addendum no. 1 - waco, texas · is there any fabric under the rip rap outlet apron that is shown on...

C I TY OF WACO LANDF ILL , MSW-948A

MCLENNAN COUNTY, TEXAS

PHASE V I I L INER AND DRAINAGE CONSTRUCT ION

RFB 2016-049

ADDENDUM NO. 1

Prepared for:

CITY OF WACO

Prepared by:

S C S E N G I N E E R S Texas Board of Professional Engineers Reg. No. F-3407

Dallas/Fort Worth Office 1901 Central Drive, Suite 550

Bedford, Texas 76021 817-571-2288

October 4, 2016 – Addendum No. 1 SCS Project No. 16215113.00

Offices Nationwide www.scsengineers.com

M:\Projects\Waco\16215113.00 2015-2016 Geo_Eng Annual Svcs\Task 18 - Phase VII Specs & Bid Docs\Bid Phase\Addendum\RFB 2016-049 Phase VII Project Addendum 1 (final 2016-10-04).docx

ADDENDUM NO. 1 SUMMARY OF REVISIONS

The following briefly describes the revisions, additions, or clarifications of the Bid Documents and Specifications for Phase VI Liner and Drainage Construction Project for the City of Waco Landfill, Permit No. 948A, RFB No. 2016-049.

1. RESPONSES TO CONTRACTORS’ QUESTIONS 2. REVISIONS TO PRICING FORMS:

Primary Bid Item No. 4 – Excavation – Phase VII liner, Interim Detention Pond, Access Ramp, and Haul Road Subgrade; and Bid Item No. 6 – Engineered Fill – Phase VII Base Grades, Subgrade Preparation (6-inch Subgrade Cushion), Perimeter Berm Embankment, and Haul Road Base Grades were revised to include updated excavation and associated engineered fill quantities due to excavation/backfill of 12 inches of topsoil within fill areas.

Add Alternate 2, Bid Item No. AA2-3 – Excavation – North Basin and Channel A3; and Bid Item No. AA2-4 – Engineered Fill – North Basin and Channel A3 were revised to include updated excavation and associated engineered fill quantities due to excavation/backfill of 12 inches of topsoil within fill areas.

3. REVISIONS TO DRAWINGS 15 and 17

Drawing 15, Detail E15/15 has been revised to delete the TRM reference and to

incorporate ECB and associated anchoring system.

Drawing 17, callout for Detail G15/17, related to Rip Rap (Type 1, 2-foot Thick), nomenclature has been revised (from G13/17) to reference the correct drawing depicting a 12 oz/sy non-woven geotextile under the rip rap outlet.

Revisions to technical specifications have been performed using track changes (i.e., redline/strikeout) and revisions to drawings have been performed using revision bubbles. The bidder shall indicate receipt of Addendum No. 1 by faxing or emailing the Addendum No. 1 receipt verification, to the attention of Mr. Victor Venegas (City of Waco Purchasing Services) at 254-750-8098 or [email protected], respectively.

10/4/16

Purchasing Services Post Office Box 2570

Waco, Texas 76702-2570 Phone: 254-750-8098

Fax: 254-750-8063 [email protected]

CITY OF WACO www.waco-texas.com

Date: 10/05/2016 RFB No: 2016-049 Commodity: City of Waco Landfill, Permit No. MSW-948A Phase VII Liner and Drainage Construction Buyer: Mr. Victor Venegas Closing Time: 2:00 P.M. CST, Thursday, October 13, 2016 Opening Time: 2:01 P.M. CST, Thursday, October 13, 2016

Bid Opening Location: Operations Center, Purchasing Services Office, 1415 N. 4th St., Waco, TX 76707

______________________________________________________

Addendum No: 1 The above-mentioned Bid invitation has been changed in the following manner. Sign and return addendum to the Purchasing Office by the closing time and date with your RFB response. Returning this page signed by your authorized agent will serve to acknowledge this change. All other requirements of the invitation remain unchanged. If you have any questions, please call or stop by the Purchasing Office at the above address.

