Supplemental_Technical_Specifications_&_Special_Provisions.pdf

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SUPPLEMENTAL SPECIFICATIONS

ROAD AND STREET CONSTRUCTION

P.I.D. No. 003900A

STARKEY M10 SMF RETROFIT

In Pinellas County, Florida

TO ACCOMPANY PINELLAS COUNTY STANDARD TECHNICAL SPECIFICATIONS FOR

ROADWAY AND RELATED CONSTRUCTION (JULY 2019 EDITION), AND FLORIDA

DEPARTMENT OF TRANSPORTATION (FDOT) STANDARD SPECIFICATIONS FOR ROAD

AND BRIDGE CONSTRUCTION – DIVISIONS II AND III ONLY (JULY 2021):

Modified Pinellas County Standard Technical Specification (Replaces the July 2019 Clearing and Grubbing Specification)

CLEARING & GRUBBING 110

The work specified under this Section consists of the clearing and preparation of sites for proposed construction, in accordance with the requirements of Section 110 of the FDOT Specifications, as amended herein. The work specified under this Section must include the removal and off-site disposal of all trees indicated on the plans to be removed, the removal and off-site disposal of all brush, stumps, roots, rubbish and debris, and all obstructions resting on or protruding through the surface of the existing ground and the surface of excavated areas, the removal and off-site disposal of all existing facilities, drainage structures, culverts, pipes, and pavement indicated on the plans to be removed, and the removal and off-site disposal of all buildings, structures, appurtenances, and other facilities necessary to prepare the area for the proposed construction.

No stock piling of material on the roadway, within tree protection zones (TPZ), or on the sidewalk is allowed. All extra dirt and/or debris must be removed daily as part of the daily clean-up process.

The roadway and the sidewalks must be swept daily. All costs associated with daily clean-up process and sweeping must be included in the Lump Sum bid for Clearing and Grubbing. All buildings, structures, utilities, and other obstructions indicated on the plans to remain, must be carefully protected against displacement or damage. Materials and labor for this protection must be included in the Lump Sum cost of Clearing and Grubbing.

Except as otherwise provided for in these specifications, the work to be performed under this Section must also include the clearing and grubbing necessary for the excavation of detention ponds, borrow pits, and the like, and the clearing and grubbing necessary for the construction of designated haul routes, and including the removal and off-site disposal of all product and debris except that which is to be salvaged or which is required to complete the construction of the project.

Where possible, all trenching or excavation within tree protection zones (TPZ) shall be done by hand or an air spade. After excavation, all tree roots greater than one inch (1”) in diameter must be cleanly pruned or saw cut, not crushed or torn. Where it is not possible to hand trench, mechanical excavation may be approved by the Engineer. Trunk/root flare and soil/root protection measures in accordance with Pinellas County Standard Detail Index 1111 must be employed to prevent tree damage from mechanical excavation equipment. The Contractor must not cut tree roots greater than three inches (3”) in diameter within the critical root zone (CRZ) without prior approval of the Engineer, after the inspection of an International Society of Arborists (ISA) Certified Arborist, preferably ISA Tree Risk Assessment Qualified (TRAQ).

All root pruning must conform to ANSI A300 (Part 8) Standard Practices (Root Management).

After root pruning, cut roots should be covered and kept moist until final grade is established.

Cutting tree roots greater than 3” in diameter in the critical root zone (CRZ) or tree roots greater than six inches (6”) in diameter within the TPZ shall be reviewed by a County Arborist to determine if a tree designated to remain may need to be removed to prevent future liability.

The Contractor must make his own inspection to determine the character, density and extent of trees, vegetation, and other items subject to removal and disposal under these provisions. The attention of the Contractor is directed to the fact that the burning of debris resulting from clearing and grubbing operations will not be permitted within County-owned lands or rights-of-way. Nothing in these provisions must be construed to authorize the removal or disturbance of any tree or other form of vegetation, or any marine, land or air creatures’ natural habitat, which may be subject to the jurisdiction of regulatory agencies. This Section must also include the cost for trimming of trees and disposal of the trimmings, as shown on the plans and/or required for construction of project. All tree trimming must be performed by or under the supervision of an ISA Certified Arborist and conform to ANSI A300 (Part 1) Standard Practices (Pruning), cost of which is included in the Clearing and Grubbing pay item.

