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3. Wastewater Modeling/Impact Fees2011 sc Avenue East PO Box 1997 Kalispell, MT 59903 Phone: 406-758-7720 Fax: 406-758-7831 www.kalispell.com 1public_works To: Doug Russell, City Manager " From: Susie Turner, P.E. Public Works Director/City Engineer' Date: 2/5/2014 Re: Work Session Presentation for Sewer Alternatives and Impact Fees The workshop presentation is a continuation of the workshop from January 27 of this year. Since the last presentation, Public Works developed and evaluated responses to questions and inquires posed by Council. The presentation will provide a short review of: • Current ERUs that would be served by the Westside Interceptor • System peak flows vs. average flows • In -line sewage storage to reduce peak flows • WWTP water quality discharge concerns • Current vs. proposed cost per ERU comparisons for commercial development Enclosed handouts to Council include: • Bullet discussion summary points — Outlining discussion topics to be detailed further at the Work Session 2/5/2014 TRUNK LLN SANIT R�Y E- SL7C R CAPACITY/ OPTIONS (CON TINUED) ,i c �s OW MANY E'RUJ-5 WILL, COME OFF/ Of LINE `?" Existing Flows • Mountain Vista 136 ERUs • Spring Creek 71 ERUs • Aspen Creek 11 ERUs • Diamond Ridge 7 ERUs • Blue Heron 47 ERUs • Cottonwood 49 ERUs • Empire Estates 223 ERUs SUBTOTAL 544 ERUs Total Relief • 544 +228 = 772 ERUs Allocated Flows • Mountain Vista 29 ERUs • Spring Creek 105 ERUs • Aspen Creek 69 ERUs • Diamond Ridge 19 ERUs • Blue Heron 3 ERUs • Empire Estates 3 ERUs SUBTOTAL 228 ERUs 1 2/5/2014 Available Growth = TOER Us f1th Alley West and 5th Street 18" Vitrified Clay Pipe Remaining Capacity Calculation Design Capacity = 2,302 ERUs Current Flow = -1,390 ERUs Development North = -556 ERUs -332 ERUs New Allocations = -14 ERUs Available Growth = 10 ERUs Reduced Flow= 544 ERUs 228 ERUs Available Growth = 782 ERUs 2 2/5/2014 Q,2-. "LOW FLOW'VS PEAK FLOW Tjm '#?�» 1 New... • Delete Rename Name rL J.. L_ DIU. Residential -Single Family DIU 10 - Commercial - Hotel Commercial - Office 5 Commercial - Retail Commercial -Entertainment 0 Industrial - Light 5 10 15 20 Industrial - Heavy ...----------------------._----------------------- Reddential•SmgOFamily 0.9Q7512467.17.56.35.13.93.63.43.54.35.57.288.47.56.24.83.11.31 Residential - Multi family Misr - Educational Institute Misc - Casino Misc - Sports Stadium OK Line A- Measured Flows at Liberty and Meridian Bottleneck inn, I G .N 200 gpm 3 2/5/2014 Grandview Lift Station - Jan 29 - Pumped Volumes By Hour ]6]aJ 19,630 18.595 a'=09M 1$ffi9 IA90] 1T,A68 36,1a54.Qbf1 t�-15,65] 15E6P ]4,S3b "i�63) 1a0W / 17.3a5 ! 1�X53 tn�ao � u 3a IA92 E lmx� € as2b 6,93a ,zaz i•13 �A34 4'z'lo n 3,791 ,P]2 1 ] 3 4 5 6 7 a 9 19 11 12 13 14 15 16 1] 18 ]9 29 PI ]P 23 24 Hain mare o" El 2/5/2014 Keeping our Great Lake great. I -low hotel drainage works to protect Doan Brook and Lake Erie `.\ \ `�•� The Courtyard ny Marriott and RE parking lot were designed \ to protect Uur local waterways by reducing the anoint —TEL ROOF of water entering the ..