HomeMy WebLinkAboutWPO201800049 Review Comments WPO VSMP 2019-01-14COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126
Project:
Plan preparer:
Owner or rep.:
Plan received date:
(Rev. 1)
(Rev. 2)
Date of comments:
(Rev. 1)
(Rev. 2)
Reviewer:
WP0201800049
VSMP Permit Plan review
Oak Hill Convenience Store — VSMP
Justin Shimp, Shimp Engineering, 912 E. High Street
Charlottesville, VA 22902 fiustin(&shimp-engineering.com]
SIDDH LLC, 1096 Foxvale Lane, Charlottesville, VA 22902-8255
20 June 2018
22 Oct 2018
12 Dec 2018
28 Jul 2018
7 Nov 2018
14 Jan 2019 — Approved pending nutrient credit purchase (0.32 lb./yr.)
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 eligible for approval pending
purchase of 0.32 lb./yr. phosphorus nutrient credits. Prior review comments are addressed.
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. Link to County template:
http://www.albemarle.orgLupload/images/forms_center/departments/Community Development/forms/En ing eeringtand
_WP O_Forms/Stormwater_Pollution_ Prevention_Plan _S WPPP_template.pdf
1. Sec. 1, Registration Statement —Required if subject to VSMP (17-401.C.); this project is subject to the
VSMP. (Rev. 1) Addressed.
2. Sec. 3, Nature of Activity Retaining wall may not be installed prior to installation, review and approval of
all ESC measures. Revise order of Phase 1 sequence of construction; this comment appears elsewhere.
(Rev. 1) Addressed.
3. Sec. 4 /5 (ESC /SWM Plans) — Update with revised plan sheets. Note: include SWM Plan, requested below
(item #5). (Rev. 1) Pending. Applicant response: `This will be completed prior to final approval.' (Rev. 2)
Addressed.
4. Sec. 6, SWPPP Exhibit —Show location of PPP measures by placing legend symbols on Exhibit. (Rev. 1)
Not addressed. Show initial locations of typical PPP measures (solid waste dumpster, portable sanitary,
fuel /chemical storage w/ double -wall and/or berm containment, concrete washout, wash areas) on Exhibit.
No SWPPP is approved without locations of PPP measures identified on the exhibit. The contractor may
revise locations of measures. Engineering discourages the view that symbols may not be shown, since a
S«Mnp —hibit is the single most -reviewed section of a SWPPP during a DEQ oversight inspection. (Rev.
2) Addressed.
5. Sec. 8, Qualified Personnel —Provide. Recommend PE -staff* until GC selected and VPDES authority is
delegated (SWPPP, Sec. 10). (Rev. 1) Addressed.
6. Sec. 9, Signed Certification — sign /date, as SWPPP preparer. (Rev. 1) Pending. Please see email sent
11/6/2018 4:15 PM. (Rev. 2) Addressed.
7. Sec. 12, Inspection Log (form) Provide blank for inspector to print name; signatures are often illegible.
Engineering Review Comments
Page 2 of 5
* Recommend Shimp Engineering contact reviewer to schedule day /time to update SWPPP at COB; SWPPPP may be
left for pickup at CDD front desk. (Rev. 1) Addressed.
SWM Plan
1. General: Include the nine (9) general construction notes and three (3) general construction notes for
stormwater management plans on the VSMP Plan; ref. pg. 1 and 4./.PDF —use link:
http://www.albemarle.org/upload/images/forms_center/departments/Community Development/forms/Engineeringtand
_WPO_Forms/Engineering_Plan_Review_ General_ Notes_Feb20l4.pdf (Rev. 1) Addressed.
2. C2: Review and revise Phase 1 sequence; retaining wall may not be installed prior to ESC measures. Also,
SWPPP item #2, above. Review and revise sequence of construction phase 1 numbering. (Rev. 1)
Addressed.
3. C2: Revise project description to include construction and installation of underground petroleum storage,
and above -ground commercial /retail gasoline dispensing kiosks. (Rev. 1) Not addressed, possible
oversight. Please revise project description, sheet C2, as requested. (Rev. 2) Partially addressed. No
follow-up required.
4. General: Development proposes stormwater discharge release 55' from a well that is source of drinking
water for county residents. Albemarle requests well testing with independent state -certified laboratory
analysis for the following petroleum constituents: benzene, toluene, ethylbenzene, total xylenes,
naphthalene, and MTBE to establish baseline values. (Ref. Virginia Department of Health guidance for
private well water testing where circumstance specific to property indicates elevated cause for concern.)
Please also ref. 21-Jun 2018, Initial Site Plan Engineering review comment #18.d. Note that 6/21/18 review
comment (18.d.) made specific detailed design request, as condition of VSMP approval. Revise
accordingly. Engineering accepts that 6/21 comment came after 6/20 submittal of the VSMP plan. This
development poses more than insignificant potential adverse impact to groundwater quality, and Albemarle
would be remiss not to establish baseline levels for petroleum constituents which may or may not be present
within the existing well. Spills of petroleum product will occur, will route via storm collection and pass
untreated through a detention system, to be released approximately 55' from an existing residential well.
