HomeMy WebLinkAbout15.B.6. Approval Plans for Salt Storage Building for PW Department-Res. No. 5946
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CITY OF SHAKOPEE
Memorandum
TO: Mayor & City Council
Mark McNeill, City Administrator
FROM: Bruce Loney, Public Works Director
SUBJECT: Approval of Plans & Specifications for
Salt Storage Building for the Public Works Department
DATE: September 2, 2003
INTRODUCTION:
Attached to this memorandum is Resolution No. 5946, a resolution approving the plans and
specifications for the construction of a salt storage building for the Public Works
Department in order to advertise for bids on this project.
BACKGROUND:
On May 20, 2003, City Council approved a motion to prepare a contract with Oertel
Architects for the remodeling of the public service building and salt storage building on the
Public Works site, and authorize the appropriate City officials to execute this contract. The
contract has been completed and Oertel Architects has been working with staff to complete
the plans for the salt storage building.
Also attached is a copy of the CIP for 2003 indicating a salt storage building to house salt
for de-icing City streets at a cost of $95,000.00.
Oertel Architects has been working with the Public Works Director, Public Works
Supervisor, Street Lead, Park Lead and Lead Mechanic in discussion on the salt storage
siting and design of the salt storage building, and how much work the Public Works
Department can do to minimize the cost to the City in constructing this building. Currently,
the City does have approximately 130 tons of salt stored outside covered by a tarp, due to
the mild winter of2002-2003, and due to the City's contract on buying a minimum quantity
of salt for the year. Also, the City does have in its existing small salt storage shed 130 tons
of mixed salt with sand and clear salt stored as a result of the winter of 2002-2003. Oertel
Architects will be available to present their design on the public works site, which will be
located in the storage yard, and should not impact any future expansion for the Public
Works Department. The salt storage building being proposed is similar to the one that the
County built in Belle Plaine and is a fairly standard design and inexpensive building to
house salt.
Currently, the MPCA does not have regulations on salt storage. However, verbally they do
recommend covering the salt. Attached is a page from an article from the salt institute
which recommends proper storage of salt for three reasons: Economy, Availability and
Convenience. The main reason for storing salt inside is as follows:
. Prevent formation of lumpy salt that is difficult to handle with loaders and move to
spreaders.
. Eliminate the possibility of contaminating streams and wells with salt runoff.
. Eliminate salt loss due to dissolving and runoff.
Although the MPCA does not require the City to store salt in a building, many Cities,
Counties, and States have constructed facilities to store salt. Previously, many salt storage
design buildings were of a dome shape or other high structure shape with a wood frame or
concrete construction and were very expensive. The new style for a salt storage building is
made up of a fabric and posts at 8 foot intervals commonly referred to as a Cover-All
Building System and is much more cost effective in storing salt and does protect the salt
from any damage or loss from precipitation.
In order to construct the building and place the existing salt, which is currently covered by
tarp into the building this year, it would be necessary to approve plans and specifications at
this time in order to advertise for bids. It is possible that with the assistance of the Public
Works Department, that the building could be constructed and salt stored within two months
after a contract has been awarded.
ALTERNATIVES:
1. Adopt Resolution No. 5946, a resolution approving plans and specifications and
ordering advertisement for bids for the construction of a salt storage building on the
Public Works site, Project No. 2003-8.
2. Deny Resolution No. 5946.
3. Table for additional information.
RECOMMENDATION:
Staff recommends Alternative No.1, in order to proceed with the construction of a salt
storage building in 2003 and prior to the majority ofthe 2003-2004 winter season.
ACTION REQUESTED:
Offer Resolution No. 5946, A Resolution Approving Plans and Specifications and Ordering
Advertisement for Bids for the Construction of a Salt Storage Building on the Public Works
Site, Project No. 2003-8, and move its adoption.
