Arizona Experience:

City of Phoenix and Participants Water Quality and NPDES Permitting Support
Program Manager and principal water quality consultant: Provided senior level water quality management support to the cities of Phoenix, Mesa, Scottsdale, Glendale, and Youngtown (Sub- Regional Operating Group) for NPDES permitting of the 91st Avenue Wastewater Treatment Plant. Biomonitoring testing, toxicity persistence evaluation, permit negotiations, alternative test species development and expert witness testimony support.

Salt River Project, Tempe, Arizona - Water Quality Monitoring, Taste and Odor Evaluation, Permitting
Program Manager: Provided senior level water quality support for a project to develop a state-of-the-art water quality monitoring system to be located on SRP canal supply system. Major project activities include pollutant and indicator monitoring equipment evaluations, system integration, communications, acute event alarms, point and non-point source analysis, and sampling records. Provided expert consulting to support submittal to U.S. EPA Region 9 on water quality management of blended surface and groundwater supplies.

Pima County Wastewater Management Department; Tucson, Arizona
NPDES permitting and expert witness testimony support regarding implementation of biomonitoring. Co-project manager for Toxicity Control Program.

California Experience:

Goldenbell Mining Corporation, Pine Tree Project Baseline Studies
Senior Aquatic Ecologist: Responsible for aquatic ecology component of a comprehensive water resources baseline study for proposed open pit and underground gold mine near Mariposa, California. Prepared input to appropriate sections of the California Environmental Impact Report.

Syar Industries, Napa, California, Russian River Aggregate Study
Principal Aquatic Ecologist: Managed project for water quality and aquatic ecology on the Russian River near Healdsburg, California. Proposed methods of fisheries habitat enhancement to coincide with aggregate extraction from the Russian River.

City of San Bernadino Stream Classification Proposal
Responsible for designing and conducting biomonitoring testing for San Bernardino, California, in support of the city's stream classification proposal. Acute and chronic toxicity tests using Ceriodaphnia dubia and fathead minnows were conducted on city effluent and Santa Ana River water. Evaluated the potential impacts of city wastewaters to aquatic life in the Santa Ana River.

Colorado Experience:

Platte River Power Authority, Fort Collins, CO - Hamilton Reservoir Management Program - Rawhide Generating Station
AATA was retained by PRPA to conduct specific limnological investigations and assessments of the water quality in Hamilton Reservoir, a 500-acre cooling reservoir for the 250MWe coal-fired power plant. The control of condenser scaling is critical, and depends upon limnological management using physical, chemical, and biological controls. AATA assessed the impacts of changing water sources upon the limnology of the reservoir and the operation of the plant. Managed project for interdisciplinary study and review of cooling reservoir aeration and chemical stability project. Evaluated effects of aeration on eutrophication and pH. Prepared reservoir operational management plan.

Denver Water Department - System-wide EIS Reservoir Water Quality Review
Managed project that analyzed water quality data for the South Platte, Williams Fork and Blue River drainages in Colorado. Reviewed and revised post-project reservoir water quality projections. Conducted limnological modeling study for impact assessment of existing reservoirs (Cheesman, Dillon, Green Mountain, Gross, and Chatfield) and proposed reservoirs (New Cheesman, Eastbrook, and Two Forks). The modeling effort utilized the Canfield-Bachman and Clean Lakes models. Key member of Interagency Water Task Force comprised of EPA, State of Colorado, Crops of Engineers, and Denver Water Department.

Denver Water Department - Two Forks Water Quality Base Case Prediction
Managed project that included water quality modeling for predictive limnology of the proposed Two Forks Reservoir, a 1.1 million acre-foot reservoir located on the South Platte drainage, Colorado. Utilized Corps of Engineers WQRRS model.

Denver Water Department - 208 Planning Area Review and Testimony
Performed reconnaissance of water quality impacts in the Region 12 Planning Area of Colorado (Summit, Grand, Routt, Pitkin, Eagle, and Jackson Counties). Reviewed 208 Areawide Water Quality Management Plan and presented expert witness testimony before the Colorado Water Quality Control Commission on water quality impacts in the area.

