Public Works Committee Packet - 8/18/2014
CITY OF MUSKEGO
PUBLIC WORKS COMMITTEE AGENDA
August 18, 2014
6:00 PM
Aldermen’s Room – Upper Level of City Hall,
W182 S8200 Racine Avenue
CALL TO ORDER
PLEDGE OF ALLEGIANCE
ROLL CALL
STATEMENT OF PUBLIC NOTICE
APPROVAL OF MINUTES HELD JULY 21, 2014
STATUS OF PROJECTS
Discussion update. No formal action may be taken on any of the following:
1. Circle Drive Storm Sewer
2. Woods Road Bridge
3. 2014 Road Improvement Program
4. Jensen Park Lift Station Upgrade
UNFINISHED BUSINESS
Discussion update and possible action may be taken on any or all of the following:
NEW BUSINESS
Discussion update and possible action may be taken on any or all of the following:
1. Review Circle Drive flood mitigation project alternatives.
2. Discuss Crystal Lake Subdivision outstanding Developer completion items.
3. Review request made by Rob Miller Homes for variance from the groundwater
separation requirements for a new home at S86 W17877 Woods Road.
NEW BUSINESS PLACED ON FILE
(The following items have been placed on file for staff review. Upon completion of review, staff
will submit a supplement detailing options and possible course of action to committee
members.)
COMMUNICATIONS AND MISCELLANEOUS BUSINESS AS AUTHORIZED BY LAW
ADJOURNMENT
NOTICE
IT IS POSSIBLE THAT MEMBERS OF AND POSSIBLY A QUORUM OF MEMBERS OF OTHER GOVERNMENTAL BODIES OF
THE MUNICIPALITY MAY BE IN ATTENDANCE AT THE ABOVE-STATED MEETING TO GATHER INFORMATION; NO ACTION
WILL BE TAKEN BY ANY GOVERNMENTAL BODY AT THE ABOVE-STATED MEETING OTHER THAN THE GOVERNMENTAL
BODY SPECIFICALLY REFERRED TO ABOVE IN THIS NOTICE.
ALSO, UPON REASONABLE NOTICE, EFFORTS WILL BE MADE TO ACCOMMODATE THE NEEDS OF DISABLED
INDIVIDUALS THROUGH APPROPRIATE AIDS AND SERVICES. FOR ADDITIONAL INFORMATION OR TO REQUEST THIS
SERVICE, CONTACT MUSKEGO COMMUNITY DEVELOPMENT DEPARTMENT, (262) 679-4136.
Unapproved
CITY OF MUSKEGO
PUBLIC WORKS COMMITTEE MINUTES
July 21, 2014
6:00 PM
Aldermen’s Room – Upper Level of City Hall,
W182 S8200 Racine Avenue
CALL TO ORDER
Ald. Bob Hammel called the meeting to order at 6:00 PM.
PLEDGE OF ALLEGIANCE
Ald. Hammel led those present in the Pledge of Allegiance.
ROLL CALL
Ald. Hammel, Ald. Wolfe and Ald. Engelhardt were present.
STATEMENT OF PUBLIC NOTICE
The meeting was noticed in accordance with the Open Meeting Laws.
APPROVAL OF MINUTES OF MEETING HELD JUNE 16, 2014
Alderman Wolfe made a motion to approve June 16, 2014 minutes. Alderman
Engelhardt seconded.
Motion Passed 3 in favor.
STATUS OF PROJECTS
Discussion update. No formal action may be taken on any of the following:
Janesville Road Reconstruction
Racine Avenue Recreational Trail
Gold Drive Storm Sewer
Circle Drive Storm Sewer
Woods Road Bridge
2014 Road Improvement Program
UNFINISHED BUSINESS
Discussion update and possible action may be taken on any or all of the following:
NEW BUSINESS
Discussion update and possible action may be taken on any or all of the following:
Discuss Jensen Park lift station improvement project
Alderman Wolfe made a motion to approve staff to proceed with the Jensen Park lift
station improvement project at this time for approximate cost of $155,000, which is
$55,000 over budget. Alderman Engelhardt seconded.
Motion Passed 3 in favor.
Review subdivision construction plans for Belle Chasse Addition #2 subdivision
Alderman Engelhardt made a motion to approve subdivision construction plans for
Belle Chasse Addition #2 subdivision contingent upon staff approval. Alderman
Wolfe seconded.