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Public Works D" ector
BUpmp
MEM5946
RESOLUTION NO. 5946
A Resolution Approving Plans And Specifications
And Ordering Advertisement For Bids
For The Construction Of A Salt Storage Building
Project No. 2003-8
WHEREAS, pursuant to a motion executing a contract with Oertel Architects adopted by
City Council on May 20, 2003, Bruce Loney, Public Works Director has prepared plans and
specifications for the construction of a salt storage building on the Public Works site and all
appurtenant work and has presented such plans and specifications to the Council for approval.
NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE
CITY OF SHAKOPEE, MINNESOTA:
1. Such plans and specifications, a copy of which is on file and of record in the Office
of the City Engineer, are hereby approved.
2. The City Clerk shall prepare and cause to be inserted in the official paper and in the
Construction Bulletin an advertisement for bids upon the making of such improvement under such
approved plans and specifications. The Advertisement for Bids shall be published as required by
law.
Adopted in session of the City Council of the City of Shakopee,
Minnesota, held this day of ,2003.
Mayor ofthe City of Shakopee
ATTEST:
City Clerk
Proper Salt Storage
There are three reasons why a public works agency should construct and properly operate salt storage facilities:
economy, availability and convenience.
Salt is the most economical deicing material available. Initial cost is low. Handling and storage are simple.
Spreading is fast and easy.
Salt never loses its capability to deice no matter how long it is stored. Rock salt is already between 210 and 320
million years old when it is mined, and carrying over salt on storage piles to the next year or even longer does
nothing to diminish its melting power. There is no loss to moisture from the air if salt is stored properly. Salt does
not absorb moisture until the humidity reaches 75 percent. Any absorbed moisture will evaporate when the humidity
falls below 75 percent. Any resulting thin crust on the surface of the salt is easily broken up.
Salt, however, can be lost to precipitation. Storage piles, whether large or small, should never be left exposed to rain
or snow. A permanent under-roof storage facility is best for protecting salt. If this is not possible, then outside piles
should be built on impermeable bituminous pads and covered with one of the many types of temporary waterproof
materials, such as tarpaulins and polyethylene.
Salt storage piles also must be covered in order to prevent possible detrimental effects to the environment. Runoff
should be properly controlled.
WHY STORE SALT INSIDE?
Covered storage facilities may seem expensive, but the benefits far outweigh the costs in the long run. Salt
should be stored in a roofed enclosure in order to:
. Prevent formation of lumpy salt that is difficult to handle with loaders and to move through spreaders,
. Eliminate the possibility of contaminating streams and wells with salt runoff,
. Eliminate salt loss through dissolving and runoff.
ANTI-CAKING ADDITIVES
It's important to keep salt free flowing. To do this, salt producers add anticaking agents. However, ifleft
exposed to precipitation, anticaking agents can be washed from the outer layer of salt.
HOW MUCH SALT IS NEEDED?
Adequate storage ensures enough salt to fight winter storms, without the problem of arranging emergency
shipments throughout the winter months.
There should be storage room for an estimated average winter's salt requirements. Suppliers do their best to
maintain deliveries from strategically located stockpiles. However, replenishment of agency salt storage piles
becomes more difficult during heavy demand periods. Therefore, it is wise to take early delivery of winter
supplies and store the salt until it is needed.
Estimating future salt requirements is tough, but the following guidelines can help.
. Don't order too little on the hope that you will have a mild winter.
. Use the average over the last 5 years to arrive at a reasonable amount to order.
. Be sure to take into account new mileage added to your road or street system.
.. Take into account improvements in winter maintenance, such as going to straight salt or adding more
salt routes. When anticipating needs, make realistic estimates, but be sure to consider the possibility of
unseasonable or prolonged cold spells, with more snow or ice than usual. All of these conditions, often
unpredictable, can affect your use of salt.
ORDER SALT EARLY
Order salt by mid summer for summer and fall delivery. Then there is reasonable assurance of getting the
material well ahead of winter. Transport problems often become complicated once winter begins and the
demand for salt increases. For one thing, numerous orders for salt all at one time place increased demands on
the shippers and haulers that deliver salt from production points to stockpile sites and to users.
For another thing, adverse winter weather can slow shipments that arrive by truck and rail. Much of the salt is
shipped at least part of the way to the user by water, and freezeups can halt water shipments.
