Salmon Run Apartments - Updates QuestionsIPM.Note
Salmon Run Apartments - Updates / Questions
Karen Bennett
Heimbigner, Chad
Karen Bennett
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Heimbigner@coffman.com
Salmon Run Apartments - Updates / Questions
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Subject: Salmon Run Apartments - Updates / Questions
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From: "Heimbigner, Chad" <Heimbigner@coffman.com>
To: <amy@sheacarrjewell.com>,
"Tami Merriman" <tamim@ci.yelm.wa.us>
Cc: <karenb@ci.yelm.wa.us>,
"Rod Butler" <butler@zeckbutler.com>,
<timberriverdev@hotmail.com>,
"Mark King" <king@zeckbutler.com>,
"Chuck Lie" <CLie@terra-associates.com>,
"Arnold, Tom" <arnold@coffman.com>,
"Matlack, Rebecca" <matlack@coffman.com>,
<cschepper@terra-associates.com>
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Subject: RE: Salmon Run - Swale / Infiltration Gallery Cross Section
Date: Mon, 1 Nov 2010 10:17:22 -0700
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From: "Tami Merriman" <tamim@ci.yelm.wa.us>
To: "Heimbigner, Chad" <Heimbigner@coffman.com>
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Heimbigner, Chad
SMTP
Heimbigner@coffman.com
Karen Bennett; Rod Butler; timberriverdev@hotmail.com; Mark King; Chuck Lie; Arnold, Tom; Matlack, Rebecca; cschepper@terra-associates.com
amy@sheacarrjewell.com; Tami Merriman
Salmon Run Apartments - Updates / Questions
Good morning Amy and Tami.
I have some updates and questions regarding the Salmon Run Apartment
project (10720 Vancil Road Southeast). Can one of you please provide me
with some input?
* In response to your initial comments, we requested the
geotechnical engineer conduct some additional testing at the subject
site. During the supplemental geotechnical explorations, groundwater
was encountered at an elevation of approximately 341.50. Test pits that
were excavated to an elevation of approximately 339.00 a year ago didn’t
have any seepage. According to the geotechnical engineer, last year at
the time of test pit excavation, the rainfall for the water year to date
was about 2.5 inches more than normal. This year during the recent
explorations, the rainfall to date is about 6 inches more than normal
for the water year. We anticipate this is contributing to the elevated
groundwater level. It appears the most feasible option for utilizing
infiltration facilities for the subject site is utilizing StormFilter
units (see attached) for treating storm water runoff, with discharge to
shallow, subsurface infiltration galleries. We would not utilize swales
for treating storm water. The galleries would be similar to those
previously proposed, with the exception of using more piping (to allow
for more temporary, subsurface storage volume), having a shallower drain
rock depth (3 foot depth for drain rock, rather than 5 feet as
previously proposed), and a shallower excavation (bottom of gallery
would be installed at elevation 344.50 or higher, allowing for 3 feet of
separation from the recently encountered groundwater). We would still
have the infiltration galleries located in the areas previously shown,
with some of the galleries also expanding into the limits of the parking
area more. The geotechnical engineer is currently conducting an
analysis to determine if the revised storm water management system we
are proposing meets the Site Suitability Criteria for the subject site?
If the geotechnical engineer determines the proposed improvements meet
the Site Suitability Criteria, will the City allow a separation of 3
feet as noted in SSC-5? Is the use of StormFilter units acceptable for
treatment of storm water prior to disposal to shallow infiltration
galleries?
* We have a question regarding the following comment from the
letter dated February 25, 2011: Site suitability Criteria 1 (SSC-1
Setback Criteria) – the infiltration facilities shall be set back at
least 20 feet downslope of a building foundation and 100 feet upslope.
Most of the proposed infiltration systems do not meet this requirement.
We understand the setback criteria are provided as guidance. Based on
an email from Tami Merriman (City of Yelm) dated November 1, 2010, we
understand the City has allowed the 20 foot setback to be reduced to 10
feet. Please let us know if our understanding is correct and 10 feet is
acceptable.
I look forward to receiving your input. Please let me know if you have
any comments or questions. Thank you. I appreciate your help.
Chad
Chad Heimbigner, P.E., LEED AP
Senior Civil Engineer
Coffman Engineers, Inc.
p 509.328.2994 | f 509.328.2999 www.coffman.com
<http://www.coffman.com/>
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Salmon Run Apartments - Updates ? Questions.EML
Karen Bennett
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amy@sheacarrjewell.com
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amy@sheacarrjewell.com
amy@sheacarrjewell.com
Tami Merriman
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Karen Bennett
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Rod Butler
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Rod Butler
Rod Butler
timberriverdev@hotmail.com
SMTP
timberriverdev@hotmail.com
timberriverdev@hotmail.com
timberriverdev@hotmail.com
Mark King
SMTP
king@zeckbutler.com
Mark King
Mark King
Chuck Lie
SMTP
CLie@terra-associates.com
Chuck Lie
Chuck Lie
Arnold, Tom
SMTP
arnold@coffman.com
Arnold, Tom
Arnold, Tom
Matlack, Rebecca
SMTP
matlack@coffman.com
Matlack, Rebecca
Matlack, Rebecca
cschepper@terra-associates.com
SMTP
cschepper@terra-associates.com
cschepper@terra-associates.com
cschepper@terra-associates.com
StormFilter 2 Cartridge Unit.pdf