Bay Area Vapor Intrusion Mitigation System Design

Terra-Petra Environmental Engineering is providing environmental engineering services for the design of the vapor intrusion mitigation system (VIMS) for a development of affordable Senior Housing in downtown San Rafael, CA. The development consists of the construction of a new six-story building. The building footprint is approximately 14,000 SF.

The site served as a Manufactured Gas Plant prior to the proposed improvements. Site assessment work was completed at the site prior to Terra-Petra’s involvement. A Human Heath Risk Assessment (HHRA) and a Site Conceptual Model (SCM) were carried out to determine the potential risk exposure posed to future construction workers, future commercial occupants and future residential occupants of the building based on VOC’s at the site. It was determined that the calculated risks for all potential receptors were less than the bench marks set forth for the property. The bench marks for this site were HI = 1 and ILCR = 1E-6. Results of the evaluation suggest that soil vapor intrusion mitigation systems may not be required to protect future occupants on this parcel.

The Department of Toxic Substances Control (DTSC) was engaged to serve as the lead regulatory agency at the site. Terra-Petra was directed to design a VIMS system in compliance with DTSC’s published guidelines, which we are in the process of completing.

It will be up to the DTSC to determine if the submitted VIMS design package meets DTSC guidelines and the soil vapor mitigation system provides for adequate human health assurance per the terms of the Land Use Covenant (LUC). If so, the DTSC can formally approve this project. Terra-Petra is confident that our VIMS design will satisfy the mitigation requirements as we have a vast amount of experience designing such systems that have been reviewed/approved by the DTSC.

Aside from the design work, Terra-Petra will be assisting our client in soliciting bids form qualified and experienced vapor intrusion contractors in the Bay Area. We will also be reviewing submittal packages and providing support throughout the Construction Administration Phase of the project. Our inspection crew is slatted to inspect and document the installation of the system using our state of the art field reporting system.

Vapor Intrusion Mitigation System Design & Installation – San Jose, CA

Terra-Petra Environmental Engineering is pleased to provide environmental engineering services for the design of the vapor intrusion mitigation system (VIMS) being proposed for a new affordable housing development in the Diridon Station Area in San Jose, CA.

The project consists of a multi-family residential building having 130 units with 5 stories above grade (no below grade elements). The lowest level will consist of parking with lobby, offices and a community room. The building footprint is approximately 23,400 SF on 1.02 acres.

The site where the proposed building is to be constructed did contain an Underground Storage Tank (UST) potentially containing PCE which was considered to be a Recognized Environmental Condition (REC). As such, soil vapor data was collected from the site during both wet and dry seasons approximately 9 months apart. The data showed that no on-Site sources of PCE have been identified at the Site. Further, no VOCs were detected at concentrations above residential DTSC-AF SLs for future buildings, and no further investigation, evaluation or consideration of exposures associated with VOCs in soil vapor is proposed. Additionally, no residential units were being proposed on the ground floor of the new development. However, the regulatory oversight agency for this site is still requiring that passive Vapor Intrusion Mitigation System (VIMS) be designed and installed at this building.

Terra-Petra was engaged to design a pragmatic code compliant VIMS system that would take into consideration the lack of site-specific risk. As such, we were able to design a creative membrane system that limited the more protective mitigation measures to areas of higher residential occupancy/risk of exposure. These areas included the community room and elevator lobby. While areas of lower risk such as the trash enclosure rooms and parking garage we were able to design a system that would be protective of VI, but also reduce overall cost impacts on the project’s budget.

Terra-Petra will also be providing Construction Administration services and Construction Quality Assurance/Quality Control Services.

Terra-Petra is Proudly Recognized as an SBE – Small Business Enterprise

Terra-Petra is Proudly Recognized as an SBE – Small Business Enterprise

The SBE is a company-level diversity certification. Non-industry specific it is issued by a local or state government. Terra-Petra’s SBE certification is issued by the State of California.

Eligibility for certification as a Small Business Enterprise varies depending on the issuer. Requirements include the number of employees, the length of time the company has been in business and the net worth of the company’s owner.

In order for a small business to be eligible for certification, the small business must meet the following requirements in California:

  • Be independently owned and operated
  • Not dominant in the field of operation
  • The principal office must be located in California
  • Owners (officers, if a corporation) domiciled in California
  • A business with 100 or fewer employees; an average annual gross receipt of $15 million or less, over the last three tax years.
    • A small business will automatically be designated as a microbusiness, if gross annual receipts are less than $3,500,000; or the small business is a manufacturer with 25 or fewer employees.

