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| [X] | Annual Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 |
|-----|--------------------------------------------------------------------------------|

| [  ] | Transition Report Pursuant to Section 15(d) of the Securities Exchange Act of 1934 |
|----------------|------------------------------------------------------------------------------------|

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Table of Contents

| Financial Information                  |                                                                                |
|----------------------------------------|-------------------------------------------------------------------------------------|
|                                   |                                                                                |   |
| Birdsall, Inc. Retirement Savings Plan |                                                                                |
|                                   | Cover Page                                                                          | 1 |
|                                   | Report of Independent Registered Public Accounting Firm                             | 2 |
|                                   | Financial Statements                                                                | 3 |
|                                   | Notes to Financial Statements                                                       | 5 |
|                                   | Form 5500, Schedule H, Part IV, Line 4(i), Schedule of Assets (Held at End of Year) | 11 |
|                                   |                                                                                |   |
| Other Information                      |                                                                                |
|                                   | Signature                                                                           | 13 |
|                                   | Exhibit Index                                                                       | 14 |
|                                   |                                                                                |   |

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Birdsall, Inc.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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|  Birdsall, Inc. Retirement Savings Plan                                   |   |
|--------------------------------------------------------------------------------|--------|
| Statements of Net Assets Available for Benefits                                |   |
|                                                                           |   |   |   |   |   |   |
|                                                                           |   | December 31 |   |
|                                                                           |   | 2010 |   |   | 2009 |   |
|                                                                           |   |   |   |   |   |   |
| Assets:                                                                        |   |   |   |   |   |   |
|   Participant-directed investments in trust, at fair value           |   | $ | 69,361,282 |   |   | $ | 62,872,411 |   |
|                                                                           |   |   |   |   |   |   |   |   |
|   Receivables:                                                       |   |   |   |   |   |   |   |   |
|     Employer contributions                                 |   |   | 248,169 |   |   |   | 22,276 |   |
|     Participant contributions                              |   |   | 50,857 |   |   |   | 39,553 |   |
|     Notes receivable from participants                     |   |   | 1,472,414 |   |   |   | 1,579,203 |   |
|                                                                           |   |   | 1,771,440 |   |   |   | 1,641,032 |   |
|                                                                           |   |   |   |   |   |   |   |   |
|            Total assets |   |   | 71,132,722 |   |   |   | 64,513,443 |   |
|                                                                           |   |   |   |   |   |   |   |   |
| Liabilities — Operating payables                               |   |   | 1,967 |   |   |   | 5,636 |   |
|                                                                           |   |   |   |   |   |   |   |   |
| Net assets available for benefits, at fair value                               |   |   | 71,130,755 |   |   |   | 64,507,807 |   |
|                                                                           |   |   |   |   |   |   |   |   |
| Adjustment from fair value to contract value for the stable value fund    |   |   | (938,015 | ) |   |   | (538,633 | ) |
|                                                                           |   |   |   |   |   |   |   |   |
| Net assets available for benefits                                              |   | $ | 70,192,740 |   |   | $ | 63,969,174 |   |
|                                                                           |   |   |   |   |   |   |   |   |
|                                                                           |   |   |   |   |   |   |   |   |
| The accompanying notes are an integral part of these statements.               |   |   |   |   |   |   |   |   |

