21321.101 Stockton MoDOT Lagoon Closure Plan_SEALED_CERTIFIED.pdf.crdownload

LAGOON CLOSURE PLAN

FOR

STOCKTON MODOT MAINTENANCE FACILITY – SANITARY SEWER

IMPROVEMENTS

CEDAR COUNTY, MISSOURI

KYLE J. LANDWEHR – PROFESSIONAL ENGINEER

LICENSE NO. PE-2023000495

BARTLETT & WEST, INC.

MISSOURI CERTIFICATE OF AUTHORITY NO. 000167-ENGINEERING

1824 S. Lone Pine Ave., Suite F Springfield, MO 65804

(888) 200-6464

PROJECT NO. 21321.101

DATE PREPARED: OCTOBER 2024

10/01/2024

This page intentionally left blank.

601 Monroe Street, Suite 201

Jefferson City, MO 65101 ph (573) 634-3181 www.bartwest.com

October 1, 2024

Missouri Department of Natural Resources

Southwest Regional Office

2040 W. Woodland

Springfield, MO 65807-5912

Re: Facility Closure Request – Stockton, MO MoDOT Maintenance Facility

To Whom It May Concern:

This letter is intended to serve as supporting documentation for the enclosed facility closure request form

(MO 780-2512) as required for the upcoming wastewater collection system improvement project, which involves the decommissioning of an existing, unpermitted lagoon cell owned by the Missouri Department of Transportation and located in Stockton, Missouri. The Construction permit application for the proposed project will be sent under separate cover. The project is being designed by CASCO Civil. Appendix A shows the location of the lagoon cell and approximate limits of the proposed sanitary sewer improvements.

See the following numbered paragraphs that correspond with PART B – TECHNICAL INFORMATION required by the enclosed facility closure request.

1. Facility description that includes the year operation began and the date it will be taken offline

a. Through review of available records and review of historical aerial imagery, it is evident that the existing lagoon treatment system was constructed between August 2005 and

July 2006. The facility consists of a single, non-discharging lagoon cell as shown in the photo below.

Exhibit 1.a – 1: Photo of Existing Lagoon Cell

b. The facility will be taken offline in 2025 after sewer collection improvements are constructed to receive wastewater flows generated by the maintenance facility. An exact, final construction completion date for the proposed improvement project is dependent on permitting and construction timelines that are yet to be determined.

2. Provide an explanation of how the waste generated from the site will be treated in the future, if applicable (new wastewater treatment facility, Department of Health-approved system, routed to another facility, etc.).

a. Waste generated from the maintenance facility that the existing lagoon cell serves will be routed to the City of Stockton’s wastewater collection system, and eventually treated at the Stockton Wastewater Treatment Plant (MO0055280). The Stockton Wastewater

Treatment Plant has a design flow capacity of 400,000 GPD and sees actual flows of

266,000 GPD on average.

b. Based on information received from MoDOT in an email dated 07/16/2024, there are currently 10 staff members that report to the facility daily. Based on guidance provided in the MoDNR Wastewater Guidelines and Standards Document (2019) in Table 1-1.

Minimum Design Loadings, employee sanitary waste should be estimated at 15 gallons per day per capita, meaning that the facility can be expected to produce, on average, 150 gallons per day. Adding this waste flow to the City of Stockton’s sanitary sewer collection system would raise average daily flows received by the WWTP to 266,150 gallons per day on average, which is well below the design capacity of the WWTP. This demonstrates that Stockton’s WWTP has plenty of excess capacity to receive flow from the existing maintenance facility.

3. Volume of sludge and total area of basin (from outer edges of berms).

a. Based on the site survey enclosed in Appendix B, the approximate total area of the lagoon cell (from outer edges of berms) is 7,860 square feet. Based on the site survey and review of site photos, the estimated water surface area is 3,118 square feet.

b. The volume of sludge in the lagoon was conservatively estimated by using the evident water surface area as the sludge area and assuming an average sludge depth of 3 inches. It should be noted that only a very small area (approximately 1 square yard) was moist enough for a sludge judge to penetrate the sludge. The field crew indicated a depth of approximately 3 inches at this location (as seen in the photos contained in

Appendix H). Given the small area of penetrable sludge, an average depth of 3 inches was assumed across the lagoon’s evident water surface to provide a conservative sludge volume for the purposes of this closure plan.

c. Refer to Table 3.b-1 on the following page for a summary of biosolids volume and mass.

Table 3.b-1: MoDOT Maintenance Facility Lagoon Biosolids Volume and Mass

Description Units Cell No. 1

Approx. Basin Dimension ��� 7,860

����� 0.18

Water Surface Area ��� 3,118

Approx. Basin Depth ���� 5

Water Depth (assumed from water mark in photos) ���� 0.5

Average Sludge Depth (from probing measurements) ���� 0.25

Total Biosolids Volume �� 779.5

Total Biosolids Volume �� 5,831

Percent Solids % 25.75

Total Mass ��� 12,553

Total Mass (Dry) ���� 6.28

Mass within Lagoon Area

34.80

4. Copy of sludge analysis and soil (if applicable) analysis. See Standard Conditions Part III

Section H.

a. See Appendix C for a copy of the Standard Conditions for NPDES Permits, effective

August 1, 2019.

i. Referring to Section I – Closure Requirements, the Stockton MoDOT

Maintenance Facility lagoon falls under paragraph 4 given that it has a design and service capacity of less than 150 persons and is essentially a residential lagoon. Therefore, the sludge within the lagoon may be treated as septage during closure activities. Therefore, testing for fecal coliform is not required to show compliance with Class B biosolids limitations. Testing for metals is also not required per paragraph 4.a. In addition, per paragraph 4.c, since less than 100 dry tons/acre of sludge is contained within the basin, testing for nitrogen is also not required.

b. See Appendix D for a copy of the sludge analysis report, which reports percent solids and PAN based on the sludge sample taken from the lagoon.

5. Description of how the water portion is to be removed, if applicable. (ex. Discharge to stream according to permit; irrigate on surrounding ground; transported to permitted treatment facility; mixed with sludge).

a. Given the low volume of water in the lagoon, the water will be mixed with the sludge.

