Laserfiche WebLink
<br />. , <br /> <br />Everest Development <br />25 February 1997 <br />Page 2 <br /> <br />Potential for Air Quality Impacts with Cumulative Development <br /> <br />Receptor Site from Centre Pointe Air Quality Study --> # I Cty D at #6 Cty C at <br /> Cleveland Cleveland <br />Maximum predicted 8-hour roadway CO concentration 6.23 ppm 5.25 ppm <br />8- Hour Background 1.41 ppm 1.41 ppm <br />Predicted maximum total concentration 7.64 ppm 6.66 ppm <br />Allowable roadway-only concentration if 9 ppm standard is just met 9.00-1.41=7.59 9.00-1.41=7.59 <br />Ratio of "allowable" increase of roadway-only concentration at these 1.22 1.45 <br />receptor sites above the level predicted for Centre Pointe alone <br />Total GSF to achieve the 8-hour standard assumini CO 755,000 GSF 898,000 GSF <br />concentrations at these receptor sites are simply linearly related to <br />GSE (This underestimates the allowable GSF based upon Site # I <br />since the project is not immediately served by this intersection) <br />"Allowable" increase in GSF if CO concentrations are a simple linear 136,000 GSF 279,000 GSF <br />function ofGSF (= total mimJs Centre Pointe) <br />Planned increase in GSF with Twin Lakes proposal 781,000 GSF 781,000 GSF <br />Potential "excess" GSF requiring air quality/traffic mitigation 645,000 GSF 502,000 GSF <br /> <br />The above simplified calculations suggest that there may be a potential for exceedance of <br />the8;;tm'Ur CO standard;~ cumulative impact of traffic from both Centre Pointe and <br />Twin Lakes are considered together. <br /> <br />It would appear to be in the interest of the developers and the City to take into account the <br />traffic and related impacts of both projects together if appropriate roadway design and <br />mitigation is to be provided. <br />