— £y.t... \ Ho d— that work? The Northco£t Onl. ' I Regional Sewer Dlstnrt e><plolns It this way. 91 Narrmil � t 'I PERVIOUS PARKINS LOT TREAT • 0.EAN 8 01,1 mil�l•,nfes £Blvrrxn alhlw nmlulf In RRk if-4, alJ Inin Intl weanJln4 mills. \ , MAYFIELD ROAD DOAN BROOK+. I INFILTRATION eWprf R+�sd xcw.a.. rzulemil6—wMr.l+e WMOWEDSEWER.— wilxecmez tWee9 a5M�4ceb cyelvnuMaC—MP rRT4 a{z:�mbas, �CpMSWED SEWER OVERFLOW �J Bur„ Y �.ole••,+el u,� a'IIl+aarpYl ,ae.,aenr R.<arr «mares, •xwer ptreiryl bil Mtsan small wMar tar+in aua3alzx _ _ Imm acvm.s xnu sykwl+lozra vekrnuy. Northeast Ohio nWmEn®wl.a.rana.�..a.a,l+:,. InM1ttretgn r@Jt-,,,iM 9 cim 9lOrrnvr — h if10 � Regional SewerDistrtet �nmx�.,�deevacm�.«nvr��b�Ea„rrw•.narow,n;mo,...--------.._.....i Q.3 v ciC N WE -'TORETHE P _ e Kof 5 2/5/2014 Q31 4 "'CAN MWE STORE THE P M" Heav��1 Rain flewssem to j ', Leatmrnt I Fa3Rllq —Nermal Fbws Iq II fxnbined Sewn Storage rank boldstlows Me3AaniraL uMi opauty navabblein eantinquwer EiMnlcal, and Odor (ontlel II lquipmenl II Pumpsem;ny tank after'. ' Wgfainfa9! 1 . �7 Q,20, cc2 ��1 R FLO 76S R ATE O �}i Grandview Lift Station - Jan 29 - Pumped Volumes By Hour ".X 19b30 ]8,59G µ'=0.9156 18,189 JBOCO t);d68 1 ]GOOD 15,651 35,fiW 61') 14(ttq 11�'n6 12l , E i ilbDD n 8000 6,)92 5,938 1Aa10 a SA9 Jllln I'm 3,9i66G 1CUD 4 t 2 3 4 1 6 I B j le ]3 12 13 14 16 16 17 16 19 Yn 23 22 23 Moue ollhe Day 1.1 2/5/2014 v CAN WE STOREE. Tit(E--,-/, PEAK? ,. • •ice.• � • oC" i{r r� 7 2/5/2014 Grandview sift Station- Jan 29 -Pumped Volumes By Hour 160N _19b3p.. 16,596 A� = m9156 38.169 16@'b 1%46B 1C�U S,fiSi 15,66] 14" 12,345 E i "UV 3 ea0b 348 5,938 ' 6281 bOflp \ 4� \ /bA34 ' 3.]91 3,99$ ,zn 1 2 3 4 5 6 2 8 9 1p 11 12 13 14 15 16 17 IS 19 20 21 22 23 2 —a 1. pay o ggCAN W TORE J�/ IE, SPEAK?111J Summary • Technically speaking, peak flows can be stored. • Most of the information we have found for this type of flow equalization is for combined sewer systems in coastal or great lake cities. • The storage facility would be significant in size, needing to be constructed north of Grandview Lift Station. • MDEQ has requirements in Chapter 65 of Circular 2 regarding flow equalization. • Construction of a flow equalization facility would also require the construction of pretreatment devices such as: • Bar Screens • Grit Chambers • Aeration • Mixing • Odor Control • Due to these DEQ requirements, several items would need to be constructed above the ground surface. • The facility would need to be sized and phased to account for growth, not just current flows. 0 Water Qualifr Concerns Treatment Capability DEQ Permit Restrictions '. • 5.4 MGD • Concentration and Pounds Limits 1 Current flows 2.5- 2.8 MGD — Average monthly • Treatment Parameters Monthly Parameters Limits — Phosphorus - - Phosphorus: 1 mg/I or 25.8lb/day —Nitrogen Nitrogen: 10 mg/I or 286 lb/day — Ammonia — Ammonia: 2.16 mg/I winter / 1.23 sum BOD - BOD:10 mg/I or 259 lb/day TSS —TSS: 10 mg/I or 259 lb/day — Pathogens (E-coli, fecal) — Pathogens: 630cfu winter/126cfu sum — Dissolved Oxygen — Dissolved Oxygen: >75% Saturation Proposed Current 2013 Minimum Maximum Average permit Limit Numeric TMDL Standards 2/5/2014 Numeric Water Quality Standards Phosphorus 0.07 mg/L 0.23 mg/L 0.096 mg/L 1 mg/L .025 mg/L Nitrogen' 5.35 mg/L 7.89 mg/L 