HomeMy WebLinkAbout#5639-variances/CUP-2007 , . , M
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Doc No 4500718 05/28/2008 09:00 AM
Certified filed and or recorded on above date:
Office of the Registrar o#Titles
Hennepin County, Minnesota
Michael H. Cunniff, Registrar of Titles
TranslD 406915 Deputy 59
New cert Cert Fees
1195426 $1.50 AF
1214423 $10.50 STATEFEE
$54.00 TDOCFEE
$0.00 TSUR
$66.00 Total
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A RESOLUTION GRANTING VARIANCES
TO MUNICIPAL ZONING CODE
SECTION 78-1288 AND A CONDITIONAL
USE PERMIT PURSUANT TO MUNICIPAL ZONING
CODE SECTION 78-1286
FILE NO. 07-3284
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STATE OF MINNESOTA )
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COUNTY OF HENNEPIN )
The undersigned,being duly qualified and appointed City Clerk of the City of
Orono, Minnesota, certifies that I compared the foregoing resolution adopted at the
meeting of the Orono City Council on July 9,2007,with the original thereof on file in my
office, and the same is a correct transcription thereof.
WITNESS my hand officially as such City Clerk and the Corporate seal of the
' ,City this 18th �day of Julv , 2007. �
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CITY of ORONO
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��� �G~' RESOLUTION OF TI�E�I�Y�COUNCIL
�'k'E8�rI04 NO. � 7
A RESOLUTION GRANTING VARIANCES
TO MUNICIPAL ZONING CODE
SECTION 78-1288 AND A CONDITIONAL
USE PERMIT PURSUANT TO MUNICIPAL ZONING
CODE SECTION 78-1286
FILE NO. 07-3284
WHEREAS, Thomas W. Ritchie and Kristen Ritchie, husband and wife
(hereinafter "the applicants") are the owners of the property located at 2507 Kelly Avenue,
within the City of Orono (hereinafter the"City") and legally described as follows:
Lot 3, Block 1, and Outlot A, Navarre Cove, Hennepin County, Minnesota
(hereinafter the"property"); and
WHEREAS, the applicants have made application to the City of Orono for a
conditional use pernut pursuant to Orono Municipal Zoning Code Section 78-1286 to allow
gading within 75' of the OHWL in order to create a rain garden to manage the on site surface
water drainage; and
WHEREAS, the applicants have made application to the City of Orono for a
variance to Orono Municipal Zoning Code Section 78-1288 to allow 28.5% hardcover within the
75' -250' zone where 25% is normally allowed and 30% currently exists in order to construct an
in-gound pooL
NOW, THEREFORE BE IT RESOLVED by the City Council of Orono,
Minnesota:
FINDINGS
1. This application was reviewed as Zoning File 07-3284.
2. The property is located in the LR- 1 B Residential Zoning District which requires
a minimum lot area of 1.0 acre and a minimum lot width of 140'.
Page 1 of 5
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CITY of ORONO
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RESOLUTION OF THE CITY COUNCIL
`�xEsHo4 No. 5 6 3 9
3. The Planning Commission reviewed this application at a public hearing held on
April 16, 2007 and recommended approval of variances based on the following
findings:
a. The property contains 44,670 s.f. (1.0 acre) in area and has 150' in width.
b. A new home was constructed on the property in 2001 and the building permit
plans reflect a conforming 75' —250' hardcover level of 25%. The applicants
are the current owners and purchased the property in 2006. At the time of
purchase the property contained illegal, non-conforming hardcover within 75-
250' and 250' -500' zones.
c. The hardcover variances as requested will result in a net reduction from the
existing non-conforming levels. The 250'-500' zone will be reduced from a
nonconforming level to a level below that which is allowed. The proposed
residence meets the structural lot coverage limitation of 15%.
d. The proposed pool complies with all LR-1B setback requirements.
e. The applicants are proposing to construct a rain garden and plant a 10' wide
native vegetative buffer along the lakeshore in order to alleviate some of the
surface water drainage issues as a result of the excess site hardcover.
4. The City Council has considered this application including the findings and
recommendation of the Planning Commission, reports by City staff, comments by
the applicants and the public, and the effect of the proposed variance on the
health, safety and welfare of the community.
