HomeMy WebLinkAboutWPO201400039 Review Comments WPO VSMP 2014-10-16�pF A
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COUNTY 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:
Van Dine Plaza
Plan preparer:
Mike Myers, Dominion Engineering [172 S. Pantops Drive, Charlottesville, VA
22911, mmyersgdominionene com]
Owner or rep.:
Auto LLC [1389 Richmond Road, Charlottesville VA 229011
Plan received date:
29 April 2014
(Rev. 1)
29 July 2014
(Rev. 2)
23 September 2014
Date of comments:
27 May 2014
(Rev. 1)
29 August 2014
(Rev. 2)
16 October 2014
Reviewer:
John Anderson
County Code section 17 -410 and Virginia Code §62.1- 44.15:34 require the VSMP authority to act on
any VSMP permit by issuing a project approval or denial. This project is denied. The rationale is
given in the comments below. The application may be resubmitted for approval if all of the items
below are satisfactorily addressed. The VSMP application content requirements can be found in
County Code section 17 -401.
A. Stormwater Pollution Prevention Plan (SWPPP - WP0201400039)
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.
SWPPP dated July 28 September 19, 2014 (Rev. 2), requires revision:
a. Please use 5 -pg document titled VSMP Construction Permit Site Inspection Report shared
during separate project meeting Aug. -28 to guide SWPPP revision (language /content).
(Rev. 2) Comment addressed.
b. Table, p. 4, incorporates SWM and ESC plans by reference (LocAmoN). While table is
helpful, plans referenced by SWPPP must be included with SWPPP. Legal document
retention limits pose risk that plans referenced by SWPPP (but not included) may be
difficult to locate or cease to exist. The table is a good idea, but please include tri -fold
sheets of each referenced plan sheet. (Rev. 2) Comment addressed.
c. Ensure that Location , b., above, actually reports or presents information. For example,
SWM Sheet 1 does not present "receiving water names, including the ultimate receiving
water." (Rev. 2) Comment not addressed. Name stream, unnamed tributary to
"NAME ultimate receiving water." Show on one or more SWM plan sheets, with SWPP.
d. As an alternative to format submitted, you may elect to use EPA SWPPP template which
may become the default standard since it reflects VAR10 requirements well. If you
request word file of template, I will be glad to send it. (Rev. 2) Comment addressed.
e. If continue to rely on current form (not template), please number pages up to Appendices.
It is difficult to refer to unnumbered pages of SWPPP. (Table on p. 4 refers to p. 3)
(Rev. 2) Comment addressed.
f. TOC, II, B, 5: Inspections: Ensure that inspections are conducted at required frequency:
[§ II F 2. A -c.: Construction GP No. VAR10] (Rev. 2) Comment addressed.
g. TOC, II, B, 2, c (i) /Fuels and oils —SWPPP states `On -site vehicle refueling will be
Engineering Review Comments
Page 2 of 8
conducted in a dedicated location away from access to surface waters. Since the location
of fueling activities will periodically move during construction, the design plans do not
contain a specific location.' While reasonable, this statement is unacceptable. A location
is precise level of detail required to be shown on (plans included with) a SWPPP. Please
include plan sheet that shows one or more vehicle refueling locations. SWPPP:
"Containment berms will be located adjacent to the refueling area that will contain any
inadvertent spills until they can be cleaned up." Statement requires revision: furnish
design details for containment berm downslope of refueling area. Show refueling area
and design details on plans; include on plans in SWPPP. "Any on -site storage tanks will
have a means of secondary containment. In the event of a spill, it will be cleaned up
immediately and the material, including any contaminated soil, will be disposed of
according to all federal, state, and local regulations." Any on -site fuel storage tanks must
include impermeable passive design that limits accidental or inadvertent loss. Fuel loss
can occur any time. Fuel spill /storage containment section of SWPPP must furnish details
of on -site systems that operate less as response to emergency than to prevent emergency.
SWPPP narrative commitment should be supplemented by designs for refueling/fuel
storage containment. (Rev. 2) Comment partially addressed. Minor edits: Review and
revise text, p. 8, B.(1)(a) to reference E3, which indicates specific location for refueling.
Although refueling containment berm is shown on E3, there is no detail — please furnish
detail on SWPPP/E3 with at least prelim dimensions; without this, there is no design.