Early ordering and stockpiling of deicing salt ensures a ready supply, with the material delivered during good
weather. Plan your salt program early.
SELECT THE RIGHT SITE
The most critical step in providing good storage is selecting the storage site. S-A-L-T-E-D is the key word in
picking the right spot:
. Safety
. Accessibility
. Legality
. Tidiness
. Economy
. Drainage
Safety means good visibility for operators, no direct access onto heavily-traveled roads, warning signs at
entrances, security fencing, and safety for the surrounding environment.
Accessability means easy access for equipment and delivery trucks, big enough for front-end loaders to
maneuver, roomfor a 20-foot extension of the pad in front of storage buildings, and doors large enough to
accommodate equipment.
Legality means complying with local zoning ordinances and any required discharge permits.
Tidiness means making buildings as attractive as possible, keeping buildings well maintained, good
housekeeping around the storage site, and screening the storage site with fencing or plantings.
Economics means permanent covered storage and locating the storage site to avoid long distance hauling.
Drainage means good drainage away from the stockpile, sloping bituminous pads (114 inch per foot downward
from the center), containing runoff, installing retention curbs if necessary, and dispossing of salt brine in
conformance with applicable federal and state regulations and local ordinances.
HOW MUCH SPACE WILL IT OCCUpy
There is a limit to how much salt can be stored in a given area. From certain facts about salt's physical
characteristics, we can determine in advance how much space a known amount will occupy.
When deicing salt falls freely into a pile, it forms a cone with sides that slope at an angle of 32 degrees, salt's
natural angle of repose. The density of deicing salt ranges from 72 pounds per cubic foot loose to 84 pounds
compacted. When calculating storage space requirements, use the figure 80 pounds per cubic foot or 2160
pounds per cubic yard. Thus, a ton of salt would require 25 cubic feet of storage space.
PUT IT ON A PAD
Permanent, covered storage is recommended, but some agencies still store salt in outdoor stockpiles on
bituminous or concrete pads. This low-cost method provides maximum storage space and easy access. Whether
stored inside or outside, salt must be on an impermeable pad, or base.
The pad site should be located away from wells, reservoirs and groundwater sources and situated so that if any
drainage inadvertently leaves the storage area it will not affect them.
Concrete pads should be constructed of air-entrained concrete. The pad should be treated with a good quality
concrete sealant to prevent spalling.
Slope pads to allow surface water to drain away. Let local conditions control the direction of slope to avoid
excessive grading. Minimum slope is two percent. Slopes steeper than five percent may make front-end loaders
unstable.
For good drainage, install ditches, pipes and tile where necessary. In some cases, it may be necessary to chaIll1el
water to a collection point, preferably a specially designed sump area.
OUTDOOR COVER
If outdoor storage is used, the salt must be properly covered. Salt stored in bins or on pads may be covered with
a suitable waterproof material. Old tires lashed together with rope or cable and placed uniformly over the
flexible cover and tied down make a suitable weighting system. Poly-cord nets are also available for tying down
covers. Be sure to weight down the base of covers to keep wind from peeling them off salt piles. Timbers,
including railroad ties, may be used for that purpose.
PUT IT UNDER ROOF
The best storage for deicing salt is the ground level storage building. There are as many types of storage
building as there are ideas. Many agencies have developed their own particular design.
Buildings may be constructed of railroad ties, pressure-treated timbers, assorted lumber, old bridge timbers and
decking, concrete blocks, corrugated sheet metal or various other materials on hand. Prefabricated buildings are
also available. Use pressure-treated posts and timbers in pole-type buildings. Make sure all hardware is
galvanized. Concrete block buildings should be waterproofed inside. In case of open ends, cover should be
supplied for exposed salt.
Areas around the building must be well lighted for safe nighttime operations. On the inside of buildings, place
lights to the side and high enough to keep from covering wiring or light fixtures with salt when the building is
full.
