am_0002.pdf

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

CHAPEL COMPLEX

PN 02239

FORT BLISS, TEXAS

See attached documentation for content of the amendent changes to the RFP.

Date for receipt of Proposals is 3 July at 1400 hours.

Government point of contact: Diana Vanderzanden (402) 995-2066

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

MODIFICATION OF CONTRACTS/ORDER

NO.

E. IMPORTANT: Contractor

15B. CONTRACTOR/OFFEROR

is not, copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer tended.

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

(a) By completing Items 8 and 15, and returning submitted; or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDG- MENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

is extended, B.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CON-

TRACT ORDER NO. IN ITEM 10A.

2. AMENDMENT/MODIFICATION NO.

6. ISSUED BY

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS,

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) is required to sign this document and return

15A. NAME AND TITLE OF SIGNER (Type or print)

PAGE OF PAGES 1. CONTRACT ID CODE

5. PROJECT NO. (If applicable) 4. REQUISITION/PURCHASE REQ. NO. 3. EFFECTIVE DATE

7. ADMINISTERED BY (If other than Item 6)

15C. DATE SIGNED

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16B. UNITED STATES OF AMERICA

BY

16C. DATE SIGNED

9A. AMENDMENT OF SOLICITATION NO.

9B. DATED (SEE ITEM 11)

10B. DATED (SEE ITEM 13)

CODE CODE

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

is not ex-copies to the issuing office.

NSN 7540-01-152-8070

PREVIOUS EDITION UNUSABLE

STANDARD FORM 30 (REV. 10-83)

Prescribed by GSA

FAR (48 CFR) 53.243

(Signature of person authorized to sign) (Signature of Contracting Officer)

USAPPC V1.00

10A.

30-105-02

See Item 6U.S. ARMY CORPS OF ENGINEERS, OMAHA DISTRICT

CONTRACTING OFFICE

1616 CAPITOL AVE.

OMAHA, NE 68102-4901

CODE

W9128F

FACILITY CODE

J 1

0002 19-Jun-2008

W9128F-08-R-0033

29 -May-2008

30-Jun-2008

Am #0002 - 1

Am #0002 - 2 (Continuation SF 30)

DEPARTMENT OF THE ARMY

Omaha District, Corps of Engineers 1616 Capitol Avenue Omaha, Nebraska 68102-4901 :NOTICE: Failure to acknowledge : Solicitation No. W9128F 08 R 0033 :all amendments may cause rejec- :

:tion of the offer. See FAR : Date of Issue: 29 MAY 2008 :52.215-1 of Section 00 21 00 : New Date of Receiving Proposals:

3 JUL 2008

Amendment No. 0002 30 June 2008

SUBJECT: Amendment No. 0002 to Early Contractor Involvement Request for Proposal Solicitation Package for pre-construction services and construction of CHAPEL COMPLEX, PN 02239, FORT BLISS, TEXAS.

Solicitation No. W9128F 08 R 0033.

TO: Prospective Offerors and Others Concerned

1. The Request for Proposal documents for subject project are hereby modified as follows (revise all indices and attachment lists) accordingly.

a. Request for Proposal. (Descriptive Changes.)

(1) Section 00 11 00, Standard 1442 and CLIN Pricing Schedule, delete this section in its entirety and substitute the attached revised Section 00 11 00, Standard Form SF1442 and CLIN Pricing Schedule.

(2) Following Section 00 73 00, insert attached Section 00 73 46 Preliminary Wage Determination Schedule (For Construction – TX080122 – Building dated 04/11/2008).

(3) Section 01 10 00 STATEMENT OF WORK, Page 4, to the end of paragraph 1.3.1, add:

“The Fort Bliss, TX application of the Army Standard Design includes the following aesthetic and functional preferences:

The exterior theme is intended to reflect the existing Southwestern aesthetic on the installation. Building walls should include an adobe or stucco appearing finish with some local stone in the form of a wainscot and trim. Roofing should be of a clay tile appearing finish.

Other trim and featuring should coordinate with this theme. The interior theme should relate somewhat to the exterior theme. The majority of interior partition finishes should be simple painted wall board. Restroom and kitchen walls should include some tile finishes.