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|  Birdsall, Inc. Retirement Savings Plan                                        |   |
|-------------------------------------------------------------------------------------|--------|
| Statements of Changes in Net Assets Available for Benefits                          |   |
|                                                                                |   |   |   |   |   |   |
|                                                                                |   | Year ended December 31 |   |
|                                                                                |   | 2010 |   |   | 2009 |   |
| Investment activities:                                                              |   |   |   |   |   |   |
|      Dividends on Nicor Inc. common stock                  |   | $ | 199,033 |   |   | $ | 213,037 |   |
|      Net change in market value of Nicor Inc. common stock |   |   | 820,627 |   |   |   | 871,642 |   |
|      Distributions from stable value fund                  |   |   | 682,784 |   |   |   | 715,666 |   |
|      Income from registered investment companies:          |   |   |   |   |   |   |   |   |
| Distributions                                                                       |   |   | 790,985 |   |   |   | 709,388 |   |
| Net investment gain:                                                                |   |   |   |   |   |   |   |   |
| Vanguard 500 Index Fund Investor Shares                                             |   |   | 1,469,324 |   |   |   | 2,201,012 |   |
| Vanguard Balanced Index Investment Fund                                             |   |   | 725,256 |   |   |   | 965,971 |   |
| Other registered investment companies                                               |   |   | 1,707,430 |   |   |   | 1,894,749 |   |
|      Other                                                 |   |   | 61,623 |   |   |   | 550 |   |
| Increase in Plan net assets derived  from investment activities           |   |   | 6,457,062 |   |   |   | 7,572,015 |   |
|                                                                                |   |   |   |   |   |   |   |   |
| Interest income on notes receivable from participants                               |   |   | 71,807 |   |   |   | 92,241 |   |
|                                                                                |   |   |   |   |   |   |   |   |
| Contributions:                                                                      |   |   |   |   |   |   |   |   |
|   Participant                                                             |   |   | 2,746,274 |   |   |   | 2,786,054 |   |
|   Employer                                                                |   |   | 1,837,560 |   |   |   | 1,593,096 |   |
|                                                                                |   |   | 4,583,834 |   |   |   | 4,379,150 |   |
|                                                                                |   |   |   |   |   |   |   |   |
| Transfers in                                                                        |   |   | 304,053 |   |   |   | - |   |
|                                                                                |   |   |   |   |   |   |   |   |
| Deductions:                                                                         |   |   |   |   |   |   |   |   |
|   Benefits paid to participants                                           |   |   | 5,082,221 |   |   |   | 2,955,541 |   |
|   Administrative expenses                                                 |   |   | 110,969 |   |   |   | 91,773 |   |
|                                                                                |   |   | 5,193,190 |   |   |   | 3,047,314 |   |
|                                                                                |   |   |   |   |   |   |   |   |
| Net increase                                                                        |   |   | 6,223,566 |   |   |   | 8,996,092 |   |
|                                                                                |   |   |   |   |   |   |   |   |
|                                                                                |   |   |   |   |   |   |   |   |
| Net assets available for benefits at beginning of year                              |   |   | 63,969,174 |   |   |   | 54,973,082 |   |
|                                                                                |   |   |   |   |   |   |   |   |
| Net assets available for benefits at end of year                                    |   | $ | 70,192,740 |   |   | $ | 63,969,174 |   |
|                                                                                |   |   |   |   |   |   |   |   |
|                                                                                |   |   |   |   |   |   |   |   |
| The accompanying notes are an integral part of these statements.                    |   |   |   |   |   |   |   |   |

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Birdsall, Inc. Retirement Savings Plan

| 1.   | DESCRIPTION OF THE PLAN |
|----------------|-------------------------|

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| 2.   | ACCOUNTING POLICIES |
|----------------|---------------------|

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| 3.   | INVESTMENTS |
|----------------|-------------|

|                                                                                                                  |   | 2010   |       |   | 2009   |   |
|-----------------------------------------------------------------------------------------------------------------------|--------|--------|------------|--------|--------|--------|
|                                                                                                                  |   |   |       |   |   |   |
| Vanguard 500 Index Fund Investor Shares                                                                               |   | $      | 12,916,047 |   |   | $      | 11,905,676 |   |
| Vanguard Balanced Index Investment Fund                                                                               |   |   | 7,648,628  |   |   |   | 7,038,293 |   |
| Nicor Inc. common stock                                                                                               |   |   | 6,421,354  |   |   |   | 4,609,035 |   |
| VRST**                                                                                                                |   |   | 23,820,730 |   |   |   | 24,915,772 |   |
|                                                                                                                  |   |   |       |   |   |   |   |   |
| **At December 31, 2010 and 2009, the contract values of the VRST were $22,882,715 and $24,377,139, respectively. |   |   |       |   |

