329119_PLANTING_SOIL_SYSTEM_INSTALLATION_CAR_2015_2_BID_revised_2014_06_23.pdf

Confident

JEFF - 18

031814

SECTION

PART 1

1.1 SU

A. T

1.2 R

A. T

B. T

1.3 R

A. A tial and Propr

81202

N 32 91 19 – P

GENERAL

UMMARY

This section in and equipme Documents. S

. Install the Go

. Coord manuf

. Sampl

. Record

. Coord

RELATED SE

The following Specification

. 31 10

. 31 20

. 31 34

. 32 84

. 32 92

. 32 93

. 32 93

. 33 41

. 33 46

The following supplemental

. 32 91

REFERENCE

All standards s bids. For ea rietary Inform

PLANTING

ncludes furnis nt for Plantin Such work sh

Planting Soi overnment’s S ination with factured soil m ling and Testi d-keeping Lo ination with o

ECTIONS

g items of r ns:

00 “Site Prep

00 “Earthwo

19 “Reinforc

00 “Landsca

00 “Lawn”

00 “Planting

10 “Liquid B

00 “Storm Ut

00 “Aeration g item of rel l information

13 “Planting

STANDARD

shall include ach type of mation

SOIL SYSTE

shing all labo ng Soil install hall include bu il Profiles com Soil Blending the Governm materials, furn ing for specifi g.

other trades.

related work paration, Salv ork” ed Slope Syst ape Irrigation” g and Fine Gra

Biological Am tility Drainag

System.”

lated work i for the Contr

Soil System-

DS FOR ANA

the latest edit packaged ma

PLANTING

EM - INSTAL

or, tools, mate ation, or as m ut is not limit mposed of P g Contractor.

ment’s Blend nished by the fication confor are specifie vage, and Cle tem (RSS)” ading” mendment” (N ge Piping.”

s listed in S ractors referen

Blending”

ALYSIS AND

tions and ame aterial requir

SOIL SYSTE

LLATION

erials (exclud may be reason ted to the foll lanting Soil M ding Contract Government rmance.

ed and inclu aring”

NOT IN CON

Section 01 1 nce:

D TESTING

endments as red for the w

EM - INSTA

ding planting nably inferred owing:

Mixes that w tor for the su t.

uded in othe

NTRACT)

1 00 “Summ of the date of work of this

Contra

32 91 19-1

ALLATION

soil mix mat d from the Co will be provid upply of imp er Sections o mary of Wor f advertiseme s Section, pr act #2 terial) ontract ded by ported of the rk” as ent for rovide

Confidential and Proprietary Information Contract #2

JEFF - 181202 32 91 19-2

031814 PLANTING SOIL SYSTEM - INSTALLATION

manufacturer’s certified analysis. For all other materials, provide complete analysis by a recognized laboratory made in strict compliance with the standards and procedures of the following:

1. American Society for Testing Material (ASTM)

2. American Society of Agronomy

3. Soil Science Society of America

1.4 DEFINITIONS

A. Compaction: Compaction is the comparison of the physical qualities of a soil in its “at rest” (uncompacted) state verses its state after forces have been applied to the soil. Compaction results in a denser packing arrangement of soil particles that result in a reduction of porosity, an increase in bulk density, and a decrease in soil hydrologic conductivity. Over-compaction of soil is the condition where the soil porosity is reduced below 40% pore space, the bulk density exceeds 1.4 g/cc, and hydraulic conductivity is above 1.

B. Dry Soil: The condition of the soil at or below the wilting point of plant available water in which the soil is powdery and subject to blowing.

C. Frozen Soil: The point at which the soil water has frozen and the soil has become very hard and cloddy. Ice crystals can be seen in the pore spaces of the soil.

D. Field Capacity: The percentage of water remaining in a soil two or three days after having been saturated and after free gravimetric drainage has ceased. Soil that is worked above its field capacity is subject to over-compaction and damage to its structure.