6. Detailed description of how sludge is to be disposed. (ex. Land applied at agronomic rate, transported to another permitted treatment facility, incorporate with soil on 1:1 basis and left in place). If the permittee is requesting approval for land application, include a calculation of proposed application rates in dry tons/acre. If sludge is to be transported to a landfill, the name and contact information for the landfill must be included.

a. Since the biosolids contained within the lagoon fall under the category of septage, and the volume of biosolids in the lagoon is well under 100 dry tons/acre (referring to

Section I – Closure Requirements, paragraph 4.c), all biosolids remaining in the lagoon will be mixed with soil at a 1:1 ratio by demolishing the berms. Testing for PAN is not required; however, PAN results are included in Appendix D for reference. Refer to

Appendix E, which shows the final grading plan for demolishing the lagoons and regrading the site to drain properly.

7. For mechanical plants, a short summary of solid waste to be removed. If the permittee is requesting approval to leave some clean fill in place (such as concrete), a description of clean fill and its proposed final disposition should be included. Note that concrete basins must either be filled in or, at a minimum, be modified such that they no longer hold water from precipitation. Due to personal liability concerns, most permittees choose to fill in or demolish concrete basins. Approval for repurposing concrete structures may be requested.

a. Not applicable. There is currently an influent manhole to the lagoon that will be removed and disposed of as part of the project. See Appendix B for location and information.

8. If the lagoon closure activities will disturb more than one acre, a land disturbance permit is required. See www.dnr.mo.gov/env/wpp/epermit/help.htm.

a. Not applicable – See Appendix E which shows the total grading area required for demolishing the existing lagoon. This area is approximately 0.7 acres, falling under the

1-acre requirement for a land disturbance permit. However, it should be noted that should the full disturbance area required for the project as a whole be in excess of 1 acre, a land disturbance permit would be required.

9. Proposed project timeline.

a. The timeline below is subject to change depending on final construction permitting approval and the date in which the project is advertised for bids. The schedule below reflects an estimate based on expected review and bidding timeframes.

i. Contractor mobilization to project site: MARCH 2025

ii. Construction of collection system improvements: MARCH 2025 – MAY 2025

iii. Lagoon cell closure and regrading: JUNE 2025

iv. Final cleanup and closeout: JULY 2025 – AUGUST 2025

10. Any additional information that might be pertinent to the proposed facility closure.

a. A draft set of construction plans showing the proposed improvements to send wastewater flow from the Stockton MoDOT maintenance facility to the City of

Stockton’s wastewater collection system are included in Appendix F. The Construction permit application for the proposed project will be sent under separate cover. The project is being designed by CASCO Civil. Appendix G includes a copy of the technical specification for lagoon closure that will be included in the project’s bid manual.

b. Additional site photos showing the current status of the lagoon cell and the sludge sample location are contained in Appendix H.

Should you need any additional information throughout the review process, please do not hesitate to contact me.

Sincerely, Kyle J. Landwehr, P.E., ENV SP – Project Manager (Bartlett & West, Inc.)

cc: Sarah Fonda, P.E. – Project Manager (CASCO CIVIL)

APPENDIX A

PROJECT LOCATION MAP

/2

1/

, 1 1:

A

M G oo gl e M ap s ht tp s:

//w w w.

go og le .c om /m ap s/

.7

,-9 3.

3, m /d at a=

!3 m

1!

1e

3?

en try =t tu 1/

Im ag er y

G oo gl e, Im ag er y

A irb us , C

N

ES

Ai rb us

, M ax ar T ec hn ol og ie s, U

SD

A/

FP

AC

/G

EO

, M ap d at a ft

St oc kt on

, M O

Sa ni ta ry E xt en si on

A pp ro xi m at e Li m its of P ro je ct W or k

Lo ca tio n of la go on

APPENDIX B

SITE SURVEY SHOWING LAGOON SURFACE AREAS

7,860 sf

Outside Area of Lagoon Cell

3,118 sf

Inside Area of Lagoon Cell (assumed maximum water level)

APPENDIX C

STANDARD CONDITIONS FOR NPDES PERMITS

APPENDIX D

SLUDGE ANALYSIS REPORT

S to ck to n M oD O

T M ai nt en an ce F ac ili ty S lu dg e S am pl in g

P la n Le ge nd

Ap pr ox im at e

La go on B ou nd ar y ft

N

N Im ag e

A irb us

Im ag e

A irb us

Im ag e

A irb us

N O

T E

: S am pl e lo ca tio ns s ho w n ar e ap pr ox im at e.

S am pl e

T ot al

D ep th : 0

.2 ft S lu dg e D ep th

: 0 .2 ft

SM 2710 B

Sample volume used for total solids test: 24.97 mL Weight of dish: 73.32 g Weight of dish + dried solids: 79.75 g Weight of dried solids: 6.43 g Total Solids: 257.509011 g/L % Solids: 25.75 %

SOUR

Temperature

ºC 0 16.2 9.45 1 15.4 8.37 2 15.0 6.35 3 14.9 5.04 4 14.7 4.25 5 14.7 3.69 6 14.7 3.27 7 14.7 2.95 8 14.7 2.67 9 14.7 2.45

10 14.7 2.25 11 14.7 2.08 12 14.8 1.94 13 14.8 1.83 14 14.8 1.72 15 14.9 1.63

Oxygen Consumption Rate 0.45 mg/L/minute SOUR 0.11 (mg/g)/hr

SOUR Temperature Correction

Average Sewage Sludge Temperature During Test

ºC 14.9

If sewage sludge is > 20°C, SOUR = 0.13 (mg/g)/hr If sewage sludge is < 20°C, SOUR = 0.15 (mg/g)/hr

Bartlett & West 1324/243729-3736/5171

Time: 16:30

Specific Oxygen Uptake Rate (SOUR) Worksheet

SOUR passes if result is ≤ 1.5 (mg/g)hr

Total Solids

Time (Minutes)

Dissolved Oxygen (mg/L)

Date: 09-10-24

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

9.00

10.00

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Di ss ol ve d O xy ge n (m g/ L)

Minutes

CERTIFICATE OF ANALYSIS

BARTLETT & WEST

Re: CaSi File/Case/Log: 1324/243729-3736/5171 Sludge Sample Collected: 09-09-24, 12:00 September 30, 2024 Sludge Sample Received: 09-09-24, 15:25 Page 1

