About Bret Gallo

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So far Bret Gallo has created 22 blog entries.


As of April 20, 2020, the Bison Engineering, Inc., Helena office will be located at 3143 E. Lyndale Ave., Helena, MT 59601 Our phone number, 406-442-5768, will remain the same. Please make note of our new address and stop by to see our new offices when you’re in the neighborhood!

WE’RE MOVING!2020-04-22T13:07:22-06:00


It’s been almost two months since EPA issued its Information Collection Request (ICR) to facilities subject to the Plywood and Composite Wood Products (PCWP) MACT standard. Responses are due at the beginning of next February. Bison is helping prepare responses for several affected clients with facilities in Montana, Oregon, Washington, and Idaho. In particular, we are working with these Northwest clients to ensure we use industry-standard emissions factors that produce consistent, defensible and realistic estimates of hazardous air pollutant (HAP) emissions from kilns and other emissions sources. Please contact us if you have questions about responding to the ICR for

PCWP MACT ICR Reminder2018-08-21T14:41:04-06:00

They’re Here…Oregon Air Toxics Proposed Rules

Just in time for Halloween, Oregon DEQ has published their proposed rules to establish an entirely new permitting program designed to limit air emissions of 255 toxic chemicals and classes of toxic chemicals. The rule will apply to all facilities that are currently required to obtain an Air Quality Discharge Permit or Title V Operating Permit and to any facility DEQ determines could potentially emit non-de minimis amounts of toxic air pollutants.

They’re Here…Oregon Air Toxics Proposed Rules2018-08-21T14:41:04-06:00

Bison at MT Tech Career Fair

Thanks to all the students who visited us at the fall Montana Tech Career Fair. We're always looking for great engineers, scientists, and technicians to join what, in our humble opinion, is a pretty great company (partly because it includes a significant number of Orediggers!).

Bison at MT Tech Career Fair2017-09-14T15:26:37-06:00

Discussion Draft Cleaner Air Oregon Rules Overview

See this post for our brief overview of the recently released discussion draft of the Cleaner Air Oregon air toxics health-based rules. The advisory committee has been asked to review and submit comments by September 9. Then Oregon DEQ will update the discussion draft and issue a formal draft for a 60-day public review period starting mid-October.

Discussion Draft Cleaner Air Oregon Rules Overview2017-09-01T15:08:22-06:00

Diane Lorenzen, P.E.Senior Project Engineer

Diane is a licensed professional engineer with a B.S. in Civil Engineering from Stanford University and an M.S. in Environmental Engineering from Montana Tech. She started her air quality consulting career at Bison Engineering in 1991. From 1996 through 2016, she worked as an independent air quality consultant while focusing on raising her family. Diane also worked at Montana DEQ for two years as an air quality modeling specialist. Diane rejoined Bison Engineering in 2016. Diane has a great deal of experience in air quality permitting and compliance support for wood products clients in Idaho, Washington, Oregon

Diane Lorenzen, P.E.Senior Project Engineer2019-01-11T13:56:49-07:00

First Look at EPA Budget Cuts

The EPA's acting Chief Financial Officer published this internal memo March 21st providing a first look at detailed budget cuts and program eliminations being considered within the agency. The memo identifies a 31 percent decrease from the 2017 FY budget, but the Washington Post points out that, because EPA's water infrastructure program will be increased, budget cuts to the rest of the agency amount to approximately 43 percent.

First Look at EPA Budget Cuts2017-04-03T10:57:23-06:00

Cleaner Air Oregon Framework Presentation

Just presented this morning at the Mass Timber 2017 Conference in Portland, Oregon. The presentation outlines and provides additional information on the recently released draft framework for Oregon's in-work, risk-based air toxics rule; click here to see a copy of the presentation. The Cleaner Air Oregon Advisory Committee will be reviewing and discussing the framework in a public meeting next Tuesday, 4/4, in Springfield. I plan to attend and will provide another update. Stay tuned! Kevin Mathews p.s. Before attending this conference, I didn't know much about mass timber (someone told me it's short for "massive" timber). The industry has done

Cleaner Air Oregon Framework Presentation2017-04-03T12:22:42-06:00

Cleaner Air Oregon Draft Framework Released

As promised, Oregon DEQ and the Oregon Health Authority have released a draft framework for the new set of air toxics rules they have been developing. Check out this announcement on the Cleaner Air Oregon website. Here's a copy of the draft framework. The agencies will be meeting with the CAO Advisory Committee Tuesday, April 4th in Springfield to discuss the proposal and take public comments.

Cleaner Air Oregon Draft Framework Released2017-04-03T12:23:40-06:00
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