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Kevin Snodgrass Water Featured Operator: Kevin Snodgrass By Bob Foerster, NvRWA Kevin Snodgrass is the Kevin graduated from Simi Lines Public Works Director Featured Valley High School in for the Fallon Paiute Operator California. He earned Shoshone Tribe. The a Distribution Operator water system spans Grade 2, and more recently, thirteen miles from a Treatment 1 Certification a neighborhood from the Intertribal Council near Fallon to Stillwater. of Arizona. State certification Wastewater collection systems, is encouraged, but voluntary for with two lift stations and aeration operators of tribal systems. With Kevin in the leadership role, the transition to arsenic treatment Water Lines is the resource has gone smoothly. He has met newsletter and calendar of the the challenges of starting a new Nevada Drinking Water and facility without direct experience at Wastewater Training Coalition. operating. Many Nevada systems will have arsenic treatment installed Volume 22 Fall 2006 Issue in the next few years. To get an idea of the level of difficulty, let’s have a look at the processes. Inside this issue.... Two wells, both located in the Spigot Q & A: ......................3 plant yard, are used alternately to Regulatory Update.....................3 supply water at 320 gpm summer / 220 gpm winter. The raw water New Board Members.................4 Kevin Snodgrass of the Fallon Paiute Shoshone Tribe arsenic concentration is in the range Featured System: Hacienda.......4 of 120 micrograms per liter, and Safety Zone..............................5 pond treatment – evaporative pond must be reduced consistently by disposal, serve two subdivisions in the treatment process to less than Las Vegas Springs Preserve....6 the Stillwater area. Others are on 10 micrograms per liter. The pH of Training Calendar for 2006..........7 individual septic, or connected to the the raw water is 9.2. The process Fallon municipal system. Snodgrass, is liquid phase iron adsorption, along with two employees, Arlen followed by membrane filtration. Spotlight on: Baca and Cody Downs covers a lot As water enters the building, carbon Southern Nevada of the valley. dioxide is injected to decrease the pH to approximately 6.5, and Water Lines is funded by When Kevin came to the system in ferric chloride (FeCl3) is added. 2002, it was served by wells without Arsenic adsorbs efficiently to iron the Nevada Division of treatment. An arsenic treatment at this pH. As in conventional Environmental Protection facility was commissioned in filtration processes, the iron is in a January, 2005. He had worked coagulated state and easily captured at the water and wastewater by filtration. The Pall brand Editor, Brent Farr, P.E. systems in Gabbs for over twelve membrane filters have a pore size years, and before that was in gold of 0.1 micron. Filtered water flows Editor, and Production, Joe Beard Jr. mining operations near Austin. (Continued on page 2) Featured Operator: Kevin Snodgrass (Continued from page 1) to an air stripping tank where CO2 as opposed to fifteen ppm for then hauled to a landfill. Addition is physically removed, increasing complete removal. of polymer was discontinued when the pH to 8.0, a point where the Finished water is pumped directly it was found to clog felt bin liners, water is non-corrosive. Product to the distribution system, which and not needed for solids separation. water is then chlorinated to maintain includes a two hundred fifty Felt liners are discarded with the a free available residual chlorine thousand gallon concrete storage sludge. The $1.55 million arsenic concentration of 0.6 to 1.1 mg/L, tank on nearby Rattlesnake Hill. facilities were designed by CH2M and pumps equipped with variable Water then gravity flows from the Hill, with funding from EPA and frequency drives (VFD) move it to Rattlesnake tank to the Stillwater Indian Health Services, and project the distribution system. area, filling a one hundred twenty- administration by IHS. Treatment five thousand gallon elevated added a cost per thousand gallons The fifteen filters, each module storage tank. The system currently of $0.701 in 2005. containing 538 square feet of filter has a total of three hundred thirty area, are backwashed automatically connections, and capacity for As part of the arsenic treatment every twenty minutes. Backwash ninety-nine additional residential upgrades, SCADA was added to the water is pumped to a clarifier connections. system. The wells and arsenic plant which is outfitted with lamella operate when the Rattlesnake tank plates. Solids are pumped from reaches low level, and stop when the clarifier to sludge bins for the tank is filled. The SCADA dewatering and drying. Supernatant system enables the monitoring of is returned to mix with well water system conditions, and the operator at the beginning of the treatment can dial up or view screens from train. Water draining from the remote computers. This all helps dewatering bins flows to municipal where the operation is covered 24/7 sewers. The automated membrane by a staff of three. Remarkably, system