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Home My WebLink About03.a. Review options for increasing recycled water use by the hydro cleaning crews in the Collection System Operations Division Page 1 of 11 Item 3.a. CENTRAL SAN BOARD OF DIRECTORS . , , . POSITION PAPER . , 0 DRAFT MEETING DATE: MARCH 11, 2019 SUBJECT: REVIEW OPTIONS FOR INCREASING RECYCLED WATER USE BYTHE HYDRO CLEANING CREWS IN THE COLLECTION SYSTEM OPERATIONS DIVISION SUBMITTED BY: INITIATING DEPARTMENT: PAUL SEITZ, COLLECTION SYSTEM OPERATIONS-COLLECTION SYSTEM DIV OPERATIONS DIVISION MANAGER MANAGER REVIEWED BY: ANN SASAKI, DEPUTY GENERAL MANAGER ISSUE Members of the public and District staff have inquired why the Collection System Operations Division (CSO) does not use more recycled water(ReW)when cleaning sewers. In response, CSO has researched the various options, costs, and potential impacts to expand the use of ReW for hydro cleaning operations. BACKGROUND There are two primary methods Central San uses to clean sewers. The first method uses a mechanical rodder and does not require water to operate. The second method uses a pressured water system to provide scouring for the cleaning of the sewer. This method is called hydro cleaning and is primarily used to clean sewers that are impacted by fats, oil and grease (FOG), grit, and debris. The hydro cleaning crews use approximately 5.8 million gallons per year of potable water. CSO's current operating protocol is to maximize cleaning footage and increase efficiencies. ReW is utilized when it is readily available. When ReW is not available, CSO utilizes potable water from the nearest hydrant. By using the nearest hydrant, CSO reduces driving time between filling tanks. This allows CSO to clean sewers more efficiently, which in turn reduces the number of overflows. ReW is only available in Martinez, Pleasant Hill, and San Ramon. It is estimated that for calendar year (CY) 2017, the hydro cleaning crews used a total of 400,000 gallons of ReW for cleaning operations. This represents 7% of the water used on an annual basis. One of Central San's adopted strategies is to "Augment the Region's Water Supply." Additionally, in 2008, the water purveyors located in Central San's service area restricted the use of potable water for cleaning operations due to drought conditions. This restriction was approximately 13 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 3 of 18 Page 2 of 11 months in duration. During this restriction, the hydro cleaning crews used the existing ReW system and staged water tanks throughout Central San. Cleaning footage was reduced by 127 miles or 17% in CY 2009 compared to CY 2010. The attached presentation reviews various options to incorporate additional ReW into operations. These options will augment the region's water supply and help prepare CSO for future restrictions due to drought conditions if they arise. ALTERNATIVES/CONSIDERATIONS CSO has identified four alternatives for consideration. These alternatives vary from partial to full use of ReW for CSO hydro cleaning operations. FINANCIAL IMPACTS The financial impacts vary between the four options. The estimates include the cost for contract labor, fuel, and equipment purchase or rental. These estimates do not include the cost for recycled water or District labor. The cost for the four different options are: Option 1 - $313,000 per year Option 2 - $275,200 per year and a one-time capital cost of$22,000 Option 3 - $37,200 per year and a one-time capital cost of $147,000 Option 4 - $0 per year and a one-time capital cost of$147,000 COMMITTEE RECOMMENDATION The Real Estate, Environmental and Planning Committee reviewed this matter at its meeting on March 11, 2019 and recommended RECOMMENDED BOARD ACTION If the Board wishes to proceed with one of the options outlined above and presented at the meeting, it is staff's recommendation that Option 4 be selected. Strategic Plan re-In GOAL ONE: Provide Exceptional Customer Service Strategy 1 - Build external customer