July 23, 2014

Mr. Jarod Likar

Huitt-Zollars

Suite 550

6501 Americas Parkway NE

Albuquerque, NM 87110-5372

Re:	Hedges Residence

Grading and Drainage Plan

Engineer’s Stamp Date 4-22-14 (E22D007F7A)

Dear Mr. Likar,

Based upon the information provided in your submittal received June 25, 2014, the above referenced plan cannot be approved for Building Permit until the following comments are addressed:

Provide a fully completed Drainage and Transportation Information Sheet.

Provide calculations for existing and proposed flows that are in accordance with the approved Master Drainage Plan for the Sauvignon Phase II Subdivision by Bohannan Huston, Inc. Provide excerpts (plans and calculations) from the MDP that pertain to this property. Indicate how the grading design of the property is in accordance with the MDP. Indicate all your existing and proposed design assumptions including ones for land treatments and hydrology and provide all calculations with full explanation.

Provide a Grading and Drainage Plan with the following:

Existing and proposed contours and spot elevations on-site and to 20 feet off-site. Fully show that existing grades along the perimeter are being met with the proposed design.

Show all aspects of the plan to scale.

Provide a vicinity map and FIRM map.

Include the legal description and benchmark.

What are flow line elevations in Zinfandel? Does the driveway create a water block to prevent street flows from entering the property?

Wherever there are top of wall elevations, provide top of grade elevations in the same location.

A 12 foot wall is on the south side. Is the top of wall actually the top of wall or top of the retaining wall? A garden wall on top of that is advisable since a twelve foot drop is there. If a garden wall is on top of that, how will the wall drain out? Provide calculations for the opening and erosion protection. What protection will be at the bottom of the wall to prevent erosion?

Along the sides of the property, swales with erosion protection should be provided so the water does not enter the adjoining side properties or erode soil along walls.

On the east side of the residence, steep grades are dropping from the home. This seems impractical if someone needs to walk around the perimeter of the residence.

What are the elevations around the pool? No drainage should be entering the pool. A double dashed line is shown on the south side of the property but not described in the legend. What does that represent?

Retain the first flush. Per the City Drainage ordinance, the 90th Percentile Storm Event, which is 44 inches, is to be managed. Reduce 0.44 inch by the 0.1 inch for the initial impervious abstraction in Table A-6 of Section 22 of the DPM. Multiply the remaining 0.34 inch by your impervious area. This is the portion to retain.

Provide an electronic pdf of all calculations and drawings with stamps and signatures.

If you have any questions, you can contact me at 924-3994.

Sincerely,

Amy L. D. Niese, P.E.

Senior Engineer, Hydrology

Planning Department

C:	e-mail