Case Study: Str e amlining I/ I Re pair s in Be r lin Char te - PDF document

4/19/2013 Case Study: Str e amlining I/ I Re pair s in Be r lin Char te r T ownship Pr e se nte d by: Ric h Gr ant, PE Age nda  Disc ussion of the pr oble ms & “the SAW”  I/ I E S = Asse t Manage me nt valuation & SSE  Gr oundtr uthing of Re sults  Ove r all Re sult - $$ Savings for the T wp  L e ssons L e ar ne d / Ke y Re c omme ndations  Que stions 1

4/19/2013 Ke y Points  Colle c tion Syste m I/ I = Ve r y E xpe nsive  Mass F low Monitor ing: Save s Mone y -What we did that’s ne w vs. tr aditional data c olle c tion -$$OldWay (flow me te r V) …Ne w way ing many e ve nts, BigCCT  Highly T ar ge te d Constr uc tion save s mone y T he Pr oble ms – At a Glanc e  Colle c tion Syste m Asse ts: wate r fille d  Ne w pe r mit limits: De c e mbe r 2007  Pr ior to De c . 2007, ammonia was r e por t only  Ne w limits we r e har d to c onsiste ntly ac hie ve  May-Se pt – 1.4 mg/ L  Oc t-Nov – 5.1 mg/ L 2

4/19/2013 Imme diate NPDE S Pe r mit Re qs NPDES Permit Issued December 2007 New Ammonia Nitrogen Limit ‐ WWTP not designed for NH3 treatment ‐ Exceedences occurred immediately w permit ‐ Capacity of this asset immediately impacted Clean cold water interferes with NH3 treatment Upc oming NPDE S Pe r mit Re qs MDEQ draft; revised September 20, 2012 Operation, Maintenance & Replacement / Asset Management Part 1.A.X(a number). The permittee shall at all times properly operate and maintain all facilities (i.e. sewer system, treatment works, as defined in Part 41 of Act 451, 1994 as amended, and control systems) which are installed or used by the permittee to operate the treatment works and sewer system and achieve and maintain compliance with the conditions of this permit (also see Part II.D.3 of this permit). The requirements of an asset management program listed below contain goals of effective performance, adequate funding, and adequate operator staffing and training. Asset management is a planning process that ensures gaining optimum value for each asset and providing the financial resources to rehabilitate and replace them when necessary; and typically includes five core elements which identify: the current state of the asset, the desired level of service (e.g., per the permit, or for the customer), the most critical asset(s) to sustain performance, the best life cycle cost, and the long term funding strategy to sustain service and performance. The permittee shall comply with the following Operation, Maintenance and Replacement (OM&R)/Asset Management program requirements (the permittee can choose to include the Operation and Maintenance Manual required under Part II.C.14 of this permit as part of this program): a. Maintenance Staff. The permittee shall provide an adequate staff to carry out the operation, maintenance, repair, and testing functions required to ensure compliance with the terms and conditions of this permit. The level of staffing needed shall be determined taking into account the work involved in operating the sewer system and treatment works, planning for and conducting maintenance, and complying with this permit. b. Collection System Map. Within __ months of the effective date of the permit, the permittee shall complete a map of the sewer collection system it owns and operates. The map shall be of sufficient detail and at a scale to allow easy interpretation. The collection system information shown on the map shall be based on current conditions and shall be kept up to date and available for review by the Department. Such map(s) shall include, but not be limited to the following: 1) All sanitary sewer lines and related manholes; 2) All combined sewer lines, related manholes, catch basins and CSO regulators; 3) All known or suspected connections between the sanitary sewer or combined sewer and storm drain systems; 4) All outfalls, including the treatment plant outfall(s), combined sewer treatment facility outfalls (RTBs), untreated CSOs, and any known SSOs; 5) All pump stations and force mains; 6) The wastewater treatment facility(ies), including all treatment process; 7) All surface waters (labeled); 8) Other major appurtenances such as invested siphons and air release valves; 9) A numbering system which uniquely identifies manholes, catch basins, overflow points, regulators and outfalls; 10) The scale and a north arrow; and 11) The pipe diameter, date of installation, type of material, distance between manholes, and the direction of flow. 12) The manhole interior material, GPS coordinates (optional), rim elevation, and invert elevations. c . Inventory and assessment of fixed assets . Within __ months of the effective date of this permit, the permittee shall complete an inventory and assessment of operations ‐ related fixed assets. Fixed assets are assets that are normally stationary, for example pumps, blowers, and buildings. The inventory and assessment shall be based on current conditions and shall be kept up ‐ to ‐ date and available for review by the Department. The inventory shall include the following information: 3

