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Confidential Aerospace Client · Western U.S.

Haley & Aldrich leads negotiations for aerospace company, resulting in better stormwater permit terms as site progresses toward closure

Client challenge

A major aerospace company manages a large property that was formerly used for testing of rocket engines for over 40 years. Because the site has an individual NPDES stormwater permit with strict effluent limits, the company has implemented one of the largest and most complex industrial stormwater treatment, monitoring, and reporting programs in the U.S. to manage their runoff and maintain permit compliance. The company needed a stormwater management consultant with comprehensive expertise, who could oversee the entire program and be their trusted partner.

Our approach

The company turned to Haley & Aldrich to provide complete management of stormwater operations and permit compliance, year-round — while also implementing programs to remediate and reduce its stormwater footprint.

The services we provide range from overseeing the operation and maintenance of treatment systems and best management practice (BMP) technologies, to monitoring, data analysis and modelling, reporting, permit renewals, plan updates, training, flow modeling reviews, Reasonable Potential Analysis, LEAN program improvements, and community outreach. We also advocate for our client — who is fully invested in remediating the site — supporting their end goals of closing the permit and returning the site to open space.

Value delivered

  • Reduced exposure to stormwater compliance penalties
  • Optimized operational oversight of a massive stormwater treatment system
  • Brought client closer to site-closure goals
  • Improved public perception of site
  • Turned NPDES site into a sustainable natural open space and wildlife corridor

Taking stormwater compliance to a whole new level

Big problems require big solutions

From the early 1950s a major aerospace manufacturer conducted rocket engine testing at a large site, which spans approximately 3,000 acres (5 square miles). The nature of the legacy activities and site impacts led regulators to issue a site-specific stormwater National Pollutant Discharge Elimination System (NPDES) permit that has driven one of the most ambitious industrial stormwater management and treatment programs in the United States.

The site is located at the headwaters of multiple watersheds such that stormwater historically drained in different directions through multiple outfalls. The NPDES permit for this site includes stringent effluent limitations for a variety of constituents, which vary by outfall. As a condition of the permit, the facility is required to sample flows from every outfall, for every storm event.

Outfalls are equipped with programmable ISCO auto samplers and flow meters, which enable collection of flow-weighted composite stormwater samples. The site also has a weather station and several rain gauges to record differences in rainfall across the large area of the site. Runoff from most of the outfalls is diverted through a series of pumps and conveyance structures that move the water toward the center of the site where it is stored in ponds and storage tanks pending treatment, prior to offsite discharge.

There are two sophisticated engineered stormwater treatment systems onsite that may be operated to treat the runoff using an ACTIFLO system and associated chemical and physical treatment processes (e.g., flocculation, coagulation, sand filters). In addition the site also has flow-through media filters, an advanced — and in fact, award winning — biofilter, a bioswale, culvert modifications, and extensive site-wide erosion and sediment controls.   

Compliance takes more than technology

But while an extraordinary technology foundation is essential to enabling compliance, actually achieving it comes down to human performance. And to reliably execute the compliance program, the client needed a partner with stormwater management capabilities that were exceptionally broad and deep. 

Haley & Aldrich was chosen to manage the property’s stormwater compliance program at the site on a year-round basis, including overseeing stormwater, sediment, and receiving water quality monitoring;  bioassessment monitoring; best management practices (BMP) inspections and maintenance; data analysis and management; quarterly and annual reporting; Stormwater Pollution Prevention Plan (SWPPP) preparation and training, Quality Assurance Project Plan (QAPP), and Sampling and Analysis Plan (SAP) updating; NPDES permit renewal support; flow modeling support and review; Reasonable Potential Analysis; community outreach support; and general stormwater training.

Haley & Aldrich is also responsible for overseeing the operation and maintenance of the stormwater treatment systems, including optimizing real-time chemical dosing rates during storm operation. We also oversee the inspection, operation and maintenance of all BMPs, and manage the Construction Stormwater General Permits required for construction of new BMPs, and demolition of buildings and other facilities.

On the path to closure

The long-term objective for this site is to eventually terminate the individual NPDES stormwater permit, as the site is undergoing extensive demolition and restoration activities aimed at turning the site back into natural, open space that will serve as a park and wildlife corridor. While working toward that goal, the owner has received significant value thanks to engaging Haley & Aldrich on the project. The client has peace of mind: the property has been managed to full compliance, and liability for exceedances has been reduced. Because of its vast size and complexity, the manpower cost of operating the system is huge. Haley & Aldrich’s expertise in efficient operations continues to generate significant operating cost savings through optimizing system operation, without compromising system performance. 

For more information on this project, contact:

Nancy Gardiner

Senior Associate

Joe Weidmann

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