# Northbrook Insurance Company

## Endorsement

**Named Insured:** International Business Machines Corp.
**Policy No.:** 63-003-053
**Endorsement No.:** 6 (Page 2 of 2)

### Collapse Hazard

The Collapse Hazard does not include property damage arising out of operations performed for any Insured by independent contractors, or included with the Completed Operations Hazard or the Underground Property Damage Hazard, or for which liability is assumed by any Insured under an Incidental Contract.

### Underground Property Damage Hazard

The Underground property damage hazard includes underground property damage as defined herein and property damage to any other property at any time resulting therefrom.

"Underground Property Damage" means property damage to wire, conduits, pipes, mains, sewers, tanks, tunnels, any similar property and any apparatus in connection therewith, beneath the surface of the ground or water, caused by and occurring during the use of mechanical equipment for the purpose of grading land, paving, excavating, drilling, burrowing, filling, back filling, or pile driving. The Underground Property Damage hazard does not include property damage arising out of operations performed for any Insured by independent contractors, or included within the Completed Operations Hazard, or for which liability is assumed by any Insured under an Incidental contract.

### Incidental Contract

"Incidental Contract" means any written (1) lease of premises, (2) easement agreement, except in connection with construction or demolition operations on or adjacent to a railroad, (3) undertaking to indemnify a municipality required by municipal ordinance, except in connection with work for the municipality, (4) side-track agreement, or (5) elevator maintenance agreement.

This endorsement to take effect on the 21st day of May 1977. All other terms and conditions remain unchanged.

**Countersigned:** May 20, 1977
**Authorized Representative:** [Signature]