E. Kjeldahl Nitrogen: in chemical soil testing, the sum of organic nitrogen, ammonia (NH3), and ammonium (NH4+)

F. Moist Soil: The condition of the soil in where it can be formed into a ball and maintain its shape.

Deformation of the soil is difficult with hand pressure. Free water is not visible and is usually considered the point between the wilting point and field capacity of the soil.

G. Project: Refers to the Jefferson National Expansion Memorial (JEFF or JNEM) construction site.

The JEFF/JNEM projects are subdivided into five contracts which are individually bid and awarded by the Government.

H. Saturated: All the pore space within a soil is filled with water and the remaining water is under gravitational forces to drain through the profile.

I. Scarification: The loosening of the surface of a soil lift by mechanical or manual means to alleviate crusted, minimal compaction, or smoothed surfaces of the soil. Depth of scarification is dependent on material and extent of compaction. Depths are noted within the specifications.

J. Government’s Soil Blending Contractor: Refers to the Contractors for the Jefferson National Expansion Memorial (JNEM of JEFF) projects who are under separate contract with the Government for supplying the planting soil mixes.

JEFF - 181202 32 91 19-3

K. Subsoil: The soil horizon directly below topsoil that provides water holding and structural support to plants. Source of the majority of micro-nutrients.

L. Subgrade: The in-situ soil material that the planting soil profile will be installed upon.

M. Topsoil: The mineral surface layer of soil that exhibit obliteration of all or much of the original rock structure and must show the following: (1) an accumulation of humified organic matter closely mixed with the mineral fraction and not dominated by properties characteristic of subsurface horizons; (2) has reasonable tilth (biological, chemical and physical properties) to support plant growth; as well as the following qualities:

1. A bulk density of less than 1.4g/cc installed

2. Less than 10 percent by weight coarse fragments greater than 2mm

3. Loose, friable structure (easily broken into crumbs or peds), no massive structure

4. No contamination (e.g.. Toxic weeds, chemicals, heavy metals, construction debris)

N. Wet Soils: Soils that are considered wet will easily be deformed by hand pressure, maintain their shape, and free water will be visible within the pore spaces. The water content at this soil condition is considered at field capacity or wetter.

O. Redoximorphic Features: The iron staining or gray depletion of soil colors due to anaerobic soil conditions in association with a seasonal high water table.

1.5 SUBMITTALS

A. Informational Submittals: In addition to the requirements of Section 01 33 23 “Submittals”, submit the following:

1. In-situ Test Reports: Submit certified reports for tests as described in this Section.

2. Schedule: In addition to the requirements of Section 01 32 16 “Construction Schedule,” the Contractor shall submit a schedule of soil needs within four (4) weeks of the Notice to Proceed, and shall resubmit when the dates change.

3. Planting Soil Mix grab samples collected during installation.

4. Qualification Data: The Contractor shall have at least 2 years’ experience in installing designed soil mixes, completing projects similar in scope, complexity and value.

5. Record-keeping log: Submit to Contracting Officer two times per month.

1.6 QUALITY ASSURANCE

A. Long Lead Time Item: The Contractor is advised that installing planting soil is a CRITICAL PATH item, requiring timely attention to meet the requirements of the Documents and Schedule. The Contractor shall consider this to be A LONG LEAD TIME ITEM.

1. Soil Installation Contractor shall provide a 3 month lead time to the Soil Blending Contractor for initial soil delivery, thirty (30) day anticipated delivery schedule provided monthly, and one (1) week notice for deliveries to the JEFF project site. The Contractor shall be responsible for providing the Government’s Soil Blending Contractor with

JEFF - 181202 32 91 19-4

sufficient time to prepare and deliver the planting soil mixes, on an on-going basis. The Contractor shall provide the Soil Blending Contractor with a three (3) month lead time for initial delivery and weekly updates of required deliveries thereafter.

B. Pre-Installation Conference: In addition to the requirements of Section 01 31 00 “Project Management and Coordination”, a Conference with the Contracting Officer to discuss the work of this Section shall be held prior to beginning the work of this Section.

