HomeMy WebLinkAboutSDP201000005 Review Comments Major Amendment, Final Site Plan 2010-02-25*-&A
County of Albemarle
Department of Community Development
Memorandum
To: Elizabeth Marotta, Current Development Project Planner
From: Phil Custer, Current Development Engineer
Date: 25 February 2010
Subject: Stone Robinson Elem. School Baseball Field Major Site Plan Amendment (SDP- 2010 - 00005)
The second submittal of the major site plan amendment for the Stone Robinson Elementary School
Baseball Field, received on 19 February 2010, has been reviewed. The following comments are provided:
1. The Planning Commission must approve the disturbance of the critical slopes before this project
can be approved. The engineering assessment of the waiver will be provided in a separate letter.
However, please provide more information regarding the sanitary sewer disposal system for the
school and confirm that the system will not be affected by the proposed site improvements.
(Rev. 1) Engineering assessment of the waiver will be provided in a separate memo.
2. Stormwater quality will not be required due to the minimal increase to the phosphorous load of the
site.
3. Detention of the 2 and 10 year peak flows will not be required because of the minimal increase in
peak flows and the limited detention provided in the downstream 15" culvert.
4. The site plan shall not be signed until the applicant is granted approval of an Erosion and
Sediment Control Plan for the work.
(Rev. 1) The Erosion and Sediment Control plan is currently under review.
5. Please provide the dates of the topographic survey and the FEMA floodplain revision on the plan.
[DM]
(Rev. 1) Comment has been addressed.
6. Please provide drainage pipe calculations for the new 18" pipes. Calculations should include a
drainage area map that includes watershed limits, acreage, hydrologic coefficient, and time of
concentration for each structure. The map and calculations may supplement the site plan and does
not have to be included within the sheet set.
(Rev. 1) Comment has been addressed. However, please update the pipe information in the
summary table in the upper right corner of sheet 3.
7. Please provide the design and calculations for the riprap channel downstream of SD -0 to the
existing 15" culvert. The channel must be non - erosive for the 2 -year storm and contained within
the channel banks during the 10 -year storm. (Moving the outlet of the 18" pipe farther south
( -50ft) will likely make the erosion and sediment control plan easier to design.)
(Rev. 1) Comment has been addressed.
8. Please include a detail of the cast -in -place junction box. The junction box should be designed to
withstand H -10 loading.
(Rev. 1) Comment has been addressed.
File: E2_fmj_PBC_sdp201000005_Stone Robinson Ballfield.doc