A wood base and some wood appearing feature trim should be provided in the Worship Center and Activity Center. Lobby, restroom, kitchen and Activity Center floors should be of a tile or tile like material. Most other spaces should be carpeted with the remainder left bare. Doors, frames, hardware, windows, ceilings, fixtures, casework, etc., are all intended to be consistent with a typical industry provided facility of this nature. The over-all facility should be appropriate for current sustainability standards.

Am #0002 - 3

Preliminary Soils Information:

For Pricing Purposes Only, See Attachment No. 2 – Preliminary Soils Information. The soils information is intended only to provide representative soils information located on Fort Bliss, Texas. Assume that the foundation type for the Chapel Complex will be continuous spread and/or spot spread footings (Same as indicated in Attachment 2 for the Combat Aviation Brigade.)”

(4) Section 01 10 00 Statement of Work, following Attachment 1 – Floor – Furniture Floor Plan, insert the attached Attachment No. 2

– Preliminary Soils Information.

2. This amendment is a part of the proposing papers and its receipt shall be acknowledged. All other conditions and requirements of the request for proposal remain unchanged. If the proposals have been mailed prior to receiving this amendment, you will notify the office where proposals are received, in the specified manner, immediately of its receipt and of any changes in your proposal occasioned thereby.

a. Hand-Carried Proposals shall be delivered to the U.S. Army Corps of Engineers, Omaha District, Contracting Division, 1616 Capitol Avenue, Omaha, Nebraska 68102-4901.

b. Mailed Proposals shall be addressed as noted in Item 8 on Page 00010-1 of Standard Form 1442.

c. Electronic Media. It is acceptable to provide pricing proposals by electronic media to the following address.

Email to

Diana.L.Vanderzanden@usace.army.mil or Ken.A.Spohn@usace.army.mil

It is recommended that once sent to either of the above email addresses, a phone call is made advising of the media of transmission.

To send pricing proposals by FAX, please send it to (402) 995-2081. Any message transmitted in this manner must be followed by a call advising of the media used and followed by a hard copy of the cost proposal sent to arrive in the office listed below the next business day.

Any electronic pricing (email or FAX) provided on the date required in the request for a cost proposal must be followed by a hard copy to arrive in the following office no later than the next business day (Monday through Friday).

U.S. Army Corps of Engineers, Omaha District CENWO-CT-M (Vanderzanden/Spohn) 1616 Capitol Avenue Omaha, NE 68102-4901

Am #0002 - 4

3. Offers will be received until 2:00 p.m., local time at place of receiving proposals, 3 JUL 2008.

Attachments:

Section 00 11 00, Standard Form SF1442 and CLIN Pricing Schedule Section 00 73 46 Preliminary Wage Determination Schedule (For Construction – TX080122 – Building dated 04/11/2008) Section 01 10 00, Attachment No. 2 – Preliminary Soils Information

U.S. Army Corps of Engineers, Omaha District 1616 Capitol Avenue Omaha, Nebraska 68102-4901

30 June 2008

DRL/2181

00 11 00 - 1

SOLICITATION, OFFER

AND AWARD

(Construction, Alteration, or Repair)

1. SOLICITATION NO.

W9128F-08-R-0033

2. TYPE OF SOLICITATION

SEALED BID (IFB)

X NEGOTIATED (RFP)

3. DATE ISSUED

29 MAY 2008

PAGES OF PAGES

IMPORTANT - The "offer" section on the reverse must be fully completed by offeror.

4. CONTRACT NO. 5. REQUISITION/PURCHASE REQUEST NO.

6. PROJECT NO.

7. ISSUED BY CODE CT 8. ADDRESS OFFER TO

U.S.ARMY CORPS OF ENGINEERS, OMAHA

Contracting Division (CENWO-CT) 1616 Capital Avenue Omaha, Nebraska 68102-4901

U.S.ARMY CORPS OF ENGINEERS, OMAHA

Attn: CONTRACTING DIVISION (CENWO-CT)

9. FOR INFORMATION

CALL:

A. NAME

DIANA VANDERZANDEN

B. TELEPHONE NO. (Include area code) (NO COLLECT CALLS)

(402) 995-2066

SOLICITATION

NOTE: In sealed bid solicitations "offer" and "offeror" mean "bid" and "bidder".

