HomeMy WebLinkAboutWPO201100044 Review Comments Erosion Control Plan 2011-07-21� OF AL
,. vIRGI1`IZP
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project:
WPO- 2011 - 00044, Hyland Ridge Offsite Sewer ESC Plan
Plan preparer(s):
Mr. David Jensen, PE; W & W Associates.
Mr. Mike Myers, PE; Dominion Engineering
Owner's rep.:
Ms. Jo Higgins
Owner(s):
Pantops- Lakeridge LLC
Cascadia Partners LLC
Broadus Memorial Baptist Church
Plan received date:
8 July 2011 (plans dropped off at the county 13 June 2011)
Date of comments:
21 July 2011
Reviewer:
Phil Custer, PE
The erosion and sediment control plan for Hyland Ridge off site sewer improvements (WPO-201 1 -
00044), submitted on 8 July 2011, has been reviewed. The following comments must be
addressed prior to plan approval:
1. In order to obtain a grading permit for a plan that shows construction across more than one parcel,
each separate parcel owner must be party to the bond unless all necessary easements authorizing
all work have been recorded. I have copies of the documents recorded in DB 3483 Pg 98 and DB
3662 PG 444 and will forward them to the County Attorney's office for a determination whether
any other parcel other than 78 -57 will need to be party to the bond. I will forward his response
once it is received.
2. Please remove the original Sheet C -7 from the set since it is being updated and attached at the end
of the package.
3. Please extend the silt fence to the west side of the construction entrance to the existing pavement.
Please note that if dirt is tracked onto the pavement to the south, the county ESC inspector has the
authority to require a washrack and sediment trap to be installed at the project's entrance.
4. Please provide silt fence at the streambanks, parallel to stream flow, to protect the waterway from
the construction of the piers and approaching sewer lines.
5. A vehicular stream crossing will be prohibited unless Army Corps approval is given and a properly
sized and labeled SC is specified on the plan. Otherwise, please clearly note at the sanitary sewer
crossing on sheet C -7 and in the construction sequence that no stream crossing will be allowed.
Please also remove the reference on Sheet C -10 to a USC that does not exist.
6. Since the original plans approval, the county has added two more notes to its General Notes for
ESC plans. Please add these two notes to the plan. Please find the new note set in the current
edition of the design manual, available online.
7. The ESC plan relies heavily on cleanwater diversions which is not compliant with state - standards
and is generally not preferable. However, in this instance, not using cleanwater diversions would
result in large sediment basins below the work capturing mostly clean runoff and is not practical.
The cleanwater diversions should remain in the plan as previously approved but with the following
changes:
a. Three cleanwater diversions cross the sewerline. Since the alignment of the sewer line
will be used as a construction access route to the upper reaches of the line, the diversion
Engineering Review Comments
Page 2 of 2
will be running across an area that is crossed regularly by construction vechiles. For each
cleanwater diversion crossing of the sewer line /access road, please provide a properly
sized culvert and stone (similar to the VESCH Plate 3.24 -2) so cleanwater can pass
through the construction area without picking up sediment.
b. Please provide a designed crossection for DD3 and extend it past ST1. The way the
existing contours are currently surveyed, this water winds up in ST1. The north side of
the embankment of ST1 will also act as one side of the channel and is an erosion concern,
so please make sure a newly constructed adequate channel can reach the existing channel
on the church's property.
8. This comment is only advisory. This sewer line is being constructed in close proximity to a
Preservation Area that was approved in the Cascadia Rezoning Plan. The limits of disturbance
shown within this plan are acceptable for approval of the ESC plan. However, it is possible that
construction within these limits can damage some of the trees outside of the limits in the
Preservation Area. This would be a violation of the application plan and enforced by the Zoning
Department. County Inspection will be focused on this area of the project.
9. Once the plans have been approved, please provide a completed Bond Estimate Request Form to the
County Engineer to receive a revised ESC bond computation.
File: El_esc_PBC_WPO- 2011 -00044 - Hyland Ridge off site sewer improvements.doc