MOONLIGHT BEACH SEWER PUMP STATION · PDF fileMoonlight Beach Sewer Pump Station Renovation...

Moonlight Beach Sewer Pump Station Renovation Project CBI Grant No. 02-234-550-0
MOONLIGHT BEACH SEWER PUMP STATION RENOVATION PROJECT
Clean Beaches Initiative Grant Program
Grant Agreement No. 02-234-550-0 Total Grant Funds $893,500
FINAL REPORT December 2007
CITY OF ENCINITAS Carlsbad Hydrologic Unit
San Marcos Creek Watershed (904.5)
Refer correspondence to: Kipp Hefner, City of Encinitas
505 Vulcan Avenue, Encinitas, CA 92024 (760) 633-2775
[email protected]

Prepared for State Water Resources Control Board
Acknowledgements
Partial funding through State Water Resources Control Board, Clean Beaches Initiative Program Grant Managers: Laura Peters and Kathryn Bare
Encinitas City Council
City of Encinitas Engineering Department
505 South Vulcan Avenue Encinitas, CA 92024
Kipp Hefner, P.E., Project Manager, (760) 633-2775
Peter Cota-Robles, P.E., City Engineer Leroy Bodas, P.E., Senior Civil Engineer
San Elijo JPA
Mike Thornton, Director
Consultants and Contractors
Falcon General Engineering, Construction Kennedy Jenks Consultants, Pre-Design & Design
Meleah Ashford, P.E., Grant Management

GRANT SUMMARY
Date filled out: 6/15/06 (Update 11/15/07)
Grant Information: Please use complete phrases/sentences. Fields will expand as you type. 1. Grant Agreement Number: 02-234-550-0
2. Project Title: Moonlight Beach Sewer Pump Station Renovation Project
3. Project Purpose Problem Being Addressed: Reducing sewer overflows
4. Project Goals a. Short-term Goals: Renovate sewage pump station and provide for emergency overflow storage
capacity. b. Long-term Goals: To protect public and environmental health by reducing or eliminating sanitary sewer
overflows into Cottonwood Creek and Moonlight Beach. This will reduce the number of beach closures at Moonlight attributable to sewage overflows.
5. Project Location: (lat/longs, watershed, etc.) Lat Degrees: 33.048809 , Long Degrees: -117.2966385 Carlsbad Hydrologic Unit, San Marcos Creek Watershed (904.5)
a. Physical Size of Project: (miles, acres, sq. ft., etc.) 10,000 sq. ft.
b. Counties Included in the Project: San Diego
c. Legislative Districts: (Assembly and Senate) Assembly: 74, Senate : 38
6. Which SWRCB program is funding this grant? Please X box that applies.
Prop 13 (CBI) Prop 40 Prop 50 EPA 319(h) Other
Grant Contact: Refers to Grant Project Director. Name: Peter Cota-Robles Job Title: City Engineer
Organization: City of Encinitas Webpage Address: www.ci.encinitas.ca.us Address: 505 S. Vulcan Avenue Encinitas, CA 92024
Phone: (760)633-2771 Fax: (760)233-2818
E-mail: [email protected]
Grant Time Frame: Refers to the implementation period of the grant. From: 1/1/03 To: 1/31/08 Project Partner Information: Name all agencies/groups involved with project.
City of Encinitas (grantee) SWRCB (grantor)
Nutrient and Sediment Load Reduction Projection: (If applicable) N/A