Upon meeting the Small Business Certification eligibility requirements, certified small business (SBs) and microbusinesses (MBs) are entitled to the following benefits:

  • A five percent (5%) bid preference on applicable State solicitations.
  • Certified small business/microbusinesses are eligible for the State’s Small Business Participation Program. This program sets a goal for the use of small businesses in at least 25% of the State’s overall annual contract dollars.
  • Under the Prompt Payment Act, the State must pay a certified SB / MB higher interest penalty for late payment of an undisputed invoice. Prompt payment penalties for construction firms are addressed separately under Public Contract Code, Section 10261.5.
  • State agencies may use a streamlined process, known as the SB/DVBE Option, by contracting directly with a California certified small business/microbusiness for goods, services, information technology and Public Works projects. The solicitation must be valued at more than $5,000 and the State agency must obtain price quotes from at least two California certified small business/microbusiness.
  • The DGS-PD charges state and local agencies an administrative fee, when contracting with a California Multiple Award Schedules (CMAS) vendor. As an incentive, the fee is waived, if the CMAS vendor is a certified small business/microbusiness.

Terra-Petra maintains a working knowledge of numerous environmental and soil gas mitigation matters. Our staff includes Methane Consultants, Radon Mitigation Engineers, Construction Managers, Civil Engineers, Registered Environmental Assessors, Registered Geologist/Certified Engineering Geologist, Petroleum Geologists and Petroleum Engineers. This experience gives Terra-Petra the ability to find compromise solutions for any environmental concern that may arise.

Terra-Petra offers on-call consulting services in the City of Los Angeles. We are available to do the work or make official visits at any time as needed.

Contact us today at 1.888.540.5703 or info@terra-petra.com.

Terra-Petra Recognized as Small Business Enterprise in CA

The Small Business Enterprise or SBE is a company-level diversity certification. Non-industry specific, it is issued by a local or state government. Terra-Petra’s SBE certification is issued by the State of California.

Eligibility for certification as a Small Business Enterprise varies depending on the issuer. Requirements include the number of employees, the length of time the company has been in business, and the net worth of the company’s owner.

In order for a small business to be eligible for certification, the small business must meet the following requirements in California:

  • Be independently owned and operated
  • Not dominant in the field of operation
  • The principal office must be located in California
  • Owners (officers, if a corporation) domiciled in California
  • A business with 100 or fewer employees; an average annual gross receipt of $15 million or less, over the last three tax years.
    • A small business will automatically be designated as a microbusiness if gross annual receipts are less than $3,500,000, or the small business is a manufacturer with 25 or fewer employees.

Upon meeting the Small Business Certification eligibility requirements, certified small business (SBs) and microbusinesses (MBs) are entitled to the following benefits:

  • A five percent (5%) bid preference on applicable State solicitations.
  • Certified small business/microbusinesses are eligible for the State’s Small Business Participation Program. This program sets a goal for the use of small businesses in at least 25% of the State’s overall annual contract dollars.
  • Under the Prompt Payment Act, the State must pay a certified SB / MB higher interest penalty for late payment of an undisputed invoice. Prompt payment penalties for construction firms are addressed separately under Public Contract Code, Section 10261.5.
  • State agencies may use a streamlined process, known as the SB/DVBE Option, by contracting directly with a California-certified small business/microbusiness for goods, services, information technology, and Public Works projects. The solicitation must be valued at more than $5,000 and the State agency must obtain price quotes from at least two California-certified small business/microbusiness.
  • The DGS-PD charges state and local agencies an administrative fee when contracting with a California Multiple Award Schedules (CMAS) vendor. As an incentive, the fee is waived, if the CMAS vendor is a certified small business/microbusiness.

Terra-Petra has been in the environmental engineering industry for over 20 years, with many successful projects to lean on. The company started its operations focusing on the Los Angeles market to address the local “methane concerns” which quickly became a big issue. Our in-house experts were a big part of the team that developed the local Los Angeles Methane Code.