This distance must increase to at least 100'. Again, petroleum product handling and dispensing pose
intrinsic risk to an existing well water supply for county residents. (Rev. 1) Addressed. Analytics Corp
petroleum constituent well -test results d. 10/24/18 (sent via email 11/l/2018 4:09 PM) are available in CV.
Link to VDH Private Well Water Testing Guidance: http://www.vdh.virginia.gov/environmental-health/onsite-sewage-
water-services-updated/organizations/private-well-water-information/guidance-on-testingyour-private-well-water/
Provide separate SWM plan sheet
SWM Plan sheet:
a. Transfer Detention Pipe A and Pipe B profiles and detention outlet control structure to SWM Plan
sheet.
b. Provide details for 4.7' high weir wall sufficient to guide manufacture and construction
installation; consider: (Rev. 1) Addressed.
i. Galvanic protection
ii. Material
iii. Gauge
c. Provide level of design detail required to prepare an As -built Construction Record Drawing. (Rev.
1) Addressed.
d. Place Construction Record Drawing (As -built) for VSMP* on SWM Plan sheet. (Rev. 1)
Addressed.
e. Provide bedding detail /specifications for detention system. (Rev. 1) Addressed.
f. Provide backfill detail /specifications for detention system. (Rev. 1) Addressed.
g. Provide recommended installation guidelines, if a manufactured system. (Rev. 1) Addressed.
Engineering Review Comments
Page 3 of 5
h. Provide construction installation, and construction inspection notes on the plans. (Rev. 1)
Partially addressed. Asfollow-up: Provide ADS standard detail STD-201 and Technical Note
5.04 HDPE Connections to Manholes and Structures, since ADS STD-204B Note states
`Performance is Highly Dependent on Installation' and provides ref. to relevant installation
recommendations. (Rev. 2) Addressed.
i. Provide manufacturer recommended periodic inspection guidelines and frequency, on the plans.
(Rev. 1) Partially addressed. Asfollow-up: Expand Stormwater Maintenance Note (sheet C1) to
include this or similar text: "Any correction of deficiencies or deviations from design or approved
As -built conditions are to be coordinated with a licensed professional engineer or an authorized
manufacturer's representative and addressed within thirty (30) days of discovery of deficiency.
Owner is requested to notify Albemarle County as soon as possible with detailed description of
issue and proposed remedy for any issue required to be addressed other than removal of debris, or
sediment. Proposed Stormwater Maintenance Note, Cl, stipulates removal of debris on a biannual
basis. No other periodic maintenance guidelines are proposed, when issues with weir or orifice, or
deflection, seals, etc. may affect performance. Revise note to include requested text, above. Also,
include ADS recommended maintenance procedures on plans; link: htips://www.ads-
pipe.com/sites/default/files/Maintenance_Detention_ Infiltration_ System _HDPE_%28Tech Note_
A6.01_02-07%29.pdf. Engineering will compare Stormwater Maintenance Note, Cl, with ADS
document. (Rev. 2) Addressed.
j. Provide and label all access ways to the underground system. (Rev. 1) Addressed.
k. Ensure access is possible to all portions of the underground system. (Rev. 1) Addressed.
1. Provide installation notes for weir plate; if MH-weir plate is fabricated prior to delivery, state this.
(Rev. 1) Addressed.
m. Provide orifice debris cage. (Rev. 1) Addressed.
n. Ensure orifice debris cage is accessible for periodic maintenance. (Rev. 1) Addressed.
o. Label width of space between MH wall and weir plate at point 15" pipe discharges from detention,
into the MH /weir structure (A2). (Rev. 1) Addressed.
p. General Note for SWM Plans #2 requires pipe and riser joints to be watertight. Provide detailed
notes and specifications for joint between 15" pipe and MH Str. A2, and elsewhere, as needed.
(Rev. 1) Addressed.
q. Provide /show steps, MH Str. A2. Provide step detail. Review design to ensure no conflict
between steps and weir plate. (Rev. 1) Addressed.
r. Provide profile of pipe from Str. A5 to detention Pipe B. (Rev. 1) Addressed.
s. Ensure pipe slope from Str. A5 to detention Pipe B > 0.5%. (Rev. 1) Addressed.
t. Label detention pipe A, and detention pipe B, in plan view. (Rev. 1) Addressed.
u. Show and provide SWM Facility and permanent drainage easements. (Rev. 1) Partially
addressed. As follow-up: Provide permanent drainage easement. (Rev. 2) Addressed. See 18-
32.7.4.2 /text below:
a. Easements required. The following easements shall be required:
An easement for all stormwater management facilities and drainage control improvements located
on the site shall be established whenever the improvement is designed, constructed, or both,
beyond a street right-of-way or access easement, and shall extend from all drainage outfalls to an
adequate channel as defined in 9VAC25-840-10 that satisfies the minimum standards in 9VAC25-
840-40(19) to the boundary of the site.
v. Show and provide permanent access from Country Green Road, to the SWM Facility easement.
