HomeMy WebLinkAboutConsultant Review - 880 GREAT POND ROAD 3/24/2008 andover 1 East River Place
consultants
inc. p Meth en, Massachusetts 01844
V Tel. (978) 687-3828
Fax (978) 686-5100
Richard A. Nardella, Chairman RECEIVED
North Andover Planning Board
Town Offices MAR 2 5 2008
120 Main Street NOR"tH ANUU\1cR
North Andover, MA 01845 PLANNING DEPARTMENT
March 24, 200$ :t m l Andover Planning Board
RE: 880 Great Pond Road—Special Permit—Engineerin ,R viv ,
Dear Mr. Chairman,
In December 2007 we submitted an application for a Watershed Special Permit for the
proposed project at the address listed above. The application and proposed Site Plan were
passed along to Darryl Gallant at VHB for review. On January 28, 2008, Mr. Gallant
submitted his comments. The following are his comments (in italics)with our responses
immediately following.
1. (4.1363.c.ii.3)Hasa variance been granted for the construction of this dwelling,
as required by this section?
On August 14,2007,the Zoning Board of Appeals granted a variance for the construction
of the proposed structure, as required.
2. (4.136.3.c.iii.4 and S)A note should be added to the plans prohibiting the use of
lawn care or garden products during construction that may contribute to the
degradation of the public water supply or that are not organic or slow-release
nitrogen, as specified by this section.
A note prohibiting the use of these chemicals has been added to the plan.
3. (4.1364.c.ii.4) The Applicant should revise the 100'Buffer Zone dimension to
read 100'Non-Disturbance Zone.
Civil Engineers * Land Surveyors * Land Planners
rndov r
cornultrnt
° Inc.
This modification to the text has been made on the plan.
4. (4.136.4.c.iii)A written certification by a Registered Professional Engineer,
stating that there will not be any significant degradation of the quality or quantity
of water in or entering Lake Cochichewick has not been provided, as required by
this section.
A written certification letter has been drafted and is attached.
5. (4.1364.c.vii) The Applicant should provide projections of down gradient
concentrations of nitrogen,phosphorous and other relevant chemicals, as
required by this section, or request a waiver.
Steven Eriksen of Norse Environmental Services,Inc. has put together a report, dated
March 11, 2008, detailing the down-gradient concentrations of these chemicals for the
pre and post development conditions. A copy is attached.
6 (4.136.4.g) The Applicant has provided an infiltration trench to recharge roof
runoff. Have other groundwater recharge methods been considered for the
driveway and or deck areas.
The proposed driveway will be constructed of pervious pavers and will be graded toward
a catch basin that will be connected to an infiltration trench. The deck will include a
decking material that will be properly spaced to allow rain to pass through to the surface
below.Underneath the deck a pervious gravel patio is proposed.
7. The Applicant should note that the Locus Plan shows Haverhill as the bordering
town to North Andover. This should be revised to Boxford.
This revision has been made to the plan.
8. Have test pits been taken at the location of the proposed infiltration trench? The
Applicant should verify that there is a 2-foot separation between annual high
groundwater and the bottom of the trench. At a minimum, this 2-foot separation
should be specified on the Infiltration trench detail.
ndover
consultants
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Test pits have been performed at the proposed infiltration trench locations and the proper
separation between groundwater and the infiltration trench has been ensured. Test pit data
is attached.
9. A detail should be added for the proposed retaining wall.
This detail has been added to the plan.
10. A detail/typical section should be added for the proposed paver driveway.
This detail has been added to the plan.
Please feel free to contact us at any time to discuss the project. Thank you.
Sincerely,
ANDOVER CONSULTANTS,INC.
_.
Patrick over
Project Engineer