5. The City Council finds that the conditions existing on this property are peculiar to
it and do not apply generally to other property in this zoning district; that granting
the variance would not adversely affect traffic conditions, light, air nor pose a fire
hazard or other danger to neighboring property; would not merely serve as a
convenience to the applicants, but is necessary to alleviate a demonstrable
hardship or difficulty; is necessary to preserve a substantial property right of the
applicants; and would be in keeping with the spirit and intent of the Zoning Code
and Comprehensive Plan of the City.
Page 2 of 5
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CITY of ORONU
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RESOLUTION OF THE CITY COUNCIL
��`�x'Es�so�`'�G No. 5 6 3 9
CONCLUSIONS, ORDER AND CONDITIONS
Based upon one or more of the above findings, the Orono City Council hereby grants a
variance to Orono Municipal Zoning Code Section 78-1288 to allow 28.5%where 30% currently
exists and 25% was previously allowed in order to construct an in-ground pool and patio as well
as a conditional use permit to allow grading within the 0-75' zone to construct a rain garden,
subject to the following conditions:
l. Council approval is based on the site plan and engineered plans submitted by the
applicants and annotated by City staff, attached to this Resolution as Exhibits A & B.
Any amendments to the site plan which aze not in conformity with City codes will require
further Planning Commission and City Council review.
2. Hardcover in the 0-75' zone shall not increase above the level of 0 s.f. or 0%. Hardcover
in the 75-250' zone shall be limited to 7,079 s.f. or 28.5% per the proposed plan and
hardcover allowance summary as depicted on Exhibit A. Applicants are advised that any
future requests to increase hardcover or change the nature of existing/approved hardcover
shall require City approval, and increases in hardcover will not likely be approved
without concurrent reduction in existing hardcover.
3. Applicants shall remove all plastic or fabric liner material from the decorative landscape
beds on the property to ensure their permeability as non-hardcover surfaces.
4. Required removals of all structure and hardcover to be removed shall be completed prior
to the footing inspection for the proposed pool.
5. Submittal and approval of an as-built grading plan verifying compliance with engineering
and zoning approvals is required prior to the final inspection.
6. Authorities granted by this resolution run with the property not with the applicants, but
are permissive only and must be exercised by obtaining a building permit for the new
construction within one year of the date of Council approval, or the variance will expire
on that date (July 9,2008).
7. Violation of or non-compliance with any of the terms and conditions of this resolution
shall constitute a violation of the zoning code, shall automatically terminate any authority
granted herein, and shall be punishable as a misdemeanor.
Page 3 of 5
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CITY of ORONO
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��� �G~' RESOLUTION OF T� CITY�OUNCIL
`�kEsH�4 NO. 6 3
8. The undersigned applicants have read, understand and hereby agree to the terms of this
resolution and on behalf of the applicants and the applicants' heirs, successors and
assigns, hereby agree to the recording of this resolution in the chain of title of the
property.
Adopted by the Orono City Council on the 9th day of July, 2007.
ATTEST:
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Lin a S. Vee, City Clerk J es M. White, Mayor
P p -ty Owner(s)
Page4of5
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CITY of URONO
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RESOLUTION OF THE CITY COUNCIL
`�kE3TrI�4 NO. 5 6 3 9
STATE OF MINNESOTA
COUNTY OF HENNEPIN
This instrument was acknowledged before me this�day of /� , 2007 by
Thomas W. Ritchie, husband of Kristen Ritchie.
BARBARA G.SILUS �C+��4�Pj L��c
NOTARY PUBLIC-MINNESOTA NOtB.I'y PUbI1C
` ;.,,;-. My Commi9sion Expires Jan.31,2008
STATE OF MINNESOTA
COUNTY OF HENNEPIN
This instrument was acknowledged before me this�day of , 2007 by
Kristen Ritchie,wife of Thomas W. Ritchie.
