4.11. SR 12-21-1998iity of
River
ITEH 4.11.
TO:
FROM:
MEMORANDUM
CITY COUNCIL
STEPHEN ROHLF, BUILDING AND
ZONING ADMINISTRATOR
DATE:
SEPTEMBER 21, 1998
SUBJECT: FINAL UPDATE ON LAKE ORONO
Sediment Removal and Disposal
The "Final Excavation Quantities" map attached shows the actual cubic yards of material
removed from the various locations in lake. The "Final Disposal Quantities" map shows
how many actual cubic yards of sediment were placed on each of the disposal sites. The
targeted amount of sediment to be removed from the lake was 109,000 cubic yards. The
actual total amount of sediment removed was 120,152 cubic yards.
The additional material above the targeted amount was removed from the area where the
Elk River first empties into Lake Orono, creating additional room for future
sedimentation. This additional sediment removal was able to be accomplished because
time and money permitted and alternative disposal sites were able to be found. The
various permitting government agencies were also very gracious about allowing
alterations to their permits.
Some city owned parcels benefited from the disposal of sediment from the lake. Roughly
4,000 cubic yards of material high in organic matter were place on an EDA site south of
Highway 10 and will be used as topsoil supplement. In addition, another stockpile of
material high in organic matter was disposed of on city park land in the plat of
Riverplace. The soil in this plat is fairly sandy and the residents there are free to use the
material as a topsoil supplement. Whatever remains of this stockpile after the spring of
the year 2000 will be used on the park property itself.
The original project included shaving the tops off of several of the sand bars in the lobe
of the lake just north of the Highway 10 bridge. The material from these sand bars was to
be left in the lake. This work would have constituted some 6,000 cubic yards of grading,
however, MPCA denied this portion of the project through their permit.
Unfinished Tasks
There are a few final items that are still need to be accomplished before the Lake Orono
project is totally completed. The following are the unfinished tasks for the project and
the estimated time of their completion:
· Establishing benchmarks (winter of'99) - Specific locations for monitoring the future
sedimentation of lake will be established.
13065 Orono Parkway · P.O. Box 490 · Elk River, MN 55330 · TDD & Phone: (612) 441-7420 · Fax: (612) 441-7425
Plantings at Orono Cemetery_ (spring of '99) - The erosion control at Orono Cemetery
includes willow staking and planting bushes that are proposed to accomplished next
spring. The Sherbume County Tree Board is interested in doing this work. The final
settlement of grant money for this erosion control can not happen until all the work is
completed. The erosion control at Orono Cemetery was ranked number one in the
state by the Minnesota Board of Water and Soil Resources to receive a "Special
Projects" grant.
Final planting at the Bickman and Hartman disposal sites (spring of '99) - Alfalfa will
be the final cover placed on the Bickman site and red clover will be seeded on
Hartman's. The sites have already been adjusted for acidity and fertilizer. To save
money the Street Department will likely do the planting.
Final grading and seeding of the Tim Smith disposal site (spring of '99) - Veit is
responsible for the grading and the city will probably do the seeding.
Removal of silt fence (summer of '99) - After the vegetation on the disposal sites and
access areas from the lake are well established, Veit will remove silt fence used for
erosion control.
Future Lake Work
The following are staff's recommendations regarding the sedimentation and water quality
of Lake Orono in the future:
Cooperate with the Elk River Watershed Board on improving water quality and
controlling erosion in the Elk River. It would be logical for someone from the Lake
Orono Improvement Association to represent the City of Elk River on this board.
John Weicht has already been appointed to the Sherburne County Water Plan
Committee, which is another body with whom the city should stay active.
· Continue joint City/Lake Orono Improvement Association meetings to work on lake
and river issues.
· Develop ongoing plans for Lake Orono and the Elk River to monitor fecal coliform,
sedimentation, etc..
Individual Lake Projects
Numerous property owners on the lake took advantage of the lake being drained to do
improvements to their shorelines. Only ten of these individual projects, ranging from
sediment removal to retaining walls, were for work that required a DNR permit. As of
the date of this memo, all but one of the individual projects that required a DNR permit
are completed and resolved.