|                                        |   | Quoted    |       |   |        |   |       |   |   |
|---------------------------------------------|--------|-----------|------------|--------|-------------|--------|------------|--------|--------|
|                                        |   | prices in |       |   | Significant |   |       |   |   |
|                                        |   | active    |       |   | observable  |   |       |   |   |
|                                        |   | markets   |       |   | inputs      |   |       |   |   |
|                                        |   | (Level 1) |       |   | (Level 2)   |   |       | Total  |   |
| December 31, 2010                           |   |      |       |   |        |   |       |   |   |
| Stable value fund                           |   | $         | -          |   |        | $      | 23,820,730 |   |   | $ | 23,820,730 |   |
| Nicor Inc. common stock                     |   |      | 6,421,354  |   |        |   | -          |   |   |   | 6,421,354 |   |
| Registered investment companies:            |   |      |       |   |        |   |       |   |   |   |   |   |
|    Bond funds                |   |      | 4,687,291  |   |        |   | -          |   |   |   | 4,687,291 |   |
|    Balanced funds            |   |      | 11,408,670 |   |        |   | -          |   |   |   | 11,408,670 |   |
|    Domestic stock funds      |   |      | 20,583,363 |   |        |   | -          |   |   |   | 20,583,363 |   |
|    International stock funds |   |      | 2,439,874  |   |        |   | -          |   |   |   | 2,439,874 |   |
|                                        |   | $         | 45,540,552 |   |        | $      | 23,820,730 |   |   | $ | 69,361,282 |   |
|                                        |   |      |       |   |        |   |       |   |   |   |   |   |
|                                        |   |      |       |   |        |   |       |   |   |   |   |   |
| December 31, 2009                           |   |      |       |   |        |   |       |   |   |   |   |   |
| Stable value fund                           |   | $         | -          |   |        | $      | 24,915,772 |   |   | $ | 24,915,772 |   |
| Nicor Inc. common stock                     |   |      | 4,609,035  |   |        |   | -          |   |   |   | 4,609,035 |   |
| Registered investment companies:            |   |      |       |   |        |   |       |   |   |   |   |   |
|    Bond funds                |   |      | 4,043,004  |   |        |   | -          |   |   |   | 4,043,004 |   |
|    Balanced funds            |   |      | 8,368,283  |   |        |   | -          |   |   |   | 8,368,283 |   |
|    Domestic stock funds      |   |      | 18,453,089 |   |        |   | -          |   |   |   | 18,453,089 |   |
|    International stock funds |   |      | 2,483,228  |   |        |   | -          |   |   |   | 2,483,228 |   |
|                                        |   | $         | 37,956,639 |   |        | $      | 24,915,772 |   |   | $ | 62,872,411 |   |

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| 4.   | EXEMPT PARTY-IN-INTEREST TRANSACTIONS |
|----------------|---------------------------------------|

| 5.   | FEDERAL INCOME TAX STATUS |
|----------------|---------------------------|

| 6.   | RECONCILIATION TO FORM 5500 |
|----------------|-----------------------------|

|                                                                            |   | 2010   |       |   | 2009   |   |
|---------------------------------------------------------------------------------|--------|--------|------------|--------|--------|--------|
|                                                                            |   |   |       |   |   |   |
| Net assets available for benefits per the financial statements                  |   | $      | 70,192,740 |   |   | $      | 63,969,174 |   |
| Adjustment from fair value to contract value for the stable value fund     |   |   | 938,015    |   |   |   | 538,633 |   |
| Less:  Deemed distributions included as expense in the Form 5500 |   |   | 4,132      |   |   |   | - |   |
| Net assets available for benefits per Form 5500                                 |   | $      | 71,126,623 |   |   | $      | 64,507,807 |   |

