Perez, Eduardo

Eduardo Perez is an Environmental Engineer with the City of Los Angeles. He currently manages the System-wide Planning group. He has over 15 years of experience in project management, hydraulic modeling, infrastructure upgrade, rehabilitation planning and condition assessment, CEQA evaluations, and sewer capacity analysis for the Citys wastewater collection system. Eduardo obtained his Masters Degree in Public Administration from California State University, Northridge, a bachelors degree in Civil Engineering from Cal Poly, Pomona and is a California registered civil engineer.

Titles from this speaker

Bio-trickling Filter and Increased Corrosion Potential

Abstract

In 2017, the Donald C. Tillman Water Reclamation Plant (DCTWRP) began construction on the "Blower Foul Air Clean-Up System". The intention of the project was to protect the existing blowers and other ancillary equipment by installing a system to pre-treat the collected foul air. The foul air contains corrosive moisture-laden hydrogen sulfide gas, particulate matter, dust, mists, and greasy aerosols that could plug the blower filters, coat the blower internals, and plug aeration basin diffusers. To clean up the air, a bio-trickling filter (BTF) was selected. It was found that the BTF successfully removed hydrogen sulfide; however, the plant’s blowers began to exhibit increased deterioration. To mitigate this issue, activated carbon (AC) adsorber units will be installed. This paper will discuss the specification of the BTF and AC towers; process data from the BTF operation, and investigate the cause and solution of the blower corrosion.

This paper will discuss the research which went into the specification for the BTF; provide process data during the BTF's commissioning, start up, and operation; and describe the investigation to identify the cause and solution of the blower corrosion.

SpeakerSoutherland, Richard

Presentation time

16:30:00

16:50:00

Session time

15:30:00

17:00:00

SessionManaging the Third Effluent Part I

Session locationRoom N426b - Level 4

TopicIntermediate Level, Municipal Wastewater Treatment Design

Author(s)

Southerland, Richard

Author(s)R. Southerland 1; E. Perez 2 ; S. Hammond 3; M. Ruiz 4; S. Hammond 3; N. Chacon 1; R. Southerland 1; B. Fraser 4; R. Mayuyu 4;

Author affiliation(s)City of Los Angeles Sanitation and Environment 1; City of Los Angeles Sanitation and Environment 2 ; Parsons Corporation 3; City of Los Angeles Sanitation and Environment 4; Parsons Corporation 3; City of Los Angeles Sanitation and Environment 1; City of Los Angeles Sanitation and Environment 1; City of Los Angeles Sanitation and Environment 4; City of Los Angeles Sanitation and Environment (LASAN) 4;

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2023

DOI10.2175/193864718825159039

Volume / Issue

Content sourceWEFTEC

Word count7

Description: The Venice Dual Force Main: Ensuring Resiliency through Redundancy in a Historically...

The Venice Dual Force Main: Ensuring Resiliency through Redundancy in a Historically Large Scale Micro-Tunneling Project

Abstract

This paper presents resiliency through redundancy construction management considerations and techniques that were used in the Venice Dual Force Main project. The project’s intent is to construct a second force main sewer to operate in tandem with the existing force main sewer for the purpose of fulfilling the three key objectives, (1) The new force main will operate as a parallel system in conjunction with the existing 48” force main to meet the existing Peak wet weather Flow demands experienced at Venice Pumping Plant. (2) Add operational flexibility and reliability. (3) Allow isolation of either force main during low flow conditions to perform necessary cleaning and maintenance.

SpeakerPerez, Eduardo

Presentation time

15:30:00

15:50:00

Session time

15:30:00

15:50:00

SessionCollection System Force Mains

Session number219

TopicAsset Management, Collection Systems, Resilience, Disaster Planning and Recovery

Author(s)

I. AhmedE. PerezG. MkrtchyanA. PoostiL. MerreroC. GilaniK. Redd

Author(s)I. Ahmed2; E. Perez1; G. Mkrtchyan2; A. Poosti1; L. Merrero1; C. Gilani1; K. Redd2;

Author affiliation(s)City of Los Angeles, LA Sanitation and Environment1; City of Los Angeles, Bureau of Engineering2

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2020

DOI10.2175/193864718825157832

Volume / Issue

Content sourceWEFTEC

Word count17

The Venice Dual Force Main--Ensuring Resiliency through Redundancy in a Historically Large Scale Microtunneling Project