Motion Passed 3 in favor.
NEW BUSINESS PLACED ON FILE
(The following items have been placed on file for staff review. Upon completion of review, staff
will submit a supplement detailing options and possible course of action to committee
members.)
COMMUNICATIONS AND MISCELLANEOUS BUSINESS AS AUTHORIZED BY LAW
ADJOURNMENT
Alderman Wolfe made a motion to adjourn. Alderman Engelhardt seconded at 6:23
PM.
Motion Passed 3 in favor.
Page 1 of 1
CITY OF MUSKEGO
Staff Report to Public Works Committee
To: Public Works Committee
From: David Simpson, P.E., Director of Public Works/City Engineer
Subject: Discuss alternatives for flood mitigation at Circle Drive and Richdorf Dr.
Date: August 15, 2014
Background Information:
The City has been working toward an alternative to reduce the likelihood of
flooding at Racine Avenue & Richdorf Drive and Circle Drive & Richdorf Drive.
Last year, the Common Council asked me to examine other alternatives to the
proposed box culvert improvement, which might have cost as much as $700,000
according to preliminary budget numbers. The Common Council budgeted $40,000
to continue to look into alternatives and design a solution that would potentially be
implemented in 2015. We hired Ruekert and Mielke to further examine the
proposed solution of lowering the roadway to create and overland flowpath, but
after survey work was completed it was apparent that this solution would not work
because of driveway elevations, with some being as steep as 35%. The maximum
driveway slope we generally allow is 8%. Knowing that this alternative is not
feasible we continued examining all alternatives which are outlined in the attached
report.
It would seem as though the most practical alternative is to replace the existing pipe
with a large box culvert at an estimated cost of $594,420.00.
Recommendation for Action by Committee:
Direct staff to move forward with the Committee’s preferred alternative and budget
for construction in 2015.
Your Infrastructure Ally
W233 N2080 Ridgeview Parkway Waukesha, WI 53188-1020 Tel. (262) 542-5733
~Muskego City 13‐10009 Circle Drive Reconstruction > 200 Design > Bidding > Circle Drive Flood Mitigation Options‐20140814.docx~
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
August 14, 2014
Mr. David Simpson, P. E.
Director of Public Works/City Engineer
City of Muskego
P.O. Box 749
Muskego, WI 53150-0749
Re: Circle Drive Flood Mitigation Options
Dear Dave:
This report serves as a summary document related to the evaluation of six alternatives to
mitigate flooding or reduce the effects of flooding near the Richdorf Drive/Circle Drive
intersection.
The alternatives evaluated are as follows:
1. Construct an overland flow path (OFP) within the roadway of Circle Drive and
Oak Court.
2. Construct an OFP within the roadway of Circle Drive to Oak Court and install a
new sewer from this location to the lake.
3. Install a supplemental box culvert along the east property line of W19020 Circle
Drive.
4. Replace existing 48" x 68" CMP with 12' x4' box culvert in existing easement.
5. Construct OFP along east property line of W19020 Circle Drive and flood
proofing the structure.
A more detailed discussion of each alternative can be found on the following pages. An
opinion of probable project cost and exhibit demonstrating the proposed improvements
accompany each alternative discussion.
Your Infrastructure Ally
Mr. David Simpson, P. E.
Re: Circle Drive Flood Mitigation Options
August 14, 2014
Page 2
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
If you have any questions on the above please contact this office.
Very truly yours,
RUEKERT & MIELKE, INC.
Kenneth R. Ward, P.E. (WI)
Principal/Office Manager
kward@ruekert-mielke.com
KRW:crp
cc: File
Your Infrastructure Ally
Mr. David Simpson, P. E.
Re: Circle Drive Flood Mitigation Options
August 14, 2014
Page 3
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
ALTERNATIVE 1 - Construct Overland Flow Path Down Circle Drive and Oak Court
This alternative includes the following:
reconstruction of Circle Drive and Oak Court to create OFP
construction of earthen berm on the north side of Circle Drive to contain/divert flow to
roadway
replacement of sanitary sewer manholes due to the lower road profile
removal of existing storm sewer to accommodate OFP
Refer to the attached Exhibit 1 for a map of the proposed improvements.
The opinion of probable project cost is found in the table below.