PARAMETER METHOD

WET WEIGHT

VALUE mg/kg

DRY WEIGHT

VALUE mg/kg

DRY WEIGHT

VALUE lbs/ ton

ANALYSIS

DATE/TIME

ARSENIC, total SW-846 Method 3050B/6010 D

0.151 0.59 0.001 09-12-24, 16:39

CADMIUM, total SW-846 Method 3050B/6010 D

<0.008 <0.03 <0.001 09-12-24, 16:39

CHROMIUM, total SW-846 Method 3050B/6010 D

1.16 4.50 0.009 09-12-24, 16:39

COPPER, total SW-846 Method 3050B/6010 D

3.31 12.8 0.026 09-12-24, 16:39

LEAD, total SW-846 Method 3050B/6010 D

2.13 8.26 0.017 09-12-24, 16:39

MERCURY, total SW-846 Method 7471B

0.086 0.33 0.001 09-19-24, 15:49

MOLYBDENUM, total SW-846 Method 3050B/6010 D

<0.008 <0.03 <0.001 09-12-24, 16:39

NICKEL, total SW-846 Method 3050B/6010 D

1.09 4.22 0.008 09-12-24, 16:39

SELENIUM, total SW-846 Method 3050B/6010 D

<0.003 <0.01 <0.001 09-12-24, 16:39

ZINC, total SW-846 Method 3050B/6010 D

11.6 45.0 0.09 09-12-24, 16:39

TOTAL KJELDAHL NITROGEN

SM 4500 N org C

SM 4500-NH3 B

1610 6240 12 09-12-24, 15:50

AMMONIA as NITROGEN SM 4500-NH3 B 194 752 1.50 09-24-24, 12:10

ORGANIC NITROGEN calculation 1416 5488 11.0 09-24-24, 12:10

NITRATE/NITRITE as

NITROGEN

SW 864 Method 9056A

<0.5 <1.94 <0.004 09-12-24, 17:40

TOTAL PHOSPHORUS as P SM 4500-P B/E 200 775 1.55 09-18-24, 13:13

TOTAL POTASSIUM

SW-846 Method 3050B/6010 D

207 802 1.61 09-12-24, 14:53

PLANT AVAILABLE NITROGEN calculation 420 1626 3.3 09-24-24, 17:40

CERTIFICATE OF ANALYSIS

BARTLETT & WEST

Re: CaSi File/Case/Log: 1324/243729-3736/5171 Sludge Sample Collected: 09-09-24, 12:00 September 30, 2024 Sludge Sample Received: 09-09-24, 15:25 Page 2

PARAMETER METHOD

WET WEIGHT

CFU/g

DRY WEIGHT

CFU/g

ANALYSIS

DATE/TIME

FECAL COLIFORM

Geometric Mean of 7 Samples

SM 9222 D <534 2070 09-10-24, 16:10

PARAMETER METHOD PERCENT

ANALYSIS

DATE/TIME

PERCENT SOLIDS SM 2540 B 25.8 09-10-24, 11:44

VOLATILE PERCENT OF

SOLIDS

calculation 15.9 09-11-24, 16:00

PERCENT ASH SM 2540 E 21.7 09-11-24, 16:00

Laboratory analyses were performed on samples utilizing procedures published in Title 40 of the Code of Federal Regulations, Parts 136 or 141, or in EPA Publication SW-846, 3rd edition, September 1986, and the latest promulgated update. Data qualifiers may be appended to this report.

All results are reported on a wet weight basis, unless otherwise noted.

Samples are maintained in the laboratory for fourteen (14) days following issuance of the final report, unless an alternate arrangement is agreed to in writing. All samples determined to be hazardous, or which may not be disposed to the publicly owned treatment works (POTW) or to the sanitary landfill, will be returned to you for proper disposal.

APPENDIX E

PROPOSED GRADING PLAN

1011 1012

101310

NOTES:

1. LAGOON CLOSURE SHALL OCCUR AFTER COLLECTION SYSTEM

IMPROVEMENTS ARE CONSTRUCTED AND APPROVED.

LAGOON CLOSURE WORK MUST MEET ALL REQUIREMENTS OF

SPECIFICATION SECTION 31 23 20. ACHIEVE FINAL GRADES

IMMEDIATELY PRIOR TO SEEDING AND MULCHING. SEE THE

SPECIFICATION SECTION 32 92 19 FOR REQUIREMENTS FOR

SEEDING AND MULCHING. GRADING WORK SHALL BE

COORDINATED WITH PROPER SEEDING SCHEDULES SO THAT

SEEDING AND MULCHING OCCURS IMMEDIATELY AFTER

FINAL GRADING.

2. ALL EARTHWORK, AND POTENTIAL ROCK REMOVAL SHALL

FOLLOW SPECIFICATION SECTION 31 00 00.

3. WITH THE EXCEPTION OF ANY RIPRAP OR ROCK FILL THAT IS

BELOW PROPOSED COLLECTION SYSTEM IMPROVEMENTS,

STORM SEWERS, OR ACCESS DRIVES, EXISTING RIPRAP AND

ANY ROCK FILL ENCOUNTERED IN THE BERMS SHALL BE

BURIED ON-SITE.

4. CONTRACTOR SHALL REMOVE ALL EXISTING LAGOON PIPING

WHEN COMPLETING THE LAGOON CLOSURE WORK.

5. FINISHED GRADING AS SHOWN IS ESTIMATED TO HAVE A

NET CUT. HOWEVER, THE QUANTITIES CALCULATED ARE

"RAW" QUANTITIES WITHOUT CONSIDERATION OF

SHRINKAGE AND SWELL FACTORS, COMPACTION, PROPOSED

PIPING AND STRUCTURES, TOPSOIL, OR ANY POSSIBLE

UNFORESEEN UNSUITABLE MATERIALS. IN ADDITION, THE

BOTTOM OF THE LAGOON CELLS WERE ESTIMATED AND MAY

BE DIFFERENT THAN WHAT IS SHOWN BY EXISTING

CONTOURS. THE CONTRACTOR SHALL VERIFY THE TOTAL

DEPTHS OF EACH CELL AND IS ALLOWED TO ADJUST THE

FINAL GRADING OF THE LAGOON CLOSURE AREAS TO ARRIVE

AT A BALANCED SITE WITHIN THE FOLLOWING PARAMETERS:

THE PERIMETERS OF THE LAGOON CLOSURE GRADING PLAN

SHALL REMAIN UNCHANGED FROM THIS PLAN SHEET, THE

SLOPES SHALL NOT EXCEED 5:1, AND THE GENERAL FLOW

PATHS FROM THE LAGOON SITES AFTER CLOSURE AND

GRADING WORK SHALL REMAIN UNCHANGED FROM THOSE

INDICATED BY THE NOTES STATING "PROVIDE POSITIVE

DRAINAGE FROM LAGOON CLOSURE SITE." SLOPE SHALL BE

.75% OR GREATER.