CONSTRUCTION TIPS
Wind and snow are enemies of storage buildings. Design storage buildings to withstand snow loading of 25
pounds or more per square foot of roof and winds of80 miles per hour.
The following design considerations should be taken into account to allow for effects of wind and snow:
. Location and Arranl!ement Use trees to help shield buildings against strong winds and snow, but
avoid constructing too close to a tree line, which could cause snow to accumulate around the building.
. Foundation and Anchoral!e Anchor buildings securely to resist the pushing and lifting forces of
wind. Generally, embed strong, pressure-treated poles four feet or more into undisturbed soil or encase
in concrete. Use closer pole spacings, heavier poles and deeper embedment for very high pole
buildings.
. Joints and Construction Practices Use large enough coated nails and plenty of them. Secure building
corners properly, use joint connector devices and fasten rafters properly at plate lines. Whole roof and
wall sections may blow off as a unit because a building literally comes apart at the seams when not
properly secured. A void skimpy knee bracing, poor location of crossties, poorly fastened joints or
framing members that are too small. Poor construction causes many building failures.
. Buildin2: Materials Don't use lumber with defects such as knots or splits. These may cause supports to
fail, especially under the weight of heavy snow. Failure of a weak member puts more load stress on
adjacent members, leading to their failure. Use enough nails of the proper type and length in
corrugated sheeting to avoid wind damage. Use 90 to 100 screw shank nails per 100 square feet of
corrugated steel roofmg. One-half to two-thirds of the nail should be embedded in the support member.
Use only exterior type plywood for sheathing, gusset plates, braces, doors and other building parts
exposed to moisture and weathering.
Many public works agencies have erected dome type structures for salt storage; Most are of wood with concrete
base, but some are concrete or thermo spheric structures. Other popular designs offer similar advantages and
some unique features such as doors at each end for easier access. Choose a design that efficiently uses interior
space, with no supporting posts or beams to get in the way. Sloping walls that accommodate the natural angle of
repose (32) of deicing salt helps minimize pressure on walls. The shape of the building and proper positioning
can lessen wind resistance. Building and bin walls must withstand pushing from front-end loaders and pressure
from stored salt.
Exhaust fumes from front-end loaders, and spreader trucks in the case of large under-roof storage, can become
obnoxious or hazardous if the storage facility is not properly ventilated. Forced ventilation may be necessary if
natural air flow proves insufficient.
FILLING THE BillLDING
The most common method of filling inside storage facilities is to dump salt directly into the building or directly
in front of it and push it inside with a front-end loader. Conveyors are sometimes used, particularly the new fast
ones. Slingers--short conveyor belts capable of throwing the salt some distance--are used by a few trucking
finns, but this is a slow method.
DELIVERY TIPS
Salt is delivered to most storage sites by truck. There are several ways that can speed completion of deliveries.
. Allow enough room for maneuvering. The average length of large trailer trucks that deliver deicing salt
is 48 feet and some are 55 feet long.
. Room for turning and backing should be at least twice the length of the longest delivery truck entering
storage yards.
. When dumping, trailers may rise 30 feet above the ground level. Allow for this when planning the size
of overhang in front of storage buildings and when locating power lines and lights.
. Help truckers fmd the spot. A hard-to-find storage site may slow salt delivery. Place signs indicating
locations of salt storage points and furnish maps for these storage points to truckers.
. Don't keep truckers waiting. If a storage facility is properly designed, a truckload of bulk salt can be
unloaded in three or four minutes. But truckers are often kept waiting.
. Shipments generally cannot be unloaded unless a delivery ticket is signed. Make sure someone is
available to sign delivery tickets or otherwise accept and authorize deliveries. Delays can be costly.
. Inspect the salt you receive. Salt is tested by suppliers for shipping weight, gradation and correct level
of anticaking additive when loaded. If additional tests are necessary, try to make them quickly, using
standardized equipment and procedures.
. The same trucks that deliver salt haul other materials. Occasionally foreign objects left in trucks get
into salt and can damage spreaders or loaders. If you find foreign objects in your salt, tell both the
trucker and the salt supplier. Only if they know of the problem can they take corrective action.