This Section must also include the temporary relocation of mailboxes during construction and permanent relocation after construction has been completed. The work must also include the relocation of the mailbox foundation. The Contractor must coordinate with the Post Office to confirm the mailbox locations. Mailboxes must be restored to equal or better condition that existed prior to the commencement of construction activities, location of which must meet roadway clear zone requirements found in the FDOT Florida Green Book. Work related to mailboxes must be included in the Lump Sum pay item for Clearing and Grubbing.

A. Ownership of Removals:

i. All removed materials not claimed by the County must become the property of the

Contractor and must be disposed of by the Contractor in areas provided by the

Contractor. This work must be included in the pay item Clearing and Grubbing.

ii. Transporting and placement of removed material must be paid for under and included in the pay item of Clearing and Grubbing.

B. Items in County Right-of-Way:

The Contractor must notify in writing all property owners to remove any items (landscaping, signs, irrigation systems, lighting, etc.) from the County Right-of-Way that owners wish to salvage a minimum of fourteen (14) calendar days in advance of construction activities. After the notification period, it is the Contractor’s responsibility to remove said items that conflict with construction activities prior to construction. For irrigation systems that the owners wish to salvage, the contractor must place a cap and a location stake on the pipe that feeds into the irrigation system conflicting with construction activities within County Right of Way. The price and payment for capping and removal of irrigation systems, and removal of other items must be included in the payment item of Clearing and Grubbing.

C. Tree Protection: Trees not within the Clearing and Grubbing area and those specified to remain within County property/right of way, must be protected during construction with Tree Protection Barricades, in accordance with Pinellas County Standard Detail Index 1111. All project-specific tree and root protection; mulching within all critical root zones; tree and root pruning; and all tree protection as shown on the plans. Contractor shall provide a certified arborist on site to supervise all tree and root pruning, as well as all tree protection installation work as shown on the plans.

D. Tree and Stump Removal: Unless otherwise indicated by the Engineer in the construction documents, all trees deemed in conflict with the construction activities must be marked by the Contractor for removal, and field validated by the Engineer and a County Arborist in advance of construction. The Contractor must not remove any trees without authorization from the Engineer, after inspection by an ISA Certified Arborist.

E. This work must be included and paid for under the pay item Clearing and Grubbing. Tree stumps, roots, debris, subterranean items, and other abandoned items:

i. Unless otherwise directed by the Engineer, must be removed from sidewalk, drainage, roadway and driveway areas to a depth of1) six (6) inches below the bottom of the aforementioned item OR 2) four (4) feet below the proposed surface (the greater of the two) and backfilled with A-1 or A-3 soil material. The excavation and backfilling must be included in the Lump Sum cost of Clearing and Grubbing.

Basis of Payment The work and incidental costs specified as being covered under this Section must be paid for at the contract unit price per Lump Sum (LS), for Clearing and Grubbing. If the Schedule of Values includes a specific pay item from the list provided in FDOT Section 110-12.8 Payment Items, then the work must be paid for at the contract unit price.

Section 900-0100 of the Pinellas County Roadway Std. Tech. Specs. SIGN -

PROJECT IDENTIFICATION

PAY ITEM NO. 900-0100 SIGN, PROJECT IDENTIFICATION, Erect & Maintain

The work specified under this Section consists of the furnishing of all labor and equipment required for the erection and maintenance of one 4-foot x 8-foot x 1/8-inch aluminum

Project Identification Sign and one 24-inch x 30-inch Penny for Pinellas sign, at locations to be designated by the Engineer, prior to construction.

The signs shall be provided and transported to the project site by the County, but shall be erected by the Contractor, and shall be maintained by the Contractor, to the satisfaction of the Engineer, for the duration of the construction period. At substantial completion of the construction period, the Contractor shall remove and dispose of the Project

Identification Sign. The 24-inch x 30-inch Penny for Pinellas sign shall remain in a permanent location designated by the Engineer.

Measurement and Payment: The work specified under this Section shall be paid for Lump

Sum (LS) as constructed and accepted.

