<Page>
EXHIBIT 99.3
SEVENTH AMENDMENT TO COST SHARING NATIONAL
IRU AGREEMENT
THIS SEVENTH AMENDMENT TO COST SHARING NATIONAL IRU AGREEMENT
("Amendment") is made and entered into as of the ____ day of September 2000 (the
"Amendment Effective Date"), by and between LEVEL 3 COMUNICATIONS, LLC, a
Delaware limited liability company ("Grantor") and SPLITROCK SERVICES, INC., a
Delaware corporation ("Grantee"). This Amendment modified and amends that
certain Cost Sharing National IRU Agreement dated April 26, 1999 between Grantor
and Grantee (the "Agreement"). Capitalized terms used but not defined herein
shall have the meanings set forth in the Agreement.
RECITALS
A. Grantee desires to obtain an IRU in additional intercity fibers
within and along Segments of the Grantor System, and Grantor desires to convey
to Grantee an IRU in the additional fibers specified herein, subject to and in
accordance with the terms and provisions set forth in this Amendment.
B. The parties desire to amend the resale restrictions placed upon
Grantee's use of the Grantee Fibers, subject to and in accordance with the terms
and provisions set forth in this Amendment.
C. The parties desire to amend the Facilities Contribution and
Utility Charge for space and power utilized by Grantee in the Facilities,
subject to and in accordance with the terms and provisions set forth in this
Amendment.
TERMS OF AMENDMENT
Accordingly, in consideration of the foregoing and other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, Grantor and Grantee hereby agree as follows:
ARTICLE 1
SEGMENT REVISIONS
1.01 Segment 4c, which is that portion of the Grantor System between Kansas
City, Missouri and St. Louis, Missouri, is hereby ***. The parties recognize
that Grantee has paid to Grantor *** for the Segment, and said amount shall be
credited against *** Contributions that are owed by Grantee to Grantor.
1.02 The number of Grantee Fibers in Segment 12b, which is that portion of
the Grantor System between Ft. Worth, Texas and Dallas, Texas, is hereby ***.
The parties recognize that Grantee has paid to Grantor ***, which is the
difference between the fees previously due and payable for *** fibers and the
amount due for the *** fibers. Said amount shall be credited against ***
Contributions that are owed by Grantee to Grantor.
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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ARTICLE 2
ADDITIONAL FIBERS
2.01 Grantee desires to add fiber to certain Segments of the Grantor System
(collectively, the "Additional Intercity Fibers"), as specified in Exhibits
"A-1" and "A-2," attached hereto. Grantor shall initially provide Grantee with
an IRU in a portion of the Additional Intercity Fibers on the Scheduled
Completion Dates specified in Exhibit "A-1" (the "First Additional Intercity
Fibers"). Grantor shall then provide Grantee with an IRU in the remainder of the
Additional Intercity Fibers on the Scheduled Completion Dates specified in
Exhibit "A-2" (the "Second Additional Intercity Fibers").
2.02 Grantee shall pay to Grantor an IRU Contribution for the Additional
Intercity Fibers on a per Segment basis in the amounts specified in Exhibits
"A-1" and "A-2." The IRU Contribution shall be due from Grantee to Grantor with
respect to the Additional Intercity Fibers in each Segment as follows: (i) ***
percent (***%) on the Amendment Effective Date (which equates to ***), and (ii)
*** percent (***%) on the Acceptance Date of such Segment.
2.03 The Additional Intercity Fibers shall be considered Grantee Fibers
under the Agreement. The IRU with respect to Additional Intercity Fibers in a
Segment shall commence as of the IRU Effective Date of each Segment.
2.04 The parties recognize, acknowledge and agree that Grantee's purchase
of an IRU in the Additional Intercity Fibers replaces the Option contained in
Section 3.02 of the Agreement, and the Option shall be of no further force and
effect.