Also, p. 8/13.(1.)(a) and (b) are inconsistent —(a) makes provision for on -site refueling,
while (b) explains use of a small, 20 -gal pick up bed fuel tank —in which case there may
be no need for berm spill containment. Furnish preliminary dimensions for berm, if intent
is to bring fuel carrier transports on -site; eliminate berm containment if bed - mounted
pick -up is sole means of refueling. Replace word `feeling' with `fueling.'
h. TOC, II, B, 2, c (iii) —Show petroleum product storage location on plans (in SWPPP).
(Rev. 2) Comment addressed.
i. TOC, II, B, 2, f —Show paint and chemical storage location on plans (in SWPPP). (Rev.
2) Comment addressed.
j. TOC, II, B, 2, g (i) —Show concrete truck washout area on plans; site may not drain to
inlet or stream. (Rev. 2) Comment addressed.
k. TOC, II, B, 2, i /Sanitary Waste —Show portable lavatory location/s, equip with berm or
silt fence downslope to contain sanitary waste in event of spill; show on plans (in
SWPPP). (Rev. 2) Comment addressed.
1. TOC, 11, B, 4 1Maintenance Revise bold text to read "shall be repaired before the next
anticipated storm event or as soon as practicable" to "as soon as practicable but no later
than seven days after discovery." [VAR 10 §II G.1]. (Rev. 2) Comment addressed.
m. TOC, II, B, 5 1Inspections — Revise inspection frequency to be consistent with VAR 10,
Part II, F. See also, Erosion Control Plan comments, #11, below. (Rev. 2) Comment
addressed.
n. Registration statement dated 7/29/14, item 9, states Area to be disturbed - 2.19Ac. This
appears inconsistent with SWM plan estimate of disturbance. (Rev. 2) Comment
addressed.
o. Darrin Duvalois (Scott's Backhoe Service, Inc; RLD #: 34433) is authorized as SWPPP
Coordinator, but unless this individual exercises overall responsibility for environmental
matters on this project or holds a position equivalent to positions outlined in VAR 10,
then authorize alternate as SWPPP Coordinator. Responsibilities attendant upon SWPPP
Coordinator surpass expectations placed on a RLD. [Ref. Part III K 2 of GP] (Rev. 2)
Comment addressed.
p. New —show general location of the metal (non- hazardous waste) dumpsters in staging area
[p. 9/(2)], SWPPP, sheet E3.
q. New — Please complete last sentence, p. 14.
2. SWPPP (maintained at site) should not be bound: 3 -ring binder allows addition and revision,
including plan revisions, and mandatory records of self - inspection, monitoring, incident logs.
(Rev. 2) Comment addressed.
Engineering Review Comments
Page 3 of 8
3. Although SWPPP (cover) is signed (07/29/14), Certifications Statement is missing. Furnish
certification, exactly as follows: (Rev. 2) Comment addressed.
Certification. Any person signing a document under Part III K 1 or 2 shall make the fallowing
certification:
"I certify under penalty of law that I have read and understand this document and that this document
and all attachments were prepared in accordance with a system designed to assure that qualified
personnel properly gathered and evaluated the information submitted. Based on my inquiry of the
person or persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate, and
complete. I am aware that there are significant penalties for submitting false information, including the
possibility of fine and imprisonment for knowing violations."
4. Have proper corporate or partnership Authority sign and date Certification Statement. [VAR 10
§III K. La/ K.4]. (Rev. 2) Comment addressed.
B. Pollution Prevention Plan (PPP) - Addressed under Stormwater Pollution Prevention Plan, above.
The PPP content requirements can be found in County Code section 17 -404.
C. Stormwater Management Plan (WPO201400039)
VSMP Regulation 9VAC25- 870 -108 requires the VSMP authority to approve or disapprove a SWMP. This plan is
disapproved, and the reasons are provided in the comments below (2 comments: 1 new, both minor). The stormwater
management plan content requirements can be found in County Code section 17 -403.
1. Include Albemarle County General Stormwater Notes. (Rev. 1) Comment addressed.
2. Provide Stormwater Narrative. (Rev. 1) Comment addressed.
3. Identify critical slopes. (Rev. 1) Comment addressed — Follow -up: As discussed during unrelated project
meeting on August 28, 2014, Steep Slopes applicability (§ 18- 30.7.4) and design standards (§ 18- 30.7.5)
limiting retaining walls to 6' on managed slopes appear to apply. However, 9 -24 -09 Final Site Plan
approval exempts project from applicability (§ 18- 30.7.4) or design height requirements.
