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Home My Public Portal AboutSAC SWMP Updates 012022Stormwater Advisory Committee Presentation January 20, 2022 6 "Minimum Control Measures" 1. Public Education 2. Public Involvement 3. Illicit Discharge Detection &Elimination (IDDE) 4. Construction Runoff Control 5. Post -construction Stormwater Management 6. Pollution Prevention Plus TMDL requirements (including Charles River Phosphorus Control Plan) • Plan finalized in July 2019 • Minor updates were made in September 2020 • To be updated this permit year ' Reference additional documents that were prepared • Reference completed tasks https://www.watertowndpw.org/162/NPDES-Program Year 3 Activities Town Manager newsletter Press releases (CB cleaning) Website updates 41 Separate page for educational materials 41 Additional information about Green Infrastructure ' Use of social media ' Fifth grade educational program (MyRWA) • Stormwater permitting packet sent to 100 developers, contractors and engineers what Is A Rain Garden? n rain gartlan Is grtgned to rapture antl filer rain water that flows eN M1ara suNares like roadways, grlueways, parking Iqs and rooftops. Asballow basin is plarRdd with deep-rooted native wiltlnowers, grasses aM sbrvbs tnd't lll� aM abab mwd[Es runoff and Ne pollutants R Wriss- �M1[Ir ea'tensi�e rv61 sysuems Inter stmmwater runoff try remeving nutrients, 5¢dlm¢nts and poll manes belae It enlace our govntlwater and waterways. why Plant Natives? In addalan to helping to prey -ant wmbm and imp—og water quality, native plantk P—da eaential food.. nabitat for I 1 wP Ue. Thal' seeds and nadar provide a —ble 10nd ce tar blyds, butt nand ul insects as well as a place t0lay thktir eggs- Natives are well adapted to local very mMifrons, requira y IINIe rare ando they are estabi mad, and add betuty M the landscape MEN How Can You Help? • Rake and remove leaves arrd tlebrls tram tM1e sunet in (�v��rtyour lxree. �' W • after mowing, sweep vp grass elippings from streets. dnvewdya and sidewdlk5. en your goner eewrepwu • from tlnveways or alleys onto Wwn er gatlen areas. • %ck up pet wale. . opus Rn+�^9 dwwrastmnalk f< HOUSEHOLD WASTEWATER F. SANITARY STORM SEWER DRAIN CATCH BASIN TREATMENT WATERWAY PLANT https://www.watertowndpw.org/181/Illicit-Discharge-Detection-Elimination- Year 3 Activities Continued manhole testing in priority outfall areas (6, 8, 11, 18, 20, 99, 109, and 6 E L) Additional investigations in outfall areas 9, 31, 34, 35, 36, 37 and 38 Building inspections continued to be on hold during Permit Year 3, but have resumed in Permit Year 4 7t 5+ e a , �r REPLACtE CR LEMER AT STA 1497 ■ITH Oiyi ,r:_ 12' PNC sn w;_ a�lao.a r rxdh4e�c�ua7r 1t1ee] p nr+dr{e�}-ce�l � � hrr�a�r�rrsc�� •: hrrdour�3^el�a � 7 RMUVE R' MC OWN CVMIfYMEAM OF suH I i-�10e _— I. 1. _ —,1. I•— — 120 . REPVLL M LEAM AT CORE 12' RE FIFE AND STA 14-72 HRH 12- F1rY' v.�l •� I--zTa LL RJ5 -5 TEE Tv COYyE:T T: G61H 11C-1Sq wn I}' VK REPLACE EXEMIC +' K OF*M +ICE +T SA P+_23 wrrH V P•C hVJ I:D%IN= 76 EIITRxr.` 6' PIAk AT I-AH l i o—, So. tti MMIrm � ui SHALL FEAFORH 'PUSH CJW9W OR 77, IMPS fF��4F 9Rhlx Rupuoa-94 T7 El itai dl•R-1 S, P,1C �a1.27 fsu�1 } REPWE DW I II, , IYR L44P R1L4-1 MM FN.(H-1�17#.36 . _ p-cr4-2r,17go— {e�u�,I,g •a H,'�OLIT�1125b #b m i ERE3UQE CH LDUM aT STa 3+P7 ATM il17 I — _nt Fk r` L ROE DRM RiMrIGE CS LEA O {1L4i1WM Ar VA AT STA 3+97 MTM I-M ■ITH W PrC 1#' PM REPLACE CYH wg Iryw-1OST4 144150 ?E'L4nE DISTI+Y.• NW4 NM 1.- 3'E+I W 41H-2]-10,.30 -&wm ?Eipmcm CChcf= PIKE. ME )'A% T:MJCH EETaL Ch 3-1. IHV�dJT}� I RO.F4; 52'� WATERTOWN Oept,l—t of pd5lic works I rA Vol I r�j.Yar Ra �gr. 1 2021/2022 Sewer and Drain Project ' Lining of a sewer lateral on Philips Street (Outfall 12) that was found to be communicating with the drain. Inspections of sewer and drain in an easement near Porter Street that is thought to be experienced cross - communication (Outfall 20). • Additional investigations and sewer lateral lining on a section of Oakley Road experiencing cross - communication (Outfall 20). • Lining of a section of drain on Highland Ave. near Gilbert Street that has experienced cross -connection with the sewer (Outfall 8). old Sr - # '`f' f" - --s" ,1./{2QY.