Disadvantages of this alternative include the following:
requires construction easements from multiple property owners
lower road profile conflicts with existing utilities
requires extensive restoration
driveway slopes range between 10% and 35% to tie into lower road profile
questionable aesthetics of roadway
extensive disruption to residents
deliberate roadway flooding
still requires eventual replacement of 48” x 68” CMP
Item # Description Unit Quantity Unit Price Total
1 Construct Road to Subgrade L.S. 1 $50,000.00 $50,000.00
2 Crushed Aggregate Base Course TON 1000 $15.00 $15,000.00
3 4-Inch Asphaltic Concrete Pavement TON 435 $65.00 $28,275.00
4 18-Inch Concrete Curb and Gutter L.F.1080 $12.00 $12,960.00
5 Replace Driveways S.F. 4500 $45.00 $202,500.00
6 Remove and Replace Sanitary Manholes EA. 5 $2,000.00 $10,000.00
7 Remove 30-Inch Storm Sewer L.F.650 $10.00 $6,500.00
8 Earthwork Including Berm Along Circle Drive L.S. 1 $25,000.00 $25,000.00
9 Construct New Boat Landing L.S. 1 $5,000.00 $5,000.00
10 Restoration L.S. 1 $15,000.00 $15,000.00
Sub Total $370,235.00
20% $74,047.00
Estimated Total Project Cost $444,282.00
Contingency, Legal, Administrative and Engineering
Your Infrastructure Ally
Mr. David Simpson, P. E.
Re: Circle Drive Flood Mitigation Options
August 14, 2014
Page 4
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
moderate improvement to flood elevation along Richdorf Drive
For the reasons stated above we recommend abandoning this alternative from further
consideration.
ALTERNATIVE 2 - Construct Overland Flow Path (OFP) Down Circle Drive and Install
Relief Pipe Down Oak Court
This alternative includes the following:
reconstruction of Circle Drive to create OFP to Oak Court
installation of high capacity inlet and box culvert down Oak Court
construction of earthen berm on the north side of Circle Drive to contain/divert flow to
roadway
replacement of sanitary sewer manholes due to the lower road profile
removal of existing storm sewer to accommodate OFP
Refer to the attached Exhibit 2 for a map of the proposed improvements.
The opinion of probable project cost is found in the table below.
Item # Description Unit Quantity Unit Price Total
1 6' x 4' Concrete Box Culvert L.F. 400 $1,000.00 $400,000.00
2 6' x 4' Concrete Wing Wall Structure EA 1 $6,500.00 $6,500.00
3 High Capacity Inlet Structure EA 1 $10,000.00 $10,000.00
4 Construct Road to Subgrade L.S. 1 $25,000.00 $25,000.00
5 Crushed Aggregate Base Course TON 470 $15.00 $7,050.00
6 3-Inch Asphaltic Concrete Pavement TON 130 $65.00 $8,450.00
7 18-Inch Concrete Curb and Gutter L.F.280 $12.00 $3,360.00
8 Replace Driveways S.F. 2200 $5.00 $11,000.00
9 Remove and Replace Sanitary Manholes EA. 3 $2,000.00 $6,000.00
10 Remove 30-Inch Storm Sewer L.F.650 $10.00 $6,500.00
11 Earthwork Including Landscape Berm Along Circle Drive L.S. 1 $15,000.00 $15,000.00
12 Construct New Boat Landing L.S. 1 $5,000.00 $5,000.00
13 Restoration L.S. 1 $10,000.00 $10,000.00
14 Heavy Rip Rap C.Y. 25 $110.00 $2,750.00
Sub Total $516,610.00
20% $103,322.00
Estimated Total Project Cost $619,932.00
Contingency, Legal, Administrative and Engineering
Your Infrastructure Ally
Mr. David Simpson, P. E.
Re: Circle Drive Flood Mitigation Options
August 14, 2014
Page 5
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
Disadvantages of this alternative include the following:
requires construction easements
elevated construction cost
feasibility of installing box culvert down Oak Court
lower road profile conflicts with existing utilities
requires extensive restoration
questionable aesthetics of roadway
extensive disruption to residents
deliberate roadway flooding
still requires eventual replacement of 48” x 68” CMP
moderate improvement to flood elevation along Richdorf Drive
For the reasons stated for Alternative 1 in addition to the anticipated cost we recommend
abandoning this alternative from further consideration.