1. Conference shall also include the Government’s Soil Blending Contractor. Schedule of required planting soil needs shall be discussed.

C. In addition to the requirements of Section 01 40 00 “Quality Requirements”, provide the following:

1. An independent Missouri-certified testing agency with experience and capability to conduct the testing indicated and that specializes in types of tests to be performed. Tests shall be made in strict compliance with, ASTM, and other standards referenced herein.

a. For each in-situ test type, use the same testing agency throughout the work. Notify Contracting Officer of any change in testing agency and do not proceed until Contracting Office has approved the change.

D. Mockups: See Section 32 93 00 “Planting and Fine Grading” for soil mockups.

E. Planting Soil Quality Assurance: Refer to Section 1.7 Testing for additional requirements.

F. Record-keeping Log: Maintain an activity log tracking the following:

1. Planting soil installation activities including date, planting soil mix placed, , approximate quantity, location, and weather (temperature, precipitation, cloud cover).

2. Record of in-situ field testing, including date, type of test, planting soil layer and profile tested, location of test, and weather (temperature, precipitation, cloud cover).

a. For all tests, number each test and indicate locations of tests on a plan of the project site.

G. Record both acceptable and unacceptable findings. Immediately report unacceptable test reports to the Contracting Officer. Submit all test reports to the Contracting Officer.

1.7 TESTING

A. General:

1. Record-keeping Log for Testing: Refer to Article 1.6, E. for requirements.

2. Testing of soil biology and soil chemical properties for the purposes of promoting plant growth shall be required. See Section 32 92 00 “Lawn” and Section 32 93 10 “Liquid Biological Amendment (LBA) (NOT IN CONTRACT).

B. Testing Agency

1. The Testing Agency shall be approved by the Contracting Officer per Section 01 40 00 “Quality Requirements.” The testing agency shall have completed projects similar in size and complexity. The following testing agencies are pre-approved:

JEFF - 181202 32 91 19-5

a. Geotechnology Inc., 11816 Lackland Rd #150, St Louis, MO 63146, 314-241-

b. Shannon and Wilson, Inc., 2043 Westport Center Drive, Saint Louis, MO 63146, 314-699-9660

c. TSi Engineering Inc., 5850 Arsenal St, St Louis, MO 63139, 314-644-3134

C. Testing Definitions and Methods:

1. Grab Samples:

a. A grab sample shall consist of five (5) discrete collections of soil homogenized into the final 1 gallon sample for submittal to the Contracting Officer.

1) Discrete collections of soil shall be a minimum of 25 feet apart.

b. Label each grab sample to identify planting soil mix, date of sample collection, and the location of installation.

2. In Situ Tests

a. Standard Proctor Density Test: Conforming to ASTM D698 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort

b. Density Tests (Compaction):

1) Nuclear Method: ASTM D6938 - 10 Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth).

2) Static Cone Penetrometer, ¾” Tip: ASTM D4429 – Standard Test Method for CBR (California Bearing Ratio) of Soils in Place

c. Infiltration Test: Double ring infiltrometer, falling head, conforming to ASTM D3385-09

1.8 SAMPLING AND TESTING FREQUENCY

A. Grab Samples:

1. Grab sample shall be required during soil installation at the following frequency:

a. Every 1000 cubic yards of each soil mix installed.

2. Contracting Officer will decide when the grab samples need to be tested to assist in evaluating poor soil or plant performance. The Contracting Officer will be responsible for testing. The Government will be responsible for the cost of the testing.

B. In-Situ Testing:

1. Density Testing, Nuclear Method: One (1) test per 22,000 sf (150 ft centers), for each of the following soil horizons:

a. Subgrade.

b. Horticultural Subsoil, or Bioswale Soil 2 (BS2).

c. Tree Soil (TS1), Lawn Soil (LS1), Bioswale Soil (BS1) or Structural Soil.

