Wastewater Treatment Analysis and Design

Large Port OrchardMr. Samstag has worked as project manager, process engineer, or design engineer on over 100 wastewater treatment plant studies and designs ranging in size from 300,000 gallons per day (1,100 m3/day) to 250 million gallons per day (950,000 m3/day). He has experience with nearly every unit process currently used in modern wastewater treatment from the plant headworks to disinfection and effluent filtration and including design of solids handling processes for thickening, digestion, dewatering, and composting. He has specialized in biological treatment: analysis of activated sludge biological nutrient removal and sedimentation. He has also has experience with biological aerated filters, trickling filters, rotating biological contactors, and membrane bioreactors.

Wastewater Treatment Facilities Planning and Evaluation

Post Secondary 3 mgL BAF DNF Alternative

• Nitrogen Removal Study, City of Tacoma, Process engineer and principal author of a report evaluating process alternatives for upgrade of the 60 mgd (227,000 m3/day) HPO Central Treatment Plant and the 7 mgd (26,000 m3/day) capacity North End Treatment Plant for nitrogen removal. The study was funded by the City of Tacoma and the Washington State Department of Ecology. The study evaluated a wide variety of potential nitrogen removal technologies eventually selecting post-secondary biological aerated and denitrifying filters for the CTP and post-secondary membrane bioreactors (MBR) for the NETP.

West Point Nitrogen Removal Study Cover Page• West Point Nitrogen Removal Study, King County, Process engineer and principal author of a report evaluating process alternatives for upgrade of the 215 mgd (814,000 m3/day) West Point Treatment Plant for nitrogen removal. The study evaluated a wide variety of potential nitrogen removal technologies including modified Ludzack-Ettinger (MLE) and Bardenpho suspended growth processes with membrane separation, integrated fixed film activated sludge (IFAS) processes and post-secondary biological aerated and denitrifying filters (BAF / DNF). Bardenpho MBR was selected as the representative alternative to represent potential impacts of conversion of Puget Sound’s largest WWTP to nitrogen removal.

Renton_aerial-216-55• South Plant Nitrogen Removal Study, King County, Process engineer and principal author of a report evaluating process alternatives for upgrade of the 144 mgd (545,000 m3/day) South Treatment Plant for nitrogen removal. The study evaluated a wide variety of potential nitrogen removal technologies including modified MLE and Bardenpho suspended growth processes with membrane separation, IFAS processes and post-secondary BAF / DNF. Parallel MLE or Bardenpho MBR processes were selected as the representative alternatives for, respectively, 8 mg/L and 3 mg/l total inorganic nitrogen (TIN) permit scenarios to represent potential impacts of conversion of this large WWTP to nitrogen removal.

• Project manager and process engineer for a Comprehensive Sewage Facilities Planning study for the City of Aberdeen, Washington. In this project Mr. Samstag led client contact, process evaluation, and report writing for a comprehensive sewage facilities plan. The project included SWMM modeling of the collection system calibrated to recent storm-induced peak flows to establish design future peak flows, capacity rating of pumping and treatment facilities and evaluation of upgrade alternatives including modifications for improved ammonia removal and disinfection, solids handling facilities, and peak flow management facilities.

Post Point• Project manager and process engineer for a re-rating and energy audit study for the City of Bellingham, Post Point Wastewater Treatment Plant. In this project Mr. Samstag performed analysis, field tests, and computer modeling to evaluate the appropriate treatment rating for this nominally 20 mgd (76,000 m3/day) capacity plant. The Post Point Plant uses the high purity oxygen activated sludge process with multi-hearth incinerators for solids stabilization.

• Wastewater process engineer for the Carnation Wastewater Treatment Facility, King County, Washington, Department of Natural Resources. The project consists of facility planning, preliminary design, design, and construction management services for a new 0.5 mgd (1,900 m3/day) membrane bioreactor (MBR) wastewater treatment plant.

