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Home My WebLink About97.Oc Public Works PP Presentation 5222013.pdf Presented at Steering Committee or or J C_ �l iJ 3 a - 0"I � ,' Public orks .. JJ/ iJIIl11/J11/S�� JJ/ iJ111111/SIUY/N North Orange County f : r Urban Runoff Diversions Chris Crompton May 22 , 2013 Background OCSD began accepting diversions from storm drains as result of a settlement with the Regional Board (Newport Dunes drains) and in response to the 1999 Huntington Coast beach closures Orange County Stormwater TAC was actively engaged in discussing OCSD policy in 2004 and in formulating alternatives approaches for discussion with OCSD in 2006 TAC served to allocate the 4 MGD available , no charge capacity among Permittee projects 0°CPublicWorks OCSD Existing Diversion Policy (Resolution No. OCSD 2001 -0007) Diversions must have permits and are for dry weather flows Operation/Maintenance Costs (2009 : $ 1 , 192 . 56 per million gallons ; 2012 : $ 1 , 581 . 55) No charge for initial 4 MGD monthly average If 4 MGD is exceeded — charge for all , including initial 4 MGD Maximum diversion for urban runoff — 10 MGD °CPubiicWorks OCSD Existing Diversion Policy (Resolution No. OCSD 2001 -0007) WHEREAS, District intends to initially waive fees and charges associated with authorized discharges of dry weather urban runoff to the sewerage system, where such runoff originates within the District's service area, until such time as (1 ) the total volume of all dry weather urban runoff discharges to the sewerage system exceeds four (4) mgd calculated on a monthly average or (2) the District otherwise modifies its dry weather urban runoff policy.. . 6 Cost Based on 330 days of diversion c 4 L d 2 0 0 2 4 6 8 10 MGD Current Status 15 existing diversions (used by County, Huntington Beach and Newport Beach ) Additional 4 diversions by Irvine Company and IRWD Monthly average ranges from 0 . 3 — 3 .3 MGD with annual average 1 .6 MGD Program has resulted in measureable improvements in bacteria water quality rPubiicWorks Current Diversion Locations •CITYOF HB-SCENARIO • OCM SANTA ANA 'CITYOFH YORNTOWN • CITY OF BiDAMS • CITY OiFfBa N DIANA POLIS • CITY OF XB A,'ANTA •CITY OF 11 LANO • CIT 6ANNINC OITYOPN EMORTOUNES • IRVINE COMPANY. ICAN POINT IRWD-L ANCOS CANYON WD.MUDOY CANYON Current Diversion Quantities Orange County Sanitation District Dry Weather Urban Runoff Diversion Monthly Averages, gpd 4,000,000 2009 - 2012 3,5W.000 Annual Average: 1 .6 MGD 3,000,000 oe mS $ o 2,500,000 - m ry - o ov w 2,000,000 c 0 o m - a m v 1,500,000 - _ - m - oPo 1,000,000 - - 5W,000 m z - z w z - z m z -I to z - fn monthly averages Proposed Diversions Approved in 2006 — Few Implemented Proposed DNerston LOCaDODS Eshmatod Flow GPD Sceeana f0,00o City of HB, Implemented Shuck 10,Oo0 Slater 801,000 Scenario Marilyn 8,000 NNI 30.000 lst street 2'900 City of HB, 1st St Dify of NunNrtpton Beach 12(h soeet 5T,T00 CDS Implemented f2th Street 1,800 lath Street 8,200 Mh Street 8,800 22th Street 76,o0o Golsen West 15,000 Carnation Stormtlraln I5,000 Old Newport Stormtlraln 75,000 Dover 5rotm6nin 75,000 City of Newport Beach EI Paseo Stormtlraln 75,000 RnerslOe Stormtlraln 25,000 e2r0 St Stormtlraln 5,000 seashore M.W..draln BOO City o/Seal Mach West End Ptanp Station 20f,600 County, Seal Manna Drive Pvmp Station to," Beach PUMP City of Fotmtain Valley Walnut Pump Station 2,DDD Tentative County Of Orange Seal Beach Pvmp station T5,000 Station Total Esnmatea Flow GPD f,6)].000 Future Diversions Interest in diverting groundwater/surface water in the Newport Bay Watershed in response to TMDLs Proposed diversion volume 2 . 