ALTERNATIVE 3 - Install Supplemental Pipe Down East Side of W19020 Circle Drive
This alternative includes the following:
installation of high capacity inlet and box culvert down east property line of W19020
Circle Drive
grading and earthwork on north side of Circle Drive
removal of existing storm sewer along Circle Drive to accommodate grading and high
capacity inlet
relay of 48” x 68” pipe in existing easement is now required as 6’ x 4’ box culvert only
lowers flood risk
Refer to the attached Exhibit 3 for a map of the proposed improvements.
Your Infrastructure Ally
Mr. David Simpson, P. E.
Re: Circle Drive Flood Mitigation Options
August 14, 2014
Page 6
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
The opinion of probable project cost is found in the table below.
Disadvantages of this alternative include the following:
requires permanent easements
adds another outfall for City to maintain
requires replacement of 48” x 68” CMP
moderate improvement to flood elevation along Richdorf Drive
ALTERNATIVE 4 - Replace Existing 48" x 68" CMP With 12' x 4' Box Culvert in
Easement
This alternative includes the following:
removing existing 48” x 68” pipe and installing a 12’x4’ large box culvert within and
expanded easement.
flood plain elevation is lowered below all critical elevations.
provides for long-term replacement of existing pipe that is close to the end of its life
cycle.
only disrupts a minimum of residences.
Refer to the attached Exhibit 4 for a map of the proposed improvements.
Item # Description Unit Quantity Unit Price Total
1 Relay 48" x 68" Pipe in Existing Easement L.F. 290 $750.00 $217,500.00
2 Ditch Grading/Earthwork on North Side of Circle Drive L.S. 1 $15,000.00 $15,000.00
3 6' x 4' Concrete Box Culvert L.F. 285 $1,000.00 $285,000.00
4 6' x 4' Concrete Wing Wall Structure EA 1 $6,500.00 $6,500.00
5 High Capacity Inlet Structure EA 1 $10,000.00 $10,000.00
6 Replace Driveways S.F. 1500 $5.00 $7,500.00
7 Remove 30-Inch Storm Sewer L.F.170 $10.00 $1,700.00
8 Heavy Rip Rap C.Y. 25 $110.00 $2,750.00
9 Sod Restoration S.Y 1000 $10.00 $10,000.00
10 Easement Acquisition L.S. 1 $70,000.00 $70,000.00
Sub Total $625,950.00
20% $125,190.00
Estimated Total Project Cost $751,140.00
Contingency, Legal, Administrative and Engineering
Your Infrastructure Ally
Mr. David Simpson, P. E.
Re: Circle Drive Flood Mitigation Options
August 14, 2014
Page 7
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
The opinion of probable project cost is found in the table below.
Disadvantages of this alternative include the following:
requires additional permanent easements
close proximity of house at W190S7558 Richdorf Drive to proposed culvert
ALTERNATIVE 5 - Construct Overland Flow Path (OFP) Down East Side of W19020
Circle Drive and construct new garage and flood proof residence
This alternative includes the following:
construction of OFP down east property line of W19020 Circle Drive.
grading and earthwork on north side of Circle Drive.
construction of new garage at higher elevation at W19020 Circle Drive.
floodproofing of W19020 Circle Drive.
removal of existing storm sewer along Circle Drive to accommodate grading to OFP.
relay of 48” x 68” pipe in existing easement.
Refer to the attached Exhibit 5 for a map of the proposed improvements.
Item # Description Unit Quantity Unit Price Total
1 12' x 4' Concrete Box culvert L.F. 290 $1,500.00
$435,000.00
2 12' x 4' Concrete Wing Wall Structure EA 2 $6,500.00
$13,000.00
3 Easement acquisition L.S. 1 $30,000.00
$30,000.00
4 Sod Restoration S.Y 800 $10.00
$8,000.00
5 Ditch grading in Richdorf and Center L.F. 300 $22.00
$6,600.00
6 Heavy rip Rap C.Y. 25 $110.00
$2,750.00
Sub Total $495,350.00
20% $99,070.00
Estimated Total Project Cost $594,420.00
Contingency, Legal, Administrative and Engineering
Your Infrastructure Ally
Mr. David Simpson, P. E.
Re: Circle Drive Flood Mitigation Options
August 14, 2014
Page 8
Waukesha, WI Kenosha, WI Madison, WI Itasca, IL
www.ruekert‐mielke.com
The opinion of probable project cost is found in the table below.