• Capital Facilities Plan, City of Marysville, Washington – Project manager and process engineer for evaluation of options for upgrade and expansion of a 6-mgd (23,000 m3/day) capacity aerated / facultative lagoon system with effluent filtration. TMDL limits on discharge to the Snohomish River will require a high degree of removal of ammonia and CBOD. A series of alternatives including advanced treatment and continuation of the current discharge versus transfer of the effluent to a new outfall in Puget Sound were considered.

• Lagoon Biosolids Investigation, City of Oak Harbor, Washington – Project manager and process engineer for evaluation of operation of the Seaplane Lagoon Wastewater Treatment Plant. As part of the project, he evaluated the performance of an aerated lagoon treatment works. The evaluation emphasized interference with treatment performance by accumulations of lagoon biosolids and the impact of nitrogen transformations in the lagoons on effluent disinfection.

• Comprehensive Sewage Facilities Plan, City of Aberdeen, Washington – Project manager and process engineer for a comprehensive plan and capacity evaluation of this 8.75 mgd (33,000 m3/day) activated sludge wastewater treatment plant. Upgrade alternatives for a twenty-year planning period were developed.

Renton RTD Test Curve• Process engineer for evaluation of the aeration system for the South Plant at Renton operated by King County Department of Natural Resources and Parks, Wastewater Treatment Division. The South Plant is an activated sludge plant with a capacity of 110 mgd (416,000 m3/day) using fine bubble aeration. In this project, Mr. Samstag directed dye testing in the aeration tanks to determine their hydraulic characteristics and used commercial and custom models to test the efficiency of different strategies for control of dissolved oxygen.

• Secondary Treatment Facilities Upgrade and Expansion, Allegheny County Sanitary Commission (ALCOSAN), Pittsburgh, Pennsylvania – Process engineer for evaluation of primary treatment facilities for combined sewer flows up to 625 mgd and expansion of the 200 mgd (750,000 m3/day) secondary treatment capacity to 275 mgd (1,0410,000 m3/day). Mr. Samstag served as process engineer for plant testing to confirm hydraulic and process characteristics of primary treatment facilities with loading rate as high as 4000 gallons per day per square foot (163 m/day).  Mr. Samstag developed the mass balance for the upgraded plant and evaluated aeration system requirements. New fine bubble aeration disc diffusers were evaluated to supplement existing tubular diffusers.

• Wastewater Facilities Plan Update, Spokane Advanced Wastewater Treatment Facility, Spokane, Washington – On the Spokane project Mr. Samstag served as process consultant for evaluation of requirements for effluent toxicity control and nitrification for this 40 mgd (151,000 m3/day) facility. Evaluations were also conducted into the feasibility of nitrification to a high degree to meet changing regulatory requirements.

lott_first_anoxic• Nitrogen Removal Facilities, LOTT Wastewater Treatment Plant, Olympia, Washington – Performed process evaluation and design for new aeration and biological nitrogen removal (BNR) tanks for conversion of a 22 million gallon per day high purity oxygen (HPO) activated sludge facility. The LOTT project was Washington’s second plant designed for nitrogen removal with its most severe effluent standard of 3 mg/l total nitrogen. The design for LOTT used the four-stage Bardenpho™ process.

• Wastewater Reclamation Facilities Design, City of Fontana, California – Process specialist for preliminary design of anoxic / aerobic suspended growth biological nitrogen removal processes for this 8 mgd (30,000 m3/day) capacity plant.

• Wastewater Treatment Plant Engineering Report, Olympus Terrace Sewer District, Mukilteo, Washington – Project manager, process engineer, and partial author of an engineering report evaluating capacity and future needs for a 2.2 mgd (8,300 m3/day) capacity oxidation ditch wastewater treatment plant. The work included evaluation of alternatives for upgrade of disinfection and digestion facilities for the plant to allow increase in the rated capacity of the plant to 2.6 mgd (9,800 m3/day). The report recommended short-term continuation of dewatered sludge haul and installation of auto-thermal, aerobic digestion as the long-term upgrade strategy. It also recommended low-pressure ultraviolet disinfection for upgrade of plant facilities.

