MemoDATE: April 15, 1988
TO: Zoning & Planning Commission
FROM: Nancy S. Anderson
SUBJECT: EAW for the 63 unit apartment complex
The EAW has been completed for the 63 unit apartment
building on the southeast corner of State Highway No. 7 and
County Road 18. The EAW was favorable except for a higher
noise level during one hour. The following are the three
recommendations to meet the State standards for noise:
1) the building is constructed in such a way that
the exterior to interior sound level attenuation
is at least 30dB(A); and
2) the building has year -round climate control; and
3) the building has no areas or accommodations that
are intended for outdoor activities
The first recommendation can be met if the building is
constructed with acoustically rated windows. The second can
be met with an air conditioning system.
The last recommendation deals with items that either can be
eliminated or do not involve daily living. The staff feels
that if a person wants to use the swimming pool or tennis
courts it is their choice if they want to have ti a little
noiser. Maybe the pool should not be built. As to the
problem with the balconies facing the highways, the staff
does not feel this will present a problem. The actual
living area will not exceed the noise levels. During the
winter the balconies are not used, and even during the
summer, residents do not live on the balconies. The
balconies could be eliminated but we really don't feel that
is necessary. A resident can use the balcony if they
choose.
The staff is satisfied with the sound report and recommends
two more conditions be added to the Conditional Use Permit:
1. That the building is constructed in such a way
that the exterior to interior sound level
attenuation is at least 30dB(A)
2. The building has year -round climate control.
STBEMEMO
MEMORANDUM
northern sound
5155 East River Road N.E., #413
Minneapolis, MN 55421
612- 572 -1515
March 24, 1988
Mr. Erwin Stobbie
Stobbie Development Inc.
315 Pine View Lane N.
Plymouth, MN 55441
Re: Stobbie Development in Hopkins — SE corner of Highway 7 and County Road
18
Dear Mr. Stobbie:
On Wednesday, March 16, 1988, Northern Sound conducted a noise survey at the
subject location. The instruments and test procedures used are those
approved by the Minnesota Pollution Control Agency (MPCA). The weather
conditions were within acceptable limits: 27 deg. F temperature, 75Z rel.
humidity, 8 mph NW winds, and 30.3 in. Hg barometric pressure.
The measuring station was a high point within the site, and its approximate
location is shown in Figure 1.
The hours of the test were from 5:52 a.m. to 8:00 a.m. — they were chosen
because they are the transitional hours between the nighttime and daytime
hours of the State's noise standards (see Appendix A), and as the result,
the most sensitive to violations.
RESULTS
Figures 2 and 3 contain graphs summarizing the noise levels for the two
hours tested. As it can be seen, the State standards are only exceeded
during the 6:00 to 7 :00 a.m. hour.
A couple of questions arise: Is there a noisier daytime hour where the
daytime standards are exceeded ?, What are the noise levels at the third
floor level of the proposed building?
These questions are important if one is to minimize any architectural
changes to the proposed project. With the present information, the project
can go forward under the noise standards Subp. 3 Exceptions if:
1
products and services for the control and measurement of noise
"1) the building
interior sound level
2) the building
3) the building
outdoor activities."
Stipulation 1 is easily met with acoustically rated windows.
Stipulation 2 is self explanatory.
Stipulation 3 is the hardest to achieve for the present plans — with the
outdoor pool and the balconies facing the highways presenting the dilemma.
If the answers to'the above two questions prove that the daytime standards
are not exceed, including at the third floor level, this requirement would
not be valid.
Therefore, a decision is needed from you. Can the project proceed within
the above stipulations? or, Should further tests be conducted to answer the
above questions?
Si erely,
N RTTHERN SOUND,
cc: Randall C. Hedlund
is constructed in such a way that the exterior to
attenuation is at least 30 dB(A); and
has year -round climate control; and
has no areas or accommodations that are intended for
2