6. EARTHWORK QUANTITIES ARE RAW QUANTITIES WITHOUT

CONSIDERATION OF SHRINKAGE AND SWELL FACTORS,

COMPACTION, PROPOSED PIPING AND STRUCTURES,

TOPSOIL, OR ANY POSSIBLE UNFORESEEN UNSUITABLE

MATERIALS. THE CONTRACTOR SHALL BID ACCORDINGLY.

ANY NECESSARY CLEAN FILL SHALL BE TRANSPORTED FROM

OFF-SITE AT NO ADDITIONAL COST TO THE OWNER, RAKED

TO REMOVE AGGREGATE MATERIAL, AND SEEDED AND

MULCHED TO MEET SPECIFICATIONS REQUIREMENTS. CLEAN

FILL MUST MEET REQUIREMENTS OF EARTHWORK

SPECIFICATION.

GENERAL NOTES

0 20' 40'

SCALE: 1"=20'

LAGOON GRADING PLAN

ESTIMATE EARTHWORK

CUT 787 CY

FILL 722 CY

NET CUT: 65 CY

PROVIDE POSITIVE

DRAINAGE FROM

LAGOON CLOSURE SITE

DA

TE

DE

SC

RI

PT

IO

N

AL

L

RI

GH

TS

R

ES

ER

VE

D.

A

LL

B

AR

TL

ET

T

W

ES

T

PL

AN

S, S

PE

CI

FI

CA

TI

ON

S

AN

D

DR

AW

IN

GS

A

RE

P

RO

TE

CT

ED

U

ND

ER

C

OP

YR

IG

HT

L

AW

, A

ND

N

O

PA

RT

M

AY

B

E

CO

PI

ED

, R

EP

RO

DU

CE

D, D

IS

PL

AY

ED

P

UB

LI

CL

Y, U

SE

D

TO

C

RE

AT

E

DE

RI

VA

TI

VE

S, D

IS

TR

IB

UT

ED

, S

TO

RE

D

IN

A

R

ET

RI

EV

AL

S

YS

TE

M O

R

TR

AN

SM

IT

TE

D

IN

A

NY

F

OR

M B

Y

AN

Y M

EA

NS

W

IT

HO

UT

P

RI

OR

W

RI

TT

EN

P

ER

M

IS

SI

ON

O

F

BA

RT

LE

TT

W

ES

T.

BY

La st e di t o n:

/1

9/

:3

AM

b y:

K

AK

DRAWING NO:

APPROVED BY:

DRAWN BY:

DESIGN PROJ:

DATE:

SHEET NO:

Dr aw in g

Na m e:

W

Pr oj \2

\2

\2

.1

\A ut oC ad

\P la n Se t\2

.1

C_

Pl an

.d w g L ay ou t N am e:

P

LA

N

P lo tte d By

: K

AK

Pl ot te d on

: 9 /1

9/

2:

:4

PM

of

1"BAR IS ONE INCH ON OFFICIAL DRAWINGS. IF NOT ONE INCH, ADJUST SCALE ACCORDINGLY.0 w w w .b ar tl et tw es t.

co m

KAK

KAK

KJL

21321.101

OCTOBER 2024

C-101 1 1

DESIGNED BY:

----SEALED DATE:

NOT

FO

R C

ONST

RUCTI

ON

LA

G

O O

N G

R A

D

IN

G P

LA

N

C A

SC

O

C

IV

IL

ST

O

C K

TO

N

M O

D O

T M

A

IN

TA

N

A N

C E

IM

R

PO

VE

M

EN

TS

ST

O C

K

TO

N , M

IS

SO

U R

I C

E R

T

IF

IC

A

T E

O F

A U

T H

O R

IT

Y

N O

. 0

- E N

G

IN

E E

R

IN

G

M O

N R

O E

S T

R E

E T

S

U

IT

E

JE

FF

E R

S O

N C

IT

Y

M O

.3

P H

O N

E

.6

.3

APPENDIX F

DRAFT SEWER COLLECTION IMPROVEMENT PLANS

© 2024 Microsoft Corporation © 2024 Maxar ©CNES (2024) Distribution Airbus DS © 2024 TomTom

COVER

TABLE OF ABBREVIATIONS

NOTE: NOT ALL ABBREVIATIONS USED

LEGEND OF SYMBOLS

EXISTING PROPOSED

PERTINENT INFORMATION

SHEET INDEX

PROJECT CONTACTS

MODOT SANITARY SEWER & WATER MAIN

EXTENSIONS

STOCKTON MODOT MAINTENANCE SHED

CIVIL CONSTRUCTION DOCUMENTS

A TRACT OF LAND BEING LOCATED IN THE NORTHWEST QUARTER (NW 1/4) OF

THE SOUTHEAST QUARTER (SE 1/4) OF SECTION SEVEN (7), TOWNSHIP

THIRTY-FOUR (34) NORTH, RANGE TWENTY-SIX (26) WEST OF THE 5TH P.M.

CITY OF STOCKTON, CEDAR COUNTY, MISSOURI

FLOOD ZONE NOTE

SURVEY NOTE

BENCHMARK NOTE

CONSTRUCTION NOTES

GENERAL NOTES

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa ny

L

K J

I

G

H

F E

D C

B A

L

K J I

G

H

F E D C

B A

SANITARY & WATER

EXTENSION MASTER

VIEW

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa

KEY MAP

A

EX A

B C D E

A B

C

D E

SANITARY & WATER

SERVICE

EXTENSION PLAN

AND PROFILE

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa ny

PROFILE SCALE:

NOTE PAVEMENT LEGENDNOTESEROSION AND SEDIMENT CONTROL NOTES PROFILE LEGEND

H

G

F

F HG

PROFILE SCALE: SANITARY & WATER

SERVICE

EXTENSION PLAN

AND PROFILE

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa

NOTE PAVEMENT LEGENDNOTESEROSION AND SEDIMENT CONTROL NOTES PROFILE LEGEND

I J

I J

NOTE

PROFILE SCALE:

PAVEMENT LEGENDNOTESEROSION AND SEDIMENT CONTROL NOTES

SANITARY & WATER

SERVICE

EXTENSION PLAN

AND PROFILE

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa

PROFILE LEGEND

NOTE

PROFILE SCALE:

PAVEMENT LEGEND

NOTESEROSION AND SEDIMENT CONTROL NOTES

SANITARY & WATER

SERVICE

EXTENSION PLAN

AND PROFILE

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa

PROFILE LEGEND

L

K L

L

NOTEPAVEMENT LEGEND EROSION AND SEDIMENT CONTROL NOTES

MODOT FACILITY

CONNECTION PLAN

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa ny

PROFILE LEGEND NOTES

SEWER CLEANOUT

MANHOLE L PLAN VIEW CONNECTION DETAIL

CONSTRUCTION

DETAILS

CO

N

ST

R.

