HomeMy WebLinkAboutCorrespondence - 165 FLAGSHIP DRIVE 12/9/1996 UMMEW mum
MHF Design Consultants, Inc. 12.6 Manor Parkway Salem, NH 03079•TEL(603) 893-0720•FAX(503)993-0733
FACSIMILE COVER SHEET / TRANSMITTAL.
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From: FRANK C. MONTEIRO, P.E.
Company: MHF DESIGN CONSULTANTS, INC.
Phone: (603) 803-0720
Fax: (503) 803-6733
Date:
Pages inclUding this
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M11F Design Consultants, Inc. 12-13 Manor Parkway• Salem, NH 03079 e TEL(603)893-0720 • FAX (60,3)893-0733
December 12, 1996
Mr. John Chessia, P.E.
Coler & Colantonio, Inc.
101 Accord Park Drive, Suite One
Norwell, MA 02061-1685
Re: United Plastics Fabricating
165 Flagship Drive
N. Andover, MA
Sub: Engineering Review
Dear John:
Attached for your review are revised site plans and drainage calculations for the above
referenced project. These revisions incorporate your review comments dated November 27,
1996. The following is our response to your comments which are numbered to correspond with
your review letter:
1. No response required.
2. The soil types on the data sheets have been changed to reflect the appropriate soil
type, but the original runoff value used (70) in the calculation was for a soil with a
HSG C.
3. The sheet flow length has been changed to 100 feet and the roughness coefficient has
been revised to 0.40 which reflects a "light woods" condition. The adjustment of
these two numbers has increased the peak rate of runoff for the 2, 10 and 100 year
storm events. These peak flows were recalculated using the computer program
"Hydraflow Hydrographs for Windows" by Intelisolve. Hydrographs for the peak
flows for the 2, 10 and 100 year storm event were plotted and are located in the
Appendix to the report.
4. The design of the drainage swales utilizes the peals flow rate generated for the 100
year storm event by the SCS method. Peak flow hydrographs of the tributary areas
to the two drainage Swale areas are located in the Appendix of the report.
ENGINEERS 0 PLANNERS 0 SURVEYORS
MHF Design Consultants, Inc.
Mr. John Chessia, P.E.
December 12, 1996
Page 2 of 3
5. The storm sewer design tables have been revised and we have included both the
proposed storm drainage system as well as the existing system in the tables. The
design tables are located in Section D of the Appendix. A 10 year design storm was
utilized and the computer program "Stormcad" was used for the analysis. The excess
runoff from the swales associated with the 100 year design storm event will flow past
the inlets and onto the adjacent paved areas of the site. A rip rap swale has been
provided from the inlet area of drainage Swale #1 to the pavement area in order to
accommodate this potential excess runoff.
6. The drainage divide lines have been revised and the existing drainage system to the
west of the site has been included in the calculations.
7. We feel that there is adequate off-site topography in order to design and construct the
proposed improvements. We note that the wetland flags that were located by field
survey have corresponding elevations noted on the Grading & Utilities Plan (sheet
4 of 8).
8. Confirmation of the wetland boundary is in progress.
9. Building elevations were submitted to the Planning Board at the public hearing on
December 3, 1996.
10. An additional benchmark has been added to the Grading & Utilities Plan (sheet 4
of 8).
11. Design of the retaining wall is in progress.
12. A drop inlet detail has been added to the Detail Sheet (Sheet 7 of 8).
MI-IF Design Consultants, Inc.
Mr. John Chessia, P.E.
December 12, 1996
Page 3 of 3
13. According to record plans, this 8" drain is a roof drain and the plans have been
revised accordingly.
Please contact our office if you have any additional comments. Thank you for your
cooperation.
Very Truly Yours,
NfflF esign Consuftants, Inc.
ra k C. Monteiro, P.E.
Pr' cipa
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CR45796
45796 LLTR
Enclosure
cc: Ms. Kathleen Colwell - N. Andover Planning Dept.
Greg Wiech - Channel Building Co., Inc,
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MHF Design Consultants, Inc. 92.-B Manor r Parkway«Sal rn„NCI 693-0720 FAX(603)893-0733
December 17, 1996
Ms. Kathleen Bradley Colwell
Town of North Andover
Community Development & Services
146 Main Street
North Andover, MA 01845
VIA FAX
Re: United Plastics Fabricating
165 Flagship Drive
Proposed Building Expansion
Dear Kathleen:
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As you know, the above referenced project is scheduled for the Planning Board agenda
tonight. We hereby request a continuance until the next hearing on January 7, 1997 in order
to resolve minor issues with the Conservation Commission.
Thank you for your cooperation.
Very Truly Yours,
MHF esign Consultants, Inc.
I
r nk C. Monteiro, P.E.
P incipal
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cc: Greg Witch - Channel Building Co.
ENGINEERS PLANNERS SURVEYORS
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