SPECIAL PROVISIONS

(Amends the Pinellas County Standard Technical Specifications for

Roadway and General Construction) http://www.pinellascounty.org/technical/pdf/roadway-tech-specs-July-2019.pdf

Section 005-0700 of the Pinellas County Roadway Std. Tech. Specs. Survey and Layout The specification for Survey, Construction Layout shall be amended to include:

• The right of way shall be staked out with a stake or marker every 100 feet on both sides of the road.

• All property corners and section corners shall be protected through the contract period by the contractor, if a property corner is damaged, they will be restored by a Florida registered Professional Land Surveyor at no additional cost to the County.

PAY ITEM NO. 005-0700, Survey and Layout the work specified under this Section must be one Lump Sum (LS) quantity.

Section 005-0850 of the Pinellas County Roadway Std. Tech. Specs. Permitting As-Built Survey Requirements by Contractor

The specification for Survey, Permitting As-Built Survey Requirements by Contractor shall be amended to include:

The items requiring as-built surveying include the specific as-built requirements for the Florida Department of Environmental Protection (FDEP) permit and the Southwest Florida Water Management District (SWFWMD) permit. Draft as-builts shall be provided at or prior to substantial completion for review by the Engineer and to allow for corrections (both in the field and in the survey). The following information shall be shown on the as-built survey:

• Benchmark(s) - location and description

• Datum- All elevations should be referenced to a vertical datum clearly identified on the survey

• Drainage structures - locations, dimensions, elevations, pipe sizes and material, inverts

• System grading - dimensions, elevations, contours, final grades

• Detailed finished structure as-built information for the weir including sheet pile top, slot, concrete pad, skimmer, and rip-rap grade. This will include detailed topography minimum 25’ upstream and downstream and across the width of the weir. Grading shots shall include the final grading of the lateral ditch and pipe end finish from the offsite stormwater pond outfall.

• Cross-sections of Pond M10 and 6C areas at maximum 50’ intervals, inclusive of areas between (stations 13+50 to 17+00). The cross sections shall extend from property line to property line and shall show all break points.

• Provide elevations and dimensions of all structures including Pond 6C overflow spillway, control structure S-619C (including elevations and dimensions of structure, weir, concrete pad and grading around structure), and MES’s S-619C2 and S-619D.

• Slurry wall dimensions including top and bottom elevations along length and width.

Measurements to be collected prior to final cover.

As-builts information shall be provided at substantial completion of the project.

PAY ITEM NO. 005-0850, SURVEY, Permitting As-built Requirements the work specified under this Section must be one Lump Sum (LS) quantity.

Section 120-1100 of the Pinellas County Roadway Std. Tech. Specs. Grading

The specification for Grading shall be amended to include:

PAY ITEM NO. 120-1100 Grading

The work shall consist of all labor and material required to construct the pond sites and weir as shown on the Plans and as listed in the specifications. Contractor shall review the project geotechnical reports. The work to be performed under this Section must include the excavation and disposal of any unsuitable material.

PAY ITEM NO. 120-1100 Grading the work specified under this Section must be one Lump Sum (LS) quantity.

Section 125-3000 of the Pinellas County Roadway Std. Tech. Specs. Bedding Material

The specification for Bedding Material shall be amended to include:

PAY ITEM NO. 125-3058 Bedding Material, Crushed Stone, Size #57, Including Geo-textile Wrap

• The work shall consist of all labor and material required to construct the bedding material with associated geotextile fabric as shown on the Plans.

PAY ITEM NO. 125-3058 Bedding Material, Crushed Stone, Size #57, Including Geo-textile Wrap the work specified under this Section must be paid for per Each (EA) per the plans, satisfactorily completed and accepted and/or adjusted.

Section 162 of the Pinellas County Roadway Std. Tech. Specs. Organic Topsoil Layer

The specification for Organic Topsoil Layer shall be amended to include:

PAY ITEM NO. 162-1000, ORGANIC TOPSOIL LAYER, 8”

• The work shall consist of all labor and material required to construct the organic topsoil layer to an 8” thickness, as shown on the plans and listed in the specifications.

PAY ITEM NO. 162-1000, ORGANIC SOIL LAYER, 8” the work specified under this Section must be paid for per Square Yard (SY) per the plans, satisfactorily completed and accepted.

