Experienced. Dependable. Innovative.

“John, I have never worked with a PM that worked so hard to maintain excellent communication with me, the contractor and your own crew to make sure everyone had what they needed, were on the same page and the job was a success. I couldn’t believe how smooth everything ran thanks to your efforts.” – Jason Miller, Rinconada Water Treatment Plant

“I wanted to let you know that Juan, Jose and Frank did an excellent job with the well abandonments at Miramar. I really appreciated their thoroughness and professionalism, they were great to work with!” – Joseph Plummer, Bay West

“My name is Sarah Winn, I work for Kleinfelder, And I had the pleasure of working with one of your drill teams for this last project. I have to say they are the best drillers I have ever worked with. Not only were they fast and efficient, they were also safe, kind, hilarious and very clean. They took extra care to even sweep up tire marks so that property owners, who are forced to allow us on their land because of court orders, did not feel like we left a trace. Even the environmental biologists on site were impressed, with Christy at ESA taking photos to use as an example to other sites.”

“Just wanted to let you know that our field team had a really positive experience working with the crew out in Redwood City over the past two weeks. They specifically mentioned that Christian and Rodrigo were “very professional, worked their butts off, were great at communicating/listening/answering questions, and were just great guys to work with.” I would definitely request them again on future projects.

I’ve worked with Rodrigo several times over the last four years and definitely agree with this praise, and from the few times I’ve worked with Christian, I’m not surprised to hear this kind of feedback either. Thanks to you too for putting together such a great team and making it such an easy job out there.” – Nick Frederiksen, Sr. Staff Geologist, Geosyntec

“I wanted to also thank you for putting together the well organized and highly valuable Field Day on Saturday [March 11, 2023]. It was excellent! It was a great experience for our staff of varying experience levels, from entry level geologist to Principal level. I also really appreciated that Gregg included the gender diversity that does exist in this line of work.  Visibility is so important- for the new graduates especially, so it is always nice to hear and learn from experienced women in the industry.

Thanks again, and great job to all of you who helped plan and deliver the Field Day.” – Jamie Cachine, BSNC

“I just wanted to pass along how happy I was with Keith’s, and his team’s, performance on my project in Los Angeles last week. Access was the most difficult that I’ve encountered in my 30+ years of fieldwork, with fractions of an inch of space between the rig and walls/equipment during our drive and several overhead lines and objects. Keith was confident and his eyeball estimates and driving abilities were spot on. The property owner, who can be difficult to work with, loved Keith and his attitude. He made a tremendously tough job much less stressful, and he succeeded despite my estimate of us having < 30% chance of completing the scope. I’ve worked with Keith many times and never fail to appreciate his attitude and his professionalism, yet he outdid himself on this one.

I’ve always appreciated your support team but the drillers most of all. They’re the best in the business. I’ve drilled in 40 states and there’s no comparison.” – Jim Robert, Salem Engineering Group

“AECOM has had the pleasure of working with Gregg Drilling and their overwater drilling capabilities with the Quin Delta in the past, and most recently in the Summer of 2023. Their knowledge of the region, overwater drilling expertise, and incredible staff have been a tremendous asset to many projects that AECOM has worked with Gregg on in the Sacramento Delta Region.   Some of the geotechnical exploration work with “The Quin Delta”  has required difficult navigation into shallow waters, but the Gregg Over-water team has done a great job in working through these difficult challenges.  We look forward to working with Gregg and “The Quin Delta” when duty calls in the future.” – David Pieczynski, AECOM

“I wanted to let you know that it was a real pleasure working with Jarred, Clay, and Armando. They were honestly the best drilling crew I have worked with in a long time (probably ever) and certainly the best crew I have worked with at Gregg.

They were friendly, hard-working, and competent – willing and able to answer all my and [our client’s] questions. They kept to the schedule and most importantly did so safely, amidst the chaos of downtown and all the other hurdles we had to jump over.” – Carolina Zamora, Shannon & Wilson