CALL US TODAY Martinez, CA (925) 313-5800 | Signal Hill, CA (562) 427-6899 Menu ROTARY DRILLING & CORING SERVICES Highly experienced and dependable personnel FIND OUT MORE OUR SERVICES Delivering High Quality Environmental, Geotechnical And Marine Drilling & Testing Solutions For Over Thirty Five Years. WHAT'S NEW AT GREGG View older news → KEEP UP WITH THE LATEST NEWS The services we offer, equipment & technologies we utilize, and project experience. Sign up for our newsletter SIGN ME UP Please use the form below to e-mail us with any questions or project opportunities you may have. We will have the appropriate project manager return your request by the next business day. We hope to work with you soon. Select one* Request for proposal Question Comment SEND MESSAGE Our Offices We have two convenient locations. Open M-F 7AM to 5PM 950 Howe Road Martinez, California 94553 Job Related Questions & Cancellations: Jake Wilson Cost Estimates & Other Questions: Tim Boyd Phone: (925) 313-5800 Fax: (925) 313-0302 2726 Walnut Avenue Signal Hill, California 90755 Cost Estimates, Scheduling & Cancellations: Joanna McKeehan Phone: (562) 427-6899 Fax: (562) 427-3314 © 2017 Gregg Drilling LLC. All Rights Reserved. Site created by Logical Position