• Wastewater Treatment Engineering Report and Facilities Plan, Town of Coupeville, Washington – Project manager, process engineer and partial author of a report evaluating capacity and future needs for 250,000 gallon per day (950 m3/day) capacity oxidation ditch wastewater treatment plant. The work included a capacity analysis of the effluent outfall and each unit process in the treatment and consideration of future capacity needs.

• Appropriate Technology for Sewage Pollution Control for the Wider Caribbean Region, United Nations Environment Programme, Kingston, Jamaica – Project manager and partial author of a report outlining best management practices for sewage pollution control for the wider Caribbean region. This region has a population of over 50 million spanning the multi-national zone from Brownsville, Texas to the Republic of Trinidad and Tobago. The report focused on technologies for sewage treatment in the coastal regions bordering the Gulf of Mexico and Caribbean Sea. As part of the work, an extensive literature review was completed. The report identified appropriate technologies for different community and industrial types within the region. A panel of experts selected by the UNEP reviewed the report.

OTSD Schematic• General Sewer Plan Amendment, Olympus Terrace Sewer District, Mukilteo, Washington – Process engineer and partial author of a general sewer plan for a district including a 2.2 mgd (8,300 m3/day) capacity oxidation ditch wastewater treatment plant. The work included a capacity analysis of each unit process in the treatment plant, which recommended improvements to headworks, return activated sludge pumping, disinfection, and digestion facilities to allow increase in the rated capacity of the plant to 2.6 mgd (9,800 m3/day).

• Comprehensive Sanitary Sewer Plan Update, Marysville, Washington – Project manager and process engineer for evaluation of wastewater treatment and pumping facilities for this Puget Sound community of 40,000 persons. The report investigated alternatives for upgrade of a 6.1-mgd (23,000 m3/day) capacity complete-mix aerated lagoon/oxidation pond system with partial effluent filtration to a future flow of 12 mgd (45,000 m3/day).

• Wastewater Collection and Treatment Facilities, Quileute Tribe, La Push, Washington – Project manager and partial author of an evaluation of upgrade alternatives for a 300,000-gallon per day capacity aerated lagoon system discharging to a drain field system in the inter-tidal zone of the Pacific Ocean. Alternatives investigated included recirculating sand filter, hypochlorite disinfection, and upgraded lagoon, sludge removal, and haul facilities.

• Wastewater Collection and Treatment Facilities Evaluation, University of Pittsburgh Applied Research Center (U-PARC), Pittsburgh, Pennsylvania – Project manager and process engineer for evaluation of wastewater collection, treatment, and discharge facilities rated at 250,000 gallons per day. The treatment facility has been in chronic violation of extremely stringent discharge limitations for mercury, chloroform, and phenol for discharge to a small creek tributary to the Allegheny River. The evaluation investigated options of plant upgrade, pretreatment, river discharge, and connection to an adjacent utility, recommending the latter.

• Basis of Design Report, Brush Creek Water Pollution Control Facility, Municipal Sewer and Water Authority for Cranberry Township, Butler County, Pennsylvania – Project and process engineer for this design report which evaluated upgrade options for this rotating biological contactor (RBC) facility. The report recommended upgrade and expansion to 4.5 mgd (17,000 m3/day) by construction of new activated sludge aeration tanks with fine bubble aeration with demolition of the RBC treatment units. Other facilities to be constructed included new headworks facilities with climber screens and vortex grit removal, additional rectangular chemical primary sedimentation tanks, new rectangular secondary sedimentation tanks, additional traveling bridge effluent filters, new ultraviolet disinfection facilities, and new auto-thermal, aerobic digestion (ATAD) facilities to replace existing PURIFAX® sludge stabilization facilities.