Section 425 of the Pinellas County Roadway Std. Tech. Specs. Inlets, Manholes and Junction Boxes

The specification for Inlets, Manholes and Junction Boxes shall be amended to include:

PAY ITEM NO. 425-377-0000, INLET, Ditch Bottom, FDOT Type H, Modified, > 10'

• The work shall consist of all labor and material required to construct structure S-619C - INLET, Ditch Bottom, FDOT Type E, S-2, Modified, < 10' including the weir, slots, concrete pad, hole for 4” PVC, and special grading as shown on the Plans and as listed in the specifications.

Section 430 of the Pinellas County Roadway Std. Tech. Specs. U-TYPE ENDWALLS AND

FLARED OR MITERED END SECTIONS

The specification for U-TYPE ENDWALLS AND FLARED OR MITERED END SECTIONS shall be amended to include:

PAY ITEM NO. 430-425-4368-2, END SECTION, MITERED, Cross Drain, 43" x 68" ERCP, slope 1:2

• The work shall consist of all labor and material required to construct END SECTION, MITERED, Cross Drain, 43" x 68" ERCP, per index 430-021, slope 1:2 including the special 24” footing and grading as shown on the Plans and as listed in the specifications.

PAY ITEM NO. 430-425-4368-2, END SECTION, MITERED, Cross Drain, 43" x 68" ERCP, slope 1:2 the work specified under this Section must be paid for per Each (EA) of the structures identified in the applicable pay items, satisfactorily completed and accepted.

PAY ITEM NO. 430-425-4368-4, END SECTION, MITERED, Cross Drain, 43" x 68" ERCP, index 430-021, slope 1:4

• The work shall consist of all labor and material required to construct END SECTION, MITERED, Cross Drain, 43" x 68" ERCP, index 430-021, slope 1:4 including grading as shown on the Plans and as listed in the specifications.

PAY ITEM NO. 430-425-4368-4, END SECTION, MITERED, Cross Drain, 43" x 68" ERCP, index 430-021, slope 1:4 the work specified under this Section must be paid for per Each (EA) of the structures identified in the applicable pay items, satisfactorily completed and accepted.

Section 530-2000 of the Pinellas County Roadway Std. Tech. Specs. RIPRAP

The specification for RIPRAP shall be amended to include:

PAY ITEM NO. 530-2000 RIPRAP, Rubble w/ Filter Fabric

• The work shall consist of all labor and material required to install the RipRap Rubble with Filter Fabric listed in the plans and specifications.

PAY ITEM NO. 530-2000 RIPRAP, Rubble w/ Filter Fabric the work specified under this Section must be paid for per Ton (TN) installed and accepted.

SUPPLEMENTAL SPECIFICATIONS

ROADWAY / DRAINAGE

(The following supplemental specifications are in addition to the Pinellas County Standard Technical Specifications for Roadway and General Construction) http://www.pinellascounty.org/technical/pdf/roadway-tech-specs-July-2019.pdf

ITEM NO. 102-1099 VARIABLE MESSAGE BOARD

Description: The work specified under this Section shall meet FDOT requirements and shall consist of Contractor providing two variable message boards (VMBs) to provide advance notice of construction in the project area. VMBs to be placed at 126th Avenue at the location of the weir construction and on 126th Avenue at the Tall Pines Drive intersection. VMBs shall be placed 21 days in advance of construction mobilization.

Measurement and Payment: The work specified in this section shall be paid for at one (ED) quantity.

ITEM NO. 120-0810 DEWATERING, with Treatment

Description: The work specified under this Section shall consist of all work associated with dewatering of construction area, including pond sites and area of weir construction. Also, included is monitoring of effluent and all appropriate treatment of dewatering effluent to address turbidity and/or other contamination issues.

The CONTRACTOR shall include in his/her bid all applicable costs, including monitoring, resulting from treatment and disposal of contaminated groundwater with concentration levels that exceed the allowable limits of the FDEP generic permit, and shall not be entitled to any adjustment in the Contract Price as a result of any change in the permit fees or unanticipated treatment and disposal costs.