SUMMARY
Good storage of salt is extremely important. Protection of the surrounding environment and the salt itself, and
ease of handling salt, are necessary and can be ensured through proper storage.
. Salt should be stored under roof or, if in the open, properly covered.
. All salt, inside or outside, should be stored on an impermeable pad.
. Producers and users of salt should take steps to assure proper salt storage, including proper
maintenance of facilities and good housekeeping practices.
. Adequate storage capacity can minimize the need for delivery during critical storm periods and can
ensure that salt is available when needed.
Good planning is essential to good storage, and proper storage is a vital part of Sensible Salting.
For further information, you may wish to order highway salt publications from the Salt Institute. Proper storage, of
course, means complying with all applicable regulatory standards. You may want to consider federal stormwater
runoff regulations. Note our disclaimer.
Think you're doing a good job? The Salt Institute annually recognizes agencies for their "Excellence in Storage"
through an awards program.
For further information, check with storage building design-builders such as Dome Corp. of North America,
Advanced Storage Technology, Cover-All Building Systems, Bulk-Store Structures or Sprung Instant Structures or
see the State of Maine's online description of its salt (and sand) storage program, which includes descriptions of the
types of storage buildings.
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DATE ISSUED. SEPT. 2, 2003 UNDER MY DIRECT
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a. 7f1>.d
~ T.O. I'OOTING NOTE: BEDROCK EXISTING STANDARD 14'x141
a.15&.d +/- APPROXI MATEl. Y 31 BEl.OW CONCRETE PIERS, EXTEND 3' ROLL-UP DOOR CONCRETE PIERS BEYOND
ESTABLI5\.lED PAVEMENT ELEVATION. ABOVE GRADE SERVICE ACCESS DOOR FLAP
AS BASE BIOI ASSUME TI-lAT CONC. 3' JERSEY BARRIERS FOR
PIERS SET ON BEDROCK. FABRIC ATTACI-lMENT
CD EAST AND WEST ELEV. @ NORTI-l ELEVATION
111"":=1'-0" 111""==11-0"
PRE-FINtSl-lED ~'X~I lOUVER
BUILDING FABRIC
NOTE: PROVIDE APPROPRIATE
STRUCTURE TO PROVIDE
CLOSED END WI LOUVER CONCRETE PIERS BEYOND
3' I-lIGM CONCRETE JERSEY
BARRIERS AT END WALLS
@ SOUTI-l ELEVATION
1/1""=1'_0"
- PROJECT NUMBER: 03.15 I HEREBY CERTlF"Y THAT SHAKOPEE PUBLIC WORKS- SALT/SAND BUILDING
THIS DOCUMENT WAS SHEET NO.
DATE ISSUE!> SEPT. 2, 2003 PREPARED BY ME OR
UNDER MY DIRECT
SUPERVISION AND THAT I
AM A DULY LICENSED SHAKOPEE, MINNESOTA
DRAWN 9Y~ ANC,PLB ARCHITE.CT IN THE STATE A3
OERTEL ARCHITECTS OF" MINNESOTA.
CHECKED BY: JLO
1795 SAINT CLAIR AVE. / ST. PAUL, MN 55105 SIGNATURE ELEV A TIONS
(651) 696-5186 I (651 ) 696-5188 FAX PLOTTED: 9-02-2003 DATE
REGISTRATION
www.oertelarchitects.com REVISIONS, FILE: A1...$AL TSAND_0315.dwQ
...-.....
..
'. FAeRIC COVERED STRUCTURE 211 TYPE MV 4 HEARING COURSE
-SEE SPEC FOR COLOR AND TlPE 1 (MVWE4503SC)
OF FABRIC INFORMATION
/ TACK COAT
UJ
1-0 ,
4' JERSEY BARRIERS :I:~ 2'1 TYPE LV 3 NON-WEARING COURSE
1 ~~ ....
ANCI-lORED TO GROUND. ....... UJ (LVNW3S030C)
+ ::to .'-.' ",,',' ',' ,.