4. Include inlet structure detail (DI -313, DI -3C). (Rev. 1) Comment addressed.
5. Revise plan date (title sheet references topography field verified in April 2014, yet plans are dated March
19, 2009). (Rev. 1) Comment addressed.
6. Review and revise (if necessary) Redi -rock Gravity Wall design to accommodate vehicle surcharge (sheet
C4); this wall is required for SWM facilities and other infrastructure. (Rev. 1) Applicant response
confirms design will accommodate vehicle surcharge.
7. Use impervious cover computations to calculate %RR for developed area. Evaluate %RR against SWM
water quality requirements and proposed design. (Rev. 1) Comment addressed. %RR listed as 70% -
Filterra unit expected phosphorus removal =74 %; ref VDEQ, Technical bulletin #6 /Part II -C review criteria
[link: http: / /www.deq.vir ig nia.gov /Portals /0 /DEQ/ Water /Publications /TechBulletin6.pdf ]
8. Provide SCS routing calculations, to include: storage input data for underground detention system; outfall
control structures; inflow hydrographs; and routing method - storage- indication. Furnish a profile for the
6'DIA underground storage system that shows WSE for 2 -yr and 10 -yr storm events. (Rev. 1) Comment
partially addressed — Follow -up: As discussed during Aug 28, 2014 meeting, ACCD requests underground
detention system slope 0.5% to outfall to ensure positive drainage. With change in system slope, please
revise connecting pipe grades (detail 4, sheet SWMS). Please revise Hydraflow inputs to match plans
Engineering Review Comments
Page 4 of 8
(Model v. plan): Crest Len, 15.70' v. 3.85'; 24" DIA outfall, L= 71.00' v. 59.00'; slope ( %) outfall: 1.40 v.
1.70 (Model data: see Pond Report, Wed, 07/9/2014, included with Final Hydrologic /Hydraulic
Calculations for Van Dine Plaza, d. 16 -Jul 2014.) (Rev. 2) Comment partially addressed (Attachment to
email: October 15, 2014 3:51 PM). As follow -up, please revise Detention Compliance Table, SWM4,
consistent with hydrographs included with report dated Sept -18 -2014 sent as email attachment.
Supplement General Construction Notes for Stormwater Management, sheet C4: Provide details for 6' DIA
CMP underground system: include bedding/backfill material, depth, compaction, lift, and any other details
necessary to properly install this system. (Rev. 1) Comment addressed.
10. Revise Str -2 detail, sheet C5; provide scale drawing of outlet structure section detail. (Rev. 1) Comment
addressed.
11. Revise OP detail, sheet C5, consistent with stone apron length/width shown in OP detail, ESC Plan, sheet
E4. (Rev. 1) Comment addressed.
12. Review pipe lengths on Storm Sewer Profile, Str 1 - >7, sheet C5, and sheet C4 (plan view); lengths are
inconsistent. Confirm that total storage length is 300 -ft, 6' DIA pipe. (Rev. 1) Comment addressed; total
pipe length =350'. This includes two, 9 -ft L connecting pipes at each end bridging 4 lines (3 @85', 1 @75').
13. Furnish Filterra (Mfr) design chart: drainage area vs. unit dimensions. (Rev. 1) Comment partially
addressed. Identical 6' X 6' units for DAs ranging 0.14 to 0.46 Ac. are inconsistent with Filterra design
chart —ref detail, sheet SWM4, and Detail 5, sheet SWM5. Do not use impervious acreage to size units, but
total acreage. Units receive runoff from total acreage. It appears that units F3 and F7 should be 6' X 10',
units F4 and F6, 6' X 8' (Rev. 2) Comment addressed.
14. Relocate Filterra -F3; it must be immediately adjacent to a storm drain structure. (Rev. 1) Comment
addressed, review error.