• Secondary Treatment Facilities Upgrade and Expansion, Allegheny County Sanitary Commission (ALCOSAN), Pittsburgh, Pennsylvania – Process engineer for evaluation of primary treatment facilities for combined sewer flows up to 625 mgd (2,400,000 m3/day) and expansion of the 200 mgd (757,000 m3/day) secondary treatment capacity to 275 mgd (1,040,000 m3/day). Mr. Samstag developed the mass balance for the upgraded plant and evaluated aeration system requirements. New fine bubble aeration disc diffusers were evaluated to supplement existing tubular diffusers.

• Wastewater Treatment Facility Odor Investigations, Sea-Tac Airport, Port of Seattle, Seattle, Washington – Project manager and author of an evaluation of odor control requirements for the Industrial Waste Treatment Facility for the Port of Seattle Sea-Tac Airport.

• Wastewater Facilities Plan Update, Spokane Advanced Wastewater Treatment Facility, Spokane, Washington – On the Spokane project Mr. Samstag served as process consultant for evaluation of requirements for effluent toxicity control and nitrification for this 40 mgd (151,000 m3/day) facility. He directed settling column tests as a part of evaluation of operation of the plant in a contact / re-aeration mode. Evaluations were also conducted into the feasibility of nitrification to a high degree to meet changing regulatory requirements.

• Wastewater Facilities Plan, Town of South Prairie, Washington – Project engineer for facilities planning of small-diameter gravity sewers and recirculating sand filter treatment facilities.

• Wastewater Treatment Facilities Investigation, City of Monroe, Washington – Project engineer and author of a report investigating operating problems at a rotating biological contactor facility.

• Wastewater Facilities Investigation, Town of Gig Harbor, Washington – Project engineer and author of a report investigating operating procedures and capacity for an extended aeration wastewater treatment plant.

• Wastewater Facilities Plan, City of Clovis, New Mexico – Process and project engineer for facilities planning for new 4.0 mgd aerated lagoon treatment facilities for a mixed municipal and meat packing waste with effluent reuse by irrigation of corn and milo.

Wastewater Treatment Facilities Design
• Secondary Treatment Expansion Design, Southport AWT, City of Indianapolis, Indiana – Process engineer and principal author of a technical memorandum evaluating for capacity for upgrade of nitrification facilities for the 122 mgd (460,000 m3/day) Southport Advanced Wastewater Treatment Plant.

Post Point• HPO Modifications, City of Bellingham, Washington – Project manager and process engineer for planning, preliminary design, design, and construction management of modifications to the 20 mgd (76,000 m3/day) capacity Post Point WWTP to permit operation of the high purity oxygen (HPO) system in an anaerobic selector mode. New high efficiency aerators and new variable speed drives and mixer controls were installed as part of the project. The City was awarded a grant from the local power company that paid for one half of the cost of the project as a result of significant energy savings. The system has allowed the plant to lower SVI values from an average of150 mL/g to less than 120 mL/g while reducing power demand by approximately 25% and oxygen use by 10%.

• Nitrification Facilities Pre-design, City of Stockton, California – Project and process engineer for preliminary design of nitrification facilities for a 55-mgd (208,000 m3/day) capacity wastewater treatment plant. The project included influent pumps, interconnecting piping, and up-flow biological aerated filters (BAF) for removal of ammonia and future nitrogen removal.

• Wet Weather Treatment Facilities, City of Benicia, California – Project engineer for preliminary design of facilities to increase wet weather flow capacity of the Benicia WWTP from 12 to 31 mgd (45,000 – 117,000 m3/day). New facilities evaluated included influent pumps, bar screens, flow measurement facilities, effluent pumps, and modifications to existing wet weather storage basins.