1. Response to Contractor’s Questions 2. Revisions to Pricing Forms 3. Revisions to Drawings No. 15 and 17 4. Historical Soil Proctors

Firm:_____________________________________________________________________________________ Address___________________________________________________________________________________ Signature of Person Authorized to Sign Bid:______________________________________________________________________ Signor's Name and Title (print or type):_____________________________________________________________________________ E-mail Address:____________________________________________________________________________ Date:____________________Telephone:___________________________Fax:_________________________


CITY OF WACO LANDFILL, PERMIT NO. MSW-948A PHASE VII LINER AND DRAINAGE CONSTRUCTION

BIDDING DOCUMENTS AND SPECIFICATIONS ADDENDUM NO. 1 – RECEIPT VERIFICATION

Contractors and/or Subcontractors bidding on the City of Waco Landfill, Permit No. MSW-948A – Phase VII Liner and Drainage Construction, RFB No. 2016-049 are requested to verify with the City of Waco that Addendum No. 1 to the Bidding Documents and Specifications was received. The Addendum No. 1 package contains the following revised pages/documents:

Response to Contractors’ Questions Revisions to Pricing Forms Revisions to Drawings No. 15 and 17 Historical Soil Proctors

Please check the items that were received above, and fill out the Contractor’s information below. Additionally, fax or email this completed form back to Mr. Victor Venegas (City of Waco Purchasing Services) at 254-750-8098 or [email protected], respectively, verifying receipt of the Addendum No. 1 package. Contractors shall acknowledge receipt of Addendum No. 1 on the pricing form when submitting bids at Bid Opening on October 13, 2016. Thank you for your interest in this project. Name of Bidder (Contractor or Subcontractor) Name of Representative Signature of Representative Date Received


PHASE VII LINER AND DRAINAGE CONSTRUCTION RFB NO. 2016-049

RESPONSE TO CONTRACTORS’ QUESTIONS

The following are the responses to the Contractor’s questions submitted on or before September 30, 2016 (i.e., deadline for technical questions). The Contractors’ questions are provided below, followed by SCS Engineer’s or the City of Waco’s response in bold/italics.

1. Is the contractor required to place 1' of owner supplied milling on the west perimeter road detail (c'-c' 4/8) or just the east access road and ramp?

Asphalt millings are not placed on the referenced roads. 12-inch thick road surface (base aggregate provided by City) to be installed only on the east access road and ramp, not on the west perimeter road.

2. Can the owner provide a proctor with insitu moisture for material that has been

previously excavated from the onsite borrow pit?

Proctor results are not available for material from the current borrow source (i.e., adjacent property). However, we have included two historical proctors from prior cells in Appendix C of this addendum (note, sample locations for these proctors are not known).

3. Can additional information be provided about the scope of work related to removing the

roll off boxes? I.e., number, do we remove dirt inside the boxes and what do we do with them once we removed them?

A total of 11 roll off boxes will need to be removed from the project area. Soil is to be removed from inside the boxes and the empty boxes are to be staged within the immediate vicinity for the City to transport offsite.

4. Section 2271, Part 3.1E states that in addition to seeding the areas receiving the Erosion

control Blanket, the contractor shall seed all other disturbed areas with the exception of the Phase VII liner area and temporary detention. Given the uncertainty of things like the required stockpile area and borrow area can a pay item be added by the acre to cover seeding areas required outside of the erosion control blanket. No additional pay items will be added to cover seeding areas outside ECB. It is Contractor’s responsibility to minimize disturbed areas and to include the cost of seeding outside ECB areas into Contractor’s costs. The soil stockpile and borrow locations do not require seeding.

5. Section 2272, Part 2.1.A.1 calls out Landlock CS2 which is just a standard straw/coconut

erosion control blanket. But detail E15/15 points to an anchor system and calls out TRM which Landlok CS2 is not. Please advise which is correct?