10. THE GOVERNMENT REQUIRES PERFORMANCE OF THE WORK DESCRIBED IN THESE DOCUMENTS (Title, identifying no., date):

The offeror hereby agrees to do all work described in the documents entitled:

CHAPEL COMPLEX

PN 02239

FORT BLISS, TEXAS

*BLOCK 13A. – REFER TO SECTION 00 22 11 FOR THE NUMBER OF COPIES TO BE SUBMITTED WITH THE ORIGINAL OFFER.

11. The Contractor shall begin performance within _10_________ calendar days and complete it within ____TBD___ calendar days after receiving award, notice to proceed. This performance period is mandatory, negotiable. (See_____________)

12A. THE CONTRACTOR MUST FURNISH ANY REQUIRED PERFORMANCE AND PAYMENT BONDS?

(If "YES," indicate within how many calendar days after award in Item 12B.)

YES NO

12B. CALENDAR DAYS

13. ADDITIONAL SOLICITATION REQUIREMENTS:

A. Sealed offers in original and ___*____ copies to perform the work required are due at the place specified in Item 8 by__1400___ (hour) local time 3 JUL 2008 (date). If this is a sealed bid solicitation, offers must be publicly opened at that time. Sealed envelopes containing offers shall be marked to show the offeror's name and address, the solicitation number, and the date and time offers are due.

B. An offer guarantee is, is not required.

C. All offers are subject to the (1) work requirements, and (2) other provisions and clauses incorporated in the solicitation in full text or by reference.

D. Offers providing less than __60______ calendar days for Government acceptance after the date offers are due will not be considered and will be rejected.

NSN 7540-01-155-3212 1442-101

STANDARD FORM 1442(REV. 4-85)

Prescribed by GSA FAR(48 CFR) 53.236-1(e)

Am #0002

00 11 00 - 2

14. NAME AND ADDRESS OF OFFEROR (Include ZIP Code) 15. TELEPHONE NO. (Include area code)

DUNS Number:

16. REMITTANCE ADDRESS (Include only if different than Item 14)

CODE FACILITY CODE

17. The offeror agrees to perform the work required at the prices specified below in strict accordance with the terms of this solicitation, if this offer is accepted by the Government in writing within ** calendar days after the date offers are due. (Insert any number equal to or greater than the minimum requirement

AMOUNTS

SEE ATTACHED CLIN PRICING SCHEDULE

Contractor’s Fax No.____________ CAGE CODE ________________ Contractor’s E-Mail address_______________

18. The offeror agrees to furnish any required performance and payment bonds.

19. ACKNOWLEDGMENT OF AMENDMENTS

(The offeror acknowledges receipt of amendments to the solicitation - give number and date of each)

AMENDMENT NO.

DATE

20A. NAME AND TITLE OF PERSON AUTHORIZED TO SIGN OFFER

(Type or print)

20B. SIGNATURE 20C. OFFER DATE

AWARD (To be completed by Government)

21. ITEMS ACCEPTED:

22. AMOUNT

23. ACCOUNTING AND APPROPRIATION DATA

24. SUBMIT INVOICES TO ADDRESS SHOWN IN

(4 copies unless otherwise specified)

ITEM

25. OTHER THAN FULL AND OPEN COMPETITION PURSUANT TO

10 U.S.C. 2304(c) ( ) 41 U.S.C. 253(c) ( )

26. ADMINISTERED BY CODE 27. PAYMENT WILL BE MADE BY

U.S. Army Engineer District, Omaha

USAED Omaha c/o USACE Finance Center 5722 Integrity Drive Millington, TN 38054-5005

CONTRACTING OFFICER WILL COMPLETE ITEM 28 OR 29 AS APPLICABLE

28. NEGOTIATED AGREEMENT (contractor is required to sign this document and return _______ copies to issuing office.) Contractor agrees to furnish and deliver all items or perform all work, requisitions identified on this form and any continuation sheets for the consideration stated in this contract. The rights and obligations of the parties to this contract shall be governed by (a) this contract award,

(b) the solicitation, and (c) the clauses, representations, certifications, and specifications incorporated by reference in or attached to this contract.

29. AWARD (Contractor is not required to sign this document.) Your offer on this solicitation, is hereby accepted as to the items listed. This award consummates the contract, which consists of (a) the Government solicitation and your offer, and (b) this contract award. No further contractual document is necessary.