ARTICLE 3
RESALE OF GRANTEE FIBER
Section 15.04 of the Agreement shall be deleted and replaced as
follows:
Notwithstanding anything to the contrary contained in this
Agreement, Grantee covenants and agrees that prior to the fourth
anniversary of the Effective Date of the Agreement it may only
assign, sell, lease, sublease, transfer, grant an indefeasible
right of use or other similar right or interest in the IRU or the
Grantee Fibers in such Segment to anyone other than an Affiliate
if the following conditions are met:
(1) In the event that Grantee *** Grantee must provide Grantor
with prior written notice of such transfer, and ***
(2) In the event that Grantee *** Grantee must provide Grantor
with written notice of such transfer at least thirty (30)
days prior to the effective date of the transfer. The
parties recognize that under no circumstances shall Grantee
be permitted to exchange more than *** of the Grantee Fibers
in any Segment for ***. For purposes of this Agreement, in
the event Grantee receives *** in any Segment from a third
party, and such ***.
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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Nothing contained in this Section 15.04 shall prohibit the sale
of capacity over the Grantee Fibers. Nothing contained in this
Article 15 shall be deemed or construed to prohibit Grantor from
assigning or otherwise transferring this Agreement or from
selling, transferring, leasing, licensing, granting indefeasible
rights of use or entering into similar agreements or arrangements
with other Persons respecting any fibers and conduit constituting
a part of the Grantor System.
ARTICLE 4
FACILITIES SPACE
4.01 Section 7.03 of the Agreement, as amended by the Second Amendment,
shall be deleted and replaced as follows:
Grantor will provide Grantee during the Term segregated space in
the Facilities along the System Route for the placement of
Grantee's electronic and optronic equipment as specified in
Exhibit "K," attached hereto. Grantee shall pay to Grantor,
within *** banking days after the Acceptance Date of a Segment,
*** per square foot for the space to be occupied by Grantee in
each Facility along such Segment (as calculated in Exhibit "K")
(the "Facilities Contribution"). In the event Grantee determines
that it will ***, Grantor will, ***. Grantee shall pay Grantor
*** for *** ordered on or before ***. For orders placed after
***, Grantee shall pay Grantor the then current rate for ***.
4.02 The parties recognize the Grantee has previously ordered and paid for
space in Grantor's Facilities located in the following cities: ***, and that
Grantee no longer desires to utilize such space. As such, Grantee shall promptly
remove any of its Facilities located in such space and restore the space to a
condition suitable for another customer, in Grantor's reasonable discretion.
Grantor shall then credit *** against *** Contributions that are owed by Grantee
to Grantor.
4.03 In the event that Grantee has previously paid for space in any
Facility, other than the space referenced in Section 4.02 above, then any such
payment shall be credited against the Facilities Contribution for such space,
or, if such payment exceeds the Facilities Contribution, then against ***
Contributions that are owed by Grantee to Grantor.
4.04 Exhibit "K" attached hereto shall be inserted as Exhibit "K" in the
Agreement.
ARTICLE 5
RECURRING CHARGES
5.01 Section 13.02 of the Agreement, as amended by the First Amendment,
shall be deleted and replaced as follows:
In consideration for Grantor's responsibilities under Article 12,
subject to the adjustments described in Sections 13.03 and 13.05 (i)
Grantee shall pay to Grantor on the first (1st) day of each calendar
month, in advance,
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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with respect to each Segment, commencing with the Acceptance Date
of such Segment and continuing until the expiration of the Term
of the IRU with respect to such Segment, $*** per Route Mile
((for up to twelve (12) Grantee Fibers), $*** per Route Mile (for
up to sixteen (16) Grantee Fibers), and $*** per Route Mile (for
up to thirty-six (36) Grantee Fibers), (the "Monthly Charge");
and (ii) Grantee shall pay the following charges for the
consumption of power needed to operate Grantee's electronic and
optronic equipment: $*** per amp per month for AC power, and $***
per amp per month for DC power (collectively, the "Utility
Charge"). If Grantor incurs an increase in power charges for the
consumption of power needed to operate Grantee's electronic and
optronic equipment at Regeneration Facilities, Terminal
Facilities and Opamp Facilities along the Grantor System, Grantor
may increase the Utility Charge, however, said increase shall
occur not more than annually. Grantee shall notify Grantor in
writing of its initial power requirements within sixty (60) days
following execution of this Agreement, or any subsequent
amendments, as applicable, and shall provide Grantor written
updates for any increased power needs during the Term.
