Staff Review & Comments (11/20/2014)

“Lorimer Road Street Improvement Petition – Staff Review and Comments”
(11/20/2014)

In reverse-chronological order –

 

Approved.

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From: Powell, Donetta
Sent: Wednesday, October 15, 2014 3:27 PM
To: Dawson, Carl
Cc: Upchurch, Jimmy
Subject: Variance Requests for the Lorimer Road Street Improvement Petition

Carl,

We are preparing a street improvement petition for Lorimer Road from Kaplan Drive to Garland Drive and will need your approval of variances to the UDO and street design standards. Based on our Transportation Staff the street classification of neighborhood yield, staff is recommending we construct the UDO required 27’ back-to-back street section, including a 6’ wide sidewalk on a variable 6’ setback on the west side. We are asking for variance approvals to omit the required 5’ utility easement as we are not proposing to relocate the existing utilities and to omit the 2nd sidewalk on the east side but to include grading the berm to 3.5 feet. Please let me know if you have any questions or need any additional information prior to authorizing the requested variances. Thanks!

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Sorry for the late response. I’m not sure how this one slipped through the cracks. The only correction I would make to the response from our Roadway group is that a Neighborhood Local street section calls for a 31’ b-b street rather than the 27’ b-b mentioned in their comments. The rest of their assessment is on point. If you need any additional information please let me know.

 Thanks,

Daniel G. King, PE

Transportation Engineer, Transportation Services Division

City of Raleigh Public Works Department

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Mark and Scott,

I have completed a cursory evaluation of stormwater quality aspects of a property owners’ request to install curb and gutter and sidewalk along Lorimer Road from Kaplan Drive to Garland Drive.

Here are my comments, conclusions, and opinions:

  • Much of the existing roadside ditches and swales are vegetated. A substantial portion of the first flush street runoff probably infiltrates or is filtered in the ditches and swales.
  • Installation of curb and gutter and sidewalk would increase the urban runoff burden on Bushy Creek by decreasing time of concentration and filtering and increasing runoff volume and peak flow rate.
  • I observed no locations along the project length appropriate for stormwater BMPs.
  • There are sections of roadside ditch that are actively down-cutting, less than 10% of the total ditch length. These could be repaired and stabilized (light rip rap, cobbles, check dams, vegetation, education of residents about mowing, other techniques) on a spot-basis, as we are pursuing on the Laurel Hills Stormwater Management Study with Hazen and Sawyer.
  • There also are ditch sections that appear to have down-cut in the past and have been stabilized (also less than 10% of total length).
  • I suspect that what the property owners actually want is just sidewalk, not curb and gutter, and that they generally like the character of the neighborhood without curb and gutter. (I have heard this sentiment repeatedly in Laurel Hills.) But they correctly have been told that, per City policy, they cannot get sidewalk without also getting curb and gutter. Also that sometimes curb and gutter must be installed with the sidewalk because of ROW-width constraints.
  • The urban runoff burden on Bushy Creek would be lessened to the extent that….
  • – sidewalk could be installed without also installing curb and gutter,
  • – curb and gutter and sidewalk could be installed on only one side of the street, and/or
  • – stormwater BMPs could be installed along with curb and gutter and sidewalk.

I’d be happy to discuss with you.

Thanks, Kevin

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Notes and observations:

Existing Conditions

  • The project length is 2,890’ (per Donetta’s email). So, frontage for both sides is double that, 5,780’, of which I’d estimate 5,500’ has ditches.
  • An i-Maps map with topo and stormwater features is attached and at S:\Kevin Boyer\Lorimer Road.
  • I visited the site on 6/7/2014, a dry day.
  • The ROW width appears to be 50’. Per Donetta’s email, the pavement width is 22’.
  • For the most part, the street pavement appears to be crowned near the center. A few curves are superelevated, and a few short sections of straight run might slope to one side.
  • From what I observed, none of the intersecting streets has sidewalk.
  • The following streets have curb and gutter:  Lorimer south of Kaplan, Kaplan, Athlone, Woodlinks, and Merwin.
  • The following streets do not have curb and gutter:  Onslow (dirt/gravel road), Garland, and Lorimer north of Garland.
  • Despite some steep slopes, roadside ditches and swales (‘ditch’ here could mean either) generally are stable. Exceptions….