• Wastewater Treatment Plant Modifications and Effluent Transfer Pipeline, City of Marysville, Washington – Project manager and process engineer for upgrade and expansion of a 6-mgd (23,000 m3/day) capacity aerated / facultative lagoon system with effluent filtration to a year 2010 capacity of 12.7 mgd (48,000 m3/day). The project includes upgrade of existing headworks, influent pumping, aerated lagoon, effluent filtration, disinfection, and effluent pumping systems with addition of a new maintenance building and expansion of the existing administration and laboratory building. Preliminary design includes pilot plant testing of filtration and ultraviolet disinfection equipment. The project also includes 24,000 feet of 36-inch force main to transfer treated effluent to the City of Everett for discharge through a combined new outfall with a large industrial discharger.

Coupeville Aerial• Wastewater Treatment Plant Expansion, Town of Coupeville, WA – Project manager for upgrade of an existing 250,000 gallon per day capacity wastewater treatment facility to 450,000 gallons per day capacity. The project includes design and construction administration for new selector, oxidation ditch, and secondary sedimentation tanks, conversion of the existing chlorine contact channels to ultraviolet disinfection and upgrade of effluent pumping facilities.

• Phase One Improvement to the Aberdeen Wastewater Treatment Plant, City of Aberdeen, Washington – Project Manager and process engineer through 90 percent design for upgrade of secondary treatment facilities for the City of Aberdeen’s 8.75 mgd (33,000 m3/day) capacity WWTP to accommodate interim peak flows and increased loads. The design incorporates staged, anoxic/ anaerobic selectors for settleability control, power savings and alkalinity conservation, a new fine bubble aeration and blower system, and a new secondary sedimentation tank.

• Ultraviolet Disinfection System Design and Construction Management, Olympus Terrace Sewer District, Mukilteo, Washington – Project manager for design of new ultraviolet disinfection facilities for a 2.2 mgd (8,300 m3/day) maximum month flow capacity oxidation ditch treatment plant. As a part of the design, the effluent Parshall flume will be reconfigured to recover wasted hydraulic head. This design includes detailed pre-selection evaluation of low-pressure ultraviolet systems for owner pre-purchase. Final design included modifications to the plant’s standby power generation system and design of a hypochlorite feed system for disinfection of plant process water.

• Predesign, Wastewater Treatment Plant Design, City of College Place, Washington – Process engineer for preliminary design of new sequencing batch reactor facilities for upgrade of this existing plant. New facilities will have a capacity of 1.65 mgd (6,250 m3/day). This project was designed to meet stringent effluent limits of BOD, TSS, and Ammonia-Nitrogen for discharge to the Walla Walla River.

OTSD Control• Aeration Control System, Olympus Terrace Sewer District, Mukilteo, Washington – Project manager and process engineer for design of a cyclic aeration control system for an existing 2.2-mgd (8,300 m3/day) oxidation ditch plant. The control algorithm developed for this project turns oxidation ditch aerators and a propeller mixer on and off based on measured values of dissolved oxygen (DO) and oxidation-reduction potential (ORP).

• Upgrade and Expansion of the Wastewater Treatment Plant, Blaine, Washington – Process engineer for predesign of facilities for upgrade of an existing rotating biological contactor (RBC) wastewater treatment plant by construction of new sequencing batch reactor tanks. The upgraded plant will have an ultimate maximum month flow capacity of 2.35 mgd (8,900 m3/day).

• Wastewater Treatment Facility Design, Snoqualmie, Washington – Design engineer for effluent ultraviolet disinfection and filtration facilities for this 1.6-mgd (6,100 m3/day) advanced wastewater treatment facility for the City of Snoqualmie. This facility uses the modified Bardenpho process for biological removal of nitrogen and phosphorus and interim sludge disposal to an existing wastewater treatment oxidation pond.

