Ismael Carbajal to the position of Principal/Director of the Waterproofing Division

Terra-Petra Announces Promotion of Ismael Carbajal to Principal/Director of Waterproofing Division

Ismael Carbajal to the position of Principal/Director of the Waterproofing DivisionLos Angeles, CA – June 7, 2024 – Terra-Petra, a leader in environmental engineering and construction services, is happy to announce the promotion of Ismael Carbajal to the position of Principal/Director of the Waterproofing Division.

This significant milestone marks the first appointment of a Director in the 10-year history of the Waterproofing Division.

In his new role, Ismael will continue to provide exceptional technical consulting on all waterproofing projects for Terra-Petra clients. Additionally, he will take on the responsibility of providing strategic direction for the division, guiding it toward our ambitious goal of becoming a world-class waterproofing consulting firm.

We are incredibly excited about Ismael’s promotion and the positive impact it will have on our company and clients. His dedication, expertise, and vision have been instrumental in the success of our waterproofing projects, and we are confident that he will excel in his new leadership role.

Ismael Escobedo Carbajal’s promotion represents a crucial step in our long-term strategy to expand and enhance the capabilities of Terra-Petra’s Waterproofing Division. Under his guidance, we look forward to achieving new heights in quality, innovation, and client satisfaction.

Please join us in congratulating Ismael on his well-deserved promotion. We are excited about the future and look forward to seeing the division flourish under his leadership.

Design Build Of Oil Well Vent Cone

Design Build Of Oil Well Vent Cone - Torrance, CA

Terra-Petra was engaged to complete a Design Build of an Oil Well Vent Cone currently being completed in the City of Torrance, CA.  Oil well vent cones are designed to accumulate potentially hazardous and explosive oil field gasses that travel through oil well casings to the earth’s surface, and vent them to an approved location out of harm’s way.

Terra-Petra designed the vent cone system for the client, and negotiated with the City of Torrance, as well as their third-party peer review consultant, on the design of the Vent Cone in order to obtain the necessary permits needed to install the system.

Upon receiving design approval Terra-Petra engineers mobilized to the site and are in the process of completing the installation.

Project Services Provided

During the course of the design build for this oil well vent cone, Terra-Petra provided the following services for our client:

  • Excavated the oil well, and placed the cone over the casing
  • Filled the cone with gravel and provided all plumbing to a vertical vent riser terminating at the roof of the adjacent building.
  • We will also be installing a monitoring port on the vent cone riser pipe to allow for quarterly monitoring of the vent cone to ensure that it is no leaking methane or H2S.
  • As part of our services Terra-Petra will be carrying out the ongoing monitoring and reporting services for the client.

Terra-Petra Oil Well Vent Cone Services

Terra-Petra is the authorized distributor of a patented, pre-cast concrete oil well vent cone which is lined with an impermeable methane gas barrier. We have overseen the successful installation of more than 200 of these vent cones. We can coordinate the delivery and installation of a vent cone. We also are able to certify the installation to the governing agency.

If you have a need for an oil well vent cone system, or other oil well or environmental engineering services, contact Terra-Petra today for a consultation.

Project Photo Gallery

Click on any image below to enlarge.

What Does A Phase I ESA Include?

What Does A Phase I ESA Include?

When you hire Terra-Petra to perform a Phase I ESA (Environmental Site Assessment) the meticulous process conducted by our expert environmental consultants typically includes the following:

Historical Site Research

A thorough investigation of historical records, aerial photographs, and land-use records to identify past activities that could have led to contamination.

Site Inspection

A comprehensive on-site evaluation to identify potential sources of contamination, including above-ground and underground storage tanks, hazardous substances, and other environmental risks.

Interviews And Documentation Review

Discussions with current and past property owners, occupants, and local officials to gather valuable information about the site’s history and potential environmental concerns.

Report And Recommendations

A detailed report summarizing findings, identifying recognized environmental conditions (RECs), and providing recommendations for further action, if necessary.

Contact Terra-Petra Today To Get Started

Terra-Petra is committed to delivering thorough, timely, and accurate assessments to empower our clients with the knowledge needed for informed decision-making.

