HomeMy WebLinkAboutSDP202200067 Review Comments Final Site Plan and Comps. 2022-12-30a$ County of Albemarle
m COMMUNITY DEVELOPMENT DEPARTMENT
Site Plan Review
Project title: Maplewood Development— Final Site Plan
Project file number: SDP202200067
Plan preparer:
Scott Collins, PE, Collins Engineering
200 Garrett Street, Suite K, Charlottesville, VA 22902
scott(&,,collins-ent ineering.com
Owner or rep.:
Maplewood Investments LLC
455 Second Street SE, Suite 201
Charlottesville, VA 22902
alan(a),,riverbenddev. com
Plan received date:
27 Dec 2022
Date of comments:
30 Dec 2022
Review coordinator:
Syd Shoaf
Reviewer:
John Anderson, PE
401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
Telephone: 434-296-5832
WWW.ALBEMARLE.ORG
Engineering has completed review of the Final Site Plan, and offers the following review comments:
1. General (for ESP approval):
a. Approved WPO required.
b. WPO plan approval requires:
i. Recorded SWM facility /public drainage easement, with deeds.
ii. Recorded SWM facility Maintenance Agreement.
iii. Recorded temp grading /access easement w/ TMP 46114-3.
2. Sheet 2: General Note 4., please clarify `the site is currently under construction,' since it does not appear to
be.
3. Sheet 5: Provide copy of recorded variable width temporary grading and access easement on adjacent
parcel, TMP 46134-3 (Forest Lakes Self -Storage); this item is required for Final Site Plan Approval.
4. Sheet 8: Increase pipe DIA pipe UGDI to Str. 38 to 24", since proposed 18" DIA capacity =8.28cfs while
Qt=8.27cfs.
5. Sheet 9: A number of pipes are proposed 0.50% (Minimum). Flexible HDPE at 0.5% risks error that may
be difficult or expensive to remedy if deflection or deformation relating to flat grade exceed max. tolerance.
Encourage increase 0.50% slightly, if only to 0.55%, to offset risk during construction, to allow slight error.
6. Sheet 9: Revise lower -right text block reference to 2008 R&B Standards to ref. 2016 R&B Std., instead.
7. Sheet 10: For Caspian Lane, provide VDOT underdrain at cut /fill transition, Sta. 13+10 approx.
8. Increase Str. 16 DI throat length to 10', inlet is located on Drexel Lane, a principal access and final site
plan inlet design table (VDOT LD-204), sheet 8A, SDP202200067 indicates Lt, this inlet=10.68' but inlet
throat length provided is only 6' causing inlet carryover during 6.5" /hr. storm intensity event.
9. Sheet 3
a. Revise label /relocate leader line at SE comer of building #2 to `Proposed 5' conc. SW' that points
to sidewalk.
Engineering Review Comments
Page 2 of 4
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b. Entrance. Drexel Lane : driveway entrances. Caspian Lane : stop sign. Int. Drexel - Caspian.
Entrance from Worth Crossing, drives, and stop sign at building 4, discussed below. It may be
possible to preserve units and meet standards, but there is point at which maximum density meets
design /safety standards, beyond which, spatial constraints limit number of units. Proposed
buildings, internal network, recreational areas, additional parking, secondary emergency access,
SWM, and aesthetic features reflect design that nearly meets (VDOT) standards. A stop sign at
Drexel -Caspian must be visible (item 9.b.iv., below). At Applicant's discretion, two stop signs on
Caspian may replace single stop on Drexel, revised thru-motion likely meets drivers' expectations.
i. Provide >_ 35' throat length between curb at Worth Crossing and drive entrances nearest
Worth Crossing (bldg. #2 and #3). See VDOT Road Design Manual, Apppx F, Sec. 4
Entrance Design, p. 104 for definition, Commercial Entrance (Drexel Lane -Worth
Crossing is a commercial entrance), design subject to p. 109, Table 4-2, Summary of
Entrance Throats, and Fig. 44A Entrance Throat Detail. Increase distance from curb to
radius return, first driveway/s to > 35'.
Number of Egress Lanes
(left, thru and right)
Minimum Throat Length
Feet
1
35
2
75
3
200
4
300
TABLE 4-2 SUMMARY OF ENTRANCE THROATS
Source: Transportation & Land Development 20d Edition 2003, Koepke and Stover
Inadequate entrance length can also produce hazards to entering traffic on site.
Particularly where the on -site parking can back out of and block the entrance and prevent
a vehicle from entering. To avoid this problem, a distance of at least 50 feet is used on
entrance length where back out parking may interfere with entry movement.
Inwrrect Correct
------------- --------
FIGURE 4-1A ENTRANCE THROAT DETAIL
Please compare with sheet 3 Entrance design
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Engineering Review Comments
Page 3 of 4
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ii. Revise drive entrances (all entrance) to show radii at each driveway.
iii. Revise driveways of south -most units, building #4, so accessible, similar to blue -circle
/check mark west -most units, building #2, which are accessible. The two south -most unit
drives at bldg. #4 do not work. Design must ensure each unit has accessible, safe drive
entrance without vehicles crossing travelway centerline, whether CL is marked or not.
.._...._.. .. ,..--------------.....,.FPW .-1.
CG2CUR6 PARKING ---'-- - _
SIGN 495'R CASPIAN LANE
(28'PRIVATE ACCESS RMLSACE----
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- PROPOSED
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MULTI -FAMILY
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13 UNITS
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iv. South edge of building #4, < 1.0' to BC, Drexel Lane, obscures stop sign. Revise to
ensure stop sign at Caspian -Drexel is visible and does not overhang the travel way.
(P) STRE& SIGN
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STD.
Thank you.
Engineering Review Comments
Page 4 of 4
(P) VDOT STD. /
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Please call if any questions — tel. 434.296-5832-x3069, or email 4anderson2(a)albemarle.org.
SDP202200067_Maplewood Dev_FSP_123022.docx