HomeMy WebLinkAboutWPO202000007 Correspondence 2021-04-06 (3)608 Preston Avenue
P 434.295.5624
Suite 200 IF434.295.1800
T I M M O N S GROUP
Charlottesville, VA 22903 www.timmons.com
April 6, 2021
John Anderson
County of Albemarle
Dept. of Community Development
401 McIntire Rd, Rm 227
Charlottesville, VA 22902
RE: Hark Vineyards Tasting Room - VSMP Plan Review - WP02020-00007 -
Comment Response Letter
Dear Mr. Anderson:
We have reviewed all of your comments from (Rev. 1) February 22, 2021 and
made the necessary revisions. Please find our responses to the comments
below in bold lettering.
A. Stormwater Pollution Prevention Plan (SWPPP)
The SWPPP content requirements can be found in County Code section 1 7-405. A
SWPPP must contain (1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures
necessary.
1. Sec. 1, Registration Statement is incomplete. Complete Sec. 1 as
condition of VSMP / WPO plan approval.
a. Sec. I.A. Operator/ Perm ittee information: Section is blank; please
complete. (Rev. 1) Not addressed.
Section has been checked and is completed.
b. SeE.
W.B./Estimated p Et dates:
Complete
c. fog W C/Commo—n DIa., of Development: please Eheck yes. Review
error; withdrawn.
d. Sec. VI/Certification: Please complete. (Rev. 1) Not addressed.
ENGINEERING I DESIGN I TECHNOLOGY
Section will be completed once a contractor selection has been
finalized.
e. New: Sec. II.B., C., E., G.1 - Complete all sections of Registration
Statement. Please QC
Sections were completed on previous submittal.
2. Sec. 4, 5: Update these sections with revised ESC and SWM plan sheets,
once comments are addressed. (Rev. 1) Persists.
Section have been revised with updated plans.
3. Sec. 6.A / Exhibit: Indicate location rain gauge. (Rev. 1) Addressed. As
follow-up:
a. Provide silt fence downslope of stockpile.
Silt fence has been provided around stockpile.
b. Provide depression / small trap to collect vehicle wash waters (not
VESCH design /small).
A depression has been called out to collect vehicle wash waters.
c. Provide catchment / small trap to intercept runoff from dumpster,
mortar mix, temp. toilets. These items are shown on ungraded
slopes with no downslope catchment, or barrier to overland flow.
Dumpster, mortar mixing station, and temporary toilets have been
relocated and are now uphill of a depression / catchment for runoff.
4. Sec. 6.E. - List named individual responsible for pollution prevention
practices prior to VPDES permit registration. (Rev. 1) Persists. List named
individual prior to VAR10 CGP Registration for state permit.
This section will be completed once a contractor has been selected.
5. Sec. 8. - List named individual qualified to perform compliance
inspections prior to VPDES permit registration. (Rev. 1) Persists. List
named individual prior to VAR10 CGP Registration for state permit.
Section will be completed prior to registration permit once a contractor and
subs have been finalized.
6. Sec. 9., Signed Certification: Individual who prepared SWPPP document
must sign as condition of VSMP / WPO plan approval. Albemarle cannot
register project with DEQ until SWPPP Sec. 9 is complete. (Rev. 1) Persists.
Section will be completed once a contractor has been selected.
7. Sec. 11 - Include copy of 26-p 201 9VAR10 VPDES General Construction
Permit. (Rev. 1) Addressed.
8. Sec. 12 - Include template inspection forms. (Rev. 1) Addressed.
9. Include 2019 Notice of Termination form. (Rev. 1) Not Addressed.
Notice of termination has been included with SWPPP. See section 13
10. Revise SWPPP title to include ref. to VSMP / WPO2020-00007. (Rev.
1) Addressed.
B. Pollution Prevention Plan (PPP) - See above. Limited follow-up items.
The PPP content requirements can be found in County Code section 1 7-404.
C. Stormwater Management Plan (SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or
disapprove a SWMP. This plan is disapproved for reasons listed below. The stormwater
management plan content requirements can be found in County Code Section 17-403.
1. A SWM Facility Easement Plat is required for this project. (Rev. 1)
Withdrawn. Initial comment is revised to require stormwater management
maintenance agreement, Sec. 1 7-41 5, which ensures county access for
periodic inspection/maintenance, and stipulates owner obligation to
maintain SWM facilities. Platted easement is not, however, required.