Prior to any work commencing, and for the duration of the work, the CONTRACTOR is responsible for meeting all the conditions of the applicable permits and submitting any required reports to the appropriate agencies. Contractor shall submit a dewatering plan (shop drawing) to the County for review and approval prior to mobilization to the site.

Permitting

Contractor shall apply for and obtain any and all permits for dewatering activities and/or treatment approvals that the Water Management District requires including, but not limited to:

1. No-Notice Short-Term Dewatering Permit (40D-2.101(1), F.A.C.) If the CONTRACTOR’S proposed work is expected to exceed 90 days in duration, or does not meet any of the other requirements listed with the requirements of Rule 40D- 20.302(3), the CONTRACTOR must apply for and obtain a Dewatering General Water Use Permit (40D-2.101(1) F.A.C.)

The CONTRACTOR shall not be entitled to file, or recover under, any delay claim based on preparation of permit applications and the time required for obtaining the applicable permits. If, prior to or during the dewatering, it is determined that the disposal or discharge of the dewatering effluent is not authorized by the FDEP’s Generic Permit for the Discharge of Produced Ground Water from Any Non-Contaminated Site Activity, the CONTRACTOR shall diligently pursue further required permit(s) from FDEP or other agencies without resort to delay claims or recompense from the COUNTY for either permit application activities or the time required to obtain such permits.

The CONTRACTOR shall consider and anticipate the potential need to obtain the herein discussed permits in developing his schedule, and shall make every effort to avoid or minimize potential impacts to his critical path that might result from delays in dewatering activities due to the time necessary for the CONTRACTOR to obtain the necessary permits. The CONTRACTOR shall make every effort to schedule activities requiring dewatering as late as possible during his schedule, and shall schedule activities not impacted by dewatering as early as possible. For each day, up to a maximum of one hundred eighty (180) days that the CONTRACTOR diligently pursues such permit(s) and is unable to avoid adversely impacting his critical path, a day will be added to the time allotted to the CONTRACTOR to complete performance of the Project.

If exceedances are found in the dewatering effluent, the CONTRACTOR will be required to:

1. Immediately notify the COUNTY and report the exceedances that are encountered.

2. Meet with the FDEP to determine any and all alternatives that are acceptable.

3. Obtain prior COUNTY approval of treatment and disposal alternatives.

4. Obtain prior written COUNTY authorization to use pay item 120-0810

5. Apply and obtain any and all permits and/or treatment approvals that FDEP requires including, but not limited to:

a. Generic Permit for Discharges from Petroleum Contaminated Sites (62-

621.300(1), F.A.C.). Allows discharges from sites with automotive gasoline, aviation gasoline, jet fuel, or diesel fuel contamination.

b. Permit for all Other Contaminated Sites (62-04; 62-302; 62-620 & 62-660, F.A.C.).

The coverage is available only through the individual NPDES permit issued by FDEP. Allows discharges from sites with general contaminant issues, i.e. ground water and/or soil contamination other than petroleum fuel contamination.

c. Generic Permit for the Discharge of Produced Ground Water from Any Non- Contaminated Site Activity (62-621.300(2), F.A.C.).

d. Generic Permit for Stormwater Discharge from Large or Small Construction Activities (62-621.300(4) (a), F.A.C.).

Treatment

The term treatment as used in this technical provision means the application of all FDEP approved techniques and/or methods available to remove the exceedances out of dewatering effluent except impounding. Impounding is not considered a treatment method for purposes of compensation under this technical provision.

The CONTRACTOR shall implement the appropriate treatment that is acceptable to FDEP, COUNTY, and, if necessary, the Water Management District to attain compliance for all exceedances encountered during dewatering activities. Treatments may include, but are not limited to: chemical treatment, ion exchange treatment, filtration, and disposal of discharged groundwater in a properly permitted facility.