5.02 The parties recognize that Grantee has the right to utilize a minimum
of *** amps per rack or *** amps per *** square feet of space occupied in the
Facilities, and that Grantor and Grantee shall establish a power delivery
schedule for this power within thirty (30) days of the Amendment Effective Date.
ARTICLE 6
RATIFICATION
Except as amended by the First, Second, Third, Fourth, Fifth, Sixth
and this Seventh Amendment, the original terms and provisions of the Agreement
shall continue in full force and effect and the Agreement, as amended by the
First, Second, Third, Fourth, Fifth, Sixth and this Seventh Amendment, is hereby
ratified and confirmed.
IN WITNESS WHEREOF, Grantor and Grantee have executed this Amendment
as of the date first written above.
LEVEL 3 COMMUNICATIONS, LLC SPLITROCK SERVICES, INC.
By: By:
------------------------------ ---------------------------
Title: Title:
--------------------------- ------------------------
Date: Date:
---------------------------- -------------------------
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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EXHIBIT "A-1"
FIRST ADDITIONAL INTERCITY FIBERS
SEGMENTS/CITY PAIRS
<Table>
<Caption>
FIRST
ADDITIONAL
INTERCITY
ESTIMATED FIBERS ESTIMATED IRU IRU SCHEDULED
ROUTE SEGMENT CITY PAIRS ROUTE MILES ORDERED FEE COMPLETION DATE
- -----------------------------------------------------------------------------------------------------------------
NORTHWEST DISTRICT
4e Las Vegas to Ogden 476 *** *** ***
Salt Lake City to Ogden 35 *** *** ***
13a Sacramento to Portland 643 *** *** ***
13b Portland to Seattle 193 *** *** ***
18a Seattle to Boise 550 *** *** ***
18b Boise to Ogden 395 *** *** ***
Regional Total 2,257 ***
N.CALIFORNIA DISTRICT
2a San Jose to San Francisco 45 *** *** ***
2b San Jose to San Luis Obispo 198 *** *** ***
2c San Luis Obispo to Los Angeles 244 *** *** ***
2d San Francisco to Oakland 10 *** *** ***
2e Oakland to Sacramento 85 *** *** ***
Regional Total 582 ***
PHOENIX DISTRICT
4a1 LA to San Bernardino 67 *** *** ***
4a2 San Bernardino to Las Vegas 229 *** *** ***
8 LA to San Diego 165 *** *** ***
12a San Diego to Phoenix 355 *** *** ***
12c Phoenix to Santa Teresa (El
Paso) 417 *** *** ***
Regional Total 1,233 ***
DENVER DISTRICT
4b St. Louis to Chicago 299 *** *** ***
4c Kansas City to St. Louis 302 *** *** ***
4d Omaha to Kansas City 215 *** *** ***
4f Ogden to Denver 603 *** *** ***
4g Denver to Omaha 554 *** *** ***
12e Santa Teresa (El Paso) to
Stratford 471 *** *** ***
14a Denver to Stratford 358 *** *** ***
Regional Total 2,802 ***
TEXAS DISTRICT
5c Dallas to Memphis 514 *** *** ***
5e Memphis to Nashville 251 *** *** ***
7 Dallas to Houston 247 *** *** ***
11b Houston to New Orleans 366 *** *** ***
11c1 New Orleans to Tallahassee 481 *** *** ***
12b Ft. Worth to Dallas 30 *** *** ***
12d Stratford to Ft. Worth 424 *** *** ***
19a San Antonio to Houston 218 *** *** ***
19b San Antonio to Austin 79 *** *** ***
19c Austin to Ft. Worth 208 *** *** ***
Regional Total 2,818 ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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<Table>
<Caption>
FIRST
ADDITIONAL
INTERCITY
ESTIMATED FIBERS ESTIMATED IRU IRU SCHEDULED