2. Density Testing, Static Cone Penetrometer: Two (2) tests per 2,500 sf. (50 ft. centers) and at selected locations determined by field personnel. One test shall be at the depth of 0”- 6”, and the second test shall be at the depth of 6”-18”, for each of the following soil horizons.

1.9 A

A. If

PART 2

2.1 SU

A. Su

2.2 L

A. L

B. P

2.3 P

A. P

2.4 C

tial and Propr

81202 a.

b.

. Infiltra horizo a.

b.

ACCEPTANC

f, at any time criteria for d and schedule replacement depending on

PRODUCT

UBGRADE

ubgrade conf

LANDSCAPE

Landscape Un Drainage Pip lanting aerati

LANTING S

lanting Soil Contractor. P Contractor an

. Hortic

. Lawn

. Tree S

. Biosw

. Biosw

. Structu

COMPOST

rietary Inform

Subgrade.

Tree Soil (TS ation Test: O ons:

Subgrade.

Tree Soil (TS

CE

e during the p density or infi e a meeting w of non-comp n the results o

S forming to the

E UNDERDRA

nderdrainage ping.”

on system co

OIL MIXES

Mixes will b Planting Soil nd Contractin cultural Subso

Soil (LS1)

Soil (TS1) wale Soil 1 (BS wale Soil 2 (BS ural Soil (SP4 mation

S1), Lawn So

One (1) test

S1), Lawn So project, place filtration, then with the Cont pliant plantin of the testing a e requirement

AINAGE AN

conforming t nforming to t be provided Mixes will b ng Officer. Pl oil

S1)

S2)

4) oil (LS1), Bios per 40,000 s oil (LS1), Bios ed planting so n the Contrac tracting Offic ng soil shall and site obser ts of Section 3

ND AERATIO

to the require the requireme to the Contr e delivered to lanting soil m

SOIL SYSTE

swale Soil (B sf (200 ft.

swale Soil (B oil does not m ctor shall stop cer. Steps fo be determin rvations.

31 20 00 “Ear

ON SYSTEM

ements of Se ents of Section ractor by the o the Project s mixes to be pro

EM - INSTA

BS1) or Struct centers) of t

BS1) or Struct meet the spec p placement o r amending t ned by the C rthwork.” and

MS

ection 33 41 n 33 46 00 “A e Governmen site to an area ovided includ

Contra

32 91 19-6

ALLATION

tural Soil.

the following tural Soil.

cified perform of all plantin the soil in pla

Contracting O d the Drawing

00 “Storm U

Aeration Syst nt’s Soil Ble a designated b de:

act #2 g soil mance ng soil ace or

Officer gs.

Utility tem.”

ending by the

A. C

2.5 W

A. F

B. T

C. F

2.6 S

A. F

2.7 S

A. R

2.8 S

A. R

PART 3

3.1 P

tial and Propr

81202

Compost will b

. The C

WOVEN FILT

ilter fabric sh

The permeabil ilter fabric s across the we

. Weigh

. Grab T

. Grab E

. Trapez

. Punctu

. Water

. Permit

. A.O.S

. Percen

0. UV Re

EPARATION

ilter fabric sh shall be non-

. Permit

LOPE REINF

Refer to Sectio

OIL AMEND

Refer to Sectio

EXECUTIO

REPARATIO

rietary Inform be provided to ontractor shal

TER FABRIC

hall be a wove ity of the drai shall meet th eave:

ht (Typical): 5

Tensile Streng

Elongation: 1 zoidal Tear St ure Resistance

Flow: 145 se ttivity: 2.1 gp

: 40 U.S. Siev nt Open Area:

esistance: 70%

N GEOTEXT

hall be a non-w biodegradabl ttivity, Max: 0

FORCEMEN

on 31 34 19 ‘R

DMENTS

on 32 93 10 “L

ON

ON AND COO

mation o the Contrac ll schedule de

C en drainage ge inage fabric s e following

5.6 oz./yd2, ac gth: 370 x 200

5% Max, acc trength: 115 x e: 675 lbs., ac ec-1, accordin pm / ft2, accor ve, according

