HomeMy WebLinkAboutWPO202000024 Review Comments WPO VSMP 2020-06-17COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126
VSMP Permit Plan Review
Project:
Christopher -Shilling Residence - VSMP
Project file#:
WP0202000024
Plan preparer:
Alan Franklin PE, Waterstreet Studio / 418 E. Main St.
Charlottesville, VA A22902
[alanAalanfranklinpe.com ]
Owner or rep.:
Sally Christopher & Tanner Shilling / 817 Montrose Ave
Charlottesville, VA 22902 [tanllyshillopherAgmail.com ]
Plan received date:
20 Apr 2020
(Rev. 1)
10 Jun 2020
Date of comments:
24 May 2020
(Rev. 1)
17 Jun 2020
Reviewer:
John Anderson
In speaking with Cailen von Briesen, 5/21/20, Engineering expressed commitment to review revised plans within 5
business days (Rev 1: intend to review/comment within 3 - S business days ofplan resubmittal). " bit mefe tim
easement.
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 trace 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. Complete Certification, p. 7, single family SWPPP. (Rev. 1) Persists. Applicant (6/9/20 letter): `Given the
current work environment, I could not easily obtain owner /operator signatures on the appropriate pages of
the revised SWPPPP booklet for this submittal. He will need to sign at the pre -construction meeting.' As
follow-up: While Engineering recognizes the difficulty due to pandemic, Certification is needed for plan
approval. Plan approval is required prior to pre -construction. A .PDF scan of certification signatures
(SWPPP cover and Sec. 8) is sufficient. Sec. 8 Inspector Name may be TBD until pre -construction request.
With pre -construction request form, Applicant must notify county of a named individual who will perform
SWPPP inspections. Certification signatures attest to authenticity and accuracy of the SWPPP, and since
SWPPP cover lists Construction Activity Operator as Tanner Shilling, this signature is requested /required.
Please provide certification signatures at earliest convenience.
2. Given scale of project, provide PPP Exhibit that shows: paved CE draining to trapping measure, rain gauge,
solvent storage, stucco /paint clean-up area, concrete washout draining to trapping measure, on -site fueling
with lined containment /berm sized for (stored volume of fuel + 10-yr rain event) x 1.1 (cf), non -hazardous
solid waste dumpster, and portable sanitary facility. (Rev. 1) Partially addressed. As follow-up: Provide
tentative (initial) location for rain gauge. Please confirm on -site fuel storage is not anticipated at this time.
Revise pollution prevention area to also list solvent storage, stucco /paint clean-up areas, if this is a suitable
location. Solvent storage /clean-up areas are assumed with proposed construction.
3. Include reference to WP02020-00024 in revised single-family SWPPP title. (Rev. 1) Addressed.
Engineering Review Comments
Page 2 of 4
B. Pollution Prevention Plan (PPP) — See item 2 above. (Rev. 1) Persists. As follow-up: Slight revision
/confirmation requested.
The PPP content requirements can be found in County Code section 17-404.
C. Stormwater Management Plan (SWMP) — If text grayscale, comment addressed with Rev. 1.
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This
plan is disapproved for minor reasons listed below (request for labels). The stormwater management plan
content requirements can be found in County Code section 17-403.
SW.100
a. If (nutrient) credits are not available and a portion of the parcel is placed in forest /open space
easement, easement deed and Maintenance Agreement must be recorded prior to VSMP plan
approval. (Rev. 1) Addressed. Applicant has provided a letter of nutrient credit availability
(Rivanna River Nutrient Bank) d. June 1, 2020.
b. Design proposes concentrated (piped) discharge to each ELS; provide:
i. V2-yr calculations (Rev. 1) Addressed. Also, item l.b.ii., below.
