Contact Visit us Our office is located at: 12002 Charles Drive Grass Valley, CA 95945 Call us (530) 272-2708 Office hours: Monday - Friday, 8:00am - 4:30pm David Matson / President ext. 201Peter Van Matre / Project Manager ext. 202Gary Wilhelm / Project Manager / Estimator / Quality Control ext. 203Kate Emrich / Office Manager ext. 200