The CONTRACTOR shall:

1. Make every effort to minimize the spread of contamination into uncontaminated areas;

2. Provide for the health and safety of all workers at the job site and make provisions necessary for the health and safety of the public that may be exposed to any potentially hazardous conditions;

3. Ensure such provisions adhere to all applicable laws, rules or regulations covering hazardous conditions in a manner commensurate with the level of severity of the conditions;

4. If necessary, provide contamination assessment and remediation personnel to handle site assessment, determine the course of action necessary for site security, and perform the necessary steps under applicable laws, rules, and regulations for additional assessment and/or remediation work to resolve the contamination issue;

5. Delineate the contamination area(s), any staging or holding area required, and develop a work plan that will provide the schedule of projected completion dates for the final resolution of the contamination issue;

6. Maintain jurisdiction over activities inside any delineated contamination areas and any associated staging or holding areas;

7. Be responsible for the health and safety of workers within the delineated areas; and

8. Provide continuous access to representatives of regulatory or enforcement agencies having jurisdiction.

Measurement and Payment: The work specified in this section shall be paid for at one Lump Sum (LS) quantity provided and accepted.

PAY ITEM NO. 102-5000 Water for Dust Control

Description: The work specified under this Section consists of the furnishing and application of Water on the construction area including but not limited to sub-grade, un-surfaced base, or other un-surfaced traveled ways, or areas of cleared vegetation, in order to control dust resulting from construction operations. The locations and frequency of application must be as directed by the Engineer.

Water used for controlling moisture content of surfaces to meet compaction requirements, mixture and/or working of material, etc. is at the expense of the contractor, included in the work being performed and not paid as “Water For Dust Control”. The water used may be obtained from any approved source that meets Federal, State and local requirements.

Measurement and Payment: The work specified under this Section must be paid for at the contract unit price per Thousand Gallons (THG) of Water for Dust Control.

ITEM NO. 120-2000 SLURRY WALL

Description: The work specified under this Section shall consist of furnishing the necessary plan, labor, materials, tools, equipment, and services necessary to construct a soil-bentonite slurry trench in accordance with these specifications and with the Florida Department of Transportation Specifications for Road and Bridge Construction. Section 120 EXCAVATION AND EMBANKMENT, as amended. The slurry trench shall have essentially vertical walls with vertical and lateral dimensions corresponding to those shown on the plans by the designer.

SUBMITTALS: Submit the following:

• A122-2.1 Manufacturer's product data and specification data sheet.

• A122-2.2 Design mix

MATERIALS:

• A122-3.1 Soil-Bentonite: The slurry trench shall be constructed using a premium grade, high swelling sodium montmorillonite bentonite that meets or exceeds the standards of the American Petroleum Institute (API) as contained in API specifications 13-A (Spec. 13-A), Twelfth Edition, October, 1988, of the specifications for Oil Wells. Each truckload of bentonite shall have a certificate provided by the supplier certifying that the bentonite meets API 13-A specifications.

• A122-3.2 Fluid Materials: Fresh water which has no deleterious interaction with the bentonite shall be used to manufacture the slurry.

MIXTURE/ PLACEMENT: Soil -bentonite backfill mixture shall not shrink, consolidate or otherwise settle more than 2-inches beneath the proposed top of the slurry trench during the first 24 hours after filling, or more than 6-inches thereafter. If settlement in excess of the specifications occurs, the contractor shall be required to refill the trench with approved soil-bentonite backfill at no additional cost to the County.

Properties shall be as follows:

a. The in-situ coefficient of permeability of the soil-bentonite backfill shall be no greater than 1 x 10^-6 cm\sec.

b. The soil-bentonite backfill mixture shall have a minimum bentonite content of 3.0 percent by dry weight of soil.

c. The soil used as backfill shall have no less than 10-percent material by dry weight passing the U.S. Standards No. 200 sieve size.

d. The soil-bentonite mixture shall have no less than 13.0 percent by dry weight passing the U.S. Standards No. 200 sieve, no less than 50 percent of the material passing the No. 20 sieve and no particles larger than 3 - inches in diameter.

e. Soil excavated from the trench can be used as backfill provided it is mixed to be homogeneous and meets the specifications. If the excavated soil does not meet the specifications, borrow material shall be added to the excavated soils, thoroughly mixed with the excavated soils to a homogeneous mixture meeting the specifications and used as backfill.

f. Admixtures shall not be used except as approved in writing by the Engineer.

g. Slurry with balls of partially wetted clay will be rejected at the trench.