D O

C.

R

EV

IS

IO

N S

N o.

PROFESSIONAL OF RECORD

CASCO DIVERSIFIED CORPORATION

CERTIFICATE OF AUTHORITY - ENGINEERING

#000613 12/31/25

Permit Date Bid Date

Project Number Drawn By/Checked By:

2403961

MW/SBF

Da te

De sc rip tio n

Sarah Bax Fonda License NO. PE-2021001024

Expiration Date 12/31/25

05-30-24

M O

DO

T

SA

N

IT

AR

Y

SE

W

ER

W

AT

ER

M

AI

N E

XT

EN

SI

O

N S

ST

O

CK

TO

N M

O

DO

T M

AI

N

TE

N

AN

CE

S H

ED

EA

ST

S

TA

TE

H

IG

H

W

AY

N

ST

O

CK

TO

N

, M O

S un ne n Dr iv e, S ui te

, S t.

Lo ui s, M O

T:

.8

.1

A

CA

SC

O

D iv er sif ie d

Co rp or at io n

Co m pa

NOTES

APPENDIX G

TECHNICAL SPECIFICATION FOR LAGOON CLOSURE

TECHNICAL SPECIFICATIONS

FOR

CASCO CIVIL – STOCKTON MODOT MAINTENANCE FACILITY

LAGOON CLOSURE

CEDAR COUNTY, MISSOURI

KYLE J. LANDWEHR – PROFESSIONAL ENGINEER

LICENSE NO. PE-2023000495

BARTLETT & WEST, INC.

MISSOURI CERTIFICATE OF AUTHORITY NO. 000167-ENGINEERING

601 Monroe Street, Suite 201

Jefferson City, MO 65101

(573) 634-3181

PROJECT NO. 21321.101

DATE PREPARED: OCTOBER 2024

021321.101 / 021321.101

CASCO Civil Lagoon Closure

310000 - 1 EARTHWORK

PART 1 GENERAL

1.01 WORK INCLUDED

SECTION 310000

EARTHWORK

A. This section includes the site preparation activities and defines certain items and aspects of earthwork relative to other work.

B. Provide all operations necessary to complete site clearing, stockpiling, dewatering, excavations, embankments and backfilling, subgrade preparation, placement of topsoil, and finished grading.

C. Construct and maintain all temporary drainage swales, berms and diversions; furnish, operate, and maintain all necessary pumping and other equipment for dewatering. After above items serve their purpose, remove them and restore site.

1.02 GENERAL

A. Definition: Earthwork is defined as all excavation, trenching, fill, backfill, site preparation, subgrade preparation and other appurtenant work.

B. Classification: Excavation shall be unclassified, and the term "excavation" shall include all material encountered without regard to its physical properties, characteristics or composition.

C. Limits of the Work:

1. Earthwork shall not extend beyond the areas of excavation, embankment or other construction shown on the drawings.

2. Excavations for new construction shall not undercut existing footings and foundations.

D. Safety and Protection:

1. Shoring, sheeting and bracing shall be provided as required to protect the work and workmen from damage or injury by caving or sloughing.

2. Laws and ordinances regulating health and safety measures shall be strictly observed.

E. Blasting: Blasting will not be permitted.

1.03 REFERENCES

A. American Society for Testing and Materials (ASTM):

1. D 698 Moisture-Density Relations of Soils Using 5.5 lb. (2.5 kg) Rammer and a 12 inch (304.8 mm) Drop.

2. D 2922 Test Methods for Density of Soil and Soil Aggregate In Place by Nuclear

Methods (Shallow Depth).

3. D4318 Test Methods for Liquid Limit, Plastic Limit and Plasticity Index of Soils.

4. D4546 Test Method for One-Dimensional Swell/Settlement Potential of Cohesive Soils.

B. American Association of State Highway and Transportation Officials (AASHTO):

1. M6 Fine Aggregate for Portland Cement Concrete.

2. T99 Moisture Density Relations of Soils, Using a 5.5 lb. (2.5 kg) Rammer and a 12 inch (305 mm) Drop.

C. Military Standard (MIL-STD-619):

1. MIL-STD-619B Unified Soil Classification System for Roads, Airfields, Embankments and Foundations.

D. Missouri Department of Transportation (MoDOT):

1. 2024 Edition Standard Specifications for Highway Construction.

E. Federal Register - Occupational Safety and Health Administration (OSHA)

1. 29CFR Part 1926 Occupation Safety and Health Standards - Excavations.

F. Department of the Army, Kansas City District, Corps of Engineers:

310000 - 2 EARTHWORK

1. Guidebook General information for sponsors of flood protection projects constructed by the Corps of Engineers.

1.04 SUBMITTALS

A. Submit shop drawings and submittals in accordance with the project’s submittal requirements.

B. Bedding and Backfill Materials: The Contractor shall notify the Engineer of the off-site sources of bedding and backfill materials and submit to the Engineer detailed information of the materials to be used including but not limited to a sieve analysis and Standard Proctor Curve.

C. Density test results as required by this specification.

1.05 QUALITY CONTROL

A. Prior to the placement of any excavated or borrowed soils, each type of soil approved for fill or backfill shall have a Standard Proctor Curve developed to indicate the moisture-density relationship required to obtain maximum density.

B. Compaction Testing:

1. Sample backfill materials for the density testing shall be taken according to ASTM D75.

2. Compaction is the calculated ratio of the in-place (dry) density to the laboratory maximum (dry) density expressed as a percentage.

3. Determine laboratory moisture-density relations of soils according to the ASTM test method identified in the specific subsection.

