March 3, 2016 Discovery Sewer/RWQCB LSM Vallecitos Water District Regional Water Quality Control Board (RWQCB) Lake San Marcos February 10, 2010

History of District Sewer System District formed on March 21, 1955 Sewer improvement district was formed in 1958 to build a collection and treatment system Lake San Marcos Community sewer infrastructure installed from approximately 1962 to the early 1970s Recent Sewer Data (District wide) Private YrAnnual Flows (gal) Released (gal) Recovered (gal)Laterals Spills ,018,450,000 34, ,168,100,000 3,185 3, ,168,100,000 4,155 3, ,332,350, ,460,100,000 1, ,498,425, , ,536,750, ,449,150, ,569,600, ,690,050, ,922 gal 8,102 gal

Sewer System information Meadowlark Reclamation Facility (MRF) Treats up to 5 MGD of Title 22 recycled water. Carlsbad and Olivenhain Municipal Water District’s purchase 100% of recycled water for resale. Encina Wastewater Authority (EWA) Regional sewage treatment/disposal facility. Vallecitos owns treatment capacity of 7.54 MGD in addition to solids handling capacity for all District sewage flows Sewer Mains 240 miles of sewer ranging in size from 4-inches to 42-inches Majority of the sewer is VCP and PVC Outfall Approx 8 miles of sewer (pressure and gravity) from District to EWA Lift Stations LS1 – Diverts up to 2,200 gpm for treatment at MRF LSM – All flows from LSM Community to MRF, 1,792 gpm capacity Questhaven (LS3) – Takes all flows from southeast portion of District to MRF Montiel LS – Small LS east of Nordahl Road

District Boundary and Monitoring Manholes Map

Sewer System Information (cont) District Preventative Maintenance (District SSMP) District Preventative Maintenance (District SSMP) Fully staffed sewer maintenance department Fully staffed sewer maintenance department 16 metering manholes (calibrated annually), 11 odor control manholes 16 metering manholes (calibrated annually), 11 odor control manholes 3 Vactor trucks, CCTV equipment, 2 jetting trailers for cleaning sewer mains 3 Vactor trucks, CCTV equipment, 2 jetting trailers for cleaning sewer mains Clean collection sewers up to 12-inch on a 15 month schedule Clean collection sewers up to 12-inch on a 15 month schedule Clean large diameter sewers on a 3 yr schedule with quarterly inspection Clean large diameter sewers on a 3 yr schedule with quarterly inspection Analyze metering data during rain events to analyze inflow and infiltration Analyze metering data during rain events to analyze inflow and infiltration Smoke testing program Smoke testing program Manhole sealing program Manhole sealing program 6 Additional metering manholes (budgeted) 6 Additional metering manholes (budgeted) All facilities monitored 24 hours a day through SCADA All facilities monitored 24 hours a day through SCADA District performed smoke tests Fall of 2006 through the summer of 2007 of Entire LSM Community District performed smoke tests Fall of 2006 through the summer of 2007 of Entire LSM Community Approximately 17 miles of sewer lines with approximately 3300 sewer connections within the LSM drainage basin and community Approximately 17 miles of sewer lines with approximately 3300 sewer connections within the LSM drainage basin and community 30 clean-out caps missing or broken next to buildings, driveways, lawns 30 clean-out caps missing or broken next to buildings, driveways, lawns 11 drains connected to sewer from irrigation, hardscape and roof drains 11 drains connected to sewer from irrigation, hardscape and roof drains

Lake San Marcos Sewer Map (New Discovery Sewer)

Discovery Street Sewer Project Description Description Resulting from 2005 spills, District created a new CIP to reduce/eliminate future potential spills into San Marcos Creek Resulting from 2005 spills, District created a new CIP to reduce/eliminate future potential spills into San Marcos Creek Existing 8-inch gravity sewer pipeline conveyed wastewater from Discovery Street across San Marcos Creek to LS1 Existing 8-inch gravity sewer pipeline conveyed wastewater from Discovery Street across San Marcos Creek to LS1 Due to location near and in San Marcos Creek, the sewer was susceptible to I & I during wet weather events. Due to location near and in San Marcos Creek, the sewer was susceptible to I & I during wet weather events. Replaced 8-inch pipe with 12-inch and 15-inch pipe from Discovery Street through LSM Community to the Lake San Marcos Lift Station Replaced 8-inch pipe with 12-inch and 15-inch pipe from Discovery Street through LSM Community to the Lake San Marcos Lift Station The old sewer in San Marcos Creek as been filled with slurry and abandoned eliminating a potential spill location in San Marcos Creek The old sewer in San Marcos Creek as been filled with slurry and abandoned eliminating a potential spill location in San Marcos Creek New sewer improves flows and operation of LSM Lift Station allowing greater reclamation of sewer for recycling New sewer improves flows and operation of LSM Lift Station allowing greater reclamation of sewer for recycling New sewer improved sewer operations by eliminating drop sections with deeper sewer line. New sewer improved sewer operations by eliminating drop sections with deeper sewer line. Construction cost $1.5 million Construction cost $1.5 million

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