Active down-cutting :

  • – 200’ along SE side of Lorimer, from Athlone to ~200’ SW (75’ of this is severe, where steep ditch is mowed : see two photos at S:\Kevin Boyer\Lorimer Road).
  • – 200’ along NW side of Lorimer, from Onslow to 200’ NE (all steep and mowed).
  • – This total 400’ of active down-cutting ditch is about 7% of the total ditch length.

Past down-cuts, appear stabilized, maybe by residents:

  • – 300’ along S side of Lorimer, from Merwin to 200’ W* has old rip rap that’s holding up well.
  • – 60’ along SE side of Lorimer, from Onslow to 60’ NE has four check dams that are controlling, but not preventing down-cutting. (well done, if by resident)
  • – This total 360’ of down-cut and stabilized ditch is about 7% of the total ditch length.

Drainage

  • The whole project length drains to Bushy Creek, about a third from the NW and two-thirds from of the SE.
  • Based on topo, roadside ditches appear to receive runoff mostly from the Lorimer ROW, parts of a few cross-street ROWs, and a narrow width of the yards parallel to the ROWs. Most of the yard areas drain along other paths to Bushy Creek.
  • A significant exception to the above is the ditch on the S side of Lorimer from Merwin to 300’ W of Merwin (same as * above). It looks like this ditch carries runoff from 30 acres or more.
  • I doubt there is street flooding along the project length – too steep. I imagine Bushy Creek can flood at the Lorimer culvert, given the large impervious areas upstream along Western Boulevard and the Beltline.

 Water Quality Benefits/Burdens

  • Because much of the existing roadside ditches and swales are vegetated, it’s reasonable to think that a substantial portion of the first flush street runoff would infiltrate or be filtered. The street’s steepness tends to work against infiltrating and filtering.
  • To the extent that curb and gutter and sidewalk are constructed along the project length, time of concentration and filtering will decrease, and runoff volume and peak flow rate will increase, all contributing to increasing the urban runoff burden on Bushy Creek. We’d need assumptions and calculations to quantify the increased burden.
  • I observed no locations along the project length that appeared appropriate for stormwater BMPs. Other than ROW, I doubt there is City-owned property (I did not check records).
  • A BMP that could be incorporated into a curb and gutter design within the ROW is Filterras. I know of none yet in Raleigh, but they have been approved in Raleigh via a variance for a store on Capital Boulevard. Durham, Fayetteville, Swansboro, and Edenton each has several Filterras. They are popping up like dandelions in the Chesapeake Bay basin.)

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Ken

I walked and drove the entire section of Lorimer Road from Kaplan Dr. to Garland Dr. Following are my observations and comments:

               OBSERVATIONS:

  1. This entire section is asphalt pavement without any curb & gutter and sidewalk except that the two properties fronting Kaplan Dr. have curb & gutter but no sidewalks.
  2. The pavement width for this section varies at various location with width as narrow as 19 ft. and posted speed limit is 25 mph.
  3. The entire street has drainage ditch/swale and heavily wooded on both sides. There are steep side slopes at locations along the street. There is a stream crossing just south of Onslow Road and looks like all of this roadway drains into it.
  4. Right of way for the street appears to be 60 ft. as measured from I-maps.
  5. Asphalt pavement has numerous patch repairs with several cross trench repairs. The street has numerous alligator cracks and at some location heaving of the pavement was observed.
  6. Side streets Wood Links Rd., Athlone Pl. and Merwin Rd. have curb & gutter but does not have any sidewalks. Onslow rd. is a gravel road.
  7. The pictures taken can be looked in folder at  P:\2014_Projects\DC20140012Lorimer\ENGINEERING\DESIGN\PICTURES\6-10-2014

