| Business | Phone |
| J P Cahorn Engineering Rr 3 Stn Delivery Centre, Peterborough K9J 6X4 | (705) 743-4642 |
| Klass Engineering 537 Homewood Ave, Peterborough K9H 2N4 | (705) 743-1076 |
| Ksander & Assoc 421 Water St, Peterborough K9H 3L9 | (705) 743-9221 |
| Landmark Associates Ltd 380 Armour Rd #140, Peterborough K9H 7L7 | (705) 742-3881 |
| M J Davenport & Assoc Ltd 169 Lansdowne St E #100, Peterborough K9J 7P7 | (705) 745-6676 |
| Otonabee Technical Svc Ltd 294 Rink St, Peterborough K9J 2K2 | (705) 745-5530 |
| Site Investigations Svc 785 The Kingsway, Peterborough K9J 6W7 | (705) 743-6850 |
| Spectrum Consulting Inc 544 Mcdonnel St, Peterborough K9H 2X8 | (705) 743-7520 |
| Geo-Logic Inc 347 Pido Rd, Peterborough K9J 6X7 | (705) 749-3317 |