Platted easement with deed is required for: subdivision developments
[14-428]; site plan developments [1 8-32.7.4.2]; and if a forest -open
space (FOS) area/acreage value is entered as post -developed land cover
in VRRM.xls [DEQ Guidance Memo No. 16-2001 , May 2, 2016]. Chapter
17 alone does not stipulate easement requirements for SWM facilities. Ch.
14 and 18, however, do. This site does not require a site plan and does
not propose subdivision or FOS Easement; therefore, platted easement
and SWM facility deed are not required. A SWM Facility Maintenance
Agreement and surety/bond for SWM facilities are required.
A SWM easement is now shown on plan sheet C5.0. We will begin coordination
with Ana Kilmer for a SWM Facility Maintenance Agreement and surety/bond for
the SWM facilities.
C0.0:
2. Revise title to include VSMP / WPO2020-00007. (Rev. 1) Addressed.
3. Revise Note 2. Shift install detention piping to sequence step 8., or revise
notes to ensure detention system remains off-line until upslope areas are
stabilized. (Rev. 1) NA - Design revised.
4. Source of topography is given as county GIS. Provide source of survey
basis of design (SWM facility / storm pipe design elevations). (Rev. 1)
Addressed.
5. Revise drawing index, C-1 .3 to ref. Site Layout. A VSMP/WPO plan cannot
include/approve a site plan. (Rev. 1) Addressed.
C2.0:
6. Identify and provide ownership data for adjacent parcels (TMP #, Owner
name, deed bk. -pg.). (Rev. 1) Partially Addressed. As follow-up: Provide
large scale image that depicts entire development parcel, with every
adjacent TMP identified (TMP#, owner, deed bk. -pg.). Also: list
intersecting road distance SE / NW.
An Adjacent Property Exhibit has been provided to display the required
information above. See plan sheet C0.1.
7. Recommend coordinate entrance location with VDOT. Acquire VDOT
permits, as needed. (Rev. 1) Persists. Entrance is shown on C3.4.
Comment Acknowledged. VDOT coordination is underway.
8. Label critical slopes. (Rev. 1) Withdrawn. No critical slopes in vicinity of
development (lot/building).
C4.0:
9. Revise sheet title to site layout. (Rev. 1) Addressed.
10. Recommend label typical parking space dimensions. (Rev. 1)
Addressed.
11. Show yard drain outfall (Show connection to SWM system, or
release point). (Rev. 1) NA - Design revised.
12. Provide 50' gas pipeline easement bk.-pg. reference. (Rev. 1)
Addressed.
13. Provide note listing depth (or suspected depth) to gas pipeline.
(Rev. 1) Withdrawn.
14. Provide precautionary Note to contractor concerning grading within
gas pipeline easement. (Rev. 1). Persists - Provide Note on C5.0.
A precautionary note has been added to sheet C2.0 and C5.0.
15. Provide retaining wall details; for example: type, length, Max.
height. (Rev. 1) NA - Design revised. A retaining wall 0 5' high; C4.0,
C5.0) is incorporated into building design to be reviewed as part of
building permit application review / approval process.
Acknowledged.
16. Provide SWIM facility description (material, slope, overall L x W x
DIA x # lines). (Rev. 1) NA - Design Revised.
17. Recommend label post -developed improvements, i.e.: asphalt
parking, concrete walk, etc. (Rev. 1) Addressed.
18. Label two culverts near vineyard entrance. (Rev. 1) NA - Design
revised.
19. Recommend show site water supply (well). (Rev. 1). Addressed.
C-1.3:
20. VaRRm.xls land cover summary post -development lists Final Post
Dev Site Rv — 0.53; revise Energy balance equation to use this post-dev
Rv. (Rev. 1) NA - Design revised.
21. Ensure energy balance equation indicates compliance. (Rev. 1)
Persists. Also, item 50., below.
Stormwater design has been revised to comply with Energy Balance for the
disturbed areas that will be concentrated in the post condition.
22. Provide Q(1) un-detained calculations, since methodology unclear.
14.31 cfs does not match C-1.9 hydrographs. Label un-detained
drainage divide in image. 'Overall drainage areas.' Align graphic,
routings, calculations, energy balance, and compliance narrative with aim
toward simplicity, and clarity. C-1 .3 and C-1 .9 provide a partial,
somewhat confusing analysis of drainage and SWM compliance data. (Rev.