: 10 oz./yd2, a

% / 500 hours

TILE

woven, low-p le, and resista

0.65 gpm / ft2

NT SYSTEM

Reinforced Sl

Liquid Biolog

ORDINATIO

ctor by the Go elivery to the eotextile, non shall be a min

Minimum A ccording to A

0 lbs., accord ording to AST x 75 lbs., acco ccording to A ng to ASTM 4 rding to ASTM g to ASTM D4 according to D s, according to permittivity g ant to damage

2, according t lope System ( gical Amendm

ON

SOIL SYSTE

overnments S

Site similar t n-biodegradab nimum of 110

Average Roll

ASTM D-526

ding to ASTM

TM D-4632

ording to AST

ASTM D-4833

M 4491

D4751 o ASTM D43 geotextile. Th e from insects to ASTM 449

(RSS).”

ment” (NOT

EM - INSTA

Soil Blending to Planting So ble.

0 gal/min/sq. f

Value (MAR

M D-4632

TM D-4533

e fabric shall or rodents.

91.

IN CONTRA

Contra

32 91 19-7

ALLATION

Contractor.

oil Mixes.

ft.

RV) specifica not rot or mi

ACT)

act #2 ations ildew, JEFF - 181202 32 91 19-8

A. The Contractor shall be responsible for communicating and coordinating with the Government’s Soil Blending Contractor on all matters to ensure that the delivery of the planting soil mixes to the Site meets the Project Schedule.

1. The Contractor shall not be held responsible for production issues that are the sole responsibility of the Government’s Soil Blending Contractor.

B. Stockpile areas within the project area are limited. The Contractor shall carefully coordinate and time planting soil mix installation, obtaining and installing soil only after preparations for placement of planting soil have been completed and accepted.

1. Coordinate activities with other Project Contractors so that there is no soil disturbance from traffic or other construction activities subsequent to placement.

C. Coordination with Weather: Planting Soil Mixes shall not be worked (including hauled, handled, placed, compacted, or tracked over) when soil is wet or frozen. Refer to Part 1-“Definitions” herein for definitions of moist, wet, and frozen soil.

1. The Contractor shall take note that silt loam is the base component of the planting soil mixes and is slow to drain after being wetted. Maximum moisture content allowable in soil to be worked is 12% on a volume basis. Contractor shall take precautions to limit schedule interruptions caused by rain or freezing temperatures by tarping on-site soil stockpiles if rain is anticipated. The Contracting Officer shall be consulted to determine if the soil is too wet to work.

3.2 PRE-EXAMINATION, VERIFICATION AND ACCEPTANCE

A. A Pre-installation Examination with the Contracting Officer is required for the work of this section. Schedule the examination at least five days before the installation process begins.

1. As the work proceeds, the Contractor shall schedule a pre-installation examination with the Contracting Officer for each area of planting soil installation.

B. Upon receipt of delivery of planting soil mixes from the Soil Blending Contractor, the Contractor shall visually inspect the soil for moisture content, non-aggregated soil particles, clumping, debris, deleterious or foreign materials, or any other physical conditions that could affect the quality of the planting soil and the Contractor’s installation operations.

1. The Contractor shall immediately notify the Contracting Officer of any soil deliveries that exhibit any of the physical conditions noted above.

2. The Contractor shall not accept or use soil that exhibits any of the physical conditions noted above.

C. The Contractor shall be responsible for verification that all of the planting areas receiving Planting Soil Mixes have been prepared in conformance with the Contract Documents.