Disadvantages of this alternative include the following:
requires permanent easements.
requires flood proofing private residence.
feasibility of constructing channel between homes is difficult.
safety of high volume channel between residential properties.
requires replacement of 48” x 68” CMP.
moderate improvement to flood elevation along Richdorf Drive.
requires construction of retaining wall to not affect adjacent parcel.
high cost of easement acquisition due to negative effect on existing parcels.
Item # Description Unit Quantity Unit Price Total
1 Relay 48" x 68" Pipe in Existing Easement L.F. 290 $750.00 $217,500.00
2 Ditch Grading/Earthwork on North Side of Circle Drive L.S. 1 $5,000.00 $5,000.00
3 Grade Swale From Circle Drive Down East Side of W19020 L.S. 1 $75,000.00 $75,000.00
4 Flood proofing at W19020 circle Drive L.S. 1 $125,000.00 $125,000.00
5 Reconstruct Driveway at W19020 S.F. 1500 $12.00 $18,000.00
6 Remove 30-Inch Storm Sewer L.F.170 $10.00 $1,700.00
7 Heavy Rip Rap C.Y. 25 $110.00 $2,750.00
8 Restoration S.Y 1500 $4.00 $6,000.00
9 Retaining wall construction adjacent to home S.F. 500 $45.00 $22,500.00
10 Easement Acquisition L.S. 1 $100,000.00 $100,000.00
Sub Total $573,450.00
20% $114,690.00
Estimated Total Project Cost $688,140.00
Contingency, Legal, Administrative and Engineering
Page 1 of 2
CITY OF MUSKEGO
Staff Report to Public Works Committee
To: Public Works Committee
From: David Simpson, P.E., Director of Public Works/City Engineer
Subject: Crystal Lake Subdivision - Final Completion
Date: August 14, 2014
The Developer of the Crystal Lake Subdivision, Weber Homes Inc, represented by
Tracy Weber has failed to complete the remaining items within the Crystal Lake
development, which include the final lift of asphalt, inlet adjustments, asphalt base
layer repairs and street tree plantings. The Developer is refusing to complete these
improvements so we have obtained the full letter of credit balance of $66,000 and
placed it into a City account so that the funds are secure as we decide how to
proceed.
I have estimated the completion items and the associated costs as follows:
Repair base course asphalt: 1,200 s.y.@ $22.00/s.y.= $26,400
Repair subgrade: (900 s.y.) 600 ton @ 25.00/ton= $15,000
Repair damaged curb & gutter: 220 l.f.@ $64.00/l.f.= $14,080
Install permanent curb inlets: 6 each @ $950/each= $5,700
Install final lift of asphalt: 380 tons @ $69/ton= $26,220
Engineering: to be completed by City staff= $0
Install street trees: 51 trees & $400/each= $20,400
TOTAL ESTIMATED COST= $107,800
Letter of Credit = $66,000
Deficient Balance= $41,800
The above cost estimate is based on this year’s costs which we know are likely
higher than we might be able to obtain if we bid this with next year’s road program.
The quote above also includes the cost of repairing the temporary cul-de-sac, which
may be removed by a future development in the near or distant future as no
development plans are currently approved. This subdivision is relatively rural in
feel so some consideration should be given to not planting the trees at this time as
well. We will be issuing citations to the Developer in hopes of receiving a judgment
in the City’s favor as well as successfully collecting the judgment from the
Developer. Knowing all of this I have the following options for the Committee to
discuss as well as any other ideas the Committee may have:
Option #1- Complete all outstanding work in 2015 and assess some or all of the
remaining costs to the residents in the subdivision if we are not successful at
collecting the balance owed from the Developer.
Page 2 of 2
Option #2- Complete the roadway work only in 2015 (no trees) and assess some
or all of the cost to the residents in the subdivision if we are not successful at
collecting the balance owed from the Developer.
Option #3- Complete the roadway work only in 2015 (no trees) minus the
temporary cul-de-sac area which will leave the total cost near the $66,000 we
have currently on hand to complete the project. Any small amount over the
$66,000 can be covered by the road program budget. Still pursue the Developer
and if successful in collecting a judgment only then complete the remaining cul-
de-sac work and installation of the street trees.
Recommendation for Action by Committee:
Discuss options and recommend an action for staff to proceed with.