Technical Specifications, Section 2272 Part 2.1.A.1 is correct. Drawing 15, Detail E15/15 has been revised to delete the TRM reference and to incorporate ECB and associated anchoring system.

6. Plan sheet 3, note 6 states the City will provide overhead power to within 100' of the

leachate/underdrain pump location. Will the city also provide the necessary transformer/voltage drop to meet the requirements necessary to power the pumps?

The City will provide the transformer/voltage drop to power the pumps.

7. The Mirafi HP 570 woven fabric specified for the alternate 3 beneath the millings on the haul

road/ramp is substantially heavier and more costly than a typical separation fabric. Would the engineer consider specifying a light material to reduce the cost of the woven fabric?

Millings are not required on the referenced haul roads (see response to Question 1). Mirafi HP 570 woven fabric (or approved equal) is the specified material for Add Alternate 3. No lighter materials will be accepted.

8. Please provide a plan/sketch showing the limits of the haul road and where the 24” CMP

pipes are located.

The limits of the haul road are depicted on Drawing 4, and are located between Survey Points 145/147 and 132/131 on Drawing 4 and ramp section between Survey Points 217/218 and 222/227). The location of the 24” CMP pipes are also depicted on Drawing 4 (at cross section A-A’ and west of cell near MW-4R).

9. Is there any fabric under the rip rap outlet apron that is shown on Drawing 17?

There is a 12 oz/sy non-woven geotextile under the rip rap outlet shown on Drawing 17. The corresponding detail number has been updated from G13/17 to G15/17 to clarify this requirement.

10. What size is the underdrain discharge pipe that is shown on Drawings 6 & 17?

The underdrain discharge pipe is 2-inch diameter HDPE SDR 11 pipe (see Drawing 11, Detail B11/17), which are appropriately called out on the corresponding drawings.

11. What item does the force main manhole tie-in shown on Drawing 9 get paid under?

The forcemain manhole tie-in is depicted on Drawing 11 and will be paid under Primary Bid Item 19 – Leachate Pump, Controls, and Connection to Forcemain in accordance with Section 01025 – Measurement and Payment, related to said bid item.


12. AA1-4 measure and payment refers to a 1.5 diameter underdrain sump discharge pipe, where is this pipe located?

The 1.5-inch diameter underdrain sump discharge pipe is located within the underdrain riser pipe (see Technical Specifications, Section 11300, Part 2.4 B 1).

13. It looks as if the City has been excavating dirt material from within the cell excavation

area after the aerial topo date shown on the plans. Please confirm if this is true as it will increase the amount of rock excavation and decrease dirt excavation for the contractor. If so, can you let us know about how much dirt material has been removed?

Based on discussions with the City, approximately 9,800 cubic yards of soil material have been removed from the cell excavation area. Thus, a new topographic survey will be conducted by the City for this area, provided to the selected Contractor prior to start of construction, and will be used for confirming pay quantities during construction. As such, for this bid submittal, the bidder should base their bid on the quantities provided in the pricing form.

14. Will the Contractor be paid for overburden removal in the borrow area to obtain suitable

material for protective cover and embankment material? There is still a cap rock layer within the borrow area.

SCS Engineers is not aware of a cap rock layer within the borrow area. Regardless, it is the Contractor’s responsibility to perform the work necessary for obtaining soils for use in the project, and confirm that the material is adequate for use in the project consistent with Drawing 2, Note 4. As such, no additional payment will be made for overburden removal within the borrow area.

15. Much of the existing mud area falls within +/- 2’ of proposed Cell subgrade. Will the

Contractor be compensated for over-excavation of this unsuitable material and fill needed to bring it back up to subgrade?