performs a pressure-drop Kevin and crew also help other integrity test every fifty-five hours departments with their projects. of run time. Further membrane filter maintenance includes manual Clean Snodgrass has met the small and Carbon Dioxide Storage at Fallon In Place (CIP), which is carried out large challenges starting up and every three months or whenever System connections are not learning the facility. All of this, differential pressure (transmembrane metered, and summer demand except hypochlorination was new, pressure) reaches 30 psi. The can easily exceed plant and even that is a different setup. three-hour CIP procedure includes production. Having experienced There was a lot to take in, from addition of citric and hydrochloric approximately five breaks yearly, chemical handling to maintenance acids, soaking and rinsing. the asbestos-concrete portions to disposal. The plant takes more of the system are slated for attention than originally projected, The treatment process can achieve replacement; this upcoming and the work group stations itself arsenic concentrations down to project may include metering. at the plant. non-detect levels, but is now run to The Rattlesnake Hill tank, built in target seven micrograms per liter, 1980, was recently cleaned, and Kevin’s future challenges include, meeting the MCL with a thirty a felt-backed, rubberized liner of course the pipe replacement percent safety margin. As well was installed. and looping work, and continuing as saving on chemical costs and to improve the process. Lessons membrane loading, the difference The dewatered sludge, containing learned from this facility will be in sludge quantities is nearly fifty arsenic strongly adsorbed to applied at the upcoming arsenic percent, as the ferric dose can be the iron, is dried for one or two removal project at Schurz on the maintained around eight ppm, months (depending on season), Walker River Paiute Reservation. 2 The Spigot NDEP - Regulatory Update By Dana B. Pennington , NDEP Q & A: The Safe Drinking Water Public Water twenty-seven applications, when Supervision Program was moved to completed, will be presented to the the Nevada Division of Environmental Commission for approval at a later Focus on Protection in August of 2005. It is now date. Fourteen of the arsenic exemption called the Bureau of Safe Drinking eligible systems have not contacted Electrical Water. The Division Administrator, Leo the Division. The ability to apply for Drozdoff and Deputy Administrator, an exemption will expire on January Tom Porta have provided the guidance 23, 2009. Fundamentals to incorporate the program into the structure of the Division. The program Many public water systems will receive has adjusted well to the change under notices from the Bureau concerning Q 1. Resistance is measured in: the leadership of Bureau Chief Doug lead and copper monitoring this a. Direct current Zimmerman and has “settled in” and is year. Large water systems (>3300 b. Ohms comfortable at NDEP. Responsibility persons served) are not eligible for c. Amperage for adoption of regulations, approval of nine year monitoring frequencies and d. Valence shell variances and exemptions, and hearings must monitor at three year intervals. for appeals now resides with the State Small systems that are eligible for a Q 2. In circuits, E represents: Environmental Commission. nine year monitoring frequency must also meet 90th percentile lead levels a. Resistance The Bureau has been busy since the of five parts per billion. If not, the b. Voltage move. Regulations for Operator three year monitoring frequency is c. Execute Certification and Water Quality/ required. Rising population levels d. Induction Groundwater Treatment, temporarily within some water systems also require adopted by the State Board of Health, more samples to be collected. The Q 3. Three-phase motors: were permanently adopted by the State Bureau will contact your system and a. Cost less than comparable single- Environmental Commission. These establish your specific monitoring phase motors regulations became effective on requirements. b. Require less maintenance than October 31, 2005. These regulations single phase motors adopted the revised arsenic rule, the Monitoring for the Revised c. Will easily start a heavy load. revised radionuclide rule, the filter Radionuclide Rule was implemented d. All of the above backwash rule, the enhanced surface in 2005 and is in the second year of the water treatment rule, the variance three-year monitoring period. Several Q 4. Transformers are used to: and exemption rules and revisions public water systems have encountered a. Diffuse electrical current to the lead and copper rule. Primacy elevated levels of uranium. These b. Equalize voltage flow package drafts for the arsenic rule and systems have initiated corrective c. Step up or step down voltage variances and exemptions rule have actions to comply with the maximum d. Measure the flow of current been submitted to the U. S. EPA Region contaminant level of 30 micrograms IX office for review.
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