6-4 . 3 MGD Interest in additional water for the OCWD Groundwater Replenishment System , especially after expansion to 100 MGD 6cpPu iicWorks Future Diversions u V Sea Beach •_,CITY OF NB-SCENARIO Santa Ana - S to Fe CM4AHTAANA w Peters Canyon Lane 'CITY OF -YORKTOWN • CIT #DAMS 1 • CITY JNDIANAPOLIS•CITY OF NBATLANTA S to Ana - Delhi •CITY OF A LAND /^\ • CIT BANNING / \ Big on J/ � S OJCITY OFN NEWPORT DUNES RNX ECOMPANY- ICAX POINT Planned Future Diversions IRWD-L AN=DSGANYON _ WD.MDDOY CANYON O Planned Retirement of Current Diversions .. wY' lip Formations `mow SW --------------------- S rx �^� � K � ! s�+�v"tf�.n•�r T� � @� �� fir',. L: - a*'� •-, �� 1 Selenium inc ms LEGEND Newport Bay Watershed Selenium Concentrations the Channels - �15-25 uq/L 5-15 u9/L E•lE• . r SISuyL ed�Ummparea P1�, Qbt HiSbncal Swamp of me Frogs SS iy s� pyH h Qf j1F5 "l SWAMP O MEFRO o f �ti4 1 tT cti � i ry o��eh hyf q` W s lb �b c rvHMEt 09�( 2 c^s `prypnr�'�' `wC� �4 ii.jEYCis{� YYYM) Selenium in Groundwater a - fi Al 1 4 Watershed Selenium Loading Atm Dep,0.3% Open Space, 1.2% Ag,0.2% Nurseries.O.W. Sewere0 GW,8.3% GW ST Clean-up,0.2% Rising GW.66.1 GW LT Clean-up.2.50k --------- GW ST Dewatering,6.6°/u—___ GW LT Dewatering, Urban Runoff. 13.2'0 11uick-Start BMP Testing , 2005 ABMet Testing in 2009 and 2011 1 4 1 y � i f/ ti Sr. Status of Selenium Management Selenium is naturally occurring and associated with rising groundwater Since 2005 , $3 .6 million has been expended on pilot testing , monitoring , and management Effort on new treatment technology, source control , and special studies is ongoing An element with many forms , selenium is not amenable to traditional treatment Diversion remains the only viable option d°cPubiicWorks Future Newport Bay Selenium Diversions Projects Volume (MGD) Peters Canyon 1 . 1 - 1 .8 Santa Ana-Delhi 1 .4 Big Canyon 0. 1 Santa Ana - Santa 0 - 0.5 Fe Lane Channel 0 - 0.5 Subtotal 2.6 - 4.3* 3.0 MGD will be used for discussion purposes PublicWorks Overall Future Diversion Volumes Categories Flow (MGD) Existing Diversions 1 . 6* Diversions to be Taken Offline - 0 .4* Proposed Newport Bay Diversions 3 .0* Overall Future Diversions 4 .2* Range of Monthly Average 2.9 — 5.9 * Numbers are annual averages 'PublicWorks Modification of Diversion Policy Prefer Option 2 up to 10 MGD without treatment cost Support for Option 4 as alternative up to 6 MGD without treatment cost Support annual averaging of flows vs . monthly averaging dcki.biicWorks Option 4 . Cost Structure (longer term ) OCSD Urban Runoff Diversion Cost Schedule (Treatment Cost $1,581 .551MG) 6 Current Cost Per Year --W Proposed Cost Structure * *4 Cost Based on 330 days of diversion 6 a_p O 2 ZL 0 0 0 0 2 4 MGD 6 8 10