1) Design revised.
23. Revise using I.F. — 0.8. Engineering check, energy balance: Qpost —
(0.8)(14.50)(0.20)/0.53 - Qpost undetained. (Rev. 1) Persists - Although
design revised, this comment is relevant. Water quantity compliance
requires energy balance since proposed discharge is to a natural
conveyance (ref. review item 50., below). Note: Simply altering location of
outfall does not address comment. Given slopes across site, ELS is a non-
viable stand-alone concentrated -to -sheet flow transition device. Runoff
must be detained (reduced) on this site.
Stormwater management for the site has been revised to include detention of
the impervious concentrated areas in the post condition. See sheet C7.0 for
revised flood and channel protection.
24. Provide post -developed impervious cover table, listing impervious
area (sf) of: (Rev. 1) Persists.
a. Drive
b. Walks
c. Parking
d. Buildings
i • Q'-
H. QI�z
III. —Eta
Impervious cover table has been provided under the Water Quality
Calculations on plan sheet C7.0.
25. Show existing structures (structures visible in GIS). (Rev. 1)
Addressed.
26. Label terrain contours; provide elevation labels. (Rev. 1) Addressed.
27. Label roads beyond property boundary. (Rev. 1) Addressed.
28. If nutrient credit purchase proposed, coordinate with Ana Kilmer,
Management Analyst, prior to purchase. (Rev. 1) Persists - Plan proposes
1.59 lb nutrient credit purchase.
Comment Acknowledged. Nutrient Credit purchase will be coordinated with Ana
Kilmer prior to purchase.
C�4 Design Calculations and Narrative, Feb-5, 2021 (Timmons Group)
29. Culvert 4 proposed 27.5% exceeds Max. 16%. Pipe grade steeper
than 16% requires anchors. Ref. VDOT drainage manual, 9.4.8.7,
maximum grades. (Rev. 1) Not addressed. Though design has changed
and culvert 4 does not exist, design proposes pipe 101, 1 9.74%. Provide
anchor block detail, notes, narrative, sequence, etc. to guide installation
of anchors for pipe > 16% slope, per VDOT Drainage Manual standards.
Provide / show anchors, anchor detail, noes, narrative, sequence, etc.,
requisite for pipe 101 installation, for plan approval. Ref. Calc. Report, p.
5. Note: "Slopes in excess of 16% are not preferred because of the need
for anchor blocks. When anchor blocks are used, they should be installed
at every other pipe joint, as a minimum. (See Special Design Drawing No.
A-73 and MA-73 for Anchor Details for Concrete Pipe). Corrugated pipe
may be used on steep slopes in situations similar to those where
shoulder slot inlets are proposed. Corrugated pipe should not be used in
areas where the flow is expected to carry an abrasive bed load or that
have PH and resistivity factors beyond the ranges specified in the
Allowable Pipe Type Table C in Standard PC-1 of the VDOT Road and
Bridge Standards. (See VDOT's Road and Bridge Standard PI-1 for Anchor
Details for Corrugated Pipe). In steeper terrain, large elevation differences
can be accommodated using drop structures, otherwise known as "step
down" manholes, to reduce the pipe gradient .
The storm system has been revised and pipe slopes have been revised to be less
than 16% .
30. Design, show, and label riprap outfall protection for culverts 1 and
5. (Rev. 1) NA - Design Revised.
31. Provide LD-229, storm culvert design tables for all culverts. Avoid
flow velocities in excess of 10 fps. (Rev. 1) Partially addressed. As follow-
up:
a. List pipe 101 outfall V 2-yr.
Comment Noted. Culvert Calcs are now provided
b. Provide outfall protection (OP) sized for outfall flow / velocity.
Outfall protection has now been provided and called out on plans.
c. Label pipe outfall riprap dimensions (L x W x D).
Pipe outfall riprap dimensions are now included on the plan sheet.
32. Provide storm profiles: label INV IN/OUT, rim, etc. (Rev. 1)
Addressed.
33. Label structures. Use VDOT nomenclature. (Rev. 1) Addressed.
34. Provide Nyloplast typical details, as needed. (Rev. 1) Addressed.
35. (C5.0) Provide flow arrows to indicate direction of flow in pipes.
(Rev. 1) Not addressed.
