. Design Criteria: The design of the proposed sports lighting system should provide light levels in accordance with recommendations of the Illuminating Engineering Society of North America (IESNA) RP-6-15 Recommended Practice for Sports Lighting. Using their recommendations, the average maintained illuminance should be: soccer/lacrosse field - 1 of 7
2 30 footcandles; for the softball field - 50 footcandles infield, and 30 footcandles outfield; for the tennis courts - 40 footcandles; and for the swimming pool - 30 footcandles over water and 10 footcandles on the deck. Regulatory Environment: The City of Walnut Creek has used a maximum level of spill light of 1 footcandle, measured horizontally, as the limit at property line. There is no other standard or criteria by which to evaluate potential impact of outdoor sports lighting. This is typical of all jurisdictions nationwide; currently, there is no legal or uniformly accepted definition of light trespass, or glare. Commonly, the terms are employed in reference to unwanted light at a property line disturbing the tranquility of an adjacent property owner. California presently includes standards for spill, trespass and skylight, that are included in CalGreen criteria of the 2013 Energy Efficiency Building Standards, but these standards do not include issues of light trespass associated with sports lighting. One method for analyzing the potential for light trespass from sports lights can be done by computing the illuminance (measured in lux or footcandles) on horizontal planes (typically at 3 feet above ground or pavement), and the maximum vertical illumination, at various locations distant from the sports field that may be of concern, and then comparing those results to the ambient conditions. For this project site, due to its suburban setting, the ambient nighttime conditions with the existing street lights, are as shown on the Existing Outdoor Light plan. An additional useful method for analyzing the potential for glare from sports lights is to compute the luminance (brightness) of the sports light fixtures (measured in candelas) as seen from perspectives away the sports fields. For this site this would be at the residence located to the east of the parking lot. Proposed Lighting Plan for Sports Lighting: Major Considerations Major considerations in the design of the sports lighting system includes: illumination level; pole heights and location; light output of lamps; optical control of fixture and glare shielding; and proximity to surrounding land uses. Site Plan Illustrated on the New Sports Lighting plan, are the recommended locations for poles for the facilities, including soccer/la cross, softball, tennis and swimming. This plan allows for the most efficient solution for the combination of number of poles and fixture performance. Light Fixtures The proposed sports field light fixtures use 1500-watt metal halide lamps, and have aluminum outer finish that is to be painted flat black, and glare control shields, as illustrated in the MUSCO product brochure included with this report. The fixtures are approximately 23 inches in diameter, provided with a unique optical system to allow precise beam control. The fixtures are aimed downward toward the fields, designed to 2 of 7
3 maximally redirect light toward the field by the special nature of their internal reflector system, and by means of external louvers and shields. The swimming pool light fixtures use 1000-watt metal halide lamps, in rectangular housing with flat bottom lenses. Poles The appearance of field poles, swimming pool poles, and flood light clusters, in the recommended plan are illustrated on the Light Pole Detail plan. Spill Light The computer predicted spill light values were analyzed at a distance of approximately 600 feet from the sports fields. The values are as indicated in MUSCO Illumination Summary, see Appendix. At 200-feet from edge of fields horizontal spill light levels are 0.0 footcandle, which indicates no horizontal light impact. Vertical illumination values (that is, light directly on vertical surfaces) are indicating values of 0.1 to 0.3 footcandle at 150-feet from edge of fields. These values are low and are similar to that produced by street lights. Glare from lights from the analysis does have the potential for disturbing neighbors. Therefore, further photometric aiming studies will be required. The School shall be required to re-aim and adjust the luminaires as needed during the initial nighttime testing of the field lights. This will insure that no excessive spill light remains uncorrected. There are at present no residences constructed on the nearby hills that would allow a direct view of the field. Though not included under trespass light, there will be indirect skylight, or a corona effect, due to reflected light off the fields into the atmosphere. This effect would be visible for some distance from the site. However, the magnitude is unpredictable, as it is dependant on weather conditions. Further, the School s Athletic Program should make this a lower intensity scenario than for that of a commercial or municipal sports complex. Typically, lighted sports events occur in the fall/early spring are of a limited number, typically Friday & Saturday, and invariably are over by 10:00PM. Operation Operation of the proposed field lights shall be from automatic time controls to turn OFF the lights at a pre-set time. The controls shall provide only for manually turning ON the lights. Additionally, it shall be possible to turn on the soccer/la cross field fixtures separately from those for the softball field. End of Narrative 3 of 7
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