To: Purchasing

From: Jon Hagen

Date: 2-26-01

Subject: Sole source purchase - Siemens equipment

We are purchasing two pieces of computer equipment from Siemens: a disk storage unit and a combination equipment rack/power supply. Both of these items are needed as spares for the telescope pointing system. This pointing system, made for us by Vertex GMBH, uses a proprietary Siemens computer. All the modules in this computer are made only by Siemens. There are no other sources.

The items are:

6ES5 581 14L12 Mass Storage Module: $1486.82

6ES5 955 LC42 Power Supply Module $2388.00