Flow arrows have been provided as requested. See sheet C5.0.
36. If culvert 2 passes beneath proposed retaining wall, show retaining
wall in storm profile. (Rev. 1) NA - Design revised.
37. Provide design details of storm detention system; see comments
elsewhere (slope, DIA, overall length, # lines, etc.). (Rev. 1) NA - Design
revised; detention eliminated.
38. If storm detention is a Mfr. System (ADS, Contech, etc.). provide
manufacturer recommended installation, and periodic maintenance
guidelines (on the plans). (Rev. 1) NA - Design revised.
39. Ensure manways to detention system are accessible. Provide clear
view of 1 5" HDPE end cap and debris cage from above, without requiring
inspectors to enter 4' MH confined space. (Rev. 1) NA - Design revised.
40. Culvert 5: Outfall is shown at elev. 602', while invert out is listed as
600.0'. Revise for consistency. (Rev. 1).
41. Provide swale adequacy calculations (pre -post listed as 3.35 and
3.55 fps, respectively). Provide 10-yr swale capacity (cfs) and 2-yr swale
velocity (fps) calculations. (Rev. 1) NA - Design revised.
42. Provide culvert 3 velocity / capacity calculations; see comments
elsewhere re. LD-229. (Rev. 1) NA - Design revised.
43. Show, design, and label outfall protection, culvert 3. Provide
channel protection, as needed, for drainage formed by proposed and
existing contours downslope of culvert 3. (Rev. 1) NA - Design revised,
but please see ESC Plan, item 14.h., below.
Comment Acknowledged.
44. Recommend steeper slope for culvert 2, flatter slope for culvert 4.
(Rev. 1) NA - Design revised.
C-1.8:
45. Provide additional plan / profile data for detention system: (Rev. 1)
NA - Design revised.
a. Elev. base of bedding,
b. Label hatch to 1 5" pipe,
c. Show debris cage for 2.5" DIA orifice in end cap,
d. Provide additional endcap detail (specify watertight, means of
affixing to 1 5" HDPE, end cap material, etc.),
e. Label culvert 5,
f. Label MH diameter,
g. Label / revise rectangular image in right-hand profile view of
detention structure, which appears inconsistent with plan view.
46. Provide debris cage detail (2.5" DIA orifice). (Rev. 1) NA - Design
revised.
47. Add .PDF image of Construction Record Drawing (As -Built) for
VSMP to the plans. (Rev. 1) Addressed.
48. Submit easement plat. Easement plat must be recorded prior to
VSMP / WPO202000007 approval. (Rev. 1) Review error / withdrawn.
Also, SWM review item 1 ., above.
New:
49. C8.0:
a. Reconcile pipe 101 profile 1 2.00% slope with calc. report, p. S, pipe
101 slope 19.74%.
The storm system has been updated and pipe calcs have been
revised accordingly.
b. Str. 104: Provide label requiring %2" steel plate in floor of MH.
Per VODT Design Standard 9.4.8.7, a steel plate is only required in
a manhole where the inlet pipe and outlet pipe are greater than 4'
apart and the flow is either continuous live flow, carrying abrasive
materials, or the size of the main pipes is 48" or greater. There is
no live flow through this system and therefore a steel plate is not
required for the manhole.
c. Recommend Note requiring 95% compaction beneath pipe 105 /
str. 106, since in fill sections.
Comment Acknowledged. A note has been added to the storm profile
sheet requiring compaction for structures located in fill.
50. 9VAC25-870-66.D./copied from
https://law.lis.virginia.gov/admincode/title9/agencV25/chapter870/secti
on66 D. Increased volumes of sheet flow resulting from pervious or
disconnected impervious areas, or from physical spreading of
concentrated flow through level spreaders, must be identified and
evaluated for potential impacts on -down -gradient properties or
resources. Increased volumes of sheet flow that will cause or contribute
to erosion, sedimentation, or flooding of down gradient properties or
resources shall be diverted to a stormwater management facility or a
stormwater conveyance system that conveys the runoff without causing
down -gradient erosion, sedimentation, or flooding. If all runoff from the
site is sheet flow and the conditions of this subsection are met, no
further water quantity controls are required.:
a. Initial design included detention, a SWWM facility that would limit
runoff without causing down -gradient erosion, sedimentation, or
flooding.
The design has been updated to include detention for the
concentrated runoff from the proposed impervious areas in the
post condition.
b. Please revisit / restore stormwater management facility design to
this VSMP.