4/19/2013 T he Pr oble ms – At a Glanc e  High F lows of Cle an Wate r Re c e ive d at WWT F  E ve r y spr ing  Dur ing he avy r ain e ve nts  Both infiltr ation and inflow suspe c te d Berlin Township WWTF Influent Flows and Precipitation 2007 ‐ 2010 3.000 4.0 5.144 mgd 3.5 2.500 Inflow 3.0 2.000 2.5 Precipitation, inches Flow, MGD 1.500 2.0 Infiltration 1.5 1.000 1.0 0.500 0.5 0.000 0.0 1/1/2007 7/20/2007 2/5/2008 8/23/2008 3/11/2009 9/27/2009 4/15/2010 11/1/2010 Date precipitation Influent Flows Dry Sewage, est 4

4/19/2013 T he Pr oble ms – At a Glanc e  High flows r e sulte d in:  Ope r ational c halle nge s at the WWT P  T SS % r e moval violation (F e b/ Mar / Apr 2009)  E fflue nt ammonia violations (spr ing 2009)  Ope r ations staff stor ing e xc e ss wate r in the c olle c tion syste m to pr e ve nt pe r mit violations  Sanitar y Se we r Ove r flow (Mar c h 2009) I/ I E valuation – Analytic al Re vie w  SRF Guide line s: “dr y se wage ” is 70 gpc d  T ownship has 3,600 se we r c ustome r s, or appr ox. 4,200 e quivale nt pe ople  Dr y se wage should be ar ound 0.29 mgd  Annual avg. flow was 0.66 mgd (2007-2010)  0.84 mgd avg Mar / Apr / May = 201 gpc d, highe r than 120 gpc d thus “e xc e ssive ” infiltr ation/ inflow  1.5 to 2.0 mgd was not unusual 5

4/19/2013 Se we r Syste m E valuation Sur ve y  Analytic al r e vie w indic ate d both infiltr ation and inflow … but ove r flows we r e at L illy Patc h  Pur pose of SSE S: ide ntify spe c ific sour c e s of infiltr ation & inflow Total Wastewater Flow: St Charles Plus Lilly Patch Lift Stations 3.500 3.000 Wastewater Flow (MGD) 2.500 2.000 1.500 1.000 0.500 ‐ 3/7/2011 3/21/2011 4/4/2011 4/18/2011 5/2/2011 5/16/2011 St Charles Lilly Patch WWTP Influent SSE S Se tup / Appr oac h  Re lative ly lar ge c olle c tion syste m for the numbe r of se we r use r s (22.5 mile s)  Many smalle r se we r s fe e ding two main tr unk se we r s into the WWT P  Ne e de d: c ost e ffe c tive way to do SSE S 6

4/19/2013  T he “old way” of c olle c ting SSE S Data  “He y, ya wanna be on my stor m te am? SSE S Se tup / Appr oac h SSE S Se tup / Appr oac h  “Mass F low Monitor ing”  Ine xpe nsive – r e ntal was $4/ day pe r “F lostic k”  E asy installation – no c onfine d spac e e ntr y  Many data c olle c tions loc ations I mage c o urtesy o f F lo Cis Co rp. 7

4/19/2013 SSE S Se tup / Appr oac h  Install the “mass monitor ” se nsor s in ke y manhole s in the syste m  Data Colle c te d  Waste wate r te mpe r atur e  Wate r de pth  Re lative ve loc ity (“wiggle -waggle ”)  Ne ar c ontinuous data c olle c tion  Data c olle c te d e ve r y 5 minute s at e ac h of 38 loc ations for 9 we e ks We st Distr ic t – divide d into 13 subdistr ic ts 8

4/19/2013 SSE S Se tup / Appr oac h  E ast Distr ic t - divide d into 3 subdistr ic ts SSE S Re sults  “Mass monitor ing” allowe d us to pinpoint whic h subdistr ic ts we r e c ontr ibuting I/ I  Knowing se we r diame te r , slope , and de pth of wate r allowe d us to e stimate flow r ate s  Pump station flows we r e e stimate d using pump r un time to he lp c alibr ate flow r ate e stimate 9

4/19/2013 E xample Inflow Re sult  F loStic k #26, inflow indic ate d by inc r e asing de pth c or r e spond to de c r e ase d te mpe r atur e Rainfall Water Temp Depth E xample Infiltr ation Re sult  F loStic k #12, de pths r e main high for a while afte r r ain e ve nt and te mpe r atur e s ar e r e lative ly stable Rainfall Water Temp Depth 10

4/19/2013 SSE S – Summar y of Re sults  Most of the flow is c oming fr om the We st Distr ic t  Confir me d that the E ast Distr ic t pr e viously line d, only c ontr ibute d minimal inflow, not muc h infiltr ation SSE S – Summar y of Re sults  Confir me d sur c har ging of the main tr unk se we r dur ing lar ge r r ain e ve nts as ope r ator use s c olle c tion syste m for stor age to ke e p WWT P in c omplianc e  SSO in manhole in E ast Distr ic t was due to a “hydr aulic r oadbloc k”  Pr ior itize d ke y se gme nts for impr ove me nts 11