=832,_d 9El' f �3awo- 1 • - - -' 1 d � At v LA wo ! lIH-S-4 J J: 3�ea3= 1q A-, �l l l r 4 11a�i-'7•_ !la 3'7 -n-,EPAL -15, 'may `F •'� - 0 WATERTOWN NN'r—r of ftbli, works - Y- ^ S f � J Construction Site Impacts and Erosion and Sediment Control Requirements e tertown T orn4r udic arks e ad about this tuwn. " Watertown Departmert of Public Works 124Orchard Street Watertown. MA 02472 TeL 617-872-6420 WATERTOWN Oeponmem ojN�6lic works Complete Streets/Green Streets ' 19 Stormwater Tree Trenches 8 drywells ' 2 drywells installed by DCR on behalf of City Almost 6 lbs/yr phosphorus removal Stormwater Rules and Regulations Update ' Formalized phosphorus removal requirements ' Added erosion and sediment control standards ' Clarified off -site mitigation procedures ' Clarified regulations for simplified permits ' Reduced requirements for small residential driveways and additions ' Added phosphorus removal requirements for parking lot reconstruction projects _ Stormwater Rules and Regulations Update ' Document promulgated September 2021 (Permit Year 4) ' Written Stormwater Permit ' Written Certificate of Compliance Year 3 Activities Implementation of SWPPPs Standard Operating Procedures Continue developing catch basin optimization plan mow• h Y Year 3 Activities 9 All catch basins cleaned in late Fall 2020 Rebid catch basin cleaning contract Completed catch basin optimization plan Cleaning data entered into GIS Supplemental fall cleanings (about 600 catch basins) going forward All catch basins cleaned in spring going forward Additional permit requirements for discharges to the Charles River (Total Maximum Daily Loads (TMDLs) for phosphorus and bacteria) Phase 1 of the Written Phosphorus Control Plan (PCP) must be in place by June 30, 2023 Watertown must reduce current phosphorus loading to the Charles River by 1,550 Ibs/yr over a 15-year period to meet Waste Load Allocation (WLA) under the TMDL Implementation Schedule 15-year implementation schedule beginning at the end of Permit Year 5 Reduction Credits 0 Estimated current credits for current catch basin cleaning, street sweeping • Estimated proposed credits for enhanced leaf litter pick-up • Evaluated feasibility of enhanced catch basin cleaning and street sweeping Continued analyzing existing and proposed development projects for credits Phosphorus Reduction from Structural BMPs Analyzed 26 private developments & 51 municipal parcels/right-of-way improvements EPA BATT Tool used for phosphorus removal calculations. Inputs include: BMP Type Area Treated by BMP (land use, impervious coverage) Design Storage Volume Phosphorus Reduction from Non -Structural BMPs 9 Evaluated current maintenance practices Best case scenario: • All catch basins cleaned so no greater than 50%full (underway) • Increase fall leaf litter collection to weekly (underway) Phosphorus Reduction Summary 9 Evaluated current maintenance practices Phosphorus Reduction by Type P Tvn� I Phosphorus Removed (Ib/yr) ' June 30, 2026 Removal Requirement: 310 Ib/yr Deficit: 101.91b/yr June 30, 2038 Removal Requirement: 1,550 Ib/yr Deficit: 1,341.91b/yr Cost Analysis Evaluated P removal costs from recently completed green infrastructure projects $25,000 to $71,000 per pound of phosphorus removed ' Siting of green infrastructure continues to be a challenge in meeting P reduction requirements Uncertainties Credits for phosphorus removal due to illicit discharge repairs to be identified by EPA at a later date ' EPA is investigating increased credits for some non- structural practices, but any changes would not occur until a new permit is issued Redevelopment continues to occur and it is difficult to project additional credits due to land use change and private BMP installation Structural credits assume proper BMP maintenance Additional Activities Participated in Charles River Watershed Association grant to develop a Phosphorus Control Plan template • Worked with Planning on Municipal Vulnerability Program grant for green streets • Continued to monitor EPA Residual Designation Authority process .--� t, ! - . .' a• _ -_ram-�� _ �_- _ _ = .�L� � _ . � _. x rr1 y 4 h '+'pF�h }� �� • � � ��\ ,�wy ,�wF ri � � �'L r��/�� SS,�1��ti��, � � �, 4 ��u�j,�x, � ,A � +& ` ^' � Ik ",ems'' q1�, . � � �: ��r/! ti_ 7 '� � �/� �i r� yyti� �,� ' �'d 6��iy a Y� ¢-� �°.�� f } '. 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