��<
BARBARA G.SILUS Notary Public
•' NOTARY PUBLIC-MINNESOTA
;,�..;' My Commission Expires Jan.31,2008
Page 5 of 5
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HENNEPIN COUNTY, MINNESOTA a�:?� �?�
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SURVEYING, ENGfNEERING A(VD LAND PLANNfNG
445 N. WILLOW DRIVE
LONG LAKE, MfNNESOTA 55356
952-473-4141
F�X: 952-473-4435 5 6 3 �
T'HO1�LqS & KRISTEN RITCHIE
PER1�iEABILITY ANALYSIS NEAR PROPOSEDGRASSPAVE DRNEWAY AREA
JLTIE 22, 2007
TEST HOLE NO. 1
T'IME MEAS. DROP PERC. 2ATE
10:�Q > >/8„
11:20 6 5/8" 1" 30 MPI
I 1:�0 7 1/2" 7/8" 34.3 MPI
12:20 8 3/8" 7/8" 34.3 MPI
34.3 Min. per inch= 1.7� inches per hour
TEST HOLE NO. 2
TIME MEAS. DROP PERC. RATE
10:51 6 3/8"
11:21 7" 5/8" 48 MPI
11:�1 7 1/2" 1/2" 60.0 MPI
12:21 8" t/2" 60.0 MPI
60Min. per inch= 1 inch per hour
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RAIN GARDEN WORKSHEET 5 6 3 g
I)Siape: 1�
Height of string('in inches)
Distance between stakes(m�nches) z 104 �/a
2)Rain garden depth: 2)
From Chart on page 5 y �,
3)Home footprint: 3)
Length ofhouse x width ofhouse sq:ft.
4)1�iumber of downspouts: 4)
Total number of downspauts on home
S�Roof area draining to garden?�At� ��PFq vioN�' S�
(Line 3=Line 4) x number of downspouts 'r'�E A 3 a�p sq.ft.
directed to the rain garden
�Lawn area(if more than 30 ft from downspout): 6)
Length of upluIl lawn azea x width of uphill lawn area 7 2 p� sq,ft.
"n Total drainage area: '�
Line 5+Iine 6 /o� 2 a o sq.ft.
8)Soil type: g)
Enter sandy,silty or clayey from resutts on page 7 � �a Y��
9)Rain garden size factor: 9)
Results&om ta.ble 1 or table 2 an page 8 .� �
10)Rain garden size: Ip)
Line 7 X Line 9 f� � d sq,ft.
Lines 2 and 10 give you the dimensions of your rain garden. This is based on capturing 100%of
the cunoff. If you do not wish to build a rain garden of this size,a smaller rain garden will stiIl help
control runoffand filter pollutants.
Rafn CardcK.Hanrral jor 9omeownen 1 B
. 5639
4.6 Preparation:
(Ensure that sub-base materia/s are structurally adequate to receive designed base
course, wearing course, and designed/oads. Ensure that grading and sorl porosity of the
sub-base wil/provide adequate subsurface drainage.)
A. Place base course materia! over existing surface, in lifts not to exceed 150 mm (6"�,
compacting each lift separate(y to 92% minimum-95% maximum Modified Proctor. Leave
1"to 1.25" for Grasspave2 unif and sand or sad for Final Grade. •
B. Base course depths - 6" (minimum) deep; 3" of#57 stone , under a mixture of 1" of
washed #89 (318" max) and 2" of clean, compactabfe, well �iraining fill sand compacted
with a motorized plate tamper or a riding roller compactor to 92% Modified P�octor. Base
placed over exist'rng su�face. This creates an ideal surface for Grasspave2. Stone to
sand ratio should be between 65/35 and 75/25.
- „ 5639�
!continued from page 7) ensure that the root 3ystem is welI established.Seeding allows
provides for;ood drainage at the surface and makes the firelane or total customization of plant selection and eliminates possible con-
parking area not onIy sa.fer but more durable.Do a site inapection tamination of the root zone&om clay based or high peat content
when the ba�e is installed to ensure the depths aze accurate and sod,both problems with high use areas.
drainage is effec�ve.
92%Root Area and 100°/a 6rass Coverage
Base Course Desiqn Our installations are hard to find because they are invisible!