4. The following table identifies the compaction required based on the location of the soil:

LOCATION COMPACTION DENSITY

Under paved areas, sidewalks and piping 90% of ASTM D 1557 or 95% of ASTM

D698

Unpaved areas 85% of ASTM D698

Inside of structures under foundations, under equipment support pads, under slabs-on-grade and scarified existing subgrade under fill material

90% of ASTM D1557 or 95% of ASTM

Outside structures next to walls, piers, columns and any other structure exterior members

90% of ASTM D1557 or 85% of ASTM

Outside structures under equipment support foundations *

95% of ASTM D1557 or 100% of ASTM

Granular fill under base slabs and building floor slabs on grade

75% relative density per ASTM D4253 and

ASTM D4254

Structural fill for over excavations 90% of ASTM D1557 or 95% of ASTM

*Granular fill or flowable fill may be substituted

310000 - 3 EARTHWORK

C. Density tests shall be taken at the frequency indicated in the table below and at all road and street crossings. The Engineer has the authority to require the Contractor to perform additional test locations based upon field conditions. The Engineer shall determine the exact location of all tests. Field tests for density and moisture content performed by the Contractor are for the sole purpose of assisting the Engineer in determining that the specified density is being obtained. All density testing for all backfill shall be performed using Standard Soil Proctor Curves provided by the Contractor. The Engineer has the authority and right to not accept backfill based on the results of these tests, but the results of the tests do not waive the responsibilities of the Contractor to ultimately guarantee the density and stability of the fill material. When test results indicate that compaction is not as specified, the material shall be removed, replaced, and recompacted to meet specification requirements at no expense to the Owner. Subsequent tests on recompacted areas shall be performed to determine conformance with specification requirements at the Contractor’s expense.

Materials Minimum Test Frequency

Fill and Backfill 1 per lift per 500 square feet

Subgrade 1 per lift per 2,500 square feet

Embankment 1 per lift per 500 cubic yards

Trenches 1 per lift per 150 linear feet

In no case shall the frequency exceed 200 feet horizontal and 1-foot vertical intervals.

D. Degree of compaction is a percentage of the maximum density obtained by the test procedure presented in ASTM Method D 698 or AASHTO-T99 (Standard Proctor) as a percent of laboratory maximum density.

E. Compaction Methods

1. Obtain compaction of backfill and embankment by mechanical means. Jetting or flooding is not permitted. Compact each layer with mechanical tampers. Do not place backfill at hydraulic structures until hydraulic testing has been completed. Do not place backfill against cantilevered walls until design strength of concrete has been reached. Do not place backfill against walls supported at the top by floor slabs until design strength has been reached.

2. Use light vibratory or hand tamping equipment adjacent to the wall. Take particular care compacting around pipe spools. Do not use heavy compaction equipment within a horizontal distance from the wall equal to the height of the wall.

1.06 SUBSURFACE INFORMATION

A. Unclassified.

1.07 PROTECTION AND REMOVAL OF UTILITY LINES

A. The presence of utilities is not guaranteed to be shown accurately or completely. On-site verification of utilities is required by the Contractor prior to excavations. Existing pipelines and electric cables that are shown on the Drawings or the locations of which are made known to the Contractor during on-site investigations prior to excavation operations, shall be protected from damage during excavation and backfilling, and if damaged shall be repaired by the Utility company at Contractor's expense.

PART 2 PRODUCTS

2.01 EARTH FILL MATERIALS

A. Fill material used for compacted impervious material shall consist of excess suitable impervious material obtained from on-site suitable excavations or suitable imported clay or silt material. Excess suitable material obtained from structure and trench excavation shall be used for the construction of fills and embankments. Additional material shall be provided as required under sub-section 2.03 - Borrow Material.

B. All material placed in fills and embankments shall be free from rocks, stones, or shale particles larger than 2 inches, frozen matter, brush, stumps, vegetation, logs, roots, debris, and organic

310000 - 4 EARTHWORK

or other deleterious materials. The material for fill shall have a liquid limit less than 45 percent and a plasticity index less than 25 as determined by ASTM D4318. No rocks or stones shall be placed in the upper 18 inches of any fill or embankment. Rocks or stones within the allowable size limit, incorporated in the remainder of fills and embankments, shall be distributed so that they do not congregate or interfere with proper compaction.

C. Fill material shall be limited to materials classified as SC, ML, and CL by the Unified Soils Classification.

D. Moisture content is to be maintained at a level sufficient to obtain the specified compaction.

2.02 EXCAVATED MATERIALS

A. Topsoil obtained by stripping and suitable for finish grading where arable soil is required shall be stockpiled in a location approved by the Owner or Engineer.

B. Excavated material approved for embankment, fill or backfill shall be placed in areas receiving embankment or stored for future use in a location approved by the Owner or Engineer.

2.03 BORROW MATERIAL

A. Where suitable materials, including topsoil, are not available in sufficient quantity from all required excavations under this contract, approved materials shall be obtained from approved sources off site at the Contractor's responsibility and expense. The necessary clearing and grubbing of borrow areas, disposal and removing of debris therefrom, the developing of sources including any access roads for hauling, the necessary right-of-way, and the satisfactory drainage of the borrow areas shall be considered as incidental items to borrow excavation.

B. Material obtained for fill shall be approved by the Engineer. Fill material shall be limited to materials specified in Section 2.01 - Earth Fill Materials.

2.04 TOPSOIL

A. Topsoil shall be the top few inches of field or pasture loam having a good supply of humus along with a high degree of fertility. Acceptable topsoil shall be a fertile, friable, and loamy soil of uniform quality with a loose crumbly structure, free from materials such as roots, hard clods, stiff clay, fill material, stone with any dimension greater than 1 inch, and similar impurities, relatively free from grass, roots, weeds, and other objectionable plant material.

B. Soils from ditch bottoms, drained ponds or eroded areas are not acceptable. Soils supporting growth of noxious weeds or undesirable weeds are not acceptable. Topsoil handled too wet or soggy are unacceptable.

2.05 DISPOSAL OF UNSUITABLE OR EXCESS MATERIAL

A. See construction plan notes for requirements for disposal of excess material.

2.06 CAPILLARY WATER BARRIER

A. Aggregate shall be clean, crushed, nonporous rock as graded below or sand-gravel:

1. Crushed, nonporous rock maximum particle size shall be ¾ inch and no particles shall be small enough to pass a No. 4 sieve.

