HomeMy WebLinkAboutWPO202000042 Review Comments WPO VSMP 2020-09-30Phone (4341296-5832
Project:
Project file#:
Plan preparer
Owner or rep.:
Plan received date:
Date of comments:
Reviewer:
Cil
1T
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Fax(4341972-4126
VSMP Permit Plan Review
2435 Gobblers Ridge Pond "PSC-P VSMP
WPO202000042
Jim Taggart, PE, Roudabush, Gale & Associates, Inc.
Physical: 999 Second St. SE, Charlottesville, VA 22902
Mailing: 435 Merchant Square, Suite 300-159, Charlottesville, VA 22902
JTagggq@roudabush.com loday@aroudabush.com
Calvin W. Dabney / Sandra D. Dabney
2435 Gobblers Ridge, Charlottesville, VA 22902 [ dabnevcw(a),,aol.com ]
9 Sep 2020
30 Sep 2020
John Anderson
County Code section 17-410 and Virginia Code §62.1-44.15:34 requires the VSMP authority to act on any
VSMP permit by issuing a project approval or denial. This project is denied for reasons listed below. The
VSMP application content requirements can be found in County Code section 17-401.
A. Stormwater Pollution Prevention Plan (SWPPP)
The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain
(1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary.
1. Submit 2019 VPDES Permit Registration, Sec. 1, SWPPP. Link below.
2. Revise SWPPP (12-section county template). Note: LOD =1.43 Ac. Link below.
a. Revise SWPPP title pg: Identify project, preparer, date, include ref. to plan title (2435 Gobblers
Ridge Pond), and WPO202000042.
b. Revise SWPPP Sec. 1, 2, 3 of SWPPP. Project is not exempt. Please call if any questions.
c. Provide update to Sec. 4 of SWPPP, once all ESC Plan comments addressed.
d. Provide Sec. 5, SWM Plan.
e. Sec. 6.A.: Provide I I" x 17" PPP Exhibit.
f. Sec. 6.E. — provide complete contact information. Only a name is listed. Provide address, tele.,
email, etc. (Note: Sec. 8 lists tel. # ; if this is tele.# of C. W. Dabney, list this tel.# at 6.E.)
g. Sec. 9 /SIGNED CERTIFICATION: Sign certification.
h. Sec. 11: Include 2019 VPDES CGP in SWPPP, since CGP applicable.
B. Pollution Prevention Plan (PPP) — Also, item 2.e. above.
The PPP content requirements can be found in County Code section 17-404.
3. Provide I I" x 17" PPP Exhibit to include:
a. Rain gauge.
b. On -site fuel storage for construction grading equipment, if proposed (defer to design judgement).
If shown, provide secondary (berm) containment with impermeable liner with volume sufficient to
accommodate volume of stored fuel + 10-yr. storm event (vol.) x 1.1.
c. Stone construction entrance.
d. Ex. pond dewatering device.
e. Porta John.
C. Stormwater Management Plan (SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This
Engineering Review Comments
Page 2 of 5
plan is disapproved for reasons listed below. The stormwater management plan content requirements can be
found in County Code section 17-403.
1. Project does not qualify for any VSMP exemption listed at Sec. 17-303, A.-H., and is subject to the VSMP
(Sec. 17-302.A.). This item discussed with and confirmed by County Engineer.
2. Revise sheet 1 plan title to read VSMP plan for 2435 Gobblers Ridge Pond. Include reference to
3. Submit VSMP Application with appropriate fee. The fee for small construction activity or land clearing
that is equal to or greater than 1 acre and less than 5 acres is $2,700 (17-208). Note: this land -disturbance
occurs on a single-family parcel, but land disturbance does not involve construction of a sole single-family
detached dwelling. Project is ineligible for Agreement in lieu of a SWM Plan.
4. $300 received for VESCP may be applied to the VSMP permit fee.
5. Since half the $2,700 fee is due with initial application, balance pending is $1,035. Engineering will notify
Intake staff of this circumstance.
6. This project requires and will receive a 2019 CGP.
7. Provide required VSMP stormwater quantity and quality compliance calculations. Submit VaRRM.x1S.
8. Note: Engineering has considered stormwater quality (sample VaRRM.xls, Attached) and quantity.
a. SWM water quantity control should be relatively straight -forward: post -developed sheet flow
that meets 9VAC25-870-66.D. Engineering accepts this provided plan demonstrates rill
erosion unlikely. Also, ESCP review item #7, below.
b. SWM water quality phosphorus reduction requirement is -0.09 lb. ( $0) if use re -development
worksheet (D soils accurate for site), and 0.2 Ac. impervious ( pre -developed; pond surface);
that is, no SWM facility or water quality compliance measures required. Engineering accepts
this.
c. Recommend include USDA Websoil survey data with plan re -submittal (data attached).
D. Erosion and Sediment Control Plan (ESCP)
Virginia Code §62.1-44.15:55 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 17-402.
Sheet 3
1. Sediment Trap
a. ST Calculation table provides dimensions, which is helpful. Please also include ST floor
dimension in plan view.
b. Revise contours at ST weir, consistent with ST Cale. table.
c. Provide dimension label for weir (L x W) and riprap downslope of weir (L x W x D).