6.66 mg/L 286 Ib/day 0.275 mg/L (125lb/day) (184lb/day) (156lb/day) (6.42lb/day) 1. lb/day calculation uses 2.8 MGD • Implemented by permit — Variance: For facilities > 1 million gallons per day — Nutrient Limits per Permit Cycle 3 permit • A. By 2016 : 10 mg TN/L, 1.0 mg TP/L cycles or • B. Next permit cycle (5 year later): 8 mg TN/L, 0.8 mg TP/L 15 years 4 permit • C. Next permit cycle (5 years later): 8 mg TN/L, 0.35 mg TP/L cycles or • D. Next permit cycle (5 years later): 5 mg TN/L, 0.15 mg TP/L 20 years — Optimization Study TMDL Status • Preliminary Modeling Complete — Date input and sampling complete — Reviewing setup and calibration — Internal QA (EPA, State) — Model Report — External Review Preliminary Results-% Breakouts r6 3 C C Q N rip Potnl d) s_ Souro Q 3% Unpave Roads Timber Harvest I% 2% Total Nitrogen Total Phosphorus Timber Unpaved Urban eank(Blufl Forest Harvest. Roads 5 PU s Erosion Fire 2% \ 3%_ ,,,�% / 2% _ _5% So Fr 2 2 2/5/2014 Commercial Examples Current vs Proposed Commercial Examples 2011.2013 ERU Treatment Collection Current $/ERU 1427 Proposed $/ERU 2,008 Difference $/ERU 582 Current $/ERU 1073 Proposed $/ERU 3 749 Difference $/ERU 2,677 Residential Unit 1 1427 2,008 - 582.. 1073 3,749 1 2,677 En sneering Firm 0.46 656 924 267 -. 493 1725 1 1231 Office Buildin OJ6 1084 1526 442 815 2 849 2 034 Pub 1.861 2,655 3,737 1082 1996 6 977 4.981 Baker 0.503 718 1010 292' 539 1886 1346 Sub Sho 1.132 1 615 2,273 658 1,214 4,244 3,030 Apartments 31 44,222 62,248 '18027. 33 248 116 219 82 972 Salon 1.5 2,140 3,012 872 1,609 5 624 4,015 Breese 4.381 6,249 8,797 is 2,548 4 699 16 424 11726 Hos ital Facilit 16.465 23,487 33,062 ' 9 574. 17,659 61 727 44,069 Colle a Facilit 6.482 9,247 13,016 3,769 6,952 24.301 17,349 Military Facilit 11 15692 22088 r6 97-: 11798 41239 1 29442 Small-Hote1 29.51 42,096 59 256 17160 - 31,649 110,633 78,984 Large -Hotel 52.124 74,355 304 665 1 30.310 - 55,903 195,413 139,510 Fast Food Restaurant 1.596 2,277 3,205 928 1,712 5,983 4,272 Sit Down Restaurant 4.755 6,783 9,548 2,765 ` 5 100 17,826 12,727 Fast Food Restaurant 3.018 4,305 6,060 ..' 2,755 3,237 11,314 8,078 Super Center 18.065 25,770 36275 10,505 19 375 67,726 48,351 Sit Down Restaurant 5.221 7448 10494 3036.-. 5600 19574 13974 Fast Food Restaurant 2,214 3,158 4,446 1287 2 375 8 300 5,926 Sportin Goods Store 2.578 3,678 5,177 1,499 2 765 9 666 6 900 Total Current $/ERU 2,499 Proposed $/ERU 5,757 Difference $/ERU 3,258 2,499 5,757 3,258 1,150 2,648 1499 1899 4,375 2,476 4,651 10,714 6,063 2,257 2,896 1639 2,829 6.517 3 688 77,469 178,467 100 998 3,749 8,636 4 887 10,948 25,221 14,273 41,146 94,789 53,643 16199 37,317 21,118 27,489 63,327 35,838 73,745 169,889 1 96144 00 078 169,820 9188 5.200 7 375 15492 7 75 9 83304000 W883 58 8560057 170102 746 7 2134.2 6,399 2/5/2014 1 - Impact Fees • With direction from council, bring the impact fees to a regular meeting for possible adoption. 2 - Request for Proposals (RFPs) • Upon approval of impact fees with direction from Council, Public Works will send out RFPs to qualified engineering firms for planning and design of the West Side Interceptor. 3 - Other Direction(s) • Other direction by Council? 1