Terra-Petra continues to maintain a working knowledge of numerous environmental and soil gas mitigation matters. Our staff now also includes Methane Consultants, Radon Mitigation Engineers, Construction Managers, Civil Engineers, Registered Environmental Assessors, Registered Geologist/Certified Engineering Geologist, Petroleum Geologists, and Petroleum Engineers. This experience gives Terra-Petra the ability to find compromise solutions for any environmental concern that may arise.

In order to meet client demands, Terra-Petra took the position of being an industry leader by developing creative solutions to fit the variety of conditions the states they serve are faced with. Developing innovative solutions meant working with key suppliers, and contractors, as well as leveraging relationships within the respective agency involved. Terra-Petra’s innovative solutions have included the introduction of new materials into the market, as well as new system installation methods.

The Terra-Petra team enters every project with a “safety first” mindset and philosophy. Having undergone extensive safety training programs to include the 40-hour Hazardous Waste Emergency Operations and Emergency Response (HAZWOPER) training, we are proud to say that we work with zero injuries in the field.

Terra-Petra’s Management Philosophy approach is very simple: “Make every client’s life easier.”

Terra-Petra offers on-call consulting services in the City of Los Angeles and throughout California. We are available to do the work or make official visits at any time as needed.

Contact us today to arrange for a time to meet with our management team: 1.888.540.5703 or info@terra-petra.com.

The Davis-Bacon Act

The Davis–Bacon Act of 1931 is a United States federal law that establishes the requirement for paying the local prevailing wages on public works projects for laborers and mechanics. It applies to contractors and subcontractors performing on federally funded or assisted contracts in excess of $2,000 for the construction, alteration, or repair (including painting and decorating) of public buildings or public works.

The Davis–Bacon Act is part of the United States Code, codified as 40 U.S.C. 3141-3148.

The Act covers four main areas of construction: residential, heavy, buildings, and highway. Within these areas are further classifications, including craft positions such as plumber, carpenter, cement mason/concrete finisher, electrician, insulator, laborer, lather, painter, power equipment operator, roofer, sheet metal worker, truck driver, and welder.


Terra-Petra performs prevailing wage inspections under the following classification:

Craft: Building/Construction Inspector & Field Soils & Material Tester

Vapor Intrusion Mitigation System Design And Installation – Santa Fe Springs, CA

Terra-Petra’s Environmental Engineering Division has partnered with a Los Angeles REOC and investment management firm to design a comprehensive Vapor Intrusion Mitigation System (VIMS).

The new development, located in Santa Fe Springs, CA, will consist of a tilt-up industrial warehouse building, on grade, with an approximate building footprint of 150,500 SF. The gas vapor mitigation system shall be designed in accordance with a site specific Phase II Environmental Site Assessment report, and in accordance with the Vapor Intrusion Mitigation Advisory published by the C.A. EPA Department of Toxic Substances Control (DTSC) dated October 2011 (Cal/EPA 2011a, 2011b).

Terra-Petra Providing Waterproofing Services For New High-End Project in West Hollywood

Terra-Petra is thrilled to have been a part of this fabulous project being finished off in West Hollywood, The Pendry Hotel. Terra-Petra served as the Quality Assurance/Quality Control Waterproofing Inspectors throughout the entire construction process. We are also in the process of completing the QA/QC Fenestration Testing at the Residence in compliance with the project’s performance specifications.

Our field-testing crew has been ramping up over the last week to ensure we have the necessary labor and material to meet the demand of the water testing schedule. We are currently in production mode as we are testing the exterior fenestrations of the building with 3 crews working simultaneously.

Re-Post From Vogue.com

The Britely, a New Member’s Club in Los Angeles, Is Feather-Filled and Fabulous

There’s this famous Oscar Wilde quote: “Everything in moderation, including moderation.” That very well could be plastered on the gilded door of The Britely, a new member’s only club in Los Angeles where maximalism is the modus operandi. There’s not one, but two Wolfgang Puck restaurants—one of which is painted a flamingo pink. Their rooftop bar, with sweeping views of L.A.’s urban sprawl, is adorned in jade palmeral-tiger print. Then there’s the hangout de resistance: an underground lounge with turquoise banquettes, gold lamé pillows, Hollywood Regency feather lamps, and a bowling alley. Simply put: it’s a place where you can have some serious fun. (Or as Estelle Lacroix, The Britely’s managing director puts it, “a little self-indulgence.”)