CITY OF MUSKEGO
Staff Report to Public Works Committee
To: Public Works Committee
From: David Simpson, P.E., Director of Public Works/City Engineer
Subject: Review request made by Rob Miller Homes for variance from the
groundwater separation requirements for a new home at S86W17877 Woods
Road
Date: August 15, 2014
The builder for a new home being constructed at S86W17877 Woods Road is
requesting that the City allow the home to be constructed closer to the seasonal high
ground water level than our codes require. Our code currently requires a
separation of two feet from the seasonal high ground water elevation to the top of
the basement floor. This is designed to prevent sump pumps from running
continuously during high ground water times and to protect the homes basement
from potential water infiltration.
In this case, the builder is requesting that we allow a one foot separation and has
provided a report from a professional engineer, which is attached. I have reviewed
his report and feel that we can allow a one foot separation in this case if they
provide the engineered drainage solution that is discussed in the report as well as a
letter from the owners stating that they understand the potential for their sump
pump to run during high ground water events.
Recommendation for Action by Committee:
Allow a one foot separation between the seasonal high ground water elevation and
the basement floor for the new home at S86W17877 Woods Road contingent upon
receipt of a letter of understanding from the owners and installation of an
engineered drainage system in the basement.
Page 1 of 1
LETTER OF TRANSMITTAL
LANDMARK
ENGINEERING SCIENCES, INC.
119 Coolidge Avenue - Suite 100, Waukesha, WI 53186-6602
Telephone: 414-719-2769
Email: LandMark-Engineering@live.com
To:
C:
Rob Miller
Rob Miller Homes
P.O. Box 180599
Delafield, Wisconsin 53018
Kyle Spader
Date: June 19, 2014
Project No.: 2226.00
Description: Soil Assessment -Residential Lot
Lot 1 – CSM# 8230
Muskego, Wisconsin 53150
WE ARE SENDING YOU the following items via: U. S. Mail Overnight Hand Deliver Other:
Fax 262-646-9789 11 pages E-Mail rob@robmillerhomes.com
Copies/Qty. Date Description
1 05 JUN 2014 Soil Assessment Report (revised 19JUN2014)
THESE ARE TRANSMITTED as checked: For Approval For Your Use For Review & Comment
As Requested Other:
Message:
Attached is the revised report for the referenced lot, as requested by the City of Muskego.
If you have any questions or comments on the revised Soil Assessment Report, please call. Thank you.
Copy to: file Signed:
If enclosures are not as noted, kindly notify us at once.
C:\Users\Asus\Documents\Landmark\2226 - Rob Miller Homes (Muskego-Geo)\2226-Soil Assessment Report (REV'D20140619).Docx
LANDMARK
ENGINEERING SCIENCES, INC.
119 COOLIDGE AVENUE - SUITE 100, W AUKESHA, WISCONSIN 53186-6602
TELEPHONE: 414-719-2769
EMAIL: LandMark-Engineering@live.com
Soil Assessment Report
Project: Soil Assessment - Residential Lot Project No.: 2226.00
Location: Lot 1 – CSM# 8230, Muskego, Wisconsin 53150 Date(s): 05 JUN 2014
(revised 19JUN2014)
Client: Rob Miller Homes Time(s): 1045–1230
Contractor: Badgerland Soil Testing. Weather: Sunny, high 70s °F
Present: Mark Augustine - LandMark Engineering Sciences
Roger Hilmer - Badgerland Soil Testing
Equipment: Soil Penetrometers
Mini-excavator
OBSERVATIONS:
LANDMARK ENGINEERING SCIENCES, INC. (LandMark) arrived at the site on June 5, 2014 at the request of Rob
Miller Homes (client) to conduct a soil assessment of the conditions at and below potential footing grade for the
proposed single-family residence. LandMark observed excavation of one (1) test pit on the lot for the proposed
house location.
A review was conducted of the 2013 Soil Survey of Milwaukee and Waukesha Counties, Wisconsin, prepared by
the U.S. Department of Agriculture - Natural Resources Conservation Service (USDA-NRCS). The soil survey
indicates the soils within the area of the site tested for the house foundations are primarily Elliot silt loams (EsA).
Based on the soil survey, Elliot silt loam soils are generally somewhat poorly drained, very low to moderately
high permeable soils. These soils are formed in silty deposits (loess) over calcareous clayey till. The soil survey
also indicates the seasonal high groundwater depth varies between 12” – 24” for the this soil series; i.e., the elliot
soils may have hydric inclusions.