15. Label existing edge of pavement, sheet C4. (Rev. 1) Comment addressed.
16. Revise design of 23'— 15" HDPE to avoid slope > 16 %. (Rev. 1) Comment addressed.
17. Please confirm that 12" pine, 15" poplar, and 15" maple (sheet C4) remain; photos (6- May -14) and aerial
photos indicate change between 2009 and 2014. Contact Albemarle County Zoning Division for questions
relating to Approved Site Plan, Conservation Plan (tree preservation requirements), and possible mitigation
requirements. If trees scheduled to remain have been removed, revise pre - development drainage area map,
Sheet D2, and revise location of tree protection fence to reflect existing conditions. (Rev. 1) Comment
not addressed. A Landscape plan for site (Letter of Revision #1, labeled C6, dated 7- 28 -14, sent by cover
July 29, 2014 to David Benish) does not match Landscape plan, SWM6, 7- 29 -14. Sheets must match.
SWM6 must be identical with Landscape plan, sheet C6. (Rev. 2) Comment addressed.
18. Sheet D1: relocate Filterra DA data (3, 4, 4A, 413, 6, 7) to table, or drawing margins. Uncover underlying
details. For 0.46 Ac. ST -7 DA, show how runoff above the parking lot (508' contour, and falling) reaches
STR -7. It appears that a portion of runoff may not reach Filterra F7 as indicated. (Rev. 1) Comment
addressed.
19. New: Revise calculations /report, after revising hydraulic model input data, see #8 above. (Rev. 2)
Comment addressed.
Engineering Review Comments
Page 5 of 8
20. New: Remove sheet SWM3. Site plans are not approved as part of SWM plans. (Rev. 2) Comment
addressed.
21. New: Provide safety railing for retaining walls >4 -ft high. Show railing in plan views, and furnish detail.
[ACDSM,8.B.3] (Rev. 2) Comment addressed.
22. New: Do not show riprap outlet protection (detention system) extending into stream, sheets SWM4 /6, D1,
D2. (Rev. 2) Comment addressed.
23. New: Plan view length of detention system outfall pipe (SWM4) is 55'; profile view is 59'. Reconcile.
(Rev. 2) Comment addressed.
24. New: Profile underground detention system length given as 300' (SWM5) but elsewhere as 350' — reconcile.
(Rev. 2) Comment addressed.
25. New: Select appropriate size Filterra units and revise size chart, sheet D1; see # 13 above. (Rev. 2)
Comment addressed.
26. New: Re- number one of the detail /s #5, sheet SWM5. (Rev. 2) Comment addressed.
27. New Q- Please revise worksheet, Short Version BMP Computations, SWM9, consistent with email sent
October 15, 2014 4:07 PM, and as discussed (with Mike Myers) 15 -Oct.
D. Erosion and Sediment Control Plan (ESOP - WPO201400039)
Virginia Code §62.1- 44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is
disapproved, and the reasons are provided in the comments below (2 comments: I new, both minor). The
erosion control plan content requirements can be found in County Code section 17 -402.
1. In Phase 1, extend temporary diversion dike shown on sheet E2, upslope, toward Rio Road. (Rev. 1)
Comment addressed.
2. In Phase 2, provide sediment trap at NE corner of site to intercept flow from 20 -ft fall in grade, sheet E3.
(Rev. 1) Comment addressed, per tel. conversation 7/9/14 (ST impractical).
3. Revise plan date (title sheet references topography field verified in April 2014, yet plans are dated March
19, 2009). (Rev. 1) Comment addressed.
4. Provide CIP and OP for existing 3 -24" HDPE culvert in addition to SF. (Rev. 1) Comment addressed.
5. Tree protection, sheet E3, may be unnecessary if 12" pine, 15" poplar, and 15" maple were removed. (Rev.
1) Comment addressed.
6. SF near 3 -24" HDPE appears to conflict with grade. Ensure SF will not prevent grading to final contour.
(Rev. 1) Comment addressed.
7. Sediment trap, sheet E4: given embankment height, embankment width (3') is insufficient. Embankment
height of 6 -ft. exceeds 5 -ft maximum. Please revise. (Rev. 1) Comment partially addressed; sediment
trap 58' x 23'dimensions reference 484' contour. Area wet storage (1:1 sideslopes) =55' x 20' x 3' = 3300
cf (122.2cy). Storage required =67cy x 1.9 Ac, 127.3 cy. Revise ST to provide 67 c wet (and dry) storage.
(Rev. 2) Comment addressed.
Engineering Review Comments
Page 6 of 8
8. Furnish SAF between LOD and sidewalk, Rio Road, and commercial property to SE. (Rev. 1) Comment
addressed.