1. Verify that subdrainage system has been installed and accepted.

2. Verify that the aeration system has been installed and accepted.

3. Verify that utilities have been installed and accepted.

4. Verify that slope stabilization system has been installed and accepted.

5. Verify that irrigation mainlines have been installed.

JEFF - 181202 32 91 19-9

6. Verify that there is a sufficient means for on-site watering of installed plants.

7. Verify that the rough grading has been accepted by the Contracting Officer.

8. Prior to compaction of rootball pedestal, verify that plant locations have been accepted by the Contracting Officer.

D. Examine subgrade for deficiencies including:

1. Construction debris present within the area to received planting soil mix.

2. Puddling of water, muddy soil conditions, or expressing of water from the subgrade or adjacent areas.

3. The subgrade is not at the correct depths for installing the designated planting soil mix.

4. Incomplete utility, irrigation and /or subsurface drainage installation.

5. Insufficient compaction of subgrade. Refer to Section 31 20 00 “Earthwork.”

E. Submit all noted deficiencies that will impact the proper installation or execution of the Work to the Contracting Officer in writing prior to beginning soil installation operations. The Contractor assumes responsibility for all subgrade work and conditions upon beginning soil installation operations.

3.3 PREPARATION OF SUBGRADE

A. Subgrade shall be scarified (roughened) to a depth of 3” prior to placement of horticultural subsoil and planting soils to create an uneven, broken surface in which the subgrade can be mixed with the first lift of planting soil placed. Scarification can be accomplished using manual or mechanical equipment that does not result in the formation of subsoil pans or slickened faces.

B. Perform infiltration and density tests on subsoil as described in Part 1 of this Section.

1. Infiltration rate for subgrade, Min: 0.25” per hour

2. Compaction rate for subgrade, nuclear density method: Refer to Section 31 20 00 “Earthwork”

3. Compaction rate for subgrade, static cone penetrometer method:

a. 0”-6” Depth: Range 100 to 125 pounds per square inch (psi).

b. 6”-12” Depth: Range 100 to 200 psi.

3.4 STOCKPILE AND STORAGE OF PLANTING SOIL MIXES

A. Coordinate deliveries and installation to limit the amount of soil stockpiled or stored within the project area at any one time.

B. Prohibit vehicular and pedestrian traffic on or around stockpiled planting soil.

C. Maximum height of stockpiles shall be 12’ for soil stored longer than 2 weeks. For soil stored less than 2 weeks, stockpile height shall be a maximum of 20.’ If storage of soil in 20’ stockpiles exceeds the 2 week limit than the contractor shall breakdown and redistribute the stockpiled soil into 12’ high piles. Provide adequate drainage away from soil stockpiles.

JEFF - 181202 32 91 19-10

D. Provide large, clear signage at each stockpile indicating the type of planting soil mix, for example: “Tree Soil TS1”

E. Cover stockpiles to prevent windblown dust, debris or other contamination. Do not locate stockpiles adjacent to work areas where construction activities may contaminate piles.

3.5 SOIL PLACEMENT, GENERAL

A. Notify the Contracting Officer of soil placement operations at least seven calendar days prior to the beginning of work.

1. In addition to the requirements of Section 01 73 40, delineate the limits of soil extents for review and approval by the Contracting Officer.

B. Soil types shall be installed by order of their place within the soil profiles, as shown on the Drawings.

C. Plan work to limit traffic on and compaction of soil during and after installation.

1. Prevention of compacted soils can be accomplished by beginning the work in the center of planting area locations, against walls, or the center of isolated beds, and progressing outwards towards the borders.

2. If traffic is necessary, use tracked equipment that exerts less than 4 psi pressure and limit traffic to defined pathways.

3. Traffic on or installation of wet or frozen soils is expressly prohibited.

D. Coordinate soil mix placement activities with the requirements of Section 32 93 00 “Planting and Fine Grading.” Placement of Horticultural Subsoil and plant stock shall be carried out simultaneously in order to limit soil compaction.

1. The S1 soil horizons (LS1, TS1, BS1) shall not be installed before all woody plants are installed and accepted by the Contracting Officer.

2. The Contractor shall not remove tree location stakes until trees and/or shrubs have been placed on site for review by the Contracting Officer.

E. Placement of soil by back-blading is not acceptable. Back-blading causes sealing of the soil surface and inhibits air and moisture from penetrating the planting soil mix.