ROUTE SEGMENT CITY PAIRS ROUTE MILES ORDERED FEE COMPLETION DATE
- -----------------------------------------------------------------------------------------------------------------
SOUTHEAST DISTRICT
5d Louisville to Cincinnati 126 *** *** ***
5f Nashville to Louisville 230 *** *** ***
9b Atlanta to Charlotte 253 *** *** ***
9d Charlotte to Raleigh 200 *** *** ***
10a Atlanta to Jacksonville 350 *** *** ***
10b Orlando to Miami 252 *** *** ***
10c Jacksonville to Orlando 141 *** *** ***
11a Tampa to Miami 300 *** *** ***
11c2 Tallahassee to Tampa 244 *** *** ***
17 Nashville to Atlanta 381 *** *** ***
Regional Total 2,477 ***
NORTHEAST DISTRICT
1a Newark to New York 16 *** *** ***
1b Princeton to Newark 42 *** *** ***
1c Philadelphia to Princeton 61 *** *** ***
1d Wilmington to Philadelphia 37 *** *** ***
6a New York to Stamford 45 *** *** ***
6b Providence to Boston 49 *** *** ***
6d Stamford to Hartford 96 *** *** ***
6e Hartford to Providence 81 *** *** ***
15a Cleveland to Buffalo 192 *** *** ***
15b Albany to Boston 175 *** *** ***
Regional Total 794 ***
NEW YORK DISTRICT
1e Baltimore to Wilmington 79 *** *** ***
1f Washington DC to Baltimore 78 *** *** ***
3a Chicago to Detroit 324 *** *** ***
3b Pittsburgh to Washington DC 272 *** *** ***
3c Detroit to Cleveland 190 *** *** ***
3d Cleveland to Pittsburgh 162 *** *** ***
5a Chicago to Indianapolis 239 *** *** ***
5b Indianapolis to Cincinnati 114 *** *** ***
9a Richmond to Washington DC 120 *** *** ***
9c Raleigh to Richmond 175 *** *** ***
Regional Total 1,727 ***
E.CANADA DISTRICT
15c Toronto to Buffalo 111 *** *** ***
15d Montreal to Albany 240 *** *** ***
15e Toronto to Ottawa 260 *** *** ***
15f Ottawa to Montreal 103 *** *** ***
Regional Total 714 *** *** ***
***
NETWORK TOTAL ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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EXHIBIT "A-2"
SECOND ADDITIONAL INTERCITY FIBERS
SEGMENTS/CITY PAIRS
<Table>
<Caption>
FIRST
ADDITIONAL
INTERCITY
ESTIMATED FIBERS ESTIMATED IRU IRU SCHEDULED
ROUTE SEGMENT CITY PAIRS ROUTE MILES ORDERED FEE COMPLETION DATE
- -----------------------------------------------------------------------------------------------------------------
NORTHWEST DISTRICT
4e Las Vegas to Ogden 476 *** *** ***
Salt Lake City to Ogden 35 *** *** ***
13a Sacramento to Portland 643 *** *** ***
13b Portland to Seattle 193 *** *** ***
18a Seattle to Boise 550 *** *** ***
18b Boise to Ogden 395 *** *** ***
REGIONAL TOTAL 2,257 ***
N.CALIFORNIA DISTRICT
2a San Jose to San Francisco 45 *** *** ***
2b San Jose to San Luis Obispo 198 *** *** ***
2c San Luis Obispo to Los
Angeles 244 *** *** ***
2d San Francisco to Oakland 10 *** *** ***
2e Oakland to Sacramento 85 *** *** ***
REGIONAL TOTAL 582 ***
PHOENIX DISTRICT
4a1 LA to San Bernardino 67 *** *** ***
4a2 San Bernardino to Las Vegas 229 *** *** ***
8 LA to San Diego 165 *** *** ***
12a San Diego to Phoenix 355 *** *** ***
12c Phoenix to Santa Teresa (El
Paso) 417 *** *** ***
Regional Total 1,233 ***
DENVER DISTRICT
4b St. Louis to Chicago 299 *** *** ***
4c Kansas City to St. Louis 302 *** *** ***
4d Omaha to Kansas City 215 *** *** ***
4f Ogden to Denver 603 *** *** ***