• Municipality of Metropolitan Seattle, Emergency Wastewater Reuse Project, Seattle, Washington – Responsible for process and detailed design of a 0.75 mgd (2,800 m3/day) wastewater reclamation plant for secondary effluent from the Municipality of Metropolitan Seattle’s Renton Sewage Treatment Plant. The reclamation plant used continuous backwash sand filters and ultraviolet disinfection to produce water for street washing and other uses. The project was completed on an emergency basis in the summer of 1992 to supply water during severe drought conditions in the Seattle area.

ulu_pan_dan_photo Extension of the Ulu Pandan Sewage Treatment Works, Republic of Singapore – Project and process engineer for preparation of the preliminary engineering report and process engineer for design of extension of the 286,000 m3/day (75.5 mgd) Ulu Pandan Sewage Treatment Works in Singapore. The upgraded plant was designed for an ultimate, average-flow capacity of 480,000 m3/day (127 mgd). The liquid treatment module includes a two-stage activated sludge process with both lamella and stacked secondary sedimentation tanks. A new plant water system uses ultraviolet disinfection and automatic strainers. Solids handling improvements included new centrifuges for thickening and dewatering and new custom-designed egg-shaped anaerobic digestion tanks to replace existing facilities for the entire existing works. New facilities were designed for complete odor capture and treatment and eventual use of the covered portions of the liquid treatment module as a public park. Mr. Samstag provided process design for all new facilities and detailed design for the new liquid treatment module. The upgrade project also included a new headworks.

Ina_Road• Upgrade and Expansion of the Ina Road Water Pollution Control Facility, Pima County, Tucson, Arizona – Process engineer for preliminary design of the upgrade and expansion of the 25-mgd (95,000 m3/day) Ina Road Water WPCF to 38 mgd (144,000 m3/day). This preliminary engineering effort evaluated upgrade of the plant for future nitrogen removal requirements and expansion to serve future growth. A wide range of nitrogen removal alternatives was evaluated for implementation including two-stage anoxic/aerobic treatment, land application, and split flow alternatives. A split flow alternative was selected with partial reuse of effluent for agricultural and park irrigation and provision for ultimate construction of modified Ludzack-Ettinger process tanks for nitrogen removal.

LOTT

• Nitrogen Removal Facilities, LOTT Wastewater Treatment Plant, Olympia, Washington – Performed process evaluation and design for new aeration and biological nitrogen removal (BNR) tanks for upgrade of the existing  high purity oxygen (HPO) activated sludge facility to provide for 22 million gallon per day (83,000 m3/day) capacity for summer nitrogen removal. The LOTT project was Washington’s second plant designed for nitrogen removal with its most severe effluent standard of 3 mg/L, total nitrogen. The design for LOTT used the four-stage Bardenpho™ process. Mr. Samstag led a team in field dye and solids testing of existing sedimentation tanks to establish their capacity under future design loads. Testing was also conducted at the Kelowna, British Columbia Bardenpho™ facility as a part of the work.

• Wastewater Reclamation Facilities Design, City of Fontana, Fontana, California – Process specialist for preliminary design of anoxic / aerobic suspended growth biological nitrogen removal processes for this 8 mgd (30,000 m3/day) capacity plant. A two-stage modified Ludzack-Ettinger process was selected for biological nitrogen removal including anoxic tanks, aeration tanks with fine bubble disc aeration, and rectangular secondary sedimentation tanks of the R.H. Gould design. Ultimate plant capacity will be 32-mgd (121,000 m3/day) average annual flow. For this project, Mr. Samstag led a team in field-testing of a plant currently serving the Fontana drainage to establish design sludge settleability characteristics.

West Point

• West Point Treatment Plant Expansion Predesign and Design Development, Municipality of Metropolitan Seattle, Seattle, Washington – Process engineer representing the Municipality for predesign and design development for addition of secondary treatment facilities to Metro’s 215 mgd (814,000 m3/day) plant discharging to Puget Sound. Prepared scopes of work for efforts by consulting engineers and participated in planning and execution of the work. The work also included upgrade and expansion of facilities for solids thickening, anaerobic digestion and final solids dewatering. Mr. Samstag led a Metro review team in preparation of an evaluation of wastewater treatment enclosure strategies for the West Point project.