30A. NAME AND TITLE OF CONTRACTOR OR PERSON AUTHORIZED

TO SIGN (Type or print)

31A. NAME OF CONTRACTING OFFICER (Type or print)

30B. SIGNATURE

30C. DATE 31B. UNITED STATES OF AMERICA

BY

31C. AWARD DATE

STANDARD FORM 1442 BACK (REV. 4-85)

Am #0002

CLIN SCHEDULE Attachment to 00 11 00 (SF1442) - 3 W9128F-08-R-0033

SOLICITATION NUMBER:________________________________

OFFEROR'S NAME:____________________________

CONTRACT LINE ITEM (CLIN) PRICING SCHEDULE

ITEM

NO.

DESCRIPTION QUANTITY UNIT UNIT

PRICE

LINE ITEM AMOUNT

Pre-Construction Services, Chapel Complex, PN 02239, at Fort Bliss, Texas.

Job

1- L.S.

XXX

OPTION

Building Construction, Chapel Complex, PN 02239, at Fort Bliss, Texas.

Job

1- L.S.

XXX

TOTAL OFFER ( ITEMS 0001 AND 0002) $_____________________

NOTES:

1. To summarize the requirements of Section 01 10 00 Statement of Work, the Omaha District will collaborate with successful offeror for Pre-Construction Services to develop a complete standard design “Chapel Complex” building. The Omaha District will work the design with the successful offeror on determining materials and methods of construction that will enable the facility to be built within the funds available. Item 0002 is an initial target price and determination regarding the feasibility of building any type of Chapel that meets the Standard design at a reasonable economical price. This may mean that the Government will make adjustments to design preferences in order to provide a complete standard design “Chapel Complex” building. This note does not lessen the requirements indicated in the solicitation.

Am #0002 TX080122 - 1 04/11/2008

General Decision Number: TX080122 04/11/2008 TX122

Superseded General Decision Number: TX20070126

State: Texas

Construction Type: Building

County: El Paso County in Texas.

BUILDING CONSTRUCTION PROJECTS (does not include single family homes or apartments up to and including 4 stories).

Modification Number Publication Date 0 02/08/2008 1 03/28/2008 2 04/11/2008

Section 00 73 46

Am #0002 TX080122 - 2 04/11/2008

ELEC0583-005 06/01/2006

Rates Fringes

ELECTRICIAN

(Including Low Voltage Wiring,HVAC Wiring, and Installation of fire alarms,security systems,telephones,and computers)..................$ 18.70 4.55+4.25%

* SFTX0669-001 04/01/2008

Rates Fringes

SPRINKLER FITTER (Fire Sprinklers)......................$ 25.30 13.30

SUTX2005-016 05/13/2005

Rates Fringes

BRICKLAYER.......................$ 13.45 0.00

Carpenter:

Acoustical Ceiling Installation................$ 10.45 0.00 Drywall and Metal Stud Installation................$ 10.79 0.00 Formbuilding/Formsetting....$ 13.15 2.29 All Other Work..............$ 14.26 0.00

Cauliker, Joint-Sealant..........$ 10.00 0.00

CEMENT MASON/CONCRETE FINISHER...$ 11.91 0.00

Drywall Finisher/Taper...........$ 8.78 0.00

Ironworker:

Reinforcing.................$ 8.83 0.00 Structural..................$ 10.23 0.36

Laborers:

Mason Tender Brick..........$ 10.47 0.00 Asbestos Removal from Floors, Walls and Ceilings..$ 10.00 0.00 Common......................$ 7.95 0.00 Mason Tender Cement.........$ 9.19 0.00

MECHANICAL INSULATOR, Duct and Pipe.........................$ 10.00 0.00

Painter:

Brush, Roller and Spray.....$ 9.17 0.00

PIPEFITTER.......................$ 18.15 0.00

Am #0002 TX080122 - 3 04/11/2008

PLASTERER........................$ 10.86 0.00

Plumber:

HV Pipe Only................$ 12.12 0.00 All Other Work..............$ 14.92 0.00

POWER EQUIPMENT OPERATOR:

Backhoe.....................$ 11.00 1.13 Crane.......................$ 16.43 0.46 Front End Loader............$ 10.23 0.00 Roller......................$ 8.33 0.00

Sheetmetal Worker:

HVAC Duct Only..............$ 11.10 0.00 All Other Work..............$ 9.76 1.47

Soft Floor Layers, Carpet and Vinyl............................$ 12.87 0.00

TILE FINISHER....................$ 8.01 0.00

TILE SETTER......................$ 12.02 0.00

TRUCK DRIVER.....................$ 9.00 0.00

WELDERS - Receive rate prescribed for craft performing operation to which welding is incidental.

