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<br />,Ma.r, 18. 1997 12:56PM
<br />
<br />BRAUN !NTERTEC CORP
<br />
<br />No, 3987 P. 9/13
<br />Minnesota Pollution Control Agency
<br />Project No. CMXX-97-0142
<br />March 18, 1997
<br />Page 6
<br />
<br />Table 6
<br />
<br />.......... .: ....... -1,.... ......'.... I. ". ." ,.., ...... .. ,... .., .....-" ....!.. ..: .......... {" ~i:!":"~'" .........:-. ~ ., ..;>. .... ..!. I .
<br />, -..., ,. ".... - .... " '" ".'.. .. 'y .' '''''''''' <, ..... '.., , '"". ",' ." ,->"". " --. "--"<ti.";r::=}:1~..:.:.&.-=2t[ ~ "1:."'" . ..,'. -",'
<br />?~!::,j:'(V\;\:,::\r:~; ~~~;~\:?:X<'::~i~<:0~:~?:;;~~-;!~~ ~:f'i;:,/::~'.;:~;r~':.r::~:~,:;?,,+::;'\::i~:Y~ ;:~~S{;; ~~~' ~ ~~~ ,.,' .~'.~~~
<br />..""....',,-x;.. ,...".~'~,.".,~. "')" ~~,.._~~)',., "~'~';'~'5~.:;p,.~,.,.,t>:. ;>'!'" ,~
<br />..:..~:.. :..~~'":~~~~:.~.~~. .~;~: ....:~_;...:.... ~::.~:,a~t' :: ~~~.:.....:. ~~~. ~~~:~~ ;~. ,,', .....:-... :-..~<<
<br />:--'~ ,..,~ *~.~~. ~."'...~.;.~" :~" (:>,,~ ';~~~"~::.i:G.iii-~.:;;..,,, <' '~>r~;:~~:'~;' .,~. d':
<br />:.~<.. .......... . J ~::~t..:c.~~~ ': I . .:.~~~~:..(. ;~:.:;:::"?' ~: I~~~...~~r:~;j;;::~~~:?~~^~ .i~..... ; ~~~ .
<br />...~~ ~: ......... ...~ .... .......... ...:1' :v...... ..... ..y......:......:-.;- '<~" ..._....-:?.....~. ..... ...~. . .'tiY~h
<br />
<br />1
<br />
<br />64.0
<br />
<br />58.1
<br />
<br />1.0/1.0
<br />
<br />4.0/-1.0
<br />
<br />As the results in the above table indicate, the PM peak values assumed in the noise model
<br />were very close to the collected ambient noise YaIues.
<br />
<br />The ambient noise values suggest that existing background noise levels are currently close to
<br />Minnesota's Daytime Standards and may exceed Minnesota's Nighttime Standards for noise.
<br />The dominant sources of existing noise are traffic on Interstate 3SW and Cleveland Avenue.
<br />The Centre Pointe Business Development, as shown in the noise model presented in Ryan's
<br />ISP application, may increase existing noise levels at some. receptors, but only insignificant1y~
<br />ie., a predicted increase of 1.S dB(A). Such an increase is expected to be imperceptible.
<br />Variations of three decibels or less in noise generated by such sources as highways are
<br />regarded as undetectable to the average human under a well-accepted principle of acoustics.
<br />In addition, unlike commuter traffic patterns on Interstate 3SW, the traffic generated by
<br />Centre Pointe (an office. hotel. restaurant, and office/warehouse development) is not expected
<br />to be a factor before 7:00 a.m. Moreover, landscaping and other barriers associated with the
<br />Centre Pointe development will help buffer residential receptors from noise generated by
<br />traffic on Interstate 3SW. which is the dominant noise source during the morning hours, when
<br />the predicted and existing exceedances from Minnesota noise standards are expected to be tbe
<br />greatest. Federal noise standards applicable to federal highways travelling through residential
<br />areas allow noise levels of up to 70 dB(A) before noise abatement may be necessary. There
<br />are no violations of the federal noise standard. Even if the federal highway did violate the
<br />federal noise standard, neither Ryan nor the City ofRos~ille would be responsible for abating
<br />that noise source.
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