4g Denver to Omaha 554 *** *** ***
12e Santa Teresa (El Paso) to 471 *** *** ***
Stratford
14a Denver to Stratford 358 *** *** ***
Regional Total 2,802 ***
TEXAS DISTRICT
5c Dallas to Memphis 514 *** *** ***
5e Memphis to Nashville 251 *** *** ***
7 Dallas to Houston 247 *** *** ***
11b Houston to New Orleans 366 *** *** ***
11c1 New Orleans to Tallahassee 481 *** *** ***
12b Ft. Worth to Dallas 30 *** *** ***
12d Stratford to Ft. Worth 424 *** *** ***
19a San Antonio to Houston 218 *** *** ***
19b San Antonio to Austin 79 *** *** ***
19c Austin to Ft. Worth 208 *** *** ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
PAGE 7
<Page>
<Table>
<Caption>
FIRST
ADDITIONAL
INTERCITY
ESTIMATED FIBERS ESTIMATED IRU IRU SCHEDULED
ROUTE SEGMENT CITY PAIRS ROUTE MILES ORDERED FEE COMPLETION DATE
- -----------------------------------------------------------------------------------------------------------------
Regional Total 2,818 ***
SOUTHERN DISTRICT
5d Louisville to Cincinnati 126 *** *** ***
5f Nashville to Louisville 230 *** *** ***
9b Atlanta to Charlotte 253 *** *** ***
9d Charlotte to Raleigh 200 *** *** ***
10a Atlanta to Jacksonville 350 *** *** ***
10b Orlando to Miami 252 *** *** ***
10c Jacksonville to Orlando 141 *** *** ***
11a Tampa to Miami 300 *** *** ***
11c2 Tallahassee to Tampa 244 *** *** ***
17 Nashville to Atlanta 381 *** *** ***
Regional Total 2,477 ***
NOTHEAST DISTRICT
1a Newark to New York 16 *** *** ***
1b Princeton to Newark 42 *** *** ***
1c Philadelphia to Princeton 61 *** *** ***
1d Wilmington to Philadelphia 37 *** *** ***
6a New York to Stamford 45 *** *** ***
6b Providence to Boston 49 *** *** ***
6d Stamford to Hartford 96 *** *** ***
6e Hartford to Providence 81 *** *** ***
15a Cleveland to Buffalo 192 *** *** ***
15b Albany to Boston 175 *** *** ***
Regional Total 794 ***
NEW YORK DISTRICT
1e Baltimore to Wilmington 79 *** *** ***
1f Washington DC to Baltimore 78 *** *** ***
3a Chicago to Detroit 324 *** *** ***
3b Pittsburgh to Washington DC 272 *** *** ***
3c Detroit to Cleveland 190 *** *** ***
3d Cleveland to Pittsburgh 162 *** *** ***
5a Chicago to Indianapolis 239 *** *** ***
5b Indianapolis to Cincinnati 114 *** *** ***
9a Richmond to Washington DC 120 *** *** ***
9c Raleigh to Richmond 175 *** *** ***
Regional Total 1,727 ***
E.CANADA DISTRICT
15c Toronto to Buffalo 111 *** *** ***
15d Montreal to Albany 240 *** *** ***
15e Toronto to Ottawa 260 *** *** ***
15f Ottawa to Montreal 103 *** *** ***
Regional Total 714 *** *** ***
NETWORK TOTAL ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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EXHIBIT "K"
GRANTEE SPACE REQUIREMENTS
<Table>
<Caption>
ADDITIONAL SQUARE FEET AVAILABLE
(APPROXIMATELY)
- -------------------------------------------------------------------------------------------------------------
ASSIGNED
FACILITY TYPE SEGMENT/SITE LOCATION SPACE* HUTS 3 & 4** HUTS 5 & 6***
- -------------------------------------------------------------------------------------------------------------
LAS VEGAS TO OGDEN
*** Coyote Springs *** ***
*** Monument Canyon *** ***
*** Yale Crossing *** ***
*** Millford, UT *** ***
*** Delta (Oasis) *** ***
*** Lofgreen *** ***
*** Ogden *** ***
SACRAMENTO TO PORTLAND