Calculating the depth and composition of materiaIs for the base With so little plas�ic near the crown of the grass, the blades of
course incorporates the same design criteria as for other pavements: grass are aot smashed by product. Roat development is not inter-
• load bearing capacity of native(or filli subsoil rupted from spreading laterally.The rings are sttong and rigid,
• plasticity or impact of moisiure on keeping grass root systems protected
strength and longevity from harm.The roats grow directly
• &ost heave potential �� downward aad deeply into the sandy
• traffic load, frequency and�or duration. , � �
, ' c�����,� .� gravel base course. Grass pave2 b y
�� ��y `�� ` Invisible Structures is,by faz,the best
+r ' � � ���. i�s
n��w}1"tl�y^Sd�.�,� .,p�l 1/•'
Sample Base Course Depths �; , �;}�4 y�; �� � ,��
�'",�/.,s�i4 r .k N„ .{. -r -+,�a. �i Passible"Iivin�'paving surface
�oµ r f't r ti , �
P l e a s e c o n s u l t w i t h a s o i l s e n g i n e e r S�. � r•�t�� : � desi ed b a landsca e architect.
.'�t�� ,��,�. � :�
�:�• r �. ...a;;;r;�r:v:;.,.,� :.{:;� � Y P
for site-specific base requirements. „a��' " ��v;�
� Generall , ����
y the depth that is used under �`'{`' Grasspave2 Uniqueness
asphalt will be the reuuirement under • Large roils for fast installatian — 10
GrassDay�2. Goif carts and pedestrian to 225 mZ
traffic may require aothing over sandy DupantCenw,lrvbrS,fA—Frred�pmbnmtt�ngof • 92°lo root area for best grass grawth
gravel soils,and just 2"to 4"(5-10 cm) 6rasspavezwlthsan�B!ledringstadetermioestabiUryof • Strong rigid rings that conform to
over very weak soils.Cars usually need oatr(ggers when(adaerwar ezcmded Bduw;F�nione undulating terrain with
4"to 8"(10-20 cm). Buses,trucks,and fire f�ON'�►1�Q�������narr�edth�/anduapingand Q�ble grid between rings
trucks can easily require 8"to 12"(20-30 softtn�theappmronaofthls bullAing. • 100�o recycled post-consumer plastic
cm)or more.The use of geotextiles, , g �
q grow — polymer,fertiIizer,soil
though not required,below the base will amendment provided &ee
prevent integration with subsoils and is :,� � • Rolls can be cut and shaped with
strongly advised in areas of clay or silt '�;: '
;.�I;�;;,' Pruning shears
soils and &�ost heave. _:,;�;
CSI Grants Spedfiwtion Number
Fil(ing Grasspave2 with Topsoi! on9sPoroasPavin9- Recognition by CSI
!S Utiwis2 has helped establish Iegitimacy to the
Remember that we are building a road- porous(grass and gravel)paving indus-
way with grass as the surface.hlaintaining poroaity for air and tries.Now we can aIl agree on 02795!As designers expand their
water movement is very impoxtant.�Vhen organic,clay or silt use aad acceptance of porous paving,the industry will grow.
particles are in the rings,compaction can take place within ttre
small cells, defeating the structure, and restricting accesa by air Creativity With Hard Surface Pavers
and water to roots. Growing grass in 3and over a sandy gravel Ideas include:Cambine GrasspaveZ with flush paths,pads or mark•
road base is more difficult to get established, but borticulturally ers of concrete in a frelane fQr pedestrian traffic,desi;n elements
and atructurally it works!If rufi�should appear in a finished ar deIineatioa;use brick pathways through the grass;fill the rings
installation,topsoil haa been used either under the rings or within ��other plant materials such as daisies and ground cocers;lay
ihe rings,contrary to our installation instruc�ions. strips of eoncrete to define parldng area3,eapecially handicapped
parking;checkerboards of grass and pavers or other patterns to
Seeding GrasspaveZ Is Popular be e�joyed�om high-rise offices;design of compaay Iogos in the
In California and other temperate climate zoaes many of our pazking lots or firelanes with polymer-bound colored stone;nanow
instaIlations are seeded. Waiting for a period of two mowings will residential streets with guest parking on grass shoulders.
so cM (�8.�^) SPEC1FiCAT10N5 5 6 3 9
16.7 CM(6.6") 25 CM(9.8") UNtT SIZE-5Q CM X 50 CM X 2.5 CM
(20"X 20"X 1")
AVAILABLF NV 9 STANOAR�ROLL SIZES
I UPifT WEIGHT-S 10 GRAMS(1 B dZ.)