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|                                                                                                                                       |   | 2010   |      |   | 2009   |   |
|--------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|-----------|--------|--------|--------|
|                                                                                                                                       |   |   |      |   |   |   |
| Net increase per the financial statements                                                                                                  |   | $      | 6,223,566 |   |   | $      | 8,996,092 |   |
| Adjustment from fair value to contract value for the stable value fund                                                                |   |   | 399,382   |   |   |   | 538,633 |   |
| Less:  Transfers in per the financial statements                                                                                      |   |   | 304,053   |   |   |   | - |   |
|          Deemed distributions included in benefits paid to participants in the Form 5500 |   |   | 4,132     |   |   |   | - |   |
| Net income per Form 5500                                                                                                                   |   | $      | 6,314,763 |   |   | $      | 9,534,725 |   |

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|  Birdsall, Inc. Retirement Savings Plan                                                      |                                         |
|---------------------------------------------------------------------------------------------------|----------------------------------------------|
| Form 5500 — Schedule H, Part IV, Line 4(i) — Schedule of Assets (Held at End of Year) |                                         |
|  December 31, 2010                                                                           |                                         |
|                                                                                              |                                         |   |   |   |   |
|                                                                                              |                                         |   |   |   |   |
|                                                                                              | Identity of Issue, Borrower or Similar Party | Description of Investment |   | Current Value |   |
|                                                                                              |                                         |   |   |   |   |
| (A)                                                                                               | Nicor Inc.                                   | Common stock at $2.50 par value |   | $ | 6,421,354 |   |
| (A)                                                                                               | Various participants                         | Participant loans earning interest from 4.25% to 9.50%, maturing from 2011 to 2014 |   |   | 1,468,282 |   |
|                                                                                              | AIM Constellation Fund                       | Registered investment company |   |   | 40,923 |   |
|                                                                                              | AIM Dynamics Fund                            | Registered investment company |   |   | 250,562 |   |
|                                                                                              | American Century Int’l Growth          | Registered investment company |   |   | 1,494,422 |   |
|                                                                                              | American Century Equity Growth               | Registered investment company |   |   | 193,059 |   |
|                                                                                              | Columbia Acorn Int’l Fund              | Registered investment company |   |   | 60,758 |   |
|                                                                                              | Columbia Acorn USA Fund                      | Registered investment company |   |   | 901,301 |   |
|                                                                                              | Davis New York Venture                       | Registered investment company |   |   | 1,018,108 |   |
|                                                                                              | Fidelity Blue Chip Growth Fund               | Registered investment company |   |   | 364,605 |   |
|                                                                                              | Janus Investment Fund                        | Registered investment company |   |   | 334,197 |   |
|                                                                                              | Managers Special Equity Fund                 | Registered investment company |   |   | 1,719,763 |   |
| (A)                                                                                               | Vanguard 500 Index Fund Investor Shares      | Registered investment company |   |   | 12,916,047 |   |
| (A)                                                                                               | Vanguard Asset Allocation Fund               | Registered investment company |   |   | 453,326 |   |
| (A)                                                                                               | Vanguard Balanced Index Investment Fund      | Registered investment company |   |   | 7,648,628 |   |
| (A)                                                                                               | Vanguard Devel Mkts Index Fund               | Registered investment company |   |   | 884,694 |   |
| (A)                                                                                               | Vanguard GNMA Investors Fund                 | Registered investment company |   |   | 547,591 |   |
| (A)                                                                                               | Vanguard Growth Equity Fund                  | Registered investment company |   |   | 646,650 |   |
| (A)                                                                                               | Vanguard Growth Index Inv Fund               | Registered investment company |   |   | 285,352 |   |
| (A)                                                                                               | Vanguard LifeStrategy Conserv Growth         | Registered investment company |   |   | 4,168 |   |
| (A)                                                                                               | Vanguard LifeStrategy Growth Fund            | Registered investment company |   |   | 4,538 |   |
| (A)                                                                                               | Vanguard LifeStrategy Income Fund            | Registered investment company |   |   | 2,568 |   |
| (A)                                                                                               | Vanguard LifeStrategy Mod Growth             | Registered investment company |   |   | 10,663 |   |
| (A)                                                                                               | Vanguard LT Treasury Inv Fund                | Registered investment company |   |   | 1,025,303 |   |
| (A)                                                                                               | Vanguard Mid-Cap Value Index Inv Fund        | Registered investment company |   |   | 429,905 |   |
| (A)                                                                                               | Vanguard PRIMECAP Fund                       | Registered investment company |   |   | 992,151 |   |
| (A)                                                                                               | Vanguard Prime Money Mkt                     | Registered investment company |   |   | 76,069 |   |
| (A)                                                                                               | Vanguard Sm-Cap Value Index             | Registered investment company |   |   | 414,671 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2005 Fund            | Registered investment company |   |   | 29,588 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2010 Fund            | Registered investment company |   |   | 206,610 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2015 Fund            | Registered investment company |   |   | 893,260 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2020 Fund            | Registered investment company |   |   | 521,767 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2025 Fund            | Registered investment company |   |   | 387,347 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2030 Fund            | Registered investment company |   |   | 609,263 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2035 Fund            | Registered investment company |   |   | 186,835 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2040 Fund            | Registered investment company |   |   | 93,814 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2045 Fund            | Registered investment company |   |   | 158,909 |   |