Note: each LS sizing worksheet assumes 5 fps within pipes. This may be erosive.
ii. Outlet protection, each ELS (1 — 4). Specify L X W X D outfall protection. Specify size
(Cl. 1 riprap, etc.). Ensure velocities non -erosive at each ELS. (Rev. 1) Partially
addressed. Applicant response: `The Q10 flow for each of these pipe outlets is below the
minimum value on Plate 3.18.3 so it was filled out and added to the plan sheets once to
apply to all outlet protection. Outlet protection size labels adjusted accordingly.' As
follow-up: Size label was added to LS#2. Please add outlet protection size labels to
LS#1, LS#3, LS#4, EC.103.
iii. Specify VDOT end sections for each outfall pipe. (Rev. 1) Partially addressed.
Applicant: `VDOT end sections were added for each outfall pipe...' Asfollow-up: Add
VDOT end section label to LS#1, EC.103. (SW.102 profile indicates VDOT ES-1)
iv. Provide profile for each outfall pipe.
v. Ensure sufficient cover.
vi. Check for conflicts.
c. Outfalls to LS
i. Label pipes: 1, 2, 3, 4 (or similar).
ii. Provide pipe L, DIA ( similar to EC.102).
d. Label residence, pool, pool house, garage, barn, parking, drive, etc.
e. Recommend either permanent inlet protection, culvert B, or provide plan notes that emphasize
need to maintain inlet protection at culvert B until barn drive ditch is completely stabilized.
f. Provide V2-yr barn drive ditch which conveys runoff from Zack Lane, over a 20' vertical interval.
Provide soil stabilization blanket /similar, if needed.
g. Notel : Nutrient purchase requires coordination with county (Ana Kilmer /tel. 434.296-5832 -
x3246) prior to executing purchase documents since project specific information must appear in
documents (Affidavit, bill of sale).
h. Note2: Nutrient purchase must be completed prior to receiving a grading permit. In speaking with
Cailen von Briesen, 5/21/20, speed is an objective, with project approval /grading permit as soon
as possible. Either SWM water quality compliance strategy involves process: either purchase of
nutrient credits or platting /recording Forest/Open Space Easement. Engineering supports either
approach, consistent with program requirements. It is not too soon to initiate either process, either
by exploring nutrient credit availability, and contacting Ana Kilmer, or committing to plat an area
as Forest /Open Space Easement. An easement requires separate county application, fee, and
review schedule that will add considerable time to grading permit issuance, likely, several months.
Nutrient purchase may be a quicker path to grading permit issuance.
Include Construction Record Drawings (As -built) for VSMP on the plans; link:
http://www.albemarle.or2/upload/imaizes/forms_center/departments/Communi1y Development/forms/En ing eering and
WPO Forms/WPO VSMP Construction Record Drawings Policy _23Ma,, 2�pdf
Engineering Review Comments
Page 3 of 4
3. Include ELS periodic maintenance and inspection guidelines on the plans (see VA DEQ Spec. #2).
4. Include ELS construction installation guidelines on the plans (VA DEQ Spec. #2).
Note: Although ELS are not installed for water quality, they are installed for quantity control, are SWM
facilities, and installation, maintenance and inspection procedures are relevant and must appear on the
plans.
5. 17-414 requires bond for ESC measures.
6. Engineering policy concerning single-family construction has evolved, and Albemarle does not now require
SWM Plan bond for single-family residential SWM facilities, although mitigation plans and ESC measures
do require bond. Although SWM facilities (ELSs) will not be bonded, ESC plan bond may not be released
until ELSs are accepted. See item 2, above. An as -built drawing is required for each ELS. (Rev. 1)
Comment revised. An As -built drawing is not required for each LS; rather, PE -Certification letter that
each LS is installed per design is required (LS #1 - #4).
7. A state permit is not required for single-family construction. (VAR10 CGP).
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 approved.
1. Sign /seal plans.
2. Include reference to WPO2020-00024 in plan title.
3. Depict existing conditions; provide existing conditions sheet.
4. Provide Stage 0 ESC Plan (1" =40' scale) that shows perimeter controls prior to clearing, or constructing
improvements, consistent with construction sequence.