The design has been updated to include detention.
c. Revise / delete reference in plan narrative, or calculation report
that water quantity is met by sheet flow, without detention, with an
ELS. Downgradient slope / contours indicate a nearly proximate
existing natural conveyance channel will concentrate increased
volumes of sheet flow.
Acknowledged. Design has been updated.
d. Sheet flow Vol. increases with this project with construction of
significant impervious land cover.
The design has been updated to include detention for the
concentrated runoff from the proposed impervious areas in the
post condition.
e. Divert site runoff to a stormwater management facility or a
stormwater conveyance system that conveys the runoff without
causing downgradient erosion, sedimentation, or flooding.
The design has been updated to include detention for the
concentrated runoff from the proposed impervious areas in the
post condition.
f. Water quantity compliance is not met with this design; please see
images below.
The design has been updated to include detention for the
concentrated runoff from the proposed impervious areas in the
post condition.
51. Engineering urges applicant to coordinate septic field / plan review
with VDH at earliest convenience:
Comment Acknowledged
D. Erosion and Sediment Control Plan (ESCP).
Virginia Code 62.1-44.1 5:55 requires the VESCP authority to approve or disapprove an
ESCP. This plan is disapproved for reasons listed, below. The erosion control plan
content requirements can be found in County Code section 1 7-402..
C-1 .5:
1. It is not apparent how proposed building4, [and] parking, and SWN!
din can be built while maintaining cleaR wateF diversions. Ensure
diversions and all ESC can be maintained, as proposed, throughout
construction. Shown ed 1 n s ble ;nte ,l access betWeeR SR 664
and ^ n5tFUc•ien site (Rev. 1) Persists.
Notes have been added to Erosion and Sediment Control Phase 2 to
better convey to the contractor and planner the construction sequence
that shall occur in order to maintain acceptable Erosion and Sediment
Control measures until site stabilization is completed.
2. Label OP1 , OP2. (Rev. 1) NA - Design Revised.
3. Recommend initial location for staging and parking, solid waste
dumpster, port-a-john, and concrete washout that does not require
relocation for installation of detention system, or culvert 5. (Rev. 1)
Addressed.
4. Concrete wash -out station must drain to a trapping device; show location
of trapping device. (Rev. 1) Not addressed.
A wash -out trapping device has been added to the Pollution Prevention
Plan and called out accordingly.
5. Provide design details for level spreader (ELS) at outfall of culvert 3. Ref.
VA DEQ Stormwater Design Specification No. 2, Table 2.2 for ELS design
criteria (1 3 lin. Ft. per each 1 cfs of inflow). (Rev. 1) May persist. An ELS
may transition concentrated release from a detention system / SWM
facility to sheet flow. Provide design details for any ELS that persists as a
design feature.
The design has been updated to include detention for the concentrated
runoff from the proposed impervious areas in the post condition. Energy
balance is being met for the concentrated stormwater outfall and the ELS
has been removed.
6. Include ELS, culvert 3, in SWM narrative. (Rev. 1)NA - Design Revised.
7. Label all culverts on this plan sheet. (Rev. 1) Addressed.
8. Revise CE symbol at site entrance to PCE (paved entrance). (Rev. 1) Not
addressed.
CE symbol has been revised accordingly
9. Provide additional existing contour labels, to aid review and analysis.
(Rev. 1)Add ressed.
10. Show / label sanitary line (crossing) in culvert 5 profile (proposed
san. Line from building to septic field). (Rev. 1) Not addressed. Show /
label sanitary line (crossing) in pipe 103 profile, C8.0 (FM crossing x 2).
The stormwater system has been revised and no longer crosses the
proposed sanitary.
C-1 .7:
111. Provide specific OP details (OP1 , OP2), (Rev. 1) NA - Designed
revised.
12. Provide standard VDOT details: (Rev. 1) Persists.
a. PB-1 (pipe bedding)
b. ST-1 (safety steps)
c. IS-1 (inlet shaping)
Details have been added to plan sheet C1.0
New:
13. C3.1 : Provide paved wash rack detail; p.8, ACDMS - link:
A paved wash rack detail has been added to plan sheet C3.1.
14. Provide ESC phase interim to phase 1 (C3.2) and 2 (C3.3) that
shows phase 2 final site grading with phase 1 sediment traps:
a. Phase 1 sediment traps (ST1 , ST2) control runoff from 3.82 Ac.