*** Colusa (Fagan) *** ***
*** Corning (Tehama) (RedBluff) *** ***
*** Palo Cedro (Oak Run ) *** ***
*** Burney (Hors Four Corners ) *** ***
*** Tionesta (Homestead)(Copic) *** ***
*** Modoc Pt. *** ***
*** Chemult (Paunina) *** ***
*** Oakridge (Westfir) *** ***
*** Eugene (Swain) *** ***
*** Salem *** ***
PORTLAND TO SEATTLE
*** Ostrander *** ***
*** Olympia *** ***
SEATTLE TO BOISE
*** North Bend (Issaquah) *** ***
*** Cle Elum (Easton) *** ***
*** Fruitvale (Cottonwoods) *** ***
*** Prosser (Byron) *** ***
*** Rieth (Stanfield) *** ***
*** LaGrande (Pelican) Creek *** ***
*** Durkee (Oxman) (Ebell Creek) *** ***
*** Ontario *** ***
BOISE TO OGDEN
*** Boise *** ***
*** Reverse *** ***
*** Gooding *** ***
*** Rupert *** ***
*** Bridge *** ***
*** Howelll *** ***
SAN JOSE TO SAN FRANCISCO
SAN JOSE TO SAN LUIS OBISPO
*** San Martin (Salinas) *** ***
*** Soledad *** ***
*** San Ardo *** ***
*** San Luis Obispo *** ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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<Page>
<Table>
<Caption>
ADDITIONAL SQUARE FEET AVAILABLE
(APPROXIMATELY)
- -------------------------------------------------------------------------------------------------------------
ASSIGNED
FACILITY TYPE SEGMENT/SITE LOCATION SPACE* HUTS 3 & 4** HUTS 5 & 6***
- -------------------------------------------------------------------------------------------------------------
SAN LUIS OBISPO TO LOS ANGELES
*** Whitehills (Lompoc) *** ***
*** Santa Barbara *** ***
*** Ventura *** ***
*** Moorpark *** ***
SAN FRANCISCO TO OAKLAND
*** Oakland *** ***
OAKLAND TO SACRAMENTO
*** Suisun (Fairfield) (Jacksnipe Station) *** ***
OAKLAND TO SAN JOSE
LA TO SAN BERNARDINO
SAN BERNARDINO TO LAS VEGAS
*** San Bernardino *** ***
*** Slash X (Barstow) *** ***
*** Silver Lake *** ***
*** Primm (Kearny Pass) *** ***
LA TO SAN DIEGO
*** Corona *** ***
*** Escondido *** ***
SAN DIEGO TO PHOENIX
*** Live Oak Springs *** ***
*** El Centro *** ***
*** Yuma *** ***
*** Growler *** ***
*** Agua Caliente Rd *** ***
PHOENIX TO SANTA TERESA
*** La Palma *** ***
*** Tucson *** ***
*** Sibyl *** ***
*** Olga *** ***
*** Separ *** ***
*** Myndus *** ***
ST. LOUIS TO CHICAGO
*** Plainview *** ***
*** Springfield *** ***
*** Bloomington *** ***
*** Odell *** ***
*** Joliet *** ***
KANSAS CITY TO ST. LOUIS
*** Centerview *** ***
*** Syracuse *** ***
*** Tebbetts *** ***
*** Marthasville *** ***
OMAHA TO KANSAS CITY
*** Howe *** ***
*** Lancaster *** ***
OGDEN TO DENVER
*** Wahsatch *** ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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<Page>
<Table>
<Caption>
ADDITIONAL SQUARE FEET AVAILABLE
(APPROXIMATELY)
- -------------------------------------------------------------------------------------------------------------
ASSIGNED
FACILITY TYPE SEGMENT/SITE LOCATION SPACE* HUTS 3 & 4** HUTS 5 & 6***
- -------------------------------------------------------------------------------------------------------------
*** Carter (Elkhurst) *** ***
*** Green River *** ***
*** Monell *** ***
*** Rawlins *** ***
*** Medicine Bow *** ***
*** Laramie *** ***
*** Stateline *** ***
*** Platteville *** ***
DENVER TO OMAHA