Unlisted classifications needed for work not included within the scope of the classifications listed may be added after award only as provided in the labor standards contract clauses (29 CFR 5.5(a)(1)(ii)).

In the listing above, the "SU" designation means that rates listed under the identifier do not reflect collectively bargained wage and fringe benefit rates. Other designations indicate unions whose rates have been determined to be prevailing.

WAGE DETERMINATION APPEALS PROCESS

1.) Has there been an initial decision in the matter? This can be:

Am #0002 TX080122 - 4 04/11/2008

* an existing published wage determination

* a survey underlying a wage determination

* a Wage and Hour Division letter setting forth a position on a wage determination matter

* a conformance (additional classification and rate) ruling

On survey related matters, initial contact, including requests for summaries of surveys, should be with the Wage and Hour Regional Office for the area in which the survey was conducted because those Regional Offices have responsibility for the Davis-Bacon survey program. If the response from this initial contact is not satisfactory, then the process described in 2.) and 3.) should be followed.

With regard to any other matter not yet ripe for the formal process described here, initial contact should be with the Branch of Construction Wage Determinations. Write to:

Branch of Construction Wage Determinations Wage and Hour Division U.S. Department of Labor 200 Constitution Avenue, N.W.

Washington, DC 20210

2.) If the answer to the question in 1.) is yes, then an interested party (those affected by the action) can request review and reconsideration from the Wage and Hour Administrator (See 29 CFR Part 1.8 and 29 CFR Part 7).

Write to:

Wage and Hour Administrator U.S. Department of Labor 200 Constitution Avenue, N.W.

Washington, DC 20210

The request should be accompanied by a full statement of the interested party's position and by any information (wage payment data, project description, area practice material, etc.) that the requestor considers relevant to the issue.

3.) If the decision of the Administrator is not favorable, an interested party may appeal directly to the Administrative Review Board (formerly the Wage Appeals Board). Write to:

Am #0002 TX080122 - 5 04/11/2008

Administrative Review Board U.S. Department of Labor 200 Constitution Avenue, N.W.

Washington, DC 20210

4.) All decisions by the Administrative Review Board are final.

END OF GENERAL DECISION

COMBAT AVIATION BRIGADE (CAB)

(BIGGS ARMY AIRFIELD)

soils across the Combat Aviation Brigade complex project site, the subgrade soils are considered to be of generally low activity and are not anticipated to experience significant volumetric changes during periods of seasonal moisture fluctuations.

b. Foundation and Floor Slab Design Considerations.

(1) Foundation System. The most commonly used foundation system at Fort

Bliss is continuous spread and/or spot spread footings. Shallow footing foundations have a history of success in this area due to the competency of the near surface in situ soils and their ability to support the building loads. In addition, this system is quite economical when compared to other shallow alternatives. However, it should be noted that good performance has also been achieved with reinforced concrete ribbed mat slab foundations. Consideration is also given to deep foundation systems. A deep foundation system consisting of drilled piers is considered infeasible due to the presence of caving non-plastic (lower stratum) sands encountered at shallow depths across the site. A deep foundation system consisting of reinforced concrete driven piles is also considered infeasible and uneconomical (compared to shallow foundation alternatives) due to the very high relative densities encountered within the non-plastic (lower stratum) sands, which would be anticipated to cause pile driving ‘refusal’ at relatively shallow depths. Hence, a foundation system consisting of continuous spread and/or spot spread footings is considered the most suitable foundation system for the spectrum of structures associated with the Combat Aviation Brigade complex, and, therefore, is considered the most highly recommended foundation system. However, reinforced concrete ribbed mat slab foundations have also performed well at Fort Bliss, and optional foundation design requirements will be included for this foundation system.