Table of Contents
Executive Summary 1.0 Introduction........................................................................................................... 1 2.0 Problem Statement & Relevant Issues ................................................................. 1
2.1 Project Description..................................................................................... 2 2.2 Project Costs ............................................................................................. 2 2.3 Project Methodology .................................................................................. 2 2.4 Pre-Construction and Post Construction Condition.................................... 4 2.5 Data Evaluation/Pollutant Reduction ......................................................... 5
3.0 Public Outreach ................................................................................................... 5 4.0 Project Evaluation & Effectiveness ....................................................................... 6
4.1 Project Objectives...................................................................................... 6 4.2 Monitoring Results ..................................................................................... 6
5.0 Conclusions........................................................................................................ 10 List of Tables Table 1: Summary of Project Submittals ......................................................................... 3 Table 2: Summary of Sewer Spills and Beach Closures at Moonlight State Beach ........ 5 Table 3: Summary of Beach Closure Scenarios............................................................ 10 List of Figures Figure 1: Moonlight Beach State Park at Sewer Pump Station ....................................... 1 Figure 2: Pump Station Pre-Construction and Post Construction.................................... 5 Figure 3: Annual Sewage Released to Environment ....................................................... 8 Figure 4: Days of Closure Due to Sewage Spills at Moonlight Pump Station.................. 9 Appendices Appendix A: Project Photos Appendix B: RWQCB Sanitary Sewer Overflow Data for Moonlight Beach Appendix C: San Diego County Department of Environmental Health Beach Closure &
Advisory Report Data for Moonlight Beach Appendix D: Pump Upgrade Capacity and Storage Capacity Calculations

Final Report Page ES-1
EXECUTIVE SUMMARY The Moonlight Beach Sewer Pump Station, originally construction in 1974, is located in the City of Encinitas, a coastal community of 60,000 approximately 22 miles north of San Diego California. The pump station is sited at the intersection of 3rd and B Streets. It is owned by the City of Encinitas, but operated and maintained by the San Elijo Joint powers Authority (SEJPA). The pump station is a critical part of the Citys sewer infrastructure. It conveys an average daily flow of 1.1 million gallons per day (MGD) of raw sewage collected from the central area of the City and pumps it through a force main to the Encina Water Pollution Control Facility in Carlsbad, California. The California Regional Water Quality Control Board listed the Pacific Ocean at the outlet of Cottonwood Creek (at Moonlight State Beach) as 303(d) impaired by coliform bacteria. Historically, there were two significant sources of bacteria pollution in Cottonwood Creek; urban runoff and sewer overflows from the Moonlight Beach Sewer Pump Station. In the past, Moonlight Beach has been frequently posted with health advisories due to elevated bacteria associated with urban runoff and closed due to sewer over flows associated with pump station failures. Rehabilitating the pump station consisted of constructing an emergency underground storage basin; moving all electrical equipment above-grade at a location above the Cottonwood Creek 100 year flood level to significantly reduce the likelihood of flooding electrical equipment; upgrading and moving the electrical transformer which feeds power to the pump station to a location outside of the Cottonwood Creek 100 year flood level which eliminates the risk of the transformer shorting out due to flooding, significantly improving the existing SCADA alarm system, building a masonry structure to house the electrical control panels, motor control center, and pump motors above grade, installation of an odor control system, replacing/upgrading pumps with three 60 HP vertical centrifugal pumps, installation of in-line grinders which prevent the pumps from clogging, replacing/upgrading auxiliary generators, and making modifications to the existing Moonlight Beach Urban Runoff Treatment Facility. The project was initiated in 2003 and completed on May 11th, 2007 and the pump station was brought on line in its full capacity. All of the planned improvements were constructed and the project objectives were achieved, as listed below:
The new overflow basin has a detention time of 3.6 hours, which is a 1,000% increase over the pre-project conditions.
Mechanical, electrical and instrumentation equipment was replace, including a 27% increase in pumping capacity.
The site was raised and constructed to provide protection from a 100 year flood in the adjoining Cottonwood Creek.
Electrical equipment was moved to a new upper floor above the 100 year flood level.
Installation of a by-pass valve was completed to the UV Facility so that 85% of the creek can be diverted to the sewer pump station (and on to the treatment plant) in the case of a sewage spill upstream in the watershed.
The ultimate test of the project success is the reduction of sewage spills associated with pump station failures that impact Moonlight Beach. Since the project has been completed, there have been no sewage spills.

Final Report Page 1 of 10
1.0 Introduction The Moonlight Beach Sewer Pump Station, originally construction in 1974, is located in the City of Encinitas, a coastal community of 60,000 approximately 22 miles north of San Diego California. The pump station is sited at the

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