As indicated in the Technical Specifications, Section 02210 Part 3.3 F, no additional compensation will be paid to Contractor for addressing pumping or yielding foundation soils. However, if material needs to be excavate or backfilled to achieve base grades, such work will be paid under the respective bid items. Consistent with the response to Questions 13, this area will be surveyed prior to construction, and payment made for either excavation or engineered fill needed to achieve base grades. As such, for this bid submittal, the bidder should base their bid on the quantities provided in the pricing form.


16. How shall removing 12” of topsoil in the fill area be accounted for? Where shall topsoil be stockpiled? Will the Contractor be compensated for the additional fill required due to 12” stripping of topsoil?

Removal of 12” of toposoil within the fill areas has been added to Primary Bid Item 4 – Excavation, and Add Alternate 2 Bid Item AA2-3 – Excavation. Topsoil shall be stockpiled on top of existing Phases IV-B and V-A. Additional fill volume required by removal of 12” of toposoil within the fill areas has been added to Primary Bid Item 6 – Engineered Fill, and Add Alternate 2 Bid Item AA2-4 – Engineered Fill.

17. Is the Contractor expected to place onsite topsoil under erosion blanket?

Contractor is not expected to place onsite topsoil under ECB areas. 18. Per detail E on 15: how often does the 12” metal pins occur?

As specified in the Technical Specifications Section 02272 Part 3.2 A, ECB anchor devices shall be installed at a frequency consistent with manufacturer’s recommendations.

19. Question addressed during the pre-bid meeting: Where will the excess excavated

material be stockpiled?

Excess excavated material shall be stockpiled as follows: up to 100,000 cy within existing stockpiles located on top of existing Phases IV-B and V-A, and volume in excess of 100,000 cy within the soil borrow area located to the west of the landfill property. As stated in the pre-bid meeting, it is the Contractor’s responsibility to confirm that sufficient material for use as Engineered Fill and Protective has been obtained prior to commencement of shale stockpiling operations on adjacent property (i.e., clay on adjacent property needed during this project for Engineered Fill or Protective Cover shall not be buried by shale stockpile). Options discussed during the meeting were as follows:

Excavate material needed for Engineered Fill and Protective Cover and stockpile in separate location of borrow area before stockpiling shale; and/or

Excavated and place material needed for Engineered Fill for construction of

large perimeter berm embankment or other uses prior to shale excavation and stockpiling on adjacent property.

Whatever methods are used by the Contractor (one of the above or other option) to obtain available soil for Engineered Fill and Protective Cover prior to stockpiling shale on adjacent property shall be accounted for in the Contractor’s respective unit rates for the project.


APPENDIX A

PRINCING FORMS

Pricing Forms

The undersigned bidder, having carefully examined the Contract documents, and the site of the proposed work and being familiar with all conditions of same, hereby proposes to furnish all plant, labor, materials, equipment, and incidentals necessary to construct this project in strict accordance with said documents for the following unit prices:

PRIMARY BID - PHASE VII LINER SYSTEM

BID ITEM

ITEM DESCRIPTION ESTIMATED QUANTITY

UNIT UNIT

PRICE TOTAL

1 Mobilization and Demobilization 1 LS

2 Layout of Work and Surveys 1 LS

3 Clearing and Grubbing (~ 4 acres) 1 LS

4 Excavation - Phase VII liner, Interim Detention Pond, Access Ramp, and Haul Road Subgrade

318,400 323,710

CY

5 Excavation - Liner Tie-in (Phase VI) 810 LF

6 Engineered Fill – Phase VII Base Grades, Subgrade Preparation (6-inch Subgrade Cushion), Perimeter Berm Embankment, and Haul Road Base Grades

53,710 59,020

CY

7 Engineered Fill - Liner Termination Berm and Access Ramp Embankment

1 LS

8 2-foot Protective Cover 42,343 SY

9 Drainage Aggregate (Leachate Collection Trench and Sump)

715 CY

10 12 oz/sy Non-Woven Geotextile (Leachate Collection Trench and Sump)