3.6 PLACEMENT OF PLANTING SOIL MIXES

A. Place soil mixes to the depths shown on the Drawings.

1. Lifts shall not exceed 8 inches in thickness.

2. Scarify each lift smooth to break or remove clods, and fill low spots or voids.

B. Compaction

1. All Soil profiles except Structural Soil:

a. Compact each lift to between 84 and 87 percent Standard Proctor, measured by the nuclear density method. Contractor shall anticipate that soil placement alone, or

JEFF - 181202 32 91 19-11

moderate hand-tamping, will be sufficient to meet this value. Extreme care shall be taken to not over-compact soil. In all cases, the moisture of the planting soil being placed shall not occur when soil moisture content is greater than 12% volumetric water content. Optimum moisture content for compaction shall not exceed 0.15 g/g as measured by the nuclear density method.

b. Compaction rate for completed soil profile, static cone penetrometer method:

1) 0”-6” Depth: Range 60 to 100 psi.

2) 6”-12” Depth: Range 80 to 120 psi.

2. Structural Soil:

a. Compact each lift to between 90 and 95 percent Modified Proctor, measured by the nuclear density method.

b. Compaction rate for completed soil profile, static cone penetrometer method. The static cone penetrometer will be calibrated against results of the nuclear density meter testing by comparing compression readings of the static cone penetrometer to the optimal soil compaction as measured by the nuclear density meter.

C. After installation, perform in-situ soil density and double-ring infiltrometer tests in conformance with Part 1 of this specification. Remediate any areas that exceed the specified compaction rate or that fail to drain within the specified rate. Remediation shall include de-compaction, aeration, or full replacement of the affected soil areas.

1. Infiltration rate for TS1, LS1 and BS1, Min: 0.5”/hr

2. Infiltration rate for Structural Soil, Min: 0.5”/hr

D. After compaction and testing, scarify each lift and/or soil horizon to prevent the formation of slickened faces. Depth of scarification shall be 2”.

1. Do not scarify final lift of soil profile.

2. At structural soil profile, install woven filter fabric as indicated on the Drawings.

3.7 PLACEMENT OF GEOGRIDS IN PLANTING SOIL

A. For geogrid that bridges between the subgrade and the planting soil mix, the Contractor shall ensure the geogrid remains level relative to its position in the subgrade and that it extends into the planting soil as the lifts are placed.

1. Refer to Section 31 34 19 “Reinforced Slope System” and the Drawings.

3.8 PROTECTION AND REPAIRS

A. The Contractor shall take every precaution to ensure the integrity of the underdrainage, aeration and irrigation systems during and after soil placement. Any damage caused by the Contractor shall be repaired at no additional expense to the Government.

B. The Contractor shall be responsible to ensure that no soil disturbance will occur from construction traffic or other construction activities after placement of planting soil mixes is complete. Disturbance shall be repaired by the Contractor at no additional expense to the Government.

JEFF - 181202 32 91 19-12

1. The Contractor shall place barricades to prevent compaction of planting soil mixes from vehicles, equipment, or pedestrian traffic.

2. Coordinate activities with other project contractors so that there is no soil disturbance from traffic or other construction activities subsequent to placement.

C. Protect newly graded areas from traffic and erosion. Keep free of trash, debris or construction materials from other work.

D. Repair and re-establish grades where completed or partially competed surfaces become eroded, rutted or compacted. Scarify, or, if directed by the Contracting Officer, remove and replace soil to a depth as directed by the Contracting Officer. Reshape and re-compact at optimum moisture content to the required density.

E. Where settling occurs, before final acceptance or during the warranty period, remove finish surfacing, backfill with additional approved material, compact to specified rates, and restore any disturbed areas to a condition acceptable to the Contracting Officer.

1. Repaired or restored areas shall follow the same procedures as specified for installation of new Planting Soil Mixes.

3.9 EXCESS MATERIALS

A. Excess Planting Soil Mixes: Remove the excess planting soil mixture and materials from the project area at no additional cost to the Government.

END OF SECTION