At 24 hours past completion of the backfill placement, the slurry trench shall be capped before the exposed backfill can dry out. Prior to placing of the cap material, the slurry trench shall be inspected by the Engineer. Cracked or damaged areas of the slurry trench or areas of excessive settlement shall be replaced before placement of the cap material. Upon completion of the slurry trench, unless otherwise specified by the designer, a layer or geotextile fabric followed by 12 -inches of capping material shall be placed above the slurry trench, followed by embankment material to finished grade. Unless otherwise specified by the designer, the geotextile fabric shall be Type R-1, Index 199. The capping material shall be select soil material mixed with Type B stabilizing material in sufficient proportions to provide a Limerock Bearing Ratio of at least 40.

The material shall be placed in compacted lifts with the upper 12- inches compacted to at least 95% of the AASHTO T-180 maximum dry density.

YIELD QUALITY CONTROL: Provide samples and measurements to the County approved geotechnical service for the following minimum tests.

a. Daily gradation and permeability of the soil-bentonite backfill.

b. Trench depth and trench bottom soil sample every 20-feet of trench length.

c. Bentonite slurry viscosity (Marsh Punnel 1, 500/1 quart, 40 seconds minimum);

soil-bentonite backfill slump (ASTM C 143, between 4 to 6 inches); and bentonite slurry Density (Mud Balance - between 65 to 95 pounds per cubic foot (PCF), at least 15 PCF lighter than soil-bentonite backfill) every two hours.

NOTES:

1. Slurry wall shall be constructed at pond location as identified in the plan set.

2. The bentonite used shall be a premium grade high-swelling, sodium montmorillonite base product. The contractor shall submit the bio-mineralogic information and Atterberg limits (ASTM D-423 and D-424).

3. The soil-bentonite backfill mixture shall have a minimum bentonite content of 3.0 percent by dry weight of soil and as much bentonite as necessary to meet the permeability criterion of less than 1 x 10^-6 cm\sec.

4. Soil excavation from the trench may be used as backfill material when meeting requirements indicated in the project specifications.

5. A minimum of one sample of backfill per day or one sample for each 300-feet of installed slurry wall shall be obtained for laboratory permeability testing by a geotechnical firm approved by the engineer.

6. Payment shall be made per S.F, and be based upon square foot of project vertical area.

Measurement and Payment: The quantity for Slurry Wall to be paid for under this section shall be for "Slurry Wall" per square foot, complete in place and accepted. The area to be paid for shall be measured from the top of the slurry wall to the bottom of the slurry trench; and from the beginning to end of slurry wall limits as shown in the Contract Plans. The area of the cap shall not be Included in the calculation of the square feet of slurry wall. The cost of geotextile fabric and cap material are to be included in the Contract Unit Price for slurry wall, square feet. This price shall include full compensation for furnishing all labor, equipment, tools and incidentals necessary to complete this item. The work specified in this section shall be paid for at the contract unit price per Square Foot (SF) of the size specified on the bid submittal sheet.

Note as-built survey to confirm installation dimensions shall be paid for under Pay Item 005-850 Permitting As-Built Survey Requirements by Contractor. Survey shall be performed at the time of installation and shall confirm slurry wall depth and width prior to final fill placement.

ITEM NO. 800-1601 RESTORATION OF PRIVATELY OWNED FEATURES AND FACILITIES

Description: The work specified under this Section shall consist of all labor and material required to restore all privately owned features and facilities along Tall Pines Drive utilized during construction access activities to same of better than pre-existing condition. This includes road surface and base, curbing, sidewalk, guardrail, sodding, etc.

Measurement and Payment: The work specified in this section shall be paid for at the contract unit price per Lump Sum (LS) actually constructed and accepted.

PAY ITEM NO. 900-2000 Maintenance of Channel Flow

Description: The work consists of all labor and material required to maintain channel flow including coffer dams, pumping, temporary piping and provisions for overflow conditions including cleanup after overflows occurs. This section shall also include all labor and materials required to keep the work area dry, including dewatering by well points, associated dewatering permits as required, and pumping out the work area with required sediment control of the discharged water as required by permit.

Measurement and Payment: The work specified under this Section shall be paid for at the contract unit price per Lump Sum (LS) constructed, operated and accepted.

Payment will include labor and materials required to operate and maintain the system for the entire duration of the construction of the channel and related items as detailed on the plans and listed in the specifications.