Denver Water Department - System-wide and Site-Specific EIS
Ongoing project providing limnological, water quality, and other support to the Denver Water Department. Activities include consultation on water quality, eutrophication, and general limnological monitoring and modeling, as well as water resource planning and support, impact assessment support, and field data collection support. Performed downstream impact assessment for threatened and endangered species.

Denver Water Department and Summit County Participants - Lake Dillon Eutrophication Control Project
Managed project to evaluate over 50 different alternatives for point and non-point source phosphorous control in the Lake Dillon watershed. Evaluated existing data and provided modeling analysis using eutrophication models including Dillon Clean Lakes model. Managed engineering and costing analyses to rank various alternatives.

Taranto, Stanton, Tagge; Denver, Colorado - Environmental Analysis of Cuchara Valley 201 Facilities Plan
Managed project to complete Environmental Analysis Report for a wastewater treatment facility serving the town of Cuchara, Colorado and Cuchara Valley Ski Resort. Detailed analysis of water quality and aquatic ecology was completed to determine impacts of effluent on downstream beneficial uses.

Metropolitan Denver Sewage Disposal District - Segment 15 Platte River Use Attainability Study
Conducted modified use attainability study of Segment 15 of the South Platte River, Colorado. Evaluated previous modeling efforts suing QUAL-II water quality water model, attainability of water quality goals and standards, and aquatic ecology of the reach.

Kiowa Resources, Inc. - South Platte River, Denver, Colorado.
Evaluated potential water quality impacts to industrial, municipal, and agricultural uses along the river. Conducted mass balance modeling to predict water quality conditions in the river as a result of the project. Evaluated predicted water quality from the exchange reservoir with water quality from a major regional water supply to assess potential treatment costs resulting from the water supply.

Dyecrest Dairy
Project Manager for conducting a water quality assessment and regulatory compliance review for evaluating non-point source runoff and waste disposal practices from a large dairy farm in Colorado.

Cities of Northglenn, Frisco and Elbert NPDES WET Testing
Conducted Whole Effluent Toxicity testing for Colorado municipalities. Responsible for project design management technical assistance and data review for NPDES acute biomonitoring testing using Ceriodaphnia dubia and fathead minnows as test organisms.

City of Colorado Springs — NPDES Support
Authored the water quality section that evaluated the effects of the City's NPDES discharge on the State of Colorado's use-attainability criteria for Fountain Creek. Un-ionized ammonia and physical habitat in the creek were central issues of concern.

Idarado, Inc. Ridgeway Reservoir CERCLA Project
Responsible for the study design, implementation and evaluation of the effects of mine metal drainage on the aquatic productivity of a reservoir in southwestern Colorado. Conducted fish sampling, algal growth potential bioassays, chlorophyll determination, water quality sampling, algal identifications, and report writing.

Arapahoe Water and Sanitation District
Monitored nutrient loading and problematic algal blooms in Cherry Creek Reservoir, Colorado.

ASARCO, Inc.
Investigated the effects of a lead and zinc mining operation on water quality, periphyton communities and fish habitat in Iowa Gulch, Colorado.

THK Associates and Concord Development Corporation
Designed pond management plans to enhance recreation and fishing opportunities while controlling nuisance growths of algae and aquatic weeds in Colorado.

Idaho Experience:

J.R. Simplot Company Portneuf River Study
Conducted aquatic environmental impact assessment of ammonia effluent on indigenous periphyton, macroinvertebrates, and fish of the Portneuf River, Idaho.

Montana Experience:

Arco, Inc. Warm Springs Ponds CERCLA Feasibility Study
Evaluated the Silver Bow Creek feasibility study for the Warm Springs Ponds operable unit. Critiqued the Montana Department of Health and Environmental Services seven alternatives for site clean-up concerning impacts and protection of aquatic life.

