…is the symbol for an exhaust vent. This is not the actual exhaust vent proposed. For Illustration only.
We don’t know thephysical and performance characteristics of this equipment because there are no details on the floor plans.
• What is the physical size (dimensions and footprint)?• What is the diameter?• Who is the manufacturer?• What model?• How many cubic feet of air per minute does it move?• Is it a shiny reflective metal surface or a dull, muted one?• What is the sound output in decibels (dB)?• At what distance?• How long would the motor last under normal operating conditions?• Is it a variable speed motor?• What kind of drivetrain? Belt-driven? Chain-driven?
We don’t know the make/model and sound output…. of these devices…..
Any mechanical noise will create a nuisance for theadjacent rear yards, which are currently very quiet.
This 22-minute video, recorded in January 2013, is evidence of how quiet the yard is. deciBel, an app for measuring sound, was used, and the average dB reading is about 50-55 dB,Click on picture to see video equivalent to a quiet suburb.
Carbon Monoxide (CO) emissions from the parking garage
Carbon Monoxide (CO) emissions from vehicles in a parking garagecan be estimated using this equation: qCO = (20 + 0.1 l1) c1 + 0.1 c2 l2 source: http://www.engineeringtoolbox.com/garage-ventilation-d_1017.html
qCO = (20 + 0.1 l1) c1 + 0.1 c2 l2qCO = CO emission in cubic meters/hourl1 = average driving distance for cars in garagec1 = capacity of parked cars in garagec2 = number of cars driving through the garage/hourl2 = average distance for cars driving through garage/hour source: http://www.engineeringtoolbox.com/garage-ventilation-d_1017.html
Z.R. 33-292 regulates rear yard requirements when athe rear lot line of building in a C4-3 CommercialDistrict abuts the rear lot line of a building in the R5BResidence District.“In all districts, as indicated, along such portion of the rear lot lineof a zoning lot in a Commercial District which coincides with a rearlot line of a zoning lot in an adjoining Residence District, an openarea at a level not higher than indicated in the following table,shall be provided along such boundary and within the CommercialDistrict. Such an open area shall not be used for storage orprocessing of any kind.”
The table below Z.R. 33-292 lists the following:Districts Maximum Level of Yard Depth (in feet)C1,C2, C3, C4, C5, C6, C7 23 feet above curb level 30C8 Curb level 30This image also helps to interpret Z.R. 33-292: (R = Residential C = Commercial)
What does the language of Z.R. 33-292 mean?• A building in a C4-3 District that borders a residential district rear yard must have Open Area that is at least 30 feet deep.• Open Area must remain passive and not used for processing of any type - this includes the processing of air.
We, the residents of 32ndStreet, will no longer be able to quietly enjoy our homes and outdoor space due to air and noise pollution ifBSA 315-12-BZ is approved.
In addition, the air and noisepollution from the mechanical equipment will render ourpatios and gardens unusable,thereby significantly lowering our property values.
Z.R. 73-03(a) lays out guidelines for the Board ofStandards and Appeals when it comes to their findings.“(a) The Board shall make all of the findings required in the applicable sections of thisChapter with respect to each such special permit use of modification of use, parking or bulkregulations and shall find that, under the conditions and safeguards imposed, the hazards ordisadvantages to the community at large of such special permit use or modification of use,parking or bulk regulations at the particular site are outweighed by the advantages to bederived by the community by the grant of such special permit. In each case the Board shalldetermine that the adverse effect, if any, on the privacy, quiet, light, and air in theneighborhood of such special permit use or modification of use, parking or bulk regulationswill be minimized by appropriate conditions governing location of the site, design, andmethod of operation.”
What does the language of Z.R. 73-03(a) mean? • The Board of Standards and Appeals will ensure the adverse effects (including impacts to the privacy, quiet, light and air in the neighborhood) of such a special permit use are minimized by design and method of operation.• The Board of Standard of Appeals will measure the advantages of granting a special permit against the disadvantages.