Project Successes


Engineering design of a 20 MGD ballasted flocculation clarification expansion for a non-potable water supply system. 



Assisted a corporate client standardize environmental compliance approaches for all their Texas facilities.  Educated facility and corporate representatives on environmental requirements and participated in brainstorming best management practices for them to apply state-wide at their sites. 



GBMc & Associates is providing ongoing technical and regulatory support for various clients in the implementation of EPA's most recent version of Boiler MACT.  Current support includes developing site tailored compliance documents cataloging all Boiler MACT compliance requirements (testing, reporting, recordkeeping) for the January 2016 compliance date. 



Two GBMc & Associates nine-element watershed management plans were approved by EPA Region 6 in 2015.  GBMc successfully completed two watershed management plans in 2014 in collaboration with the City of Fort Smith Arkansas.  One plan was for Frog Bayou in Arkansas and the other for Lee Creek in Arkansas and Oklahoma.  These plans were approved by EPA in mid-2015.  According to the EPA these management plans include ".... a good holistic characterization of the watershed and the water quality issues that identifies potential threats and locations in need of prevention/restoration practices."  "This proactive approach puts this WMP in the unofficial category of a "Protective Watershed Based Plan" which EPA Region 6 and even national EPA are eager to see more examples of from our states."



Performed an Antidegradation Alternatives Analysis supporting a $1.8 billion expansion at a fertilizer manufacturing facility.  The analysis included engineering estimates of capital/operating costs for non-degrading and less degrading management options for wastewater treatment.



Provided air permitting support to obtain a Prevention of Significant Deterioration Construction Permit and Title V Air Operating Permit for a corporation that is new to the State of Arkansas.  Through facilitating communication and efforts between the company and the regulatory agency, the air permit was obtained within the aggressive timeframe required by the company. 



Engineering design and project management for construction of no-potable and potable water pipelines to support a $700 million industrial expansion. Included improvements to a booster station for the non-potable water supply. 



Performed an engineering alternatives analysis to determine technologies and costs to reduce total nitrogen and total phosphorus in petroleum refinery effluent by 90%.  Included a hydrological assessment of storm water inputs and improvements to eliminate storm-related treatment system upsets.



Engineering design and construction support for a first-flush storm water capture system at a chemical manufacturing facility to resolve NPDES concerns.  Included collection basin, controls, pumps and force main pipeline to a holding reservoir.



Designed and received state agency approval for an alternative thermal NPDES permitting strategy using CORMIX modeling for two electric power generators in EPA Region 7.  Two steam electric power generation facilities had received draft thermal permit limits which neither could reliably meet.  Through application of mixing zone modeling following state water quality standards nuances GBMc was able to design a permitting approach resulting in limits that the state regulatory agency, and EPA Region 7, approved and with which client was able to remain compliant.



Completed construction of over 4,000 feet of stream mitigation to compensate for stream impacts related to a development in Central Arkansas.  The project required the relocation of approximately 2,000 feet of stream channel and the restoration of approximately 2,000 additional feet of small intermittent channel.  All facets of the stream mitigation project were designed using natural channel design techniques (Rosgen, 1996).  The riffle pool complex streams were designed to include cross veins, engineered riffles, root wad revetments and bioengineered bank stabilization.  The new channel was competed in 2013 and has proved stable through its first bankfull flow event.



Provided regulatory support for remediation of a former zinc smelter site through the Brownfields program.  Reviewed remedial options and prepared the Property Development Plan plus conducted confirmation sampling of remediated areas.  Prepared the Engineer's certification of corrective actions supporting a request for no further action from the regulatory agency.



Designed and obtained regulatory approval for a multi-user pipeline to convey treated wastewater from three industries and one municipality to a larger receiving stream with more favorable effluent limits, thus avoiding an estimated $150 million in advanced treatment construction costs.



Successfully forced formal withdrawal of a final approved EPA TMDL in 2012.  EPA and its contractor completed a TMDL for minerals on Bayou de L'Outre in South Arkansas.  Through a comprehensive scientific analysis of the root data, the methodology and the results used by EPA and its contractor, the TMDL was found to be in error on several points.  These errors were used by GBMc and a legal team to request the TMDL be repealed.  EPA posted formal withdrawal of the TMDL in the Federal Register on March 14, 2012.



Completed toxicity reduction evaluation at a fertilizer manufacturer allowing compliance with sub-lethal NPDES permit limits. Cause of failed Whole Effluent Toxicity testing determined to be waste water treatment polymer for control of TSS in final discharge. 



Successfully completed a wasteload allocation study for an oil refinery that discharges into the Washita River in Oklahoma.  This study was completed in 2011 on an expedited schedule of only six months.   The study included: a low flow field study, time of travel analysis, geomorphic assessment and Qual2k modeling.  Low flow data was used to calibrate the model to several parameters including dissolved oxygen, ammonia and CBOD-fast.   The modeling was approved by the ODEQ and EPA and permit limits established based on model results.



Completed a stream mitigation project in 2010 for a country club in Central Arkansas.  The project required the relocation of approximately 200 feet of stream channel with the new channel being designed using natural channel design techniques (Rosgen, 1996).  The riffle pool complex stream was designed to include grade stabilization, engineered riffles and bioengineered bank stabilization.  The new channel was competed in 2010 and has continued to be stable and functional.



Provided expert testimony in support of a Plaintiff's lawsuit that upstream development resulted in injury to Plaintiff's downstream property and lakes. Resulting finding for the Plaintiff required restoration, increased BMP activities and long term monitoring of future upstream development.



Developed and implemented a plan to increase the water storage level in a city-owned reservoir to enable additional cooling water sales to an electric power generation facility.



GBMc provided technical, regulatory and expert witness support during the NPDES permitting process for a new multi-user treated wastewater pipeline in South Arkansas.  Specific activities included field studies, water quality modeling, aquatic toxicity reviews, preparation of the joint NPDES application, review of draft and final permits and technical and regulatory support during the appeal of the permit through the adjudicatory and legal appeal process.  This multi-year process culminated in the issuance of the Final Permit after a ruling by the AR Supreme Court.



Completed a comprehensive watershed management plan (WMP) for an urbanizing northwest Arkansas stream system.  The plan identified 14 significant impacts/disturbances that needed attention to improve water quality and aesthetics.  The plan has been used as a guide for implementation of stream improvements and pollution prevention.  Three EPA 319 grants have been received based on WMP recommendations.   Projects funded by the grants have included stream restoration, and construction of regional storm water treatment features.  The most recent project is currently in its design phase.



Developed chemical production facility alternatives to discharge configuration (multiport diffuser), allowing compliance with NPDES permit for dissolved minerals and eliminating an attractive nuisance (heated discharge during the winter months) to an endangered species, the Florida Manatee.