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|  Birdsall, Inc. Retirement Savings Plan                                                      |                                         |
|---------------------------------------------------------------------------------------------------|----------------------------------------------|
| Form 5500 — Schedule H, Part IV, Line 4(i) — Schedule of Assets (Held at End of Year) |                                         |
|  December 31, 2010 (Continued)                                                               |                                         |
|                                                                                              |                                         |   |   |   |
|                                                                                              |                                         |   |   |   |   |
|                                                                                              | Identity of Issue, Borrower or Similar Party | Description of Investment |   |  Current Value |   |
|                                                                                              |                                         |   |   |   |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2050 Fund            | Registered investment company |   |   | 36,573 |   |
| (A)                                                                                               | Vanguard Tgt Retirement 2055 Fund            | Registered investment company |   |   | 1 |   |
| (A)                                                                                               | Vanguard Target Retirement Income            | Registered investment company |   |   | 160,812 |   |
| (A)                                                                                               | Vanguard Total Bond Market Ind               | Registered investment company |   |   | 3,114,397 |   |
| (A)                                                                                               | Vanguard Retirement Savings Trust            | Stable value fund |   |   | 23,820,730 |   |
|                                                                                              |                                         |   |   |   |   |   |
|                                                                                              | TOTAL                                        |   |   | $ | 70,829,564 |   |
|                                                                                              |                                         |   |   |   |   |   |
|                                                                                              |                                         |   |   |   |   |   |
| (A)                                                                                               | Denotes party-in-interest investment.        |   |   |   |   |   |

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Signature

|                      |   | Birdsall, Inc. Retirement Savings Plan    |   |
|---------------------------|--------|-------------------------------------------|--------|
|                      |   |                                      |   |
| Date:  June 15, 2011 |   | /s/ VAN KENT                              |   |
|                      |   | Van Kent                                  |   |
|                      |   | Assistant Vice President Human Resources, |   |
|                      |   | Tropical Shipping USA, LLC                |   |

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Exhibit Index

| Exhibit |   |                                                                                                         |
|---------|--------|--------------------------------------------------------------------------------------------------------------|
| Number  |   | Description of Document                                                                                      |
|    |   |                                                                                                         |
| 23.01   |   | Consent of Independent Registered Public Accounting Firm – Birdsall, Inc. Retirement Savings Plan |
|    |   |                                                                                                         |

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