HomeMy WebLinkAboutWPO201800091 Correspondence 2019-02-26TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
February 25, 2019
John Anderson
Albemarle County Community Dev.
401 McIntire Rd
Charlottesville, VA 22902
608 Preston Avenue P 434.295.5624
Suite 200 F 434.295.8317
Charlottesville, VA 22903 www.timmons.com
RE: Lewis & Clark Drive Sewer Ext — VSMP Plan Review — WP0201800091- Comment
Response Letter
Dear Mr. Anderson:
We have reviewed all of your comments from December 27, 2018 and made the necessary
revisions. Please find our responses to the comments below in bold lettering.
SWPPP:
a. List WP0201800091 on cover of SWPPP.
WPO number has been added to cover of SWPPP
b. Sign/date Sec. 1, VPDES permit registration.
VPDES permit registration will be signed when a contract has been selected for the project.
c. Sec. 4/5: Include revise ESC plans, once comments addressed.
Revised ESC plans have been included
d. Sec.6/Exhibit:
Recommend ensure temporary sanitary facilities (porta-john) are accessible to
service vendor from existing paved surface.
Temporary sanitary facilities have been moved to road way near Paved
Construction Entrance
ii. Provide / show a trapping measure for treatment of vehicle wash waters.
Inlet protection has been provided adjacent to PCE.
iii. Provide / show lined concrete washout adjacent to PCE.
Lined Concrete Washout has been added and called out as requested
e. Sec. 9: Sign / date Certification for SWPPP Approval.
Once selected, the contractor shall sign and date the Certification for SWPPP Approval
CIVIL ENGINEERING I ENVIRONMENTAL I SURVEYING I GIs I LANDSCAPE ARCHITECTURE I CONSTRUCTION SERVICES
f. Sec. 11: Insert 21-p. CGP2014.PDF.
Page has been added to SWPPP as requested.
g. Sec. 12: Provide inspection logs similar to those included with Timmons Lewis & Clark
Road Ext. VSMP SWPPP / WPO201800073.
Inspection logs have been added as requested.
PPP:
1. See A / Sec.6 comments, above.
The Pollution Prevention has been revised accordingly.
SWMP:
1. SWM Plan: Project is eligible for alternative review of SWM requirements as a linear
project, per DEQ Guidance Memo No. 15-2003, Melanie Davenport, April 23, 2015
(Attached p. 4 conditions). Please incorporate 4 bullet items at the bottom of pg. 3 of
DEQ Memo into the VESCP Plan. Incorporate 111 bullet, p. 4 of Memo into SWPPP, Sec.6.
The 4 bullet points has been added to the cover sheet of the VESCP plan. The Memo is now
included in the SWPPP calling out specifically the "Guidance" section.
ESCP:
1. Revise plan title to reference WPO201800091.
Plan title has been revised accordingly.
2. Revise title to include VESCP; please do not ref. VSMP.
Title revised accordingly.
3. Plan is eligible for Linear Project review, which exempts project from SWM Plan
requirements provided certain specific requirements are met. As supplement to title
sheet Note, to remain eligible for linear project review and SWM Plan exemption,
provide the following, verbatim, on plan sheet/s. Project is required to accept clearing /
stabilization and other requirements. (Ref. DEQ Guidance Memo No. 15-2003 /
Attached)
The required notes have been added to the cover sheet.
4. Recommend note for San. MH Str. In fill similar to Note 3. On Lewis and Clark Road Ext.
Road Plan, C8.3, image below (SUB20800171). Engineering defers to ACSA on San. MH
installation requirements. Recommend edit: replace inlet with San. MH, VDOT with
ACSA.
This note has been added to the profile sheets as requested.
5. Show / label proposed ACSA easement. Acquire and record easements, per ACSA
easement document and plat requirements. Provide copy of recorded utility easement/s
to Engineering as soon as possible, with the understanding that easements will be
centered on the As -built location of installed utility improvements, which is typical for
ACSA sanitary transmission lines. Note: per ref. and use easement width equation listed
at ACDSM Fig., pg. 15. Easement width will exceed 25' at deeper trench locations. Ref.
image, below. (Corridor width flares at certain locations, which may coincide with
deeper trench locations.)
Per coordination with Richard Nelson of ACSA 20' standard easements centered on
the sewer pipe will be sufficient. Easement plats will be provided once sewer line is
constructed.