Phase 1 ESC diversions have been designed to allow the phase 1
drainage areas to closely match the phase 2 drainage areas and
notes have been added to maintain the similar drainage divide and
areas to each trap through construction.
b. Phase 1 indicates trap placement, diversions, but apart from ST
grading, no grading, whatsoever.
Correct. The existing site allows, and phase 1 diversion dikes allow
for the site to drain to the proposed sediment traps without the
need for additional site grading.
c. Phase 2 indicates final, built condition, but no sediment traps.
Sediment trap outlines and notes have been added to Phase 2 to
better convey that all E&S measures must remain in place until the
site is fully stabilized as also required by the sequence of
installation narrative on sheet C3.0.
d. The interim phase, where all site work / grading and building
construction occur while STs receive diverted runoff during
constructive phase, are not shown.
Drainage divided and notes have been added to Phase 2 to ensure
E&S measures are required and must remain until site is fully
stabilized.
e. No ESC information is provided for the entirety of site grading /
building construction.
Phase 2 has been revised to show and note E&S measures that
must remain until the contributing drainage areas are stabilized.
f. Phase 2presents sparse perimeter controls unequal to challenge of
controlling runoff from 3.82 Ac. DA, once diverted to sediment
traps, now released to newly graded fill slopes.
Notes have been added to phase 2 to ensure that diversions and
sediment traps remain in place until site is stabilized. Parking
layout and storm have also been revised which will decrease flow
from impervious areas to newly graded fill slopes.
g. Final grading proposes uniform contours that in theory support
sheet runoff, once stabilized.
Comment acknowledged.
h. Stabilization may not occur for weeks, or months. Until site is
stabilized, sediment traps must operate with relocated diversions
routing runoff from graded slopes to same / similar traps, with
diversions designed to convey runoff to the traps. Also, please
consider temporary slope drain/s.
Per the E&S narrative on sheet C3.0, all E&S measures are to remain
in place until site has been fully stabilized and signed off on by the
E&S inspector. Notes have been added to phase 2 ESC plan to
reiterate this. Divisions are located such that they can remain in
place through final grading. A curb and gutter have been added
along the top of the slope from the parking and a note about
temporary division to a proposed inlet has been added to limit flow
down slope.
i. In ESC phase 2, no ESC or channel design is provided for
concentrated runoff at intersection of existing grade and proposed
grade at NW side of site. The total vertical fall on the NW side of the
site is 40' (658' - 618'). Design permanent storm conveyance
channel (may be grass -lined if velocity non -erosive / provide EC-2,
EC-3 matting, as needed) where runoff concentrates. Evaluate
channel velocity, and armoring (EC-2, EC-3), as needed (blue arrow
below).
Slope edge has been regraded to have a gradual tie into existing
grade and avoid concentrated flow as much as possible. A channel
calculation has been run and it is determined that the velocities are
non -erosive in the final condition. See sheet C6.0 for calculation
and channel cross-section.
j. Please consider permanent surface water diversion to collect /
divert runoff from edge of parking lot to base of slope, rather than
across slope face. Design assumes slope stability, even if parking
lot runoff releases across 1 5' -20' H fill slope. Sheet runoff from
impervious areas across newly constructed fill slopes of this height
will likely cause rill erosion, which may worsen, or prove difficult or
expensive to fix, once rills established. This is a recommendation.
Also, see 18-4.3.3.C.4.
Curb has been added to the parking areas to reduce runoff from
pavement to the slopes.
k. C3.3: Perimeter controls for expanse of 1 5-20' high fill slopes are
inadequate, or simply not provided. Provide adequate phase 2
perimeter controls; see image, below:
A temporary diversion dike is provided in phase 1 and shall remain
in place until the entire site is stabilized and approved by the US
inspector.
15. C3.2:
a. Label ST floor dimensions in plan view (L x W).
Dimensions have been added to the Sediment Traps as requested.
b. Label ST stone weir dimensions, plan view (L x W).
Stone Weir dimensions have been added to the plans as requested.
We have included PDF copies of the plans and calculations for your review. If
you have any questions or comments, please feel free to give me a call at
434.295.5624 or email at jonathan.showalter@timmons.com .
Sincerely,
Jonathan Showalter, PE
Project Manager