The subsurface soils encountered at the test pit locations consisted of damp, very dark grayish brown, soft, silt
loams with organics (topsoil) from surface to 0.5’ bgs, underlain by 1.5’ of moist to wet, dark yellowish brown
with high chroma redox indicators, medium firm, clay loam. Below this was wet to saturated, dark yellowish
brown to yellowish brown with high and low chroma redox indicators, firm, silt. Groundwater was observed
coming out of the test pit sidewall at 2.25’ bgs during excavation activities.
LandMark probed the exposed soil with a 3/8-inch diameter metal probe and a penetrometer, and also used
Visual-Manual methods (ASTM 2387) to classify exposed soils. Probing tests indicated that the soils at footing
depths have design soil load bearing capacities of at least 3,000 pounds per square foot (psf).
CONCLUSIONS / RECOMMENDATIONS CONVEYED DURING SITE VISIT(S):
LandMark concludes that:
1) The soils observed at about 2.0’ bgs are considered suitable to support a footing design load of less
than or equal to 3,000 psf. All foundations for the proposed residential building must extend to this
elevation or lower to support residential footing loads of 3,000 psf.
LANDMARK ROB MILLER HOMES
ENGINEERING SCIENCES, INC. 2226.00 – Soil Assessment (Lot 1 – CSM#8230, Muskego)
June 5, 2014 (revised 19JUN2014) Page 2 of 2
2) Groundwater was observed in the soil test pit at 2.25’ bgs (elev. 780.25’). Also, high and low chroma
soil redox indicators were observed at 2.0’ bgs (elev. 780.5’). Please note that groundwater levels
fluctuate both seasonally and annually, thus the actual groundwater level may differ from the levels
observed during our field exploration.
3) Per City of Muskego ordinance, the basement floor elevation must be set at least 2’ higher than the
reduced redox-indicated seasonal high water table. Thus, the minimum floor grade for this lot to
comply with the City of Muskego ordinance is elev. 782.5’.
4) Per Waukesha County ordinance, the basement floor elevation must be set at least 1’ higher than the
redox-indicated seasonal high water table. This would allow the minimum floor grade to be set at
elev. 781.5’, while still minimizing the risk of wet basement and/or “sweating” floor slab and/or
basement walls occurring during times when the water table is at its seasonal high levels. If the sump
pump “on-off” range is also set appropriately, the pump should only run in extreme groundwater
conditions and/or if surface water runoff is inadvertently entering the footing drainage system.
5) LandMark proposes requesting that the City of Muskego Engineering Department grant a waiver to
allow the basement floor elevation be set in accordance with the Waukesha County ordinance limits
(i.e., basement floor grade set at elev. 781.5’), PROVIDED THAT AN ENGINEERED DRAINAGE
SYSTEM IS INCORPORATED INTO THE BASEMENT DESIGN. Ideally, the engineered drainage
system would incorporate a gravity-drained drain tile system with a sump pump backup.
6) The native soils encountered down to test pit termination depths have very low porosity
characteristics due to the large percentage of fine particle soil materials present. Therefore, the water
release rate for these soils is very slow while the water retention capacity is very high. Thus, native
soils are NOT recommended for use as foundation backfill material.
7) Any exposed soil may be susceptible to considerable loss of soil structure, which greatly reduces its
load-bearing capacity, due to the effects of excessive moisture and/or construction traffic on the fine-
grained (silt) components of the soil matrix. Efforts must be made by the contractor to minimize these
impacts during construction.
Foundations may bear directly on the exposed native subgrade. Other project specifications for foundation
preparation must also be followed. Any subgrade soils that later become wet, soft, loose, or disturbed (possibly
due to precipitation, high ground water, or construction traffic) should be removed and the footings deepened to
dense soil before foundations are formed and concrete is poured.
The conclusions and recommendations in this report are made only with respect to the soils exposed during our
site visit and the available research information reviewed. This report is not indicative of a thorough foundation
analysis or geotechnical study. A thorough foundation analysis or geotechnical study would include additional
soil test pits/borings and soil parameter testing.
LANDMARK ENGINEERING SCIENCES, INC.
Mark D. Augustine, PE, RLS, CHMM
President
Encl: Map & USDA Soil Survey Description
Soil Evaluation Report
General Notes
C:\Users\Asus\Documents\Landmark\2226 - Rob Miller Homes (Muskego-Geo)\2226-Soil Assessment Report (REV'D20140619).Docx
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