relationships and awareness, Strategy 3- Maintain a strong reputation in the community GOAL SIX: Embrace Technology, Innovation and Environmental Sustainability Strategy 1 -Augment the region's water supply ATTACHMENTS: 1. Presentation March 11, 2019 REEP Committee Meeting Agenda Packet- Page 4 of 18 Page 3 of 11 COLLECTION SYSTEM OPERATIONS RECYCLED WATER USE Paul A. Seitz y Division Manager Collection System Operations Division March 11, 2019 a OBJECTIVE OF PRESENTATION • Determine if the District should switch to using Recycled Water for HydroVac cleaning operations 1 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 5 of 18 Page 4 of 11 BACKGROUND Sewer Lines that are impacted by Fats, Oils and Grease (FOG), grit, and debris are cleaned by our HydroVacs. Hydro Vacs use water to propel the cleaning tool to the end of the sewer line. The cleaning tool is then pulled back with the water on to clean the sewer line. FOG, grit, and debris is then vacuumed out of the downstream manhole. I3 RECYCLED WATER EXISTING PRACTICES The Hydro Workgroup currently uses as much recycled water as possible when cleaning in Martinez, Pleasant Hill and San Ramon. It is estimated that for CY 2017 the hydro workgroup used a total of 400,000 gallons of recycled water for cleaning operations. This represents 7% of the water used on an annual basis. Currently, the Hydro group potentially uses 22,500 gallons/day of water. This equates to 5,850,000 gallons of water used/year. CSO pays for DSRSD ReW when used. CSO does not pay CentralSan when using our ReW. .F 2 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 6 of 18 Page 5 of 11 OPTIONS FOR RECYCLED WATER USE Option 1 — Rent equipment and hire a contractor to fill ReW tank at CSO Option 2 — Buy equipment and hire a contractor to fill ReW tank at CSO Option 3 — Buy equipment and have CSO personnel fill ReW tank at CSO Option 4 — Buy equipment and have CSO personnel fill ReW tank at CSO. ReW for first trip leaving CSO S.F 1- r, ';` _•ate-.. _ 5 OPTION 1 — RENT EQUIPMENT AND HIRE CONTRACTOR TO FILL REW TANK Cost to rent Water Tank, Trash Pump and Miscellaneous Fittings - $38,000 per year Water Truck Rental per year - $56,000 Water Truck Operator at $95/hour; 40 hours /week - $182,000 per year Fuel for Water Truck - $15,200 per year Fuel for Hydro return trips to CSO - $22,000 per year Potable Water Savings - $30,000 Annual Cost per year - $283,200 16 3 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 7 of 18 Page 6 of 11 OPTION 2 — BUY EQUIPMENT AND HIRE CONTRACTOR TO FILL REW TANK Cost to buy Water Tank, Trash Pump and Miscellaneous Fittings - $22,000 Water Truck Rental per year - $56,000 Water Truck Operator at $95/hour; 40 hours/week - $182,000 per year Fuel for Water Truck - $15,200 per year Fuel for Hydro return trips to CSO - $22,000 per year Potable Water Savings - $30,000 One time Capital Cost - $22,000 Annual Cost per year - $245,200 1 OPTION 3 — BUY EQUIPMENT AND HAVE UTILITY WORKER FILL REW TANK Cost to buy Water Tank, Trash Pump and Miscellaneous Fittings - $22,000 Cost to buy 4,000 gallon Water Truck — $125,000 Crew Member 2 to drive water truck, E Step, Class A DL - $85,100 per year (use existing staff - $0) Fuel for Water Truck - $15,200 per year Fuel for Hydro return trips to CSO - $22,000 per year Potable Water Savings - $30,000 One time Capital costs - $147,000 Ongoing Annual costs - $7,200 I $ 4 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 8 of 18 Page 7 of 11 OPTION 4 — BUY EQUIPMENT AND HAVE UTILITY WORKER FILL REW TANK — REW FOR FIRST TRIP ONLY • Cost to buy Water Tank, Trash Pump and Miscellaneous Fittings - $22,000 • Cost to buy 4,000 gallon Water Truck - $125,000 • Crew Member 2 to drive water truck, E Step, Class A DL - $85,100 per year (use existing staff - $0) • Fuel for Water Truck at 2 trips/day - $6,100 per year • Potable Water Savings - $10,000 • One time Capital costs - $147,000 • Ongoing Annual costs - $0 (the Potable Water Savings offsets the fuel costs) 1 9 TRAVEL TIME FOR TRIPS