16,500 SF

11 Geosynthetic Clay Liner (Reinforced GCL) 381,090 SF

12 60-mil HDPE Geomembrane (Smooth) 191,860 SF

13 60-mil HDPE Geomembrane (Textured Both Sides) 194,190 SF

14 200-mil Geocomposite (Single-Sided) 191,860 SF

15 200-mil Geocomposite (Double-Sided) 189,230 SF

16 6-inch HDPE SDR 11 Perforated Pipe 660 LF

17 6-inch HDPE SDR 11 Solid Pipe 175 LF

18 18-inch HDPE SDR 17 Perforated and Solid Pipe 200 LF

19 Leachate Pump, Controls, and Connection to Forcemain 1 LS

20 Concrete Sump/Clean-out Riser Pipe Retaining Wall 1 LS

21 Erosion Control Blanket (Perimeter Berm Embankment) 71,960 SF

22 24-inch Diameter CMP 260 LF

23 Allowance 1 LS $100,000 $100,000

PRIMARY BID TOTAL =

ADD ALTERNATE 1 - UNDERDRAIN DEWATERING SYSTEM

BID ITEM


UNIT UNIT

PRICE TOTAL

AA1-1 Underdrain Sump 1 LS

AA1-2 Underdrain Collection Trenches 1,010 LF

AA1-3 12-inch HDPE SDR 17 Perforated & Solid pipe 200 LF

AA1-4 Underdrain Pump, Discharge Pipe & Appurtenances 1 LS

ADD ALTERNATE 1 TOTAL =

ADD ALTERNATE 2 - SURFACE WATER DRAINAGE

BID ITEM


UNIT UNIT

PRICE TOTAL

AA2-1 Layout of Work and Surveys 1 LS

AA2-2 Clearing and Grubbing (~ 5 acres) 1 LS

AA2-3 Excavation - North Basin and Channel A3 29,150 30,600 CY

AA2-4 Engineered Fill - North Basin and Channel A3 4,100 5,550 CY

AA2-5 Erosion Control Blanket (North Basin and Channel A3) 93,805 SF

AA2-6 12 oz/sy Non-Woven Geotextile (Rip Rap Filtration/Separation)

6,700 SF

AA2-7 Rip Rap (Type 1 - D50 = 9 in.) 220 CY

AA2-8 Rip Rap (Type 2 - D50 = 12 in.) 200 CY

AA2-9 Basin Outlet Low-Water (Asphalt Millings) 1 LS

AA2-10 Concrete Weir 1 LS


ADD ALTERNATE 3 - HAUL ROAD WOVEN GEOTEXTILE

BID ITEM


UNIT UNIT

PRICE TOTAL

AA3-1 Woven Geotextile 1 LS


Contractor shall provide unit Prices for equipment, including operator, to be utilized for the Work in out-of-scope services, as directed by City.

ITEM EQUIPMENT TYPE EQUIPMENT MODEL UNIT COST PER

HOUR

1 Bulldozer

2 Scraper

3 Front-End Loader

4 Backhoe

5 Excavator

6 Off-road Dump Truck

The work proposed to be done shall be accepted when fully completed and finished in accordance with SCS Engineers’ Construction Plans and Specifications, to the satisfaction of the Engineer. The undersigned certifies that the bid prices contained in this proposal have been carefully checked and are submitted as correct and final. In submitting the bid, I agree: (1) to hold my bid open for 90 days after receiving date; (2) to enter into and execute a contract, if awarded on the basis of this bid; (3) to accomplish the work in accord with the Contract Documents; and (4) to complete the work within the specified number of calendar days provided in the Contract Documents. Receipt is hereby acknowledged of the following addenda to the Contract Documents: Addendum No. 1 dated October 4, 2016 Received Addendum No. 2 dated Received By: COMPANY NAME/REPRESENTATIVE