*** Weld Co. *** ***
*** Platner *** ***
*** Haigler *** ***
*** Culbertson *** ***
*** Edison *** ***
*** Heartwell *** ***
*** Grafton *** ***
*** Lincoln *** ***
SANTA TERESA TO STRATFORD
*** Orogrande (Elwood) *** ***
*** Tularosa *** ***
*** Ancho *** ***
*** Duran *** ***
*** Santa Rosa *** ***
*** Tucumcari *** ***
*** Romero *** ***
*** Stratford *** ***
DENVER TO STRATFORD
*** Spruce (Monument) *** ***
*** Pinon (Pueblo) *** ***
*** Rocky Ford (N.Lajunta) *** ***
*** Frick *** ***
*** Campo (Baca Co. Line) *** ***
DALLAS TO MEMPHIS
*** Edgewood *** ***
*** Newsome *** ***
*** Roach *** ***
*** Guernsey *** ***
*** Arkadelphia *** ***
*** Little Rock *** ***
*** Biscoe *** ***
*** Widener *** ***
MEMPHIS TO NASHVILLE
*** Walnut *** ***
*** Lutts *** ***
*** Rockdale *** ***
DALLAS TO HOUSTON
*** Corsicana *** ***
*** Robbins *** ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
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<Page>
<Table>
<Caption>
ADDITIONAL SQUARE FEET AVAILABLE
(APPROXIMATELY)
- -------------------------------------------------------------------------------------------------------------
ASSIGNED
FACILITY TYPE SEGMENT/SITE LOCATION SPACE* HUTS 3 & 4** HUTS 5 & 6***
- -------------------------------------------------------------------------------------------------------------
*** Dacus *** ***
HOUSTON TO NEW ORLEANS
*** Raywood (Devers) (N. Willis) *** ***
*** Pinehurst (Hwy 90/SR 109) *** ***
*** Iowa (Kinder) (Mermentau) *** ***
*** Lafayette (Krotz Springs) (Oliver Sta.) *** ***
*** Baton Rouge (Chacahoula) *** ***
*** Sorrento *** ***
NEW ORLEANS TO TALLAHASSEE
*** Pearlington (Kiln) *** ***
*** Poplarville (White Crossing) *** ***
*** Hutson Lake *** ***
*** Mobile *** ***
*** Pensacola *** ***
*** Crestview *** ***
*** Bruce (Bonifay) *** ***
*** Clarksville (Sneads) *** ***
*** Tallahassee *** ***
FT. WORTH TO DALLAS
STRATFORD TO FT. WORTH
*** Dumas *** ***
*** Amarillo *** ***
*** Ashtola (Goodnight) *** ***
*** Carey *** ***
*** Tolbert *** ***
*** Wichita Falls *** ***
*** Fruitland *** ***
SAN ANTONIO TO HOUSTON
*** Luling *** ***
*** Weimar *** ***
*** East Bernard *** ***
SAN ANTONIO TO AUSTIN
*** Hunter *** ***
AUSTIN TO FT. WORTH
*** Bartlett *** ***
*** Waco *** ***
*** Itasca *** ***
LOUISVILLE TO CINCINNATI
*** Rexville *** ***
NASHVILLE TO LOUISVILLE
*** Reubensville *** ***
*** Nash *** ***
*** Irvington *** ***
ATLANTA TO CHARLOTTE
*** Bogart *** ***
*** Gluck *** ***
*** Spartanburg *** ***
CHARLOTTE TO RALEIGH
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
PAGE 12
<Page>
<Table>
<Caption>
ADDITIONAL SQUARE FEET AVAILABLE
(APPROXIMATELY)
- -------------------------------------------------------------------------------------------------------------
ASSIGNED
FACILITY TYPE SEGMENT/SITE LOCATION SPACE* HUTS 3 & 4** HUTS 5 & 6***
- -------------------------------------------------------------------------------------------------------------
*** Salisbury *** ***
*** Greensboro *** ***
*** Oaks *** ***
ATLANTA TO JACKSONVILLE
*** Flovilla *** ***
*** Gordon *** ***
*** Tarrytown *** ***
*** Surrency *** ***
*** Newell *** ***
ORLANDO TO MIAMI
*** Kenansville *** ***
*** Marcy *** ***
*** Bannock *** ***
JACKSONVILLE TO ORLANDO