• Predesign Report, Wastewater Facilities Improvements, Richmond Beach Treatment Plant, Municipality of Metropolitan Seattle, Seattle, Washington – For the Richmond Beach project Mr. Samstag led a Metro staff team in preparation of a predesign report for analysis of treatment alternatives for Metro’s 2.8 mgd (10,600 m3/day) capacity primary treatment plant in North King County. Activated sludge, TF/SG, and biological aerated filter (BAF) secondary treatment alternatives were investigated. This project won an Award of Achievement from the Society for Technical Communication in 1988.

• Wastewater Collection and Treatment System, City of Forks, Washington – Project leaderForks Aerial and designer for the Forks wastewater treatment plant, the first in the State of Washington to be designed for biological nitrogen removal. The Forks plant uses cyclic, extended aeration to achieve 98 percent removal of organic materials and 80 percent nitrogen removal. Sludge is stabilized in an earthen extended aeration basin and beneficially re-used by land application to adjacent forestland. Wastewater effluent is discharged through rapid infiltration basins. This innovative 0.3 mgd (1,100 m3/day) capacity treatment plant won the Consulting Engineers Council honor award for design in 1988 and the national award from the Environmental Protection Agency as the best operating treatment plant in its class in the United States in 1989. It won the same award again in 1993. It has received awards from the Washington State Department of Ecology repeatedly over its 30 year life.

Renton_aerial-216-55• Municipality of Metropolitan Seattle, Enlargement II, Renton Sewage Treatment Plant – For the Renton Enlargement II projects Mr. Samstag was responsible for detailed design of secondary sedimentation tanks, inter-facility tunnels, site civil work, and plant process drawings. The Renton plant was at the time Washington State’s largest secondary treatment plant with a capacity of 72 mgd (270,000 m3/day). It won an honor award for design in the same year as the Forks project and a WDOE and national EPA award for excellence in meeting the requirements of its discharge permit in 1989.

• City of Newberg Wastewater Treatment Facilities, Newberg, Oregon – Design engineer for solids handling facilities. These included dissolved air flotation sludge thickening units and dewatering by belt filter presses. Dewatered sludge may be transported to either direct land application re-use or to a vendor-designed in-vessel composting system. Mr. Samstag performed conceptual design of the composting system before turnkey bid. As a part of the Newberg project he developed a computer program to perform mass balances, size reactor vessels, calculate aeration requirements, and predict performance of composting facilities for wastewater sludge.

• Wastewater Collection and Treatment Facilities, Village of Nulato, Alaska – Design engineer for facultative lagoon treatment facilities for an Alaska native village in the Yukon River drainage.

Large Port Orchard• Port Orchard / Kitsap County Sewer District #5 Wastewater Facilities Improvements, Port Orchard, Washington – Project and process engineer for 90 percent design of the Port Orchard / Kitsap County Sewer District #5 Wastewater Facilities project. This project constructed 2.8 mgd (10,600) activated sludge treatment, new wastewater pumping and transfer, and a 36-inch diameter (900 mm), submarine outfall for this Puget Sound community. The plant provided a new operations center (shown above) with central access to both new liquid treatment facilities and solids digestion and dewatering facilities.The treatment plant won an honor award in the 1986 Consulting Engineer’s Council competition for excellence in design. It also won a Washington Department of Ecology award for achieving its wastewater treatment goals in 1988.

• LOTT Wastewater Treatment Facilities Improvements, Olympia, Washington – Project leader for design of sedimentation tanks and solids handling facilities for the original LOTT plant including detailed design of new secondary sedimentation tanks, dissolved air flotation sludge thickeners and solid bowl centrifuge dewatering equipment. Mr. Samstag also performed process design for new anaerobic digestion tanks. He was resident engineer for site earthwork and construction of sedimentation tanks. This plant was designed for a 14-mgd (53,000 m3/day) maximum month capacity for mixed municipal and high strength, brewery wastewater.

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