COMMENTS:  If this street is widened to 27 ft. with curb & gutter and sidewalks per City standards, following improvements will be required

  1. The entire pavement section may need rehabilitation due to its present condition and construction activities for the project.
  2. Substantial embankment and cuts will be required for widening. Additional right-of-way may be needed.
  3. Extensive clearing and grubbing will be needed.
  4. A storm drainage system will be needed to collect and drain the run-off to stream.
  5. Condition of existing underground utilities is unknown. This may have to be checked for their integrity

Let me know if you need any additional information.

Mukund R. Moghe, PE, MS

Project Engineer-II

City of Raleigh Public Works Department

Design/Construction Division

 

 

From: Dunn, Kenneth
Sent: Monday, June 09, 2014 12:03 PM
To: Moghe, Mukund
Subject: FW: Request for Staff Comments-Lorimer Road from Kaplan Drive to Garland Drive

Mukund,

Can you look into this request.  Sorry for the late notice, apparently it slipped through the cracks.

Thanks,

Ken

Ken Dunn, PE

Senior Project Engineer

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Donetta – Please incorporate the existing sanitary sewer and water mains (map attached) along with their associated appurtenances into your design and installation for the proposed upgrades of Lorimer Road.  If you need additional information, please let me know. –

Russ Talley

Public Utilities

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 I have no specific comments for this location.

 Christine Darges

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Traffic Count from Rebecca Duffy

 

Site:                          [Lorimer 19] @ Kaplan

Time:                        10:00 Wednesday, May 28, 2014 => 10:00 Thursday, May 29, 2014

* Virtual Day=291, 60 minute drops

0000 0100 0200 0300 0400 0500 0600 0700 0800 0900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

   2   0   0   3   0   3   4   19   24   12   15   21   23   10   26   29   19   27   13   15   16   9   0   1

AM Peak 0800 – 0900 (24), AM PHF=1.00 PM Peak 1500 – 1600 (29), PM PHF=1.00

 

Site:                          [Lorimer 20] @ Garland

Time:                        10:00 Wednesday, May 28, 2014 => 10:00 Thursday, May 29, 2014

* Virtual Day=550, 60 minute drops

0000 0100 0200 0300 0400 0500 0600 0700 0800 0900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

   3   3   0   0   3   5   13   20   50   20   25   55   25   25   45   44   34   42   54   28   26   15   9   6

AM Peak 1100 – 1200 (55), AM PHF=1.00 PM Peak 1800 – 1900 (54), PM PHF=1.00

 

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I have no comments.

Christopher W. McGee, PE

Transportation Field Services Manager

Public Works Department

City of Raleigh

 

From: Powell, Donetta
Sent: Thursday, May 22, 2014 10:00 AM
To: Dunn, Kenneth; Lamb, Eric; Kallam, Paul; Senior, Mark; Duffy, Rebecca; Darges, Christine; Talley, Russ
Cc: Johnson, Chris; Niffenegger, Jed; Baldwin, Jennifer; McGee, Chris; Alford, Brian; Upchurch, Jimmy
Subject: Request for Staff Comments-Lorimer Road from Kaplan Drive to Garland Drive

We have received a request for installation of curb and gutter and sidewalk along Lorimer Road from Kaplan Drive to Garland Drive. The existing conditions consist of a 22’ strip pavement throughout per our Public Works Street Maintenance Log running approximately 2,890’ from Kaplan to Garland. Most likely this will be a retrofit due to UDO requirements. It is inside the City limits and is classified as a “local” neighborhood street.

Please provide your comments to us by Thursday, June 12, 2014.

If you have any questions or comments, please reply via e-mail or call Donetta Powell at 996-4054. Thanks!

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