Abstract

The Venice Dual Force Main: Ensuring Resiliency through Redundancy in a Historically Large Scale Microtunneling Project This paper presents resiliency through redundancy construction management considerations and techniques that were used in the Venice Dual Force Main project. The project's intent is to construct a second force main sewer to operate in tandem with the existing force main sewer for the purpose of fulfilling the three key objectives, (1) The new force main will operate as a parallel system in conjunction with the existing 48' force main to meet the existing Peak wet weather Flow demands experienced at Venice Pumping Plant. (2) Add operational flexibility and reliability. (3) Allow isolation of either force main during low flow conditions to perform necessary cleaning and maintenance. During the heavy storms in 1995, Venice Pumping Plant VPP experienced tremendous amount of peak wet weather flow (PWWF) that was contributed by stormwater infiltration in the sewershed. At times, the PWWF exceeded the maximum capacity. As a result, sewage rose in the plant's equalization wet well, reaching critical level. With this potential serious public health and environmental risk, the City of Los Angeles recognized the need to increase the output capacity in order to be resilient to the existing infrastructure. With this Project the current and proposed capacity concluded that the addition of this 54' force main sewer will increase the current capacity from 44,000 gpm to 57,000 gpm, with 4 pumps operating and 1 pump in stand-by mode. With the current PWWF of 45,000 gpm, the combined 54-inch/48- inch dual force mains can safely handle, in tandem, this capacity with 3 pumps in service and 2 pumps in stand-by mode. The project is in the City of Los Angeles in the communities of Venice and Playa Del Rey which constructs approximately 10,800 feet of a new 54-inch-diameter force main sewer in the City of Los Angeles, California. The construction is being performed under a major 4 lane road in the neighboring city of Marina del rey, adjacent to multi-million dollar residences and below the water table and a dense layer of existing utilities and then crosses under the Marina Entrance Channel and Ballona Creek. From there, the alignment continues south along Pacific Avenue and Vista del Mar and connects to the junction structure of the Coastal Interceptor Sewer Venice Dual Force Main (CIS) and North Outfall Sewer (NOS) next to high visibility beach areas. To manage this complex microtunneling project in both politically and environmentally sensitive area, a team of Project, Engineering, Construction and Public Outreach management were organized to plan the tasks of design, constructability review, geotechnical investigations, environmental assessment, right of way assessment, permitting evaluations, multiple solicitation/bid and award stages, and through construction and close out. The trenchless construction method, which utilizes hydraulic jacks to push pipes through the ground behind a remotely operated Micro-tunnel boring machine (MTBM). Drive lengths are generally limited to about 1,000 feet, depending upon ground conditions and pipe size; but intermediate jacking stations can be used to extend the drive length. Unlike conventional trenching techniques that require excavation for the entire length of pipeline, excavation for tunneling is limited to the endpoints of each drive at designated launching (jacking) and receiving pits. The launching pit contains the hydraulic jacks used to push the pipes, and the receiving pit is used to recover the TBM at the end of each drive. Tunneling can proceed intermittently; although, it is often necessary to proceed continuously, particularly on long drives through sticky soils, to prevent the pipe from getting stuck short of the receiving pit. Tunnel advance rates are typically between 30 and 50 feet per 8-hour work shift, depending on soil conditions and pipe size. The tunnel face is supported by a thick liquid ('slurry'), which is a mixture of the excavated soil ('muck') and bentonite (a natural clay mineral). Keeping the slurry pressurized in a closed chamber behind the cutter-head of the TBM prevents groundwater and excess soil material from entering the TBM. During construction, the Construction Management Team implemented processes to monitor and report on a daily basis any potential problems including soil related issues (i.e. heave, settlement, slurry consistency) and tunneling machine issues (i.e. misalignment, steering or stoppage). Other than the normal construction management factors, additional processes were implemented along with a comprehensive public outreach program to mitigate public nuisances and complaints (i.e. noise and vibration problems and traffic flow). Conclusion: This paper will provide guidance and lessons learned for planners, engineers, designers, construction managers on planning, designing, and construction management of large scale microtunneling projects to ensure sustainability and redundancy to their existing infrastructure.

This paper was presented at the WEF Collection Systems Conference in Detroit, Michigan, April 19-22.

SpeakerPerez, Eduardo

Presentation time

13:30:00

14:00:00

Session time

13:30:00

16:30:00

Session number12

Session locationHuntington Place, Detroit, Michigan

TopicCollection Systems, Construction, Deep sewer tunnel

Author(s)