25-06-53-02 Plans.pdf
PDF 9 MB Posted
- Solicitation number
- 25-06-53-02
- Issued by
- Jasper County, Iowa
About this file
This is an engineering plan document prepared by Endeavor Civil Engineering Inc. for the Iowa Department of Natural Resources detailing a septic mound system installation project located within Wapsipinicon State Park. The project involves installation of a 2,000-gallon septic tank, a 1,000-gallon dosing chamber with pump, and a mound system measuring 137.0 feet by 36.0 feet designed to serve an existing restroom facility. The scope of work includes installation of 235 feet of 2-inch diameter force main pipe, removal of the existing septic tank, installation of distribution trenches with 1-inch diameter pipes, and installation of 4-inch diameter sewer service lines. The mound system will be divided into four equal zones with an indexing valve, each zone designed to receive a quarter of the total design flow of 800 gallons per day. Additional work includes hydroseededing and fertilizing disturbed areas, cutting a gap in existing cable fencing to improve access, and installing a maintenance vault for the indexing valve. The system is engineered in compliance with Chapter 69 of Iowa Code and includes specific requirements for pipe materials, gravel placement, and topsoil restoration.
The project specifications establish minimum separation distances of 100 feet between the mound system and a private irrigation well, with detailed requirements for material gradation, distribution trench dimensions, and dose volumes of 35 to 50 gallons per zone. The plan includes provisions for synthetic drainage fabric over distribution trenches, restrictive layer protection with minimum 36-inch separation from gravel, and sloped topsoil blending into existing hillsides. All cleanout locations are designed flush with ground surface to minimize disruption to golf course operations, with green threaded caps specified for maintenance access. The document indicates a project date of 8/26/2026 and specifies that the engineering work was certified by a licensed Professional Engineer in Iowa.
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Other files
| File | Type | Posted |
|---|---|---|
| 25-06-53-02 Bid Package.pdf |
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Text version
IOWA DEPARTMENT OF
NATURAL RESOURCES
SEPTIC MOUND SYSTEM
S E
P T
IC
M
O U
N D
S Y
S T
E M
IO
W
A D
E P
A R
T M
E N
T O
F N
A T
U R
A L
R E
S O
U R
C E
S
IOWA
ONE CALL
800 / 292-8989
TOLL FREE
CALL - BEFORE - YOU - DIG
I hereby certify that this engineering document was prepared by me or under my direct supervision and that I am a duly licensed Professional Engineer under the laws of the State of Iowa.
ENDEAVOR CIVIL ENGINEERING INC.
1 TITLE SHEET
2 GENERAL & MISCELLANEOUS NOTES AND SPECIFICATIONS
3 SITE LOCATION
4 SITE PLAN VIEW
5 MOUND SYSTEM LAYOUT AND DETAILS
SH
AW
RD
228 A V
E
GRANT WOOD RD
120 ST
SLIDE ROCK RD
150 ST
138 ST
A V
E
C O
R D
E
SLIDE ROCK RD
SHOOTING STAR RD
150 ST
FOREST
CHAPEL RD
205 AVE
D
EA
R B
O
RN
R D
STONECITY RD
ANAMOSA
F A I R V I E W
CO HOME RD E23
RID
G
E RD E28
ST
O
NE C
ITY
R D X
‒‒0
8/26/2026
GENERAL NOTES
Endeavor Civil Engineering
SEPTIC TANK
DOSING CHAMBER
MOUND FILL MATERIAL
MOUND GRAVEL MATERIAL
PROJECT LOCATION WITHIN PARK
WAPSIPINICON STATE PARK
INSTALL 2,000 GALLON
SEPTIC TANK
INSTALL 1,000 GALLON
DOSING CHAMBER
WITH PUMP
EXISTING RESTROOM
FACILITY
PROPOSED MOUND SYSTEM LOCATION
DIMENSIONS: 137.0' x 36.0'
(SEE SHEET 5 FOR ADDITIONAL DETAILS)
INSTALL 235 FEET OF 2" DIA. SDR 26 OR STRONGER
SANITARY SEWER FORCE MAIN PIPE, FIRST 60 FEET OF
PIPE FROM DOSING TANK MAY BE TRENCHED, BORE
REMAINING PIPE IN AREAS OUTSIDE OF MOUND
WHERE POSSIBLE TO MINIMIZE DISTURBANCE TO
GOLF COURSE. PIPE SHALL ALSO HAVE A POSITIVE
SLOPE TO IT TO ALLOW EFFLUENT TO BACKFLOW INTO
DOSING CHAMBER BETWEEN PUMPINGS
REMOVE EXISTING
SEPTIC TANK
75' LONG RUNS OF 1" DIAMETER
SDR26 IN 2 FOOT TRENCHES (SEE
SHEET 5 FOR ADDITIONAL DETAILS)
INSTALL 15 FEET OF 4" DIA. SDR 26
OR STRONGER SEWER SERVICE AT
A MIN. 1% SLOPE
MAINTAIN MINIMUM OF 10 FOOT
SEPARATION BETWEEN EDGE OF
MOUND SYSTEM AND WATER
IRRIGATION LINE
INSTALL 5 FEET OF 4" DIA. SDR 26
OR STRONGER SEWER SERVICE AT
A MIN. 1% SLOPE
783 785
HYDROSEED, AND FERTILIZE OVER ALL
DISTURBED AREAS.