*** St. Augustine *** ***
*** Deland *** ***
TAMPA TO MIAMI
*** Waterbury *** ***
*** E. Farmers Rd *** ***
*** Goodno *** ***
*** Deem City *** ***
TALLAHASSEE TO TAMPA
*** Perry *** ***
*** Chiefland *** ***
*** Chassahowtzka *** ***
NASHVILLE TO ATLANTA
*** Shelbyville *** ***
*** Huntsville *** ***
*** Blountsville *** ***
*** Birmingham *** ***
*** Howells Cove *** ***
*** Tallapoosa *** ***
STAMFORD TO HARTFORD
*** Bridgewater *** *** ***
HARTFORD TO PROVIDENCE
*** Chepachet, RI (Providence) *** *** ***
CLEVELAND TO BUFFALO
*** Saybrook *** ***
*** Wesleyville (Erie) *** ***
*** Sheridan *** ***
ALBANY TO BOSTON
*** Chicopee (Springfield) *** ***
*** Auburn (Worcester) *** ***
*** Stockbridge (Lee) *** ***
BALTIMORE TO WILMINGTON
*** Perryville *** *** ***
WASHINGTON DC TO BALTIMORE
*** Millersville *** *** ***
</Table>
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
PAGE 13
<Page>
<Table>
<Caption>
ADDITIONAL SQUARE FEET AVAILABLE
(APPROXIMATELY)
- -------------------------------------------------------------------------------------------------------------
ASSIGNED
FACILITY TYPE SEGMENT/SITE LOCATION SPACE* HUTS 3 & 4** HUTS 5 & 6***
- -------------------------------------------------------------------------------------------------------------
CHICAGO TO DETROIT
*** Gary *** ***
*** Niles *** ***
*** Kalamazoo *** ***
*** Albion *** ***
*** Dexter (Ann Arbor) *** ***
PITTSBURGH TO WASHINGTON DC
*** Uniontown *** ***
*** Cumberland *** ***
*** Big Pool *** ***
*** Frederick *** ***
DETROIT TO CLEVELAND
*** Toledo *** ***
*** Kimball *** ***
CLEVELAND TO PITTSBURGH
*** Akron *** ***
*** Columbiana (Kent State) (Salem) *** ***
CHICAGO TO INDIANAPOLIS
*** Crown Point *** ***
*** Wolcott *** ***
*** Frankfort *** ***
INDIANAPOLIS TO CINCINNATI
*** Greensburg *** ***
RICHMOND TO WASHINGTON DC
*** Dahlgren (Newburg) *** ***
RALEIGH TO RICHMOND
*** Wise *** ***
*** Dinwiddie *** ***
TORONTO TO BUFFALO
*** Hamilton *** ***
MONTREAL TO ALBANY
*** Beekmantown *** ***
*** Factoryville *** ***
*** Moreau (Ft. Edward) *** ***
*** Albany *** ***
TORONTO TO OTTAWA
*** Peterborough *** ***
*** Tweed *** ***
*** Perth *** ***
OTTAWA TO MONTREAL
*** Ottawa *** ***
*** Champlain *** ***
*** Montreal *** ***
NEWARK TO PHILIDELPHIA
*** Princeton *** *** ***
</Table>
*The Assigned Space is the space allocated to Grantee for the Grantee Fibers
that have been ordered by Grantee as specified in Exhibit "B" to the Agreement
(as amended in the Second Amendment).
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
PAGE 14
<Page>
<Table>
<Caption>
ADDITIONAL SQUARE FEET AVAILABLE
(APPROXIMATELY)
- -------------------------------------------------------------------------------------------------------------
ASSIGNED
FACILITY TYPE SEGMENT/SITE LOCATION SPACE* HUTS 3 & 4** HUTS 5 & 6***
- -------------------------------------------------------------------------------------------------------------
</Table>
** Huts 3 & 4 will be available by ***
*** Huts 5 & 6 will be available by ***
Space and power will be delivered in accordance with the then existing Level 3
Dark Fiber Design Guidelines.
CONFIDENTIAL - SEVENTH AMENDMENT CONFIDENTIAL TREATMENT REQUEST
PAGE 15