Contact us today to discuss your project and discover how our Phase I ESA services can add value to your environmental due diligence efforts.

Terra-Petra Expands To Southwest With New Office In Phoenix Arizona

We are pleased to announce that Terra-Petra Environmental Engineering has opened a new office in Phoenix, Arizona – a significant milestone in our company’s growth.

The expansion will enable Terra-Petra to provide highly-specialized environmental engineering, waterproofing, and inspection services throughout the Southwest region.

Headed by Dan Valdez, Director of Field Operations, Terra-Petra will start its mobilization in the State of Arizona, Southern Nevada and New Mexico.

Terra-Petra’s consulting services include, but are not limited to, the following:

Environmental Division

Methane Mitigation

Vapor Intrusion Mitigation

Radon Mitigation

Phase I Environmental Site Assessment (ESA)

PHASE II Environmental Site Assessment (ESA)

Underground Storage Tanks

Oil Well

Waterproofing Division

Building Envelope Consulting

Forensic Waterproofing Consulting

Inspection Services

QA/QC Mitigation System Observation & Testing

QA/QC Waterproofing Building Envelope Observations

Electronic Leak Detection

Terra-Petra’s expansion represents a commitment to serving a greater need for more comprehensive environmental engineering services in the Southwest. We are optimistic about the new opportunities the Phoenix location offers and look forward to building strong relationships with clients in the area.

Terra-Petra Founder Hugh Avery – The Godfather Of Methane

Terra-Petra Founder Hugh Avery – ``The Godfather Of Methane``

Enjoy another amazing sketch by Terra-Petra Vice President Justin Conaway this time of Terra-Petra’s own Hugh Avery.

Hugh Avery is the Founder of Terra-Petra, and now acts as Senior Consultant. He was the first methane gas inspector in Los Angeles and he is recognized for his extensive experience and knowledge of methane mitigation, regulation, permitting, construction design, and inspection.

Hugh found his passion for his work while learning the science and engineering behind the behavior of methane gas, and he entered the field at the very beginning, when the regulations and codes on gas mitigation were being written.

Read more about Hugh

To see more of Justin’s sketches, you can visit and follow his Instagram page @justinconawaysketches

Terra-Petra Completed Successful Oil Well Leak Test

Terra-Petra Completed Successful Oil Well Leak Test

Terra-Petra completed another successful oil well leak test, this time in Placentia, CA.

We were on-site to direct the excavation contractor in an effort to locate two buried oil wells on a property scheduled for a commercial redevelopment.

Once uncovered, Terra-Petra completed in oil well leak testing activities accordance with State of California Department of Conservation, Geologic Energy Management Division (CalGEM) guidelines and the Placentia Fire & Life Safety’s Combustible Soil Gas Hazard Mitigation Guideline. The top of thw well casings were located at 11.5’ below surface grade.

Photos Of Oil Leak Test

Click any image to enlarge

Results of the emissions monitoring at the top of both well casings showed combustible gas at non-detectable concentrations (less than 1 ppmv), and background air concentration of combustible gas away from the well casings was measured at 0.1 to 0.2 ppmv.

Results of the monitoring at the top of the well casings showed non-detectable concentrations of hydrogen sulfide. Results of the bubble leak-testing activity showed no dynamic bubble formation and therefore no indication of gas pressure leakage from the top of the well casing.

All work was performed under the supervision of a CalGEM representative.

Subslab Depressurization System (SSD) Installation

Subslab Depressurization System (SSD) Installation

Terra-Petra was engaged by the attorney representing the owner of a former dry cleaner in southern California that was experiencing vapor intrusion.

Specifically, indoor ambient air was monitored and determined to have concentrations exceeding commercial screening levels for the following (as well as others):

  • Toluene
  • Tetrachloroethene
  • Dichlorodifluoromethane (CFC 12)

The attorney had requested a way to mitigate the vapor intrusion issues at the site so that the property could be commercially viable again.  As we always do with any existing building Terra-Petra completed an extensive investigation of the building of concern to gain an understanding of what type of Subslab Depressurization System (SSD) would be most effective in mitigating the issue. Terra-Petra completed the pressure field extension testing to determine how much vacuum would be required to extend a minimum sub-slab negative pressure field of -0.016 ” w.c. Understanding how much vacuum is required and where it should be applied is the objective of the permeability mapping portion of any investigation and shall serve as the foundation for our design.