READ FULL ARTICLE

Re-Post from LA.Eater.com

First Look Inside Wolfgang Puck’s Pair of New Restaurants at Pendry West Hollywood

Wolfgang Puck is making a pizza. The 71-year-old chef, who has become a household name from his airport eateries, grocery line, and upscale establishments, has been making pizza for a very long time. Best known for creating the smoked salmon pizza at Spago, which was one of the city’s first restaurants to have a wood-fired oven, Puck is contemplating the signature pizza at his new daytime hotel cafe Ospero.

He stretches the dough while posing for the camera, as if this was a shoot for a glossy fashion magazine. Puck is always posing, holding a dish out for maximum exposure. He, and the team at Ospero and the penthouse restaurant Merois, will likely need it as the ongoing pandemic continues to hamper an ideal opening scenario at the massive new Pendry West Hollywood.

READ FULL ARTICLE

artworxLA Terra-Petra

Terra-Petra at artworxLA Virtual Wine Tasting

Terra-Petra’s VP/General Manager, Justin Conaway, and his wife Robin represented Terra-Petra at artworxLA’s inaugural Virtual Wine Tasting Mixer on March 17, 2021. Despite physical distancing, the attendees were happy to know that we can all still connect by sharing a delicious glass of wine while learning about the wine-making process and show support for the artworxLA’s programming.

artworxLA Board Member Grant and his wife Shaya Kirkpatrick graciously hosted this event by donating wines from their boutique vineyard, William Robert Estate Wines, located in Paso Robles, CA. Justin and Robin are now getting ready for their next road trip to Paso Robles thanks to the recommendations from Shaya and Grant Kirkpatrick!

artworxLA’s next virtual event, Gala 29  will take place May 8th- 14th.

Many thanks to Meghan Beckmann of KAA Design for the invitation.

Soil Management Plan Implementation – Richmond Oil Field

Terra-Petra recently mobilized to a development within the Richmond Oil Field in Yorba Linda, CA after the grading contractor working on the site encountered what they described as “black colored material”. Soil that carries these characteristics is suspected of being impacted by petroleum-contamination, pesticide impact or other hazardous materials and needs to be tested by a laboratory to verify the actual presence of contaminants and at what concentrations.

In this particular case, Terra-Petra elected to run the following tests on the soil samples we collected from the site under a strict chain of custody protocol.

  • EPA 8260B by 5035 – Volatile Organics by GC/MS + Oxygenates/Gasoline Range Organics
  • EPA 6010B by 3050 – Title 22 CAM 17 Trace Metals by ICP-OES
  • EPA 7471A – Mercury by Cold Vapor Atomic Absorption
  • EPA 9045C – pH
  • EPA 8270C-SIMS Polynuclear Aromatic Hydrocarbons

With the laboratory results Terra-Petra was able to conduct a site assessment to delineate the potentially impacted area, which was approximately 90’-180’ .  The Soil sampling was implemented in accordance with the site-specific Soil Management Plan (SMP), which is essential for any development where impacted soils may be encountered. Within an SMP should be a section describing the specific response/remedial actions that will need to be carried out for any impacted soils.

Numerous agencies can become involved with remedial actions for projects in Orange County in particular. For example, the Orange County Health Care Agency (OCHCA) and Orange County Fire Authority as well as the local planning department will be notified and involved in such matters. Additionally, the Regional Water Quality Control Board, the California Department of Conservation, Geologic Energy Management Division (CalGEM) and South Coast Air Quality Management District may become involved until a no further action status is attained.

In the coming days and weeks Terra-Petra will be drafting and submitting a Work Plan to carry out the remedial activities under the oversight of the local agencies involved.

Vapor Intrusion Mitigation System – Palo Alto, CA

Terra-Petra’s Environmental Engineering Division has partnered with a significant environmental consulting firm in the Bay Area to prepare a comprehensive Vapor Intrusion Mitigation System (VIMS) for a new development located in Palo Alto, CA.

Terra-Petra designed the passive mitigation system with the ability to convert it to an active system in the future if deemed necessary. The VIMS System was reviewed and approved by the Department of Toxic Substances Control (DTSC).

Having completed the VIMS design we have moved on to the construction administration phase which includes submittal review and RFI responses, as well as the QA/QC inspections. We are currently on-site overseeing the smoke testing of the subslab membrane system.

For more on this project visit the City of Palo Alto Website

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