2. Provide TSD (VESCH 3.15, to be abandoned once grading complete) to convey slope runoff since
proposed grading eliminates existing permanent drainage channel. During construction, concentrated
runoff conveyance, top to toe of slope, is required. This may outlet at the temporary ST and be covered in
place with final stage of construction if inlet at top of slope is permanently closed. Albemarle is not
directing design, but requests design consider and accommodate loss of existing permanent drainage
feature that presently feeds the pond. Post -construction design proposes sheet runoff. It is grading phase
operations that require temporary conveyance of storm runoff across and down the site, else periodic storm
runoff may erode newly graded slopes.
3. Sheet 3, or 4: Provide topsoil note describing design intent (topsoil limits, depth) such that final graded
slopes support permanent vegetation. Import does not need to be entirely topsoil, but suitable fill. Final
graded slopes require topsoil to support permanent vegetation, and limit potential for downslope off -site
impacts.
4. If pond floor sediment or sediment trap floor sediment is to be wasted on -site, discuss and show areas this
saturated material will be wasted, or where and how it will be placed (on native, poor hydric, D soils) to
drain sufficiently to support overlying layers of soil, without failure.
Engineering Review Comments
Page 3 of 5
r.M
os
N/F FULLER
Sheet 4
5. Show proposed contours 384' 388'.
iY. 93-I50
N/F NLLEN,SYVWNIE NICOLE
lb
• '�
OW
N/F DA
If '%
f
TM 93-33L
U82708/585
N/F BEDARF, OEREN EUIIN
OR MINE iAiE BEWF
6. Display graphically outlet for water pumped from pond.
a. Evaluate natural channel to receive pond pump water.
b. Ensure volume and velocity of water thru natural receiving channel will not cause damage or
exceed drainage capacity or contribute to downstream erosion or flooding. Note: Nearly
immediately, pond pump water will discharge to neighboring property.
c. Provide downstream and off -site ESC measures, as needed, to ensure even short duration effects
of pumping cause no downstream /off -site erosion.
d. Show temporary ESC measures, as needed, in conjunction with a, b, c, above.
Engineering Review Comments
Page 4 of 5
e. Provide detail for dirt bag, or similar pond pump -water filtering device.
f. Provide detail for dewatering measure, or measures.
g. Silt -laden pond pump -water may not be discharged directly to natural receiving stream or drainage
feature. Provide narrative and propose measures to aid review, and compliance during
construction phase, especially compliance with ESC Min. Std. 19, listed on sheet 5.
7. Evaluate post -development design storm runoff event. Ensure runoff from proposed grading is sheet runoff
that will not likely cause or develop rill erosion.
8. Identify off -site borrow area, if borrow area known.
9. Provide ESC plan for off -site borrow area, if required.
10. Sheet 5: Provide brief narrative project description. Identify borrow location. Recommend estimate
volume of import required.
Links:
d. VSMP Application: httos://www.albemarle.orwhome/showdocument?id=170
e. SWPPP: httos://www.albemarle.orwhome/showdocument?id=166
f 2019 VPDES CGP (include at SWPPP, Sec. 11):
https://www.deg.virginia. gov/Portals/0/DEQ/ Water/stormwaterManagement/CGP%20ADA/CGP
2019. pdVver-2019-05-06-131630-407
g. 2019 VPDES Registration Statement (include at SWPPP, Sec. 1):
https://www.deg.virginia. aov/Portals/0/DEQ/Water/stormwaterManagement/CGP%20ADA/CGP
%20Registration%20Statement%2O2019 FINAL_201904.pdflver-2019-05-01-163955-110
Note: this project will be registered with DEQ.
The VSMP permit application and all plans may be digitally resubmitted for approval when all comments have been
satisfactorily addressed. Please provide digital version of revised plan /SWPPP with a completed application form.
Process:
After approval, plans will need to be bonded. The bonding process is begun by submitting a bond estimate request
form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and
check parcel and easement information based on the approved plans. The County's Management Analyst will
prepare bond agreement forms, which will need to be completed by the owner and submitted along with cash,
certificates or sureties for the amounts specified. The agreements will need to be approved and signed by the County
Attorney and County Engineer. This may take 24 weeks to obtain all the correct signatures and forms.
After bonding is complete, county staff will need to enter project information in a DEQ database for state
application processing. DEQ will review the application information based on local VSMP authority approval. At
this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest processing,
this is done electronically with the emails provided on the application (SWPPP Registration Statement). DEQ
should notify applicants with instructions on how to pay fees. When DEQ approves the application, they will issue a
permit coverage letter. This should be copied to the county.
After DEQ coverage is issued, the County can hold a pre -construction conference. Applicants must request a pre -
construction conference (complete form) and pay any remaining application fee. The form identifies the contractor
and responsible land disturber, and fee remaining to be paid. This will be checked by county staff, and upon
approval, a pre -construction conference will be scheduled with the County inspector. At the pre -construction
conference, should everything proceed satisfactorily, a grading permit will be issued by the County so that work
may begin.
County forms can be found on the county website under engineering applications at:
httos://www.albemarle.ore/govemment/community-development/ap ply-for/en ing eering-al2olications
Please Note: Albemarle County website was redesigned/relaunched 8/102020.
Engineering Review Comments
Page 5 of 5
Certain links may not work —please let us know of any issues with the website.
Please feel free to call if any questions. I may be reached at 434.296-5832 -x3069
Thank you.
W1`0202000042 2435 Gobblers Ridae Pond VSMP 093020