BLEND TOP SOIL COVER INTO
EXISTING HILL SIDE SURROUNDING
MOUND SYSTEM DISTRIBUTION
AREA
IRRIGATION LINE
IRRIGATION LINE
IRRIGATION LINE
IR
RI
GAT
IO
N LI
NE
PRIVATE IRRIGATION WELL
EDGE OF MOUND AREA IS 101' AWAY FROM
IRRIGATION WELL. MAINTAIN MINIMUM
100' SEPARATION DURING CONSTRUCTION
CONTRACTOR TO CUT GAP IN EXISTING CABLE FENCE AT
LOCATION DETERMINED SUITABLE BY THE DNR TO
PROVIDE BETTER ACCESS TO RESTROOM FACILITY FROM
THE GOLF COURSE. A NEW POST MATCHING THE
EXISTING POSTS SHALL BE INSTALLED 3.5' FROM AN
EXISTING POST IN THE GAP TO RE-ATTACH THE CABLE TO
FOR PEDESTRIAN ACCESS.
FOUR WAY INDEXING VALVE FOR ZONED MOUND SYSTEM. LOCATE
OUTSIDE OF FILL SAND AREA INSIDE SMALL UTILITY VAULT NO MORE
THAN 24 INCHES DIAMETER OR OF SUFFICIENT SIZE FOR MAINTENANCE
ACCESS. SURFACE OF VAULT SHALL BE FLUSH WITH OR SLIGHTLY BELOW
EXISTING GROUND TO PREVENT DISTURBANCE OF GOLF COURSE.
CAP SYSTEM WITH 12
INCHES OF TOP SOIL
BLEND ENDS OF
TOPSOIL LAYER INTO
EXISTING HILL SLOPE
SAND FILL MATERIAL
LAYER: 2.25' THICK
2' WIDE DISTRIBUTION
TRENCHES
RESTRICTIVE LAYER
PLOWED SURFACE
SHAPE ENDS TO AT
LEAST 3:1 SLOPE
1" DIA. DISTRIBUTION PIPE
4 FOOT SPACING OF
DISTRIBUTION TRENCHES
PLACE SYNTHETIC
DRAINAGE FABRIC OVER
DISTRIBUTION TRENCHES
SECTION A-A (TYPICAL SECTION)
NOTES:
GRAVEL IN DISTRIBUTION TRENCHES SHALL BE PLACED A MINIMUM OF 6 INCHES
BELOW THE DISTRIBUTION PIPE, AND A MINIMUM OF 2 INCHES ABOVE THE
DISTRIBUTION PIPE.
MATERIAL UTILIZED IN DISTRIBUTION TRENCHES SHALL COMPLY WITH SPECS AS
OUTLINED IN SHEET 2 OF THESE PLANS AND CHAPTER 69 OF IOWA CODE.
FILL SAND UTILIZED SHALL COMPLY WITH MATERIAL SPECS FOUND ON SHEET 2 OF
THESE PLANS, AND CHAPTER 69 OF IOWA CODE.