2.07 BUILDING BACKFILL

A. Backfill within building shall be limited to materials classified as sc, ml and cl by mil-std-619.

PART 3 EXECUTION

3.01 SITE PREPARATION

A. Clearing and Grubbing:

1. The site of the work shall be cleared of all trash and debris which may be found on the site.

2. Grass and weeds shall be mowed to a height of not more than three inches and raked into windrows or piles.

310000 - 5 EARTHWORK

3. Trees noted to be removed shall be removed to a minimum depth of 2 feet 0 inches below the surface of the finished grade.

4. All materials accumulated by clearing and grubbing operations shall be disposed of at an offsite location to be provided by the Contractor.

B. Stripping:

1. Strip topsoil to a depth of not less than four inches from all areas to be covered by buildings, pavement, curb and gutter or other construction.

2. Material obtained by stripping shall be stockpiled for use in finish grading or areas not covered by construction.

3.02 ROCK EXCAVATION

A. The use of explosives is not permissible on this project

B. Excavation is considered unclassified for this project and the Contractor shall bid accordingly

3.03 EMBANKMENTS

A. Place all embankments to lines and grades shown. Areas to be covered with topsoil shall be underfilled so the finished lines conform after topsoil placement. Protect and maintain embankments during the course of construction. Replace all materials lost due to storm damage until permanent stabilization. Use materials obtained during excavation or imported materials. Do not use brush, sod, or other unsuitable materials in embankments.

B. No embankment shall be constructed on frozen material, nor shall organic material be used for embankment.

C. When an embankment is to be placed against a hillside or existing embankment whose slopes are steeper than 4:1; the existing slope shall be continuously benched in approximately 24 inches rises as the new fill is brought up on lifts as specified below. The material bladed out, the bottom of the area cut into, and the embankment material being placed shall be compacted to the required density.

D. In fill sections, place material in loose lifts not exceeding [6 inches], brought to within 2% to

+4% of optimum moisture content. Bring up each lift uniformly over the entire area being filled and compact each lift to its required density.

E. Maintain the proper moisture content in the uppermost layer. If placing of materials is interrupted and the material dries, bring to proper moisture content before resuming by sprinkling, cultivating, and rolling to the required compaction. Do not place or roll material during rainfall of sufficient intensity to materially increase the moisture content. If any material placed in embankment acquires a greater moisture content than is suitable for compaction, allow to dry or remove. If removed, recondition the new surface before placing new material.

Repair any irregularities caused by erosion by excavating, cultivating, filling, and compacting.

3.04 EXCAVATION FOR STRUCTURES

A. Structural excavation is the removal of all materials of whatever nature to approved structural subgrade and as necessary for construction of structures and foundations. Approved structural subgrade is that material which has been observed by the Engineer and upon which structural foundations or other materials may be placed. Locate limits of excavation for structures with formed vertical surfaces at least 5 feet from the extreme outside of the structure to the toe of the cut slope or at a 1:1 slope as detailed on the drawings, whichever is greater.

B. Design excavations in the proximity of adjacent structures so as to protect the structures from damage or undermining. Design and install shoring if necessary. Side slopes of excavation shall be only as steep as is safe for material to stand. Avoid unnecessary disturbance of adjacent ground.

C. Subgrade Preparation

1. Remove all existing “fill”, loose natural clays, sand, and compressible materials under proposed structures. Provide a relatively smooth subgrade.

2. The exposed bottoms of excavations shall consist of undisturbed native material.

310000 - 6 EARTHWORK

3. Where excavation is inadvertently carried beyond the design elevation or approved structural subgrade, adjust the construction as directed to meet the structural requirements. Over excavations shall be backfilled with graded structural fill compacted to the required density, or adjust the construction as required to meet the structural requirements as approved by the Owner’s Representative.

3.05 FILL WITHIN STRUCTURES

A. Approved fill shall be placed at optimum moisture content in lifts of not more than 6 inches loose lift and compacted to at least 95 percent of Laboratory Maximum Density. Fill shall be placed up to the bottom of the structural floor slabs, with allowance for capillary water barrier (gravel sub-base) and/or concrete mud mat as specified or shown on the drawings, to the elevations shown.

3.06 CAPILLARY WATER BARRIER

A. Subgrade under floor slab shall be finished off smooth after the required density as specified above is achieved to the proper elevation.

B. Capillary water barrier shall be placed directly on the subgrade and compacted with a minimum of two passes of a plate-type vibratory compactor.

C. The minimum compacted thickness of the capillary water barrier shall be 4-inches unless noted otherwise in the Drawings.

3.07 BACKFILL FOR STRUCTURE FOUNDATION WALLS, GRADE BEAMS AND FOOTINGS

A. Backfill shall be brought up on each side of the foundation wall concurrently. After foundation walls, grade beams and footings have cured, forms have been removed, and all trash has been removed, backfill shall be placed at optimum moisture content in lifts of not more than 6 inches loose lifts and compacted to at least 95 percent of Laboratory Maximum Density.

B. Backfill for areas not to be paved shall be placed to within 6 inches of the finished grade. The top 6 inches shall be topsoil.

3.08 AREA GRADING

A. Under pavement, pads and sidewalks, excavate and fill to grades and contours shown on the

Drawings, making allowance for thickness of pavement, pads and sidewalks.

B. General Fill:

1. Excavate and fill to grades and contours shown on the Drawings making allowance for the placing of a minimum of 6 inches of topsoil.

2. Areas receiving embankment or topsoil shall be scarified to a depth of 6 inches and recompacted at optimum moisture content to at least 90 percent of Laboratory Maximum Density.

3. Fill material shall be approved earth free of stones larger than 6 inches diameter and suitable for compaction. Fill material shall be placed at optimum moisture content in lifts not to exceed 6 inches loose lift and compacted to at least 90 percent of Laboratory Maximum Density.

4. Topsoil shall be placed in a 6 inch lift and not compacted.

3.09 SUBGRADE PREPARATION FOR PAVEMENT, PADS, SIDEWALKS AND CURBS

A. Subgrade preparation shall extend one (1) foot beyond the back of curb line or edge of pavement, whichever is appropriate. Sidewalk replacement subgrade preparation shall be limited to width of sidewalk and form limits.

B. The subgrade shall be free of organic material, trash and debris, and rocks larger than 3 inches in diameter. Subgrade shall not be frozen while construction is in progress.

C. Scarify the upper six (6) inches of the subgrade and compact to 95% of the maximum density at optimum moisture, plus or minus 3%, in accordance with AASHTO T99 (Standard Proctor).

