Sherry Holtketter Office Manager sherry.holtketter@twinportstesting.com Mike Haapala Geotechnical Engineering & Construction Materials Manager mike.haapala@twinportstesting.com Tracy Jacobs Industrial Hygiene & Environmental Services Manager tracy.jacobs@twinportstesting.com Mike Olson Non-Destructive Testing Department Manager mike.olson@twinportstesting.com Stephen Sundeen Chemistry Lab Manager stephen.sundeen@twinportstesting.com