AREA OF MOUND SYSTEM SHALL BE STRIPPED OF VEGETATION BEFORE
CONSTRUCTION WITH THE TOP LAYER BEING PLOWED TO A DEPTH OF 8 INCHES.
TOP SOIL UTILIZED SHALL CONSIST OF QUALITY NATIVE SOIL FROM THE AREA
HAULED IN BY CONTRACTOR
MOUND SYSTEM SHALL BE SPLIT INTO FOUR EQUAL ZONES WITH AN INDEXING
VALVE. EACH ZONE SHALL RECEIVE A QUARTER OF THE TOTAL DESIGN FLOW OF 800
GALLONS PER DAY (200 GALLONS MAX/ZONE/DAY). EACH ZONE CONSISTS OF 8
LATERALS OF 32 FEET IN LENGTH BRANCHING OFF A 2 INCH DIAMETER CENTER
MANIFOLD
INDEXING VALVE SHALL BE PLACED IN MAINTENANCE VAULT AS DESCRIBED ON
PAGE 4. TOP OF VAULT SHALL BE PAINTED GREEN AND PLACED FLUSH OR SLIGHTLY
BELOW SURFACE TO NOT DISTURB GOLF COURSE OPERATIONS. IF INSTALLED
BELOW SURFACE, AN IRON PIN OR OTHER MEANS OF DETECTION SHALL BE PLACED
IN THE LID SO IT MAY BE EASILY FOUND BY MAINTENANCE WORKERS.
SEE LATERAL INFORMATION TABLE FOR PIPE DIAMETER, PERFORATION SIZE, AND
SPACING.
DOSING OF EACH ZONE TO BE A MINIMUM 35 GALLONS BUT NOT TO EXCEED 50
GALLONS PER DOSING.
CLEANOUTS ON ENDS OF DISTRIBUTION RUNS SHALL BE INSTALLED FLUSH WITH THE
GROUND SURFACE TO PROVIDE MINIMAL DISTURBANCE TO THE GOLF COURSE.
CAPS SHALL HAVE A THREADED CAP WITH GREEN LID SUITABLE FOR GOLF COURSE
MOWING OPERATIONS TO PROVIDE MINIMAL DISTURBANCE TO NORMAL
OPERATIONS.
2" DIA. CENTERAL
FORCE MAIN
MINIMUM 36 INCH SEPARATION
BETWEEN BOTTOM OF GRAVEL AND
RESTRICTIVE LAYER
MOUND DISTRIBUTION SYSTEM PLAN VIEW
ANGLE END OF DISTRIBUTION
PIPE UPWARDS, AND PLACE
CLEANOUTS FLUSH WITH NEW
GROUND SURFACE (TYP.)
A
A
ANGLE END OF DISTRIBUTION PIPE
UPWARDS, AND PLACE CLEANOUTS FLUSH
WITH NEW GROUND SURFACE (TYP.)
MAINTAIN MINIMUM 3' OF
SEPARATION BETWEEN EDGE OF
TRENCHES AND EDGE OF
MOUND SYSTEM
IRRIGATION LINE
ZONE 1
ZONE 2
ZONE 3
ZONE 4
1R
1L
1L
1R
2L 3L
4L 1L
2L 3L
4L
2R 3R
4R 1R
2R 3R
4R
8 DISTRIBUTION TRENCHES IN EACH ZONE
OFF CENTRAL MANIFOLD, 2 FOOT WIDE BY
32 FEET LONG SPACED AT 4'-0" SEE TABLE
FOR ADDITIONAL DETAILS ON LATERALS
2 IN. DIA. SUPPLY
LINES TO ZONES
2L
3L
4L
1L
2L 3L
4L
2R 3R
4R
1R
2R
3R
4R
8 DISTRIBUTION TRENCHES IN EACH ZONE OFF
CENTRAL MANIFOLD, 2 FOOT WIDE BY 32 FEET
LONG SPACED AT 4'-0" SEE TABLE FOR
ADDITIONAL DETAILS ON LATERALS
2 IN. DIA. SUPPLY
LINES TO ZONES
(4) WAY
INDEXING VALVE
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