The subgrade material shall be properly “worked” and installed to provide a stable road base, absent of shrinkage or swell potential. The subgrade shall be maintained within the proper

310000 - 7 EARTHWORK

moisture content limits until the curb & gutter and pavement is placed. Mechanical tamping may be utilized or required for certain areas. If the subgrade contains excess moisture the subgrade shall be aerated or removed and replaced with new material so that moisture limits fall within limits of the standard proctor. The prepared subgrade shall support the weight of vehicles and equipment without producing ruts in the surface, and shall be maintained until pavement has been placed thereon. The Engineer may require proof rolling of the subgrade surface. Proof rolling shall be provided at no additional cost to the Owner.

D. The elevations and cross sections of the subgrade surface shall be thoroughly checked immediately prior to the pavement placement. All high and low places shall be removed and filled with suitable material and mechanically tamped. All subgrades shall be checked not less than 100 feet in advance of paving operation. Any damage or irregularities to the subgrade during paving operations shall be repaired prior to placing of additional pavement.

3.10 CONTROL OF WATER

A. Surface Water:

1. Surface water shall be diverted to prevent entry to trenches and excavations for structures.

2. In the event surface water does accumulate in trenches and other excavations, the excavations shall be dewatered as necessary to permit the proper execution of the work.

Dewatering shall be provided at no additional cost to the Owner.

B. Ground Water: Where ground water is encountered, trenches and other excavations shall be dewatered as necessary to permit the proper execution of the work.

1. The Contractor shall provide pumps, well points, and other appurtenant equipment necessary to remove and maintain water at such a level as to permit construction in a dry condition as specified except where authorized tremie concrete construction Work is shown or permitted. The groundwater level shall be controlled so as to permit the placing of sewer lines and structure foundations, curing of concrete, and the maintenance of supporting foundations and adjacent Work and structures. The dewatering system and points of discharge shall be subject to permitting, reviews, and acceptance by the Engineer before installation. Disposal of water to any surface water body will require silt screens.

2. The Contractor shall use dewatering systems that include automatic starting devices, and standby pumps that will ensure continuous dewatering in the event of an outage of one or more pumps. He shall be totally responsible for protecting structures from flotation until final acceptance of the Work. The Contractor shall also modify the dewatering system during the course of construction to satisfy faults, legitimate complaints, or legal requirements.

3.11 FINISH GRADING

A. After construction is completed, areas requiring finish grading shall be cleared of all building materials, equipment and debris and a minimum depth of 6 inches of topsoil placed. The 6 inches of topsoil is included in and not added to the final grade indicated on the plans.

Surfaces shall be smooth and suitable for planting or sodding.

3.12 PROTECTION

A. Subgrade shall be repaired from action of the elements or others. Any settlement or erosion that occurs prior to the placing of the pavement thereon, shall be repaired and the specific lines, grades and cross section re-established. Any subgrade that has become unacceptable shall be reworked as necessary to restore the subgrade to shape, tolerance, density, and moisture content range for such density, immediately prior to the placing of the pavement.

The Contractor shall protect all existing improvements from damage resulting from his subgrade operation. Any improvements damaged shall be repaired or replaced at no additional expense to the Owner.

END OF SECTION

312320 - 1 BIOSOLIDS REMOVAL

SECTION 312320

LAGOON CLOSURE

PART 1 GENERAL

1.01 RELATED WORK SPECIFIED ELSEWHERE

A. 310000 Earthwork

B. 329219 Seeding

1.02 REFERENCES

A. State of Missouri:

1. University of Missouri Extension Water Quality Guide Sheets for Biosolids – WQ 423 through 434 and WQ 449.

2. Missouri Clean Water Law

3. Missouri Clean Water Commission Rules

4. Missouri Department of Natural Resources Wastewater Treatment Plant Closure Fact Sheet - PUB2568

5. Standard Conditions for NPDES Permits issued by MDNR Missouri Clean Water Commission Part III, revised August 1, 2019

B. United States Environmental Protection Agency (EPA), 40 CFR Part 503

C. NPDES Permits issued for the lagoon facility.

1.03 GENERAL

A. Definitions:

1. Lagoon closure is defined as all work necessary to properly remove wastewater biosolids from the existing lagoon cell or incorporate biosolids into soil following reference guidance and perform all regulatory paperwork submittals and documentation.

B. Based on the lagoon closure plan information, biosolids shall be mixed with soil at a 1:1 ratio by The Contractor shall land-apply wastewater biosolids at the appropriate agronomic rates in a manner acceptable to the Missouri Department of Natural Resources (MDNR) and in accordance with state and federal laws and regulations.

C. Laws and ordinances regulating water pollution control, health and safety measures shall be strictly observed.

1.04 PROTECTION OF UTILITY LINES

A. Existing utilities including pipelines and/or electric cables shall be protected from damage during the work, and if damaged shall be repaired by the Contractor or Utility company at Contractor's expense.

PART 2 PRODUCTS (NOT USED)

PART 3 EXECUTION

3.01 GENERAL

A. The biosolids shall be shall be incorporated with soil from the lagoon berms as indicated in the lagoon closure plan and in accordance with Missouri Department of Natural Resources publication 2568 and Standard Conditions for NPDES Permits issued by MDNR Missouri Clean Water Commission Part III, revised August 1, 2019.

B. Biosolids shall be contained within the lagoon regrading site. The contractor shall ensure than no biosolids leave the site. As indicated in the proposed grading plan, final contours may be adjusted to arrive at a balanced site depending on actual swell and shrinkage factors experienced during construction. If the biosolids are not contained within the boundaries of the approved site, the Contractor shall be responsible for all costs of clean up and remediation.

3.02 PERMITTING AND SEQUENCE OF WORK

A. Contractor shall follow sequence of work and construction schedule submittal requirements of the project’s specifications.

312320 - 2 BIOSOLIDS REMOVAL

B. Note that it shall be the contractor’s full responsibility to comply with all state and federal regulations, which includes paperwork and documentation. The Contractor shall be fully responsible for any fines incurred. If fines are assessed to the City as the result of failure to receive adequate approval from MDNR or other applicable regulatory authorities, the Contractor shall be fully financially liable for paying those fines on behalf of the Owner. This section shall not be considered all-inclusive, but rather a guidance that must be addressed at a minimum. The general permitting and work sequence follows:

1.