Nevada Experience:

Twin Creeks Mine, Nevada
Specialized aquatic habitat survey of select springs, seeps and perennial drainages around the Twin Creeks Mine, Winnemuca, Nevada. Survey was designed to evaluate the potential impacts of mine de-watering on peripheral habitat. Conducted habitat assessment and population estimates of amphibian and avian populations, with primary concern for local threatened/endangered species.

Barrick Goldstrike Mines, Nevada - Environmental Baseline Report
Performed analyses of hydrologic, water quality, and temperature data in order to assess surface water resources within the study area for suitability of endangered Lahontan Cutthroat Trout habitat. Correlated these quantitative field data with more qualitative habitat evaluation procedures in order to better understand the key parameters and limitations of aquatic habitat.

Newmont Gold Co., Nevada - Environmental Baseline Report
Performed analyses of hydrologic, water quality, and temperature data in order to assess surface water resources within the study area for suitability of endangered Lahontan Cutthroat Trout habitat. Correlated these quantitative field data with more qualitative habitat evaluation procedures in order to better understand the key parameters and limitations of aquatic habitat.

Freeport/McMoRan Gold Company; Big Springs Project, Nevada
Biological Assessment/Section 7 Consultation on the Lahontan Cutthroat Trout
Conducted detailed biological/aquatic ecology investigation in the Upper North Fork Humboldt River in Nevada. Detailed fisheries studies included specimen collection and U.S. Forest Service Level III physical habitat analysis. Laboratory analysis was performed on aquatic benthic samples, fish species, and water quality. Prepared Biological Assessment Report on Lahontan Cutthroat Trout.

Barrick Goldstrike Mines, Inc.
Managed an environmental baseline survey on Lahontan cutthroat trout (Onchorhynchus clarki henshawi) in the upper Rock and Willow Creek drainages on behalf of BGMI. Lahontan cutthroat trout (LCT) are a threatened species. Performed summer low flow surveys documenting LCT critical low flow and high temperature regimes, including stream gauging, installation of in-stream continuous temperature monitors, water quality sampling, and biological surveys of selected stream segments (Upper Willow, Lewis, Nelson, Toe Jam and upper Rock Creek in the Tuscarora Mountains, and Frazer Creek, Castle Ridge, northeast of Elko, Nevada. Performed level 3A and 3B physical habitat surveys on 38 sites in these streams according the USBLM methodologies to document riparian conditions. Objective of the study was to provide up to date environmental data on streams supporting LCT to optimize management.

Newmont Gold Company
Performed a Lahontan cutthroat trout environmental baseline survey on Little Jack, Coyote, Beaver Spring and Maggie Creeks draining the east slope of the Tuscarora mountains, Nevada. Performed summer low flow surveys documenting LCT critical low flow and maximum temperature regimes, including stream gauging, installation of in-stream continuous temperature monitors, water quality sampling, and biological surveys of selected stream segments. Objective of the study was to provide up to date environmental data on streams supporting LCT to optimize management.

New Mexico Experience:

Los Alamos National Laboratory - Santa Fe Engineering Ltd.
Los Alamos National Laboratory NPDES Permitting and Toxicity Management Program
Program Manager NPDES permitting support program at Los Alamos National Laboratory (LANL), Los Alamos, New Mexico. Provide technical water quality aquatic ecology, and risk assessment support regarding implementation of biomonitoring at LANL. The LANL permit covers 129 different outfalls of various types, and thus represents one of the most complex NPDES permits in the U.S. Design of a Toxicity Management Program that includes state-of-the-art toxicity screening analyses and ecological risk assessment.

Wyoming Experience:

TST, Inc. of Denver
Performed water quality sampling and analysis of Fremont Lake in Pinedale, Wyoming to facilitate selection of optimum depth location for a new water supply intake and pipeline structure.

Salt Creek CO2 Enhanced Oil Recovery EA
Anadarko Petroleum Corporation-Howell Petroleum Company, Wyoming

Principal-In-Charge. AATA served as principal environmental management and permitting consultant for fast-track EA under BLM NEPA rules. Baseline investigations, laboratory analysis, impact assessment, and report production were performed and a FONSI obtained in less than 6 months.