The design of the mitigation plan is the most critical component in the entire process because it determines the remedial design and scope of work. This is the part that eliminates the ad hoc guess work and provides a defined plan. It also eliminates installing a system that is not effective in reducing soil borne contaminants. Additionally, the process eliminates the possibility of overdesigning the system to compensate for uncertainties. Over-designed systems result in excessive installation and operational costs. Once a plan is in place, definite implementation costs can be determined.

As such, Terra-Petra completed the design, which we permitted through the local building department and began installing the system in early February of this year. The system will be online before the end of this month after we complete the installation and run our start up testing.

Installation Progress Photos

Need Vapor Intrusion Mitigation? Contact Terra-Petra Today For Assistance

Feel free to contact Terra-Petra for any of your vapor intrusion mitigation needs.  One of our experienced and friendly team members is standing by to assist you.

A Tribute To John Conaway

A Tribute To John Conaway - Terra-Petra's Original Engineer

As a tribute to John Conaway, Terra-Petra’s original engineer, his son and Terra-Petra Vice President Justin Conaway drew this beautiful sketch seen here.  We’re proud to pay tribute to John’s legacy and his integral contributions to the success of our company.

To see more of Justin’s sketches, you can visit and follow his Instagram page @justinconawaysketches

Terra-Petra Receives 2023 Los Angeles Award For Environmental Engineering

Terra-Petra Receives 2023 Los Angeles Award For Environmental Engineering

LOS ANGELES December 5, 2023 — Terra-Petra Environmental Engineering has been selected for the 2023 Los Angeles Award in the Environmental Engineering category by the Los Angeles Award Program.  This is the 11th year in a row that Terra-Petra has received this honor.

Each year, the Los Angeles Award Program identifies companies that we believe have achieved exceptional marketing success in their local community and business category. These are local companies that enhance the positive image of small business through service to their customers and our community. These exceptional companies help make the Los Angeles area a great place to live, work and play.

Various sources of information were gathered and analyzed to choose the winners in each category. The 2023 Los Angeles Award Program focuses on quality, not quantity. Winners are determined based on the information gathered both internally by the Los Angeles Award Program and data provided by third parties.

About Los Angeles Award Program

The Los Angeles Award Program is an annual awards program honoring the achievements and accomplishments of local businesses throughout the Los Angeles area. Recognition is given to those companies that have shown the ability to use their best practices and implemented programs to generate competitive advantages and long-term value.

The Los Angeles Award Program was established to recognize the best of local businesses in our community. Our organization works exclusively with local business owners, trade groups, professional associations and other business advertising and marketing groups. Our mission is to recognize the small business community’s contributions to the U.S. economy.

SOURCE: Los Angeles Award Program

Terra-Petra’s Justin Conaway Interviewed On Brownfield Braintrust Podcast with Matt Winefield

Terra-Petra's Justin Conaway Interviewed On Brownfield Braintrust Podcast with Matt Winefield

Terra-Petra Vice President and General Manager Justin Conaway was recently interviewed on the popular Brownfield Braintrust Podcast with Matt Winefield of Winefield & Associates.  On the podcast episode Justin and Matt discuss Vapor Intrusion Mitigation Systems (VIMS) and the state of the current environmental engineering industry and vapor intrusion.  Read more below, and watch/listen to the podcast.

In the current Brownfield Braintrust Podcast, Matt Winefield of Winefield & Associates, Inc. sheds light on Vapor Intrusion Mitigation Systems (VIMS) with the help of Justin Conaway, Vice President and General Manager of Terra-Petra Environmental Engineering. Given evolving soil vapor mitigation standards, VIMS are currently much more prevalent than just three years ago. It is unlikely one can acquire, for example, a former dry cleaner site (with PCE releases), run a vapor extraction system, and then pour your foundation. The lead agency will likely specify a VIMS that operates for the life of the new building. Justin explains the three most common VIMS technologies now utilized.

Listen to the audio only version of this podcast.

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