6. County Information Services GIS/Mapping recently cautioned Engineering when
reviewing design to reject design based on LiDar data. Provide field -run survey for
potions of project based upon LiDar data.Text of October 22, 2018 3:51 PM email: "Id
like to take a moment to remind you all that using GIS data (contours/topo, LiDar, etc.)
for engineering purposes is not the same as having a survey done by a licensed surveyor,
and as I understand it, violates state code. Our surveys by a licensed surveyor can be
used for design / construction. The 2016 LiDar dataset is from the USGS and the
metadata from the project does not indicate whether a surveyor who is licensed in the
state of Virginia was on the project or whether any surveyor certifies or guarantees the
accuracy. Its not my place to judge the intent of state code, but LiDar data is not a
survey, regardless of accuracy level claims. While I agree that the 2016 LiDar data is
more accurate vertically than the topo we have now, it still can contain unknown errors
and relies on the user to know what they are doing with the data since it includes far
more than just ground elevation points, has limited horizontal control, and cannot tell
you where parcel boundaries are located. This was a big deal about a year ago (see
attached documents) and came up again this month in Engineering, so please make sure
your staff is aware of this.
Note that on the elevation data on our data download page, we specifically say that our
GIS data cannot be used for design / construction / modification of real property."
Revise Timmons Group Sanitary Sewer Survey Notes, C2.0.
Per coordination between Joe Medley, LS of Timmons Group and John Anderson it has
been clarified that the data provides has been certified by licensed surveyors for both
surveys used. Please see sheet C2.0 for surveyor seals.
7. Include Paved Wash Rack detail on plans; see ACDSM, pg. 8 (PCE).
A paved wash rack detail has been added to sheet C3.0.
8. Label Limits of Construction linework, Sheet C3.1,or list 6.87 Ac., in ESC Legend.
The Limits of construction have been labeled in the ESC legend on each sheet.
9. Eliminate cross -contour silt fence. Silt fence is installed parallel with contours. Staggered
eyelash/scallop silt fence is an option.
Silt fence has been revised accordingly
10. Show and label steep slopes.
Streep sloped have been added as well as labeled on the existing conditions plan.
11. Provide sediment trapping / conveyance measures, as appropriate; please recall SF is
inappropriate for locations with upslope length >100'. Provide sediment traps. Provide
diversions, DD/RWD, as needed.
Clean water diversions have been added to divert the offsite water around pipe trenching and
installation. Clean water divisions will outfall to stabilized silt fence breaks at low points.
12. Provide San. Line stationing, at 100' intervals, for bond estimate, construction, and
inspection point of reference. Show in plan view.
Stationing intervals has been added as requested in plan view.
13. Provide temporary vehicular stream crossing detail (SC, VESCH Std. & Spec. 3.24). Label
SC wherever sanitary line or construction activity will cross or may impact a perennial
stream.
Detail has been added to plan as requested.
14. Acquire USACE permit/s, as needed. Provide copy of coordination correspondence with
USACE.
Acknowledged. Permit application is in process and permit will be provided once received.
15. For areas now in forest, show post -developed cleared utility RW corridor. Show as
proposed new tree line consistent with linear project environmental impact
minimization imperative.
A new tree line has been added to the post -developed area.
16. Include note/s that utility RW corridor will be managed as turf, not converted to
impervious stone access.
Notes have been added that the RW corridor will be managed as turf and not converted to
impervious stone access
17. Relabel CE, Sheet C3.1, as PCE. (Paved Construction entrance).
CE has been relabeled accordingly.
18. Provide / show PCE at north end of sewer line corridor, if CE is anticipated or may be
needed at north end.
A CE is not anticipated at the north end of the site due to the steep slopes and difficulty of
access from that point.
19. Revise Sequence of Construction, C3.0 to include placement of DID, RWD, ST, SC, etc. as
needed. Also, revise consistent with linear project requirements (i.e., daily limit on area
of disturbance, etc.). (Note: Revise comments are consistent with comments on a recent
RWSA water main project at Birdwood Golf Course, especially with respect to required
minimum VESCH measures and linear project requirements.)
Sequence of construction has been revised accordingly.
We have included copies of the plans for your review. If you have any questions or comments,
please feel free to give me a call at 434.295.5624.
Sincerely,
Jonathan Showalter, PE
Project Engineer