9. New: Erosion and Sediment Control Narrative (a separate report), p. 2, item #17: paved CE with wash rack
is required. Pg. 4, Narrative, TEMPORARY CONSTRUCTION ENTRANCE (CE) — 3.02 — reference wash rack.
(Rev. 2) Comment partially addressed —As follow -up, please furnish paved CE with wash rack as
discussed 14 -Oct. Furnish Paved CE label, sheet E2. Also, comments 10, 13, below.
10. New: Include ACDSM paved CE detail on ESC plans (detail below). (Rev. 2) Please include detail -Also,
comments 9, 13.
11. New: Pg. 5/ESC Narrative: Transfer B11. MAINTENANCE SCHEDULE to plans. Ensure that ESC inspection
frequency satisfies minimal General VPDES (VSMP) Permit requirements. Owner- maintained ESC
inspections are required. [link:
http: / /www.deq.virginia.gov/ Portals/ 0/ DEQ/ Water/Publications /CGP2014.pol, (Rev. 2) Comment
addressed.
12. New: Pg. 7 /ESC Narrative, 18 1minor: Revise to read "Straw mulch is to be applied at 80lbs/l 000sf. " (Rev.
2) Comment addressed.
13. New: Sheet E2: CE appears to lie on adjacent property and on existing paved commercial entrance (TM 45-
102). Locate paved CE on TM 45 -101, or obtain temporary easement. Avoid damaging existing
commercial entrance paved surface. (Rev. 2) Comment partially addressed —As follow -up, please
furnish paved CE with wash rack as discussed 14 -Oct. Also, comments 9, 10, above.
14. New: Stone weir L -W and outfall apron (L) may be scaled, or extracted from detail 2 schematic /table data,
sheet E4, which may leave dimensions to chance. Label weir L -W and apron length in plan view, sheet E2.
(Rev. 2) Comment addressed.
15. New: Estimate Area of limits of disturbance, sheet E3. Ensure that ESC plan and VPDES registration
statement, Item 9, are consistent. Label sheet E3 with Area of LOD (sf, or Ac). (Rev. 2) Comment
addressed.
16. New 2 —Sheet E2: Silt fence (SF) obstructs access to (relocated) paved construction entrance; revise SF.
Engineering Review Comments
Page 7 of 8
Paved construction entrance for erosion control plans
STONE 70' MIN, —
CONSTRUCTION
ACCESS ij�—Y SM -2A ASPHALT TOP
COURSE E %I STING
2X 29 PAVEMLN
F" M-N. 2'A AGDREGATE BASE
PROFIL
STONE 70' MIN.
C4NSTROCTION ASPHALT PAVED
ACCESS A WASWfACK
EMSTING
2% X% PAVEVENT
2% 12' M9N.•
'MUST EXTEN❑ FULL WIDTH `---� �' POSITIVE DRAINAGE
OF INGRESS AND EGRESS io SEDiNEHT
TRAPPING DEVICE
OPERATION
PLAN
VIN. 005ITIVE DRAINAGE
TD SEDIMENT
TRAPPING DEVICE " M-1
FILTER CLOTH
SECTION A —A
.4 timi utnn ~. ker tap of 1 arch must be amtalled v;itb a nmui»nuu 1 inch bAcock
l,tstoff Ave i npphis,a a wa h l,oae will, a cliasnetes' of 1 -5 u,chee far adegtIate
wwtaut pre."we. Waxh ,cater uuist 4e carried a% -w from the enh'as:ce to m,
approved settline area to resnove 5edWnevt. Ali sedunent shaU be prevented from
entean`; storm drams. ditches or uatelcourcc4
PAVED WASH RACK
NO SGAiE
The VSMP permit application and all plans may be resubmitted for approval when all comments have been
satisfactorily addressed. For re- submittals please provide 2 copies of the complete permit package with a completed
application form.
Engineering plan review staff is available from 2 -4 PM on Thursdays, should you require a meeting to discuss this
review.
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 2 -4 weeks to obtain all the correct signatures and forms.
Engineering Review Comments
Page 8 of 8
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. 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.
After DEQ coverage is issued, via the coverage letter, 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 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= cdengwTo
File: WPO201400039 -Van Dine Plaza- 10 1 614rev2