� OR 2.0 KG(4.5 RQUNDS)
STRENGTH-402 KG/CM �57Z0 PSq
COLOR-BLACK(STANDARD)
RESIN-HOPE(WfTH SOME POST-CONSUMER
RECYCLED COIYFENT)
Q��
6RASSPAVE2 SQUARES
AQJACENT GRASSPAVE2 SQUARES
I ;
� �
�
I �
�
�
� � SEE ENLARGEMENT BELOW
{ �
� 8.3CM(3.3") �
� HYDROGROW MDC BELOW RING
I 2.3 CM(0.9") .---�;, $(�pp�D FREE BY MANUFACTURER
+ 6 CAA(2.4") f� � �,
i � '� RINGS FILLED WITH CONCRETE SANQ(CLEAN,SHARP SAND)
�
� �
. rs+ • � n a • > > ,�a
�';�j •., }��o���� •�'� '� � �'^ -COMPACFED SANDY GRAVEL ROAD BASE
�" � 95%MOOIFfED PROCTOR DENStTY
-,�o� �?� � _ � � R tQ°��i `' p_�� g � -6 INpiES TO 12 WCHES
`�-� ' '^�D� (DEPTH OF BASE COURSE TO BE DETERMINED
7` BY ON-SfTE ENGMEER)
C I(I-I I I I i�I� I I I I I I I i ,�I I I I I- COMPACTED SUBGRADE,
���_►�►� _�iii _►��i
.. �
TOP OF GRASS ROOT MASS 6 MM
(1/4"}ABOVE TOP OF RING
GRASSPAVEZ ATTACH VY1TH
} SNAP-FCf FAS7ENER5
ROOT MASS TO FILL
�� '- � . GRASSPAVE2
�� ~ � �;��
COMPACTED SANDY GRAVEL C8 /JtJC/�('j)
FNI ARrFMFIVT B�E COURSE
NOTE:GRASS/PUNT TYPES SNALL BE SPECIflED BY A LANDSGPE AItCF4TECT OR
LANDSCAPE DESIGNER.
TYPICAL GRASSPAVE2 DETAIL
,
CHOOSE THIS PROOUCT WR REWFORaNG GRAS$WEqpW(,SURFACES 1 OF 1
Hor r0 Sva.E I 600 Jaeksan St.Sca 3 i 0
Imisi6la GOLDEN,COI.ORADO BoaOt
800-233-t St 0 OR 303-233-8383
$WCtureS,InC. FAX:B00-Z33-1522 OR 303-233-8282
cvoer.DwG
www.inHtibla structura.ean
rev.t o/os
• r ar�c v vi i
fram buckets mounted on tractors, which then exit the site by driving over rings already filled w-ith 5 6 3 9
sand. The sand is then spread laterally from the pile using flat bottomed shovels and/or wide "asphalt
rakes" to fill the rings. A stiff bristled broom should be used for finai "finishing" of the saad. The sand
must be "campacted" by using water from hose, irrigation heads, or rainfall, with the finish grade no Iess
than the top of rings and no more than 6 mm (0.2�") above top of rings.
3.04 Installation of Grass
(Choose one paragraph below to meet grass installation method desired.)
�A (Preferred method) Hydroseeding/hydro-mulching - A combination of water, seed and fertilizer
are homogeneously mixed in a purpose-built,truck-mounted tank. The seed mixture is sprayed onto the
site at rates shown on plans and per hydroseeding manufacturer's recommendations. Coverage must be
uniform and complete. Following germination of the seed, areas Iacking germination Iazger than 20 cm
x 20 cm (8" x 8"} must be reseeded iminediateiy. Seeded azeas must be fertilized and kept moist during
development of the tnrf plants.
B. Install thin sod directly over sand filled cings, filled no higher than the top of the rings. Sod
strips should be glaced with very tight jaints. Sodded areas must be fertilized and kept moist during root
establishment(minimum of 3 weeks). Sodded areas must be protected from any traffic, other than
emergency veiucles, for a period of 3 to 4 weeks, or until the root system has penetrated and established
well below the Grasspave2 units.