(a) Spot Spread and/or Continuous Spread Footings. A foundation system consisting of spot spread and/or continuous spread footings is considered the optimal and most highly recommended foundation system to support the building structures of the

Attachment 2 - Preliminary Soils Information

Attachment 2 - 1 Am #0002

Combat Aviation Brigade complex. Based on analyses of standard penetration testing data gathered during the field investigation, the project subareas were consolidated into two groups of similar standard penetration test blow counts (N-values) with respect to depth for the purposes of providing allowable bearing capacity requirements for footing foundation elements. Specifically, Subareas 1, 2, 3, 4, 6, 7, and 8 were placed into one group and

Subareas 5 and 9 (in which moderately higher blow counts were recorded with respect to depth) were placed into a second group. In general, the footings should bear at a uniform depth to limit the potential for differential movements. Analyses were performed to determine the effects of placing footings at six different bearing depths for each grouping of project subareas. This was done to provide the structural designer options to address different loading conditions. The bearing depths considered for Subareas 1 through 4 and 6 through 8 are: (1) bearing footings within compacted nonexpansive fill placed above existing grade; (2) founding footings within the upper 2.5 feet of existing soils; (3) founding footings between 2.5 feet and

3.5 feet below existing grade; (4) founding footings between 3.5 feet and 4.0 feet below existing grade; (5) founding footings between 4.0 feet and 4.5 feet below existing grade; and

(6) founding footings at depths in excess of 4.5 feet below existing grade. The bearing depths considered for Subareas 5 and 9 are: (1) bearing footings within compacted nonexpansive fill placed above existing grade; (2) founding footings within the upper 2.5 feet of existing soils;

(3) founding footings between 2.5 feet and 3.0 feet below existing grade; (4) founding footings between 3.0 feet and 3.5 feet below existing grade; (5) founding footings between 3.5 feet and

4.5 feet below existing grade; and (6) founding footings at depths in excess of 4.5 feet below existing grade.

The allowable bearing capacities (qall) associated with the aforementioned bearing depths were calculated using the general bearing capacity equation, as presented in Chapter 4 of EM 1110-1-1905, dated 30 October 1992, subject: Bearing Capacity of Soils, and consider

Attachment 2 - 2 Am #0002 a factor of safety equal to 3. Schertmann’s Improved Settlement Method was used to predict the resulting settlements assuming full mobilization of the safe bearing pressure. In determining the appropriate bearing value to assign, total load deflections over a period of

5 years were held to approximately 1 inch or less and differential settlements were limited to

0.5-inch or less. The following table summarizes the results of the analyses. It should be noted that existing grade is the datum with respect to which the bearing depths provided.

Subareas 1, 2, 3, 4, 6, 7, and 8

Bearing Depth, feet qall, psf

Footings bearing w/-in fill 2000

0 – 2.5 SEE REQUIREMENTS BELOW

2.5 – 3.5 2000

3.5 – 4.0 2500

4.0 – 4.5 3000 > 4.5 3500

Subareas 5 and 8

Bearing Depth, feet qall, psf

Footings bearing w/-in fill 2000

0 – 2.5 SEE REQUIREMENTS BELOW

2.5 – 3.0 2000

3.0 – 3.5 2500

3.5 – 4.5 3000 > 4.5 3500

Due to the potential presence of loose to very loose sand in the upper 2.5 feet, it is recommended that footings should bear at least 2.5 feet below existing grade, if permitted by site grading requirements. If, due to site grading requirements, footings must be placed at depths shallower than 2.5 feet below existing grade, or if footings must be placed in fill above existing grade, the existing soils below the footings should be removed (excavated) to a depth of 2.5 feet below existing grade. Nonexpansive fill shall then be placed in controlled lifts not exceeding 8 inches in loose thickness and compacted to at least 92 percent of maximum laboratory density as determined in accordance with ASTM D 1557 between the excavation

Attachment 2 - 3 Am #0002 surface and the base of the footings. These earthwork (fill type and compaction) requirements also apply for footings that must be founded in fill above existing grade. Footings founded within fill above existing grade or at depths shallower than 2.5 feet below existing grade, in compliance with the earthwork requirements specified herein, should be sized for an allowable bearing pressure of 2,000 psf.

(b) Reinforced Concrete Ribbed Mat Slab Option. Alternatively, single-and two-story buildings that do not incorporate basements can be founded on a reinforced concrete ribbed mat slab. A ribbed mat slab consists of a grid of stiffening ribs cast monolithically with the floor slab. The monolithic nature of this system allows the foundation to span or cantilever areas where a loss of support may occur; thus potential differential settlements are spread over a large horizontal area by the ribs through soil-structure interaction. Based on the plasticity level and relative density and firmness of the near surface sandy and clayey soils, the mat slabs should be analyzed and designed for 1-inch of long-term differential movement. For this reason, interior ribs should be spaced no further than 15 feet center-to-center, and diagonal stiffener ribs should be placed at each corner of the mat slab.