TITLE

MAILING ADDRESS

STREET ADDRESS

CITY, STATE AND ZIP CODE

TELEPHONE NUMBER EMAIL ADDRESS

THIS FORM MUST BE RETURNED AS PART OF BID SUBMITTAL


APPENDIX B

CONSTRUCTION PLANS

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APPENDIX C

HISTORICAL SOIL PROCTORS

TRI/ENVIRONMENTAL, INC.A Texas Research International Company

100

105

110

115

120

Dry

Den

sity

(pcf

)Proctor Compaction Test

2.80

2.70

Project: SCS Engineers (City of Waco)

Sample No.: GF #1

TRI Log No.: E2357-96-03

Test Method: ASTM D 698 - Method A

Maximum Dry Density (pcf): 108.0

Optimum Moisture Content (%): 22.6

Tested by: Joe Vasquez

TRI observes and maintains client confidentiality. TRI limits reproduction of this report, except in full, without prior approval of TRI.

Cheng-Wei Chen, 02/24/12

Quality Review/Date

The testing herein is based upon accepted industry practice as well as the test method listed. Test results reported herein do not apply

to samples other than those tested. TRI neither accepts responsibility for nor makes claim as to the final use and purpose of the material.

80

85

90

95

10 15 20 25 30 35 40 45 50

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Den

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(pcf

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Moisture Content (%)

2.60

9063 Bee Caves Road Austin, TX 78733-6201 (512) 263-2101 (512) 263-2558 1-800-880-TEST

TEAM Consultants, Inc. Geotechnical, Environmental, Construction Materials Testing

2970 S. Walton Walker, Suite 101 Dallas, TX 75211 (214) 331-4395 Fax (214) 331-4458 3101 Pleasant Valley, Suite 101 Arlington, TX 76015 (817) 467-5500 Fax (817) 468-9920

December 4, 2014 TEAM Project No. 142102 Report No. 1 SCS Engineers 12651 Briar Forest Drive Suite 205 Houston, Texas 77077 Attn: Ms. Jean Wilson Re: Geotechnical Laboratory Testing Waco, TX Dear Ms. Wilson: Submitted here is our report of laboratory testing services completed on one (1) bulk soil sample received at our materials testing laboratory in Arlington, Texas December 2, 2014 for the above referenced project. The sample was tested for Moisture Content (ASTM D 2216), Atterberg Limits (ASTM D-4318), Grain Size Analyses (ASTM D-422), and Proctor (ASTM D-698A). The results of those tests are presented on the attached summary. We have also enclosed a copy of the proctor curve for your reference. We appreciate the opportunity to be of assistance to you with this project. Should you have any questions, or if we may be of further assistance, please call. Very truly yours, TEAM Consultants, Inc. Matthew Hannah, ET Technical Services Supervisor MH/ms Attachments

MOISTUREUNIFIED SOIL CONTENT

Date CLASSIFICATION (ASTM D-2216) OPTIMUM MAXIMUMSample Received SYSTEM LIQUID PLASTICITY As Received MOISTURE DENSITY (Dry)

Identification (ASTM D-2487) 1" #4 #10 #40 #200 LIMIT INDEX (%) (%) (pcf)

S-1 12/2/2014 CH 99.3 96.1 94.2 91.6 84.0 74 45 31.7 29.6 89.5

SUMMARY OF LABORATORY TEST RESULTS

SCS Engineers, Waco Landfill

ATTERBERGGRAIN SIZE ANALYSIS LIMITS

Proctor(ASTM D-698)

(ASTM D-422) (ASTM D-4318)FRACTION PASSING SIEVE

TEAM Consultants, Inc.

2970 S. Walton Walker, Suite 101 Dallas, Texas 75211 Phone: (214) 331-4395

Fax: (21 4) 331-4458

To: SCS

24 26



Job No.:

Date:

28 30 32 Moisture Content in Percent

3101 Pleasant Valley Lane, Suite 101 Arlington, Texas 76015 Phone: (817) 467-5500

Fax: (817) 468-9920

142102

12/3/14

34 36

OPTIMUM MOISTURE TEST