C. Instail grass seed at rates per grass type. A Iight"dusting" of commercial topsoil mix, not ta
exceed 1/2" (25 mm} can be placed above the rings and seed mix to aid germination ra.tes. Seeded areas
must be fertilized a.nd kept moist during development of the turf plants.
3.05 Protection
(Choose one para.graph below to match grass instailation method.)
A. Seeded areas must be protected frorn any tr�c, other than emergency vehicies, for a period of 4
to 6 weeks, or until the grass is mature to l�wdle traffic.
B. Sodded areas must be protected from any tr�c, other than emergency vehicIes, for a period of 3
to 4 weeks, or until the root system has penetrated below the Grasspave2 units.
3.06 Cleaning
A. Remove and reglace segments of Crrasspave2 units where three or more adjacent rings aze broken
or damaged, reinstatling as specified, so no evidence of replacement is appazent.
B. Perform cleaning during the installarion of work and upon completion of the work. Remove aIl
escess materiais, debris, and equipment from site. Repair any damage to adjacent materials and surfaces
resulting from instaIlation of this work.
END OF SECTION
If you have any questions regarding this specification, please call Invisible Structures, Inc. t-800-233-
1�I0, overseas call 303-233-8383.
6/25/2007
� �
ia�c � vL i
, ,,�� � r „
�I. Grasspave2 Sign: A sign to ideatify the presence of Grasspave2 paving, stating that special .
maintenance is required, with the Nlanufacturer's phone number, and made of durable materials for 5 6 3 9
outdoor exposure shail be provided and installed.
I. Firelane Si,pnage & Deiineation: Firelanes must be identified regarding their entrance and physical
tocation with the placement of signs, gates, curbs, bollards, etc. Specific signage wording and other
details must be coordinated with and approved by Iocal fue authorities.
PART 3 - EXECUTION
3.01 Iaspectioe
(It is recommended that Fire Department inspectors be scheduled to inspect instatlation of Grasspave2
during preparation of the subbase, installation of the base course, and installation of Grasspave2 units.
Most smaIl projects can accommodate these inspections aIl on the same da.y. Verify with Fire
Department if certificates of inspection are required.}
A. Examine subgrade and base course installed conditions. Do not start Grasspave2 installation
until unsatisfactory conditions are corrected. Check for improperly compacted trenches, debris, and
improper gradients.
B. Installation constitutes acceptance of existing conditions and responsibility for satisfactory
performance. If existing conditions are found unsatisfactory, coatact Project Manager for resotution.
3.02 Preparallon
(Ensure that subhase materials aze structura.ity adequa.te to receive designed base course, wearing course,
and c3esigned Ioads. Generally, excavation into undisturbed normal strength soils will require no
additional modification. Fill soils and otherwise structurally weak soils may require modifications, such
as geotextiles, geogrids, and/or compaction(not to exceed 90%). Ensure that grading and soil porosity
of the subbase will provide adequate subsurface drainage.}
A. Place base course material over prepared subbase to grades shown on plans, in Iifts not to exceed
150 mm(6"), compacting each lift separately to 95% Modified Proctor. Leave minimum 25 mm(1") to
35 mm(1.5") for Grasspave2 unit and sandlsod fill to Final Grade.
B. Spread all Hydrogrow mi:c provided (spreader rate =4.53 kg per 100 m2 (10 lbs per 1076 ft2)
evenly over the surface of the base course with a hand-held, or wheeled,rotary spreader. The
Hydrogrow mix should be placed 'unmediately before instailing the Grasspave2 units to assure that the
polymer does not become wet and expanded wtten instailing the units.
3.03 Installation of Grasspave2 Units
A. Install the Grasspave2 units by piacing un'tts with rings facing up, and using pegs and holes
provided to mainta.in proper spacing and interlock the units. Units can be easily shaped with pruning
shears or knife. Units placed on curves and slopes shall be anchored to the base course, using 16d
Common nails with fender washer, as required to secure units in place. Tops of rings shall be between 6
mm to 13 mm(0.2�" to 0.5") below the surface of ad,jacent hard-surface pavements.