TO CSO TO FILL WITH REW — OPTIONS 1 , 21 AND 3 • Givens • Hydro trucks can clean 2-3 sewer lines per tank. • Hydro trucks use 3 tanks/day • Therefore there will be 2 additional trips per day per Hydro truck to CSO • Assumptions • Average Trip time to return to CSO — 20 minutes • Average time at CSO filling with ReW — 15 minutes • Average Trip time to return to jobsite — 20 minutes • Time not used filling at hydrant— (10 minutes) • Net Total time (CSO, fill, jobsite) — 45 minutes 5 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 9 of 18 Page 8 of 11 ADDITIONAL FUEL FOR TRIPS TO CSO TO FILL WITH REW - OPTIONS 1 , 2 AND 3 • Water Truck to fill tank at CSO • From CSO to the Truck Fill Station is 10 miles (20 miles/trip) • There will be 5 trips/day, therefore 100 miles/day • This equates to 500 miles/week and 26,000 miles/year • Mfg suggests 6 miles/gallon which equals 4,333 gallons of fuel • Diesel is currently $3.50/gallon times 4,333 gallons is $15,200 per year • If Water Truck only made 2 trips/day (Option 4) we would use 1,733 gallons of fuel for a cost of$6,100 per year ADDITIONAL FUEL FOR TRIPS TO CSO TO FILL WITH REW - OPTIONS 1 , 2 AND 3 • Hydro Trucks • From the jobsite to CSO is approx. 5 miles (10 miles/trip) • There are 6 hydro trucks so there will be 12 trips/day, therefore 120 miles/day. • This equates to 600 miles/week or 31,200 miles/year • Mfg. suggests 5 miles/gallon which equals 6,240 gallons of fuel/year • Diesel is currently $3.50/gallon times 6,240 gallons is $22,000 per year 6 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 10 of 18 Page 9 of 11 INEFFICIENCIES - OPTIONS 1 , 2 AND 3 • Each trip back to CSO to fill and return to the worksite takes 45 minutes. • Each crew will fill at CSO 2 times/day which equals 1-1/2 hours/crew. • There are 8-1/2 working hours per day minus 1/2-hour for morning preparation, 1/2-hour for lunch, two 1/4-hour breaks and 1/2-hour for cleanup and wellness. • Therefore, there are 6-1/2 working hours/day. • 1-1/2 hours to fill divided by 6-1/2 working hours equates to a 23% inefficiency from current practices for the Hydro group. • As an example the Hydro group has 688 lines to clean in December 2018. A 23% inefficiency would equate to 158 lines on a monthly basis not cleaned per their preventative maintenance schedules. • On an annual basis approximately 1,898 sewer lines (approx. 107 miles)would not be cleaned per their preventative maintenance schedule. Based on cleaning 800 miles/year this would equate to 13% of our sewer lines not being cleaned on their preventative maintenance schedule. zVL13 BENEFITS • Potentially save 5,850,000 gallons of potable water/year • Promote "Green Operations" for cleaning sewer lines 14 7 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 11 of 18 Page 10 of 11 FINAL TAKEAWAYS Reduce the District's dependence on potable water use This would prepare the District for drought years in the event potable water is not available Potential to reduce the amount of scheduled maintenance being completed — possible increase in sanitary sewer overflows (SSO) — Options 1, 2, and 3 Increase in diesel fuel usage by 10,500 gallons/year (hydro and water truck) - $36,750 — Options 1, 2, and 3 Additional maintenance on Hydro Trucks — Options 1, 2, and 3 STAFF RECOMMENDATIONS Use Option 4 This would eliminate inefficiencies incurred by Options 1, 2, and 3 Save $22,000/year in fuel for hydros (approx. 6,240 gallons/year) incurred by Options 1, 2, and 3 CSO would use 7,500 gallons per day of Recycled Water (1,950,000 gallons/year) and continue to use ReW when working in San Ramon, Pleasant Hill and Martinez (400,000 gallons/year) This 7,500 gallons used per days is a 33% usage and the additional 400,000 gallons per year attributes an additional 7% usage. This would equate to 40% of ReW used in cleaning operations. ' 16 8 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 12 of 18 Page 11 of 11 QUESTIONS / NEXT STEPS -�; 9 March 11, 2019 REEP Committee Meeting Agenda Packet- Page 13 of 18