HomeMy WebLinkAboutApplication Files_82693_pg0438 Ucce Hang )?rust iy* rna
1 to Chapel Road. Two driveways off of the access road will have a manned security
house and gate to the studio project site. Under proposed conditions,the majority of
1 Site stormwater runoff and runoff from abutting properties will be collected and
treated by sediment forebays,catch basins with deep-sumps and hoods,and
biofiltration basins,then conveyed via closed pipe to Stormtech®infiltration
1 chambers,which will infiltrate all storms up to and including the 100-year event.If
permitted by CTDOT an emergency overflow connection will be provided to the on-
site drainage manhole with 48-inch pipe outlet,described above. The remainder of
1 the Site stormwater will discharge to various Low Impact Development(LID)
components,including biofiltration basins,water quality swales,infiltration basins,
existing infiltration areas,and/or porous pavement. Further descriptions of these
1 LID techniques are provided in Section 3 of this report.Where possible,the proposed
design maintains existing grading and drainage patterns.The stormwater
management system has been designed to protect the surrounding natural resources
from potential stormwater runoff impacts.
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A HydroCAD model,using TR-20 methodology,was developed to evaluate the
' existing and proposed drainage conditions on the Site.A total of 54+acres of land,
including off-site contributing areas,were analyzed.The results of the analyses
1 indicate that there is no increase in peak discharge rates between the pre-and post-
development conditions for the 2-,10-,25-,and 100-year storm events. The pre-and
post-development peak discharge values are presented in Table 3 at the end of this
report.
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The Stormwater Management Plan(the flan),including Best Management Practices
' (BMPs)for maintaining stormwater runoff quality both during and after
construction,was prepared in accordance with the applicable local,state,and federal
regulations. Details of the Plan are provided herein.
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1 72189 mkwgoisl72t6j*201atsffireinegel 2 Project Summary
72189Oranega Rcpott,lE[y 2077,doc