B. Install sand in rings as they are Iaid in sections by "backdumping" directly from a dump truck, or
6/25/2007
• t ar,�c T vi r
� �
� "� 7, .
(Ccushed shell and limerock alone can set up like concrete without sand added.) � 6 3 9
B. Hydrogrow Mix: A mixture made &om several comm.ercial products including: 1) cross-linked
polyacrylimide (<0.1%)po(ymer, which is non-to�cic and neutral in pH, and will absorb 150 to 350 times
its weight in water &om most tap sources; 2} ZeoPro zeolite mineral, amended with small amounts of
starter fertilizers, &om Zeoponix, Inc.; 3} Isolite porous ceramic, designed to hold lazge amaunts af
water without physicaI degrada.tion ar change of size of particle, from Sumitomo Group; 4) and
aggromolated Humate, a natura! source of nutrients and micronutrients, &om Tri-C Enterprises.
C. Grasspave2 Grass Paving Units: Lightweight injection-molded plastic units O.Sx0.5x0.02� m
(20"x20"xI" high, 2.7 ft2 each) with hotlow rings rising from a strong open grid allowing maximum
grass root penetratioa and development. The pIastic shall be 1 QO%post-consumer recycied plastic
resins, predominately HDPE, with minimum 3%carbon biack concentrate added for W protection.
Loading capability is equal to 402 kg/cm2 (�700 psi)when filied with sand, over an appropriate
depth of roadbase. Standard color is black. Unit weight= 510 g (18 oz), volume= 8% solid. Units
may atso be shipped in pre-assembled into rolls that vary from 10 square meters (I08 s fl to 125 squa.re
meters (I34� sfl.
D. Sand: Obtain clean sharp sand(washed concrete sand)to fill the 2� mm (one irrch) tugh rings
and spaces between the rings when seeding or using 13 rnm (half inch) thick sod(soil thickness).
E. Grass: Use species resistant to weaz by traffic generally a Blue/Rye/Fescue mix used for athletic
fiefds in northern climates,and Zoysia, Fescue, or Bermuda types in southem ciimates.
(Check with local sod and seed suppliers for preferred mixtures.)
(Dedicated firelanes can use same grass species used on surrounding turf.)
- (Pazking applications require greatest wear-resistant species possible, generally available only by
seed or sprigging.)
(Choose one of the following pazagraphs to suit projectrequirements.)
I. Sod: Use 13 mm(0.5") thick(soil thickness) rolled sod from a reputable local grower.
Species shouid be weaz resistant, free from disease, a:nd in escellent condition. Sod shall be grown in
sand or sandy loam soils only. Sod grown in soils of clay, silt, or high organic materials such as peat,
will not be accepted.
2. Seed: Use seed materials, of the preferred species for locai environmental and projected
tr�c conditions, from certified sources. Seed shall be provided in containers ciearly labeled to show
seed name, lot number,net weight, %weed seed content,and guaranteed% of purity and germination.
Pure Live Seed types and arnount shalI be as shown on plans.
F. Mulch: (Need�d only for seeding.) Shall be of wood or paper cellulose types of commerciai
mulch materials often used in conjunction with hydroseeding operations. Mulches of straw, pine
needles, etc. will not be accepta.ble because of their low moisture holding capacity.
G. Fertilizer: A commercial "starter" fertilizer, with Guaranteed AnaIysis of 17-23-6, or as
� recommended by Iocal grass supplier,for rapid germination and root development.
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' Page 3 of 7
, ��, '7, .
shipped in flat sheets that measure 1-meter(40") square.
2. Da not build on frozen work or wet, satura.ted or muddy subgrade. 5 6 3 9
E. Protect partially completed paving against damage from other construction traffic when work is
in progess, and untiI grass root system has matvred (about 3 to 4 weeks). Any barricades constructed
must still be accessible by emergency and fire equipment during and after instalIation.
F. Protect adjacent woric from damage during Grasspave2 installation.
PART 2 - PRODUCTS
2.01 Availability
A. Manufacturer: (Grasspave2, Hydrograw) Invisible Structures, Inc., 1600 Jackson Street., Suite
31Q, Golden,Colorado 80401. Call from USA and Canada.800-233-I510 toIl &ee, Internatioraal 303-
233-8383, Fax 303-233-8282.