LAKE IMPROVEMENT EXPENSES
LAKE ORONO SEDIMENTATION AND WATER QUALITY STUDY
6/96 to 10/97
$39,800 - original estimate from Wenck and Associates
$29,000 - revised estimate from Wenck using volunteers
$25,407 - amount paid to Wenck for study
COSTS
$25,407 - Wenck & Associates $6,600 - B & Z Staff time (estimated)
$3,994 - Sherburne Soil and Water Conservation District testing and labor
??????? - Volunteer time and equipment
$36,001 - Actual cost of study not including volunteer time and equipment
CONTRIBUTIONS
?????? - Lake Association volunteer time
$9,000 - Sherbume County cash contribution
$5,000-
$3,994-
$1,000
$6,600
$10,407
$36,001
Elk River Lion's Club cash contribution
Sherbume Soil and Water Conservation District testing and labor
- Lake Orono Improvement Association cash contribution (outstanding)
- City of Elk River B & Z Staff time (estimated)
, , - City of Elk River cash contribution
- Not including volunteer time
LAKE ORONO SEDIMENTATION REMOVAL PROJECT
Summar~
$750,000 - Feasibility Study estimated cost (does not include staff or volunteer time)
$705,118 - Actual cost of items covered in feasibility study (items included in
feasibility study number in following detail are noted by *)
$725,097 - Total of all cost for dredging project
$373,097 - City contribution (includes $57,200 assessed to city and $14,950 in-kind)
$352,000 - Total amount assessed for project (does not includes $57,200 assessed to city)
$376,604 - Adjusted city contribution [minus $13,500 Orono Cemetery grant (estimated)
plus $17,007 city lake study contribution ($10,407 cash & $6,600 staff time)]
Detail
PROJECT ANALYSIS AND DESIGN
10/97 to 12/97
$2,559 - Wenck and Associates
$270 - Aerial photos of lake 10/15/97 & 10/17/97
*$28,916 - Engineering plans & specifications and bid letting
$2,400 - B & Z stafftime (estimated)
$34,145
PERMITS ACQUISITION
1/1/98 to 8/3/98
*$2,439 - Wenck and Associates
*$500 - DNR permit
*$85 - MPCA permit
$3,600 - B & Z stafftime (estimated)
*$1,700 - Phase I Archaeological Survey at Orono Cemetery disposal site
*$1,549 - Legal disposal site agreements
$9,873
PROJECT CONSTRUCTION
8/4/98 to 10/31/98
Engineering
*$8,824 - Construction staking,
*$27,829 - Inspection
* $6,132 - Administration
$42,785
Miscellaneous
*$902
*$28
$2,200
*$1,023
*$823
*$11
*$58
*$12
*$7,500
*$3,206
$15,763
- Postage & publishing
- Garbage service for lake clean-up day
- Bickman staging area agreement
- Westwood storm sewer erosion control (sod & rip-rap)
- Prairie grass seed
- PH testing at Bickman's
- Aerial photos prior to refilling lake
- Copies
- Bond issuance (estimated)
- Engineering assessment role
Street Department
$450
$450
$160
$400
$50
$350
$50
$180
$360
$600
$5oo
$3,550
- Manpower hosting lake cleanup drop-off
- Removing barrels and other debris from the lake
- Putting up fencing at Orono Cemetery
- Patching the parking lot at the Elk River Bowl
- Patching the drive at the Orono Cemetery
- Backhoe time removing sediment at Westwood Subdivision storm sewer outlet
- Putting up warning signs on public property adjacent to the lake
- Controlling spillway at dam
- Repair of Orono Beach boat ramp
- Repair storm sewer rip-rap adjacent to City Hall
- Future seeding at Bickman, Hartman, and Smith disposal sites (estimated)
Building & Zoning Department
$5,400 - Time spent on project during construction (estimated)
Veit & Co., Inc.
*$612,581 - River diversion and sediment excavation and disposal
Sherbume Count,/Tree Board
* $1,000 - Plantings for Orono Cemetery erosion control, if job is accepted (estimated)
Summary of Project
The goal for the Lake Orono Improvement Project was to remove 109,000 cubic yards of
sediment from the lake with most of the effort being concentrated in the west end. The
feasibility study estimated the cost of this work at $750,000. Lastly, the permits for the
project required the work to be completed no later than October 31, 1998.
The total sediment removed from the lake was 120,152 cubic yards with the additional
yardage coming from the west end. The cost of the project was $705,118 (feasibility
numbers). Lake Orono was restored to its full depth on October 31, 1998.
The feedback from the lake owners, disposal site owners, and permitting governmental
agencies is all positive. Safety hazards have been eliminated and navigable depth has
been restored to all four lobes of the lake. In addition, numerous lake owners took
advantage of the situation to improve their shorelines. Now if the projects last for more
than a couple of years it can be considered a success.
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REWSED 2/~1/98
CONSTRUCTION NOTES LEGEND
I SLOPES FROM ALL $HORELr,=.) SHALL BE A MINIMUM OF 6:10~ FLATTER
2 . AL_L AREAS IN WORK ZONE NOT SHADED SHALL REMAIN UNEXCAVATED EXPOSED SEDIMENT DEPOSITS WHEN LAKE
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4, · OPTIONAL AREA TO BE KHOCKED DOWN NOT mk:,lO,/ED - SEE CONST. NOTE NO.
VERPLACE
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LEGEND
- DENOTES PROPOSED FILL SITE
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