May combine 3 and 4; i.e., existing conditions w/perimeter ESC controls /paved construction entrance
(PCE).
5. On Stage 00 ESC Plan:
a. Show property boundary and label TMP #59-37D (Also, note, below).
b. Provide ownership data for TMP#59-37D.
Note: SW.100 indicates boundary line adjustment (BLA) will combine TMP 59-37C4 and -37D.
BLA plat must be recorded prior to VSMP /WPO plan approval unless existing TMP 59-37D
boundaries are shown. Also, timing of BLA may affect nutrient purchase or format of Forest
/Open Space Easement. Please provide status on BLA application (submitted, reviewed, etc.).
c. Show and label critical slopes. Use easily distinguishable hatching.
d. Show /label ponds (image) [Image removed with Rev. 1 comments].
e. Stage 0 will not show proposed improvements. Once existing conditions, distances, slopes to SF
perimeters are more nearly visible, Engineering anticipates one or more sediment traps will be
needed. This 4.30 Ac. disturbance likely cannot be managed without diversions and sediment
traps.
f. If traps are required, provide required ST design data, including trap floor /weir dimensions, etc.
6. EC.101
a. Revise steep slopes label to critical slopes, since project is in the rural area.
b. LS labels reading L.P. ELEV 531.5', for example, are unclear. Please clarify L.P.
c. Provide roof /garage /barn leader line connections to piped systems. If roof discharge is to
surface, label discharge to splash blocks. Consider erosion potential. Engineering recommends
roof runoff collection with conveyance to piped systems. (Rev. 1) Addressed. Applicant: `6" roof
leader added to the eastern end of the barn to convey roof drainage LS# 1.'
(Evaluate /consider critical slopes susceptibility to erosion.)
d. Label temporary outlet protection dimensions at SE corner of lawn (L x W x D).
e. Revise LS3 discharge pipe to 8" DIA.
7. EC.103 /Level spreader -Typ. detail
a. Include schematic representation of the ELS structure, concrete or timber.
b. Provide x-sectional dimensions (L of each of 4 ELSs varies).
Engineering Review Comments
Page 4 of 4
c. See "�aLQSter-xnwatefDesign Speeif4eatio� �`T�.o-'�z3, below. [Fig. removed with Rev
comments.]
d. Include underdrain in EC.103 detail to prevent ponding /nuisance conditions; ref. Fig 2.3.
e. Daylight ELS underdrain/s.
(Although EC.103 detail is descriptive, it lacks structural element and underdrain.
Recommend label EC.103 L.S. detail ( x 4)).
The VSMP permit application and all plans may be 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 have 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 have to be completed by the owner and submitted along with cash,
certificates or sureties for the amounts specified. The agreements will have to be approved and signed by the County
Attorney and County Engineer. This may take 2-4 weeks to obtain all the correct signatures and forms.
A Stormwater Management Facilities Maintenance Agreement will also have to be completed and recorded. The
County's Management Analyst or other staff will prepare the forms and check for ownership and signature
information. The completed forms will have to be submitted along with court recording fees.
If nutrient credit purchase is required, purchase documents must be executed prior to county issuance of a
grading permit.
Note: If forest /open space easement is required, plat /deed approval and recordation, which entail separate
processes, must be complete prior to plan approval.
If a boundary line adjustment is pending then BLA approval processes, including plat review and
recordation, must be complete prior to plan approval, or existing parcel boundaries must be shown on the
plan, consistent with current real estate records. (Rev. 1) Note: existing parcel boundaries are shown.
After Maintenance Agreement, forest /open space easement /BLA plat (as needed) are is recorded, nutrient credits
purchased (as needed), and ESC Plan bond posted, Albemarle can hold a pre -construction conference. Applicants
must request a pre -construction conference (by completing 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 forms center under engineering;
httD://www.albemarle.oriz/deDtforms.aSD?deDartment=cdenLrwDo
Please feel free to call if any questions. 434.296-5832 -0069.
Thank you.
WP0202000024_Christopher-Shilling resid_061720revl