B. Local Sales Representative:
(Contact Manufacturer)
� 2.02 Materials
A. Base Course: Sandy gravel material from local sources commonly used for road base
construction, passing the following sieve analysis.
% Passine Sieve Size
100 3/4"
85 3/8"
60 #4.
30 #40
< 3 #200
l. Sources of the ma.terial can include either "pit run" or "crusher run." Crusher run material
wiil genera.11y require sharp sand to be added to mixture (33%by volume) to ensure long term porosity.
If there is difficuity in finding local sources to meet this sieve analysis, and altemative mixture can be
� created by mixing 2/3 crushed drainage rock (0.75" dia) with 1/3 concrete or river sand.
2. Selected materials should be aeazly neutral in pH (range from 6.5 to 7.2) to provide adequate
root zone development for turf.
3. Altemative materials such as crushed shell,limerock, aad/or crushed lava may be considered
for base course use, provided they are mixed with sharp sand(33%), and brought to proper compaction.
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� �] T„
B. Related V1%ork:
l. Subgrade prepara.tion under Section 02200 Earthwork. 5 6 3 �
2. Subsurface drainage materials- Section 027I0 Subsurface Drainage, when needed
3. Irrigation installation - Section 028 I O Irrigation, when needed.
1.03 Quafity Assurance
A. Foilow Section 01340 requirements.
B. Installatian: Performed only by skilled workpeople with satisfactory record of performance on
landscaping or paving projects of compazable size and quality.
1.0� Submittals
A. Submit manufacturer's product data and installation instructions.
B. Submit a 10" x 10" section of Grasspave2 material for review. Reviewed and accepted samples
will be retumed to the contractor.
C. Submit material certificates for base course and sand fill materials.
1.0� Delivery, Storage,and Handling
A. Protect Grasspave2 units from damage during delivery and store under tarp to protect from
sunlight, when time from delivery to installation exceeds one week. Keep Hydrogrow in a dark and dry
location.
1.46 Project Conditioas
A. Review installation procedures and coordinate Grasspave2 work with other work affected.
Generally, Grasspave2 is installed at the same time as project grass installation,nearIy the last site
construction activity.
B. Atl hard surface paving adjacent to Grasspave2 azeas, including cancrete walks and asphalt paving
must be completed prior to installation of Grasspave2.
C. Gradients for grass porous paving surfaces can vary fram flat to 20%, depending upon vehicle types
to use the surface. Please note that firetanes, or other emergency vehicles, wi11 generally require a
gradient that is tess than 6%. If there are any questions regarding e�sting gradients on this project,
piease contact the Project Designer, or Invisible Structures, Inc.
D. Cold weather:
I. Do not use frozen materials or materials mixed or coated with ice or frost. Be careful in
handling rolls of Grasspave2 in temperatures betow 50 degrees F, as product connectors become stiff
and can sepazate, and Che individual units will retain the rotl curl until warmed to room temperature
(aided by placement in sun for 15 to 20 minutes). If cold weather is anticipated, Grasspave2 can be
6/2�/2007
•T'EC�{1�'f�AL SPECIFICATION - Grasspave2 with 92°/a Void Space and Hydrogrow
Mixture
CSI Master Format 32 I2 43 Flexible Porous Pavement
(1997 Section 0279� Porous Pavement) ,
5639�
PART 1 - GENERAL
1.01 General Provisions
A. T11e Conditions of the Contract and a!1 Sections of Division I aze hereby made a part of this
Seetion.
1.02 Description of Work
A. Work Inciuded:
l. Provide and instaIl sandy gravei roadbase as per Geotechnical Engi.aeer's recommendations
and/or as shown on drawings, to provide adequate support for project design loads. See 2.02 �
Materials.
2. Provide Grasspave2 Paving System products including Grasspave2 units, Hydrogrow soil
polymer, and installation per the manufacturer's instructions fumished under this section.
3. Provide and instai!clean sEiarp sand to f ll the Grasspave2 tuuts, whea needed.
4. Provide and instaIl grass by using sod or hydroseeding.
6/25/2007
R�C�r�,�D
`��� Z 5 2001
. C�i'y,pF OR�N