PROVI DE SEALANT @ ~ r:UJ "";:";:-"":"":,:""",,,,,.;',::'::,-,:,,,,,:,,::,.:,,~
VERTICAL CONNECTIONS ::>::t , . r ~, . " " . t 1.: . " .~., " . 1
I L~ ..: ,:" ,..':':.~ ~ .~ ';' ,:,',", 8' MnDOT 313{' CLASS S AGGREGATE BASE
BETWEEN JERSEY m -z ;.Y/</'/',,/ ?-,,//..., /)</ (100% CRUSI-lED)
x-
<{lL. ,.. / // / /,' / /:-'(' /,/ , /,' /
BARRIERS. I-lEAVY DUTY ASPI-lALT LUJ ,~",{..."-,,:!<~>:::<;;\,/<>~<.(:;.....>..; COMPACT TO MIN. OF %% OF MOD. PROCTOR
PROVIDE ALTERNATE PAVING ~2 V /'<'/ ,', .~, /'...//......;/ /...-'/~DENSITY
:0 " / /. / / // / '/ / /, I / / '/ , .
FOR {,I TALL JERSEY ''{' ',,, /- '.' " /.... ," /
1 <( "-, {'...>>-:;,,\.~,(.,:::-~C<>~"-~'>; COMPACT POORLY GRADED SAND TO A MIN.
BARRIERS -
2LL~~-(;;(>>'(~:~~:~~::~\2/ / OF '15% OF MOD. PROCTOR DENSITY
CONe. PIERS, EXTEND]' ~,~ - .~
U - ~BEDROCK - APPROXIMATEL.Y 2' BEL.OW
31-011 ABOVE GRADE
AND 21 +/- DOWN TO 2 2 - II GRADE
BEDROCK NOTE: A4
PROVIDE STRUCTURAL ASPI-lAL T PAVING TO BE INSTALLED PRIOR
ANCI-lOR FROM TO STRUCTURE. PROVIDE BLOCK-OUTS
CONCRETE PIER INTO FOR CONC. FOUNDATION PIERS. NOTES:
BEDROCK
CD SECTION I. IMMEDIATELY PRIOR TO PLACEMENT OF Tl-lE CLASS S AGGREGATE BASE TI-IE
CONTRACTOR SI-IALL TEST1<OLL Tl-IE SUBGRADE HITI-l A LOADED TRUCK I-IA VING A
1/1~1I:=II_OU MINIMUM GROSS WEIGI-lT OF 25 TONS. TI-lE CONTRACTOR SHALL SUeCUT ALL SOFT
OR YIELDING AREAS AND BACKFILL WITI-I SUITABLE MATERIAL CAPABLE OF PASSING
TI-lE TEST ROLL AND COMPACTED TO A MINIMUM OF %% OF MOD. PROCtOR DENSITY.
2. VERIFY STANDARD BITUMINOUS SECTIONS PRIOR TO CONSTRUCTION.
@ DETAIL
2 ~EAVY DUTY A5P~ALT PAVEMENT 111...1'-011
t) PROJECT NUMBER: 03.15 I HERESY CERTlF'Y THAT SHAKOPEE PUBLIC WORKS- SALT/SAND BUILDING SHEET NO.
THIS DOCUMENT WAS
PREPARED BY ME OR
DATE ISSUEC> SEPT. 2, 2003 UNDER MY DIRECT
SUPERVISlell'l Al'lD THAT I
AM A DULY LICEl'lSED SHAKO PEE, MINNESOTA
ORAWtt a:v: ~UC.OLiS AI'lCHITECT IN THE STATE A4
OERTEL ARCHITECTS elF'MINNESOTA,
CHECKED ay: JLO SECTIONS AND DETAILS
1795 SAINT CLAIR AVE. / ST. PAUL, MN 55105 SIG'"ATURE
(651) 696-5186 1(651) 696-5188 FAX PLOTTED: 9.02.2003 DATE
REGISTRATION
www.oertelarchitects.com il:EV1S~l'lSt FILE: ALSAL TSANO_0315.dwg