(Rev. 1) Addressed.
w. Record all necessary easements prior to VSMP approval. (Rev. 1) Addressed.
x. Dimension OP at discharge to intermittent stream. (Rev. 1) Addressed.
y. Label intermittent stream. (Rev. 1) Addressed.
z. Applicant proposes to purchase 0.32 lb./phosphorus nutrient credits. Coordinate nutrient credit
purchase with Ana Kilmer, Albemarle County, prior to purchase (434.296-5832—x3246). (Rev. 1)
Engineering Review Comments
Page 4of5
Acknowledged. Applicant response: `Not yet completed.' (Rev. 2) Applicant response: `In
progress.'
aa. SWM Plan booklet /post -developed SWM Map: Label point of analysis 1 and 2 (recommend visit,
handwrite, initial). (Rev. 1) Not addressed. Engineering recommends visit CDD to handwrite
/initial points of analysis, or, alternatively, submit revised .PDF. (Rev. 2) Addressed.
Link, Construction Record Drawing (As -built) requirements:
http://www.albemarle.org/upload/images/forms_center/departments/Community Development/forms/En ing eering
_and _WPO_Forms/WPO_VSMP _Construction _ Record_ Drawings Policy 23May2014.pdf
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. See A /Sec. 6 comments, above. Revise Sec. 6 Exhibit, as needed. (Rev. 1) Not addressed. See comment
Sec. A., item 4., above. (Rev. 2) Addressed.
C. 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. C3/C4: Show /label steep slopes. (Rev. 1) Addressed.
2. C3/C4: Provide additional contour labels. (Rev. 1) Addressed.
3. C5: Provide well protection, similar to tree protection. Provide visible barrier to help prevent damage to
existing well during construction. (Rev. 1) Addressed. Applicant response: `Well protection will not be
provided since the well is located within the 20' buffer not to be disturbed. We have, however, provided a
safety fence to keep construction related disturbances out of this area.' Engineering commends this
response.
4. C5: Request Site Plan and VSMP C5 provide 2.5" -3" high berm beneath /within outline of canopy (plan
view) to isolate spills that occur during vehicle refueling, from storm runoff. It may benefit Applicant to
consider reasonable means of limiting potential contamination of existing well located approximately 18'
from face of proposed retaining wall. (Rev. 1) Addressed/comment withdrawn. Applicant provides a
detailed rationale favoring withdrawal of request. Engineering accepts rationale. Comment withdrawn.
5. C-6: Revise incorrect sediment trap table, H value. (Rev. 1) Addressed.
Please provide two (2) additional full-size print copies of the VSMP plan for approval, one (1) additional
SWPPP at your convenience, to CDD front desk with cover stating, `Not for review, for stamped approval.'
Process (outline /Narrative):
1. The following items are needed before the VSMP application can be approved:
a. Execution and recording of stormwater management agreement. This can take up to a week to get
recorded, pending no changes are made to the County template.
b. Nutrient credits purchase and affidavit is provided, if nutrient credit purchase proposed.
c. Execution and recording of stormwater management facilities easement plat and deed. Review of
the plat can take up to 30 days, but we will do what we can to review quicker. Review can take
longer if changes are made to the deed template.
2. Once VSMP is approved, the following items are required before a land disturbance permit can be issued:
a. All bonds must be posted. Applicant must submit a bond estimate request form and fee. We will
then calculate the bond amount. Owner will then work with Ana Kilmer, Management Analyst, to
post the bond.
b. DEQ permit fee must then be paid and proof of payment provided (if > 1.0 acre).
c. Pre -construction application, fee and meeting request is then required.
Engineering Review Comments
Page 5 of 5
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 2-4 weeks to obtain all the correct signatures and forms.
Stormwater Management Facilities Maintenance agreements will also need 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 need to be submitted along with court recording fees.
After bonding and agreements are complete, county staff will need to enter project information in a DEQ database
for state application processing yarea of disturbance is 1.0 acre, or more. 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. 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.
Easements must be recorded prior to VSMP approval. Proof of purchase of nutrient credits is required to receive a
Grading Permit.
After DEQ coverage is issued, via the coverage letter (project >1.0 Ac), the County can hold a pre -construction
conference. Applicants will need to complete the request for a pre -construction conference form, and pay the
remainder of the application fee. The form identifies the contractor and responsible land disturber, and the 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
joint VSMP (not required for this project) and 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;
htW://www.albemarle.orgJdeptforms.asp?department=cdengno
Ifyou have questions or concerns, please contact me at janderson2galbemarle.org or at 434.296-5832 ext.
3069.
Thank you.
J. Anderson, Engineering Division
WP0201800049 Oak Hill Convenience Store 011419rev2