Design of the ribbed mat slab should meet the minimum requirements as presented in CESWD-

ED-TS/G Criteria Letter, dated 29 January 1988 – Design Criteria for Ribbed Mat

Foundations, SWDED-G Criteria Letter, dated 16 April 1987 – Criteria for Developing

Geotechnical Design Parameters for SWD Ribbed Mat Design Methodology, and the recommendations provided herein.

Interior and exterior beams should bottom a minimum of 24 inches below outside finished grade. An allowable bearing capacity of 2.0 ksf (net) should be used to size the beams. For this phase of design, it should be noted that (1) the structural load is supported solely on the beam and the beam intersections, (2) load transfer occurs over the effective beam width, and (3) the beam and soil remain in contact. Beam intersections should be widened at

Attachment 2 - 4 Am #0002 column locations to accommodate the above allowable bearing value for the anticipated load condition. The load used to size the beams should consist of full dead load plus that portion of the live load that acts more or less continuously, usually 50 percent.

The ribbed mat slab foundations should incorporate adequate stiffness such that the deformations do not exceed the structural tolerance of any elements in the foundation or superstructure. Analyses should consider a vertical separation of the foundation slab and beams from the subgrade of 1 inch at the outside of all perimeter beams, with loss of support beneath the foundation over a horizontal distance of not less than 4.5 feet. This loss of support condition corresponds to the center lift mode. Additionally, edge lift analyses should consider an edge moisture variation distance equal to 3.0 feet, and an edge lift heave of 1 inch should be used in the design of the ribbed mat slab. This edge lift heave corresponds to an applied structural pressure of 100 psf. For edge lift considerations, two additional combinations of pressure and swell are required. For an allowable bearing capacity of 2.0 ksf, an edge lift heave of 0.75-inch can be expected to occur. At an ultimate bearing capacity of

6.0 ksf, 0.5-inch of heave should be anticipated. It should be noted that these anticipated heave amounts are based on the assumed removal of 2.0 feet of existing materials under building floor slabs and replacement with compacted nonexpansive fill, as recommended in this report.

A modulus of subgrade reaction equal to 200 psi/inch should be used when analyzing the ribbed mat slabs to determine in-service deformations. This value, however, should be factored to account for width effects such that kdesign=k1(Beff), where Beff is the effective beam width in feet. Design of the ribbed mat slabs shall use the SWD-AEIM sections as a minimum stiffness "first approximation".

Attachment 2 - 5 Am #0002

The mat slabs will, by design, be supported on-grade. A polyethylene vapor barrier

(6-mil minimum thickness) should be placed beneath the mat slabs, however, a capillary water barrier is not required.

Earthwork requirements (fill, compaction type, depth of removal of existing soils and replacement with nonexpansive fill) are the same for reinforced concrete ribbed mat slab foundations as those requirements specified for footing foundations in Paragraph 5.b.(1)(a), above.

(2) Floor Slab System and Subgrade Preparation Requirements. Due to the low plasticity levels of the in situ sands, building floor slabs can all be placed on-grade; however, proper subgrade preparation must be provided. In areas where the building pad will be built above grade, site preparation should consist of removing the top 6 inches of existing soils and replacing with compacted nonexpansive backfill material. The exposed subgrade after excavation operations should be scarified, moistened, manipulated, and recompacted to at least

90 percent of maximum laboratory density as determined in accordance with ASTM D 1557 prior to the placement of nonexpansive backfill materials. All fill required to achieve the final subgrade elevation(s) below the building floor slab(s) should be nonexpansive as well.

Nonexpansive fill shall be placed in controlled lifts not exceeding 8 inches in loose thickness and compacted to at least 95 percent of maximum laboratory density as determined in accordance with ASTM D 1557.

Subgrade preparation beneath building pads built in cut sections should consist of removing all existing materials to the elevation that corresponds to the bottom of the building floor slab. If the exposed subgrade is a medium to high plasticity clay, then 18 inches of the clay soils should be removed and replaced with nonexpansive backfill material. The top

6 inches of exposed subgrade should be scarified and recompacted to at least 90 percent of maximum laboratory density as determined in accordance with ASTM D 1557.

Attachment 2 - 6 Am #0002