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HomeMy WebLinkAboutAgenda Report - September 2, 2015 C-03AGENDA ITEM C=3 CITY OF LODI COUNCIL COMMUNICATION TM AGENDA TITLE: Approve Solicitation of Statements of Qualifications for Engineering Services for Continuous Self -Cleaning Coarse Screen, Replacement Motor Control Center, and Electrical and Instrumentation Upgrades at White Slough Water Pollution Control Facility MEETING DATE: September 2, 2015 PREPARED BY: Public Works Director RECOMMENDED ACTION: Approve solicitation of statements of qualifications for engineering services for continuous self-cleaning coarse screen, replacement motor control center, and electrical and instrumentation upgrades at White Slough Water Pollution Control Facility. BACKGROUND: The existing fine screen facility provides excellent protection of downstream equipment and increases reliability. Due to the current plant loading and the fine screening demands of the tertiary system, the existing screens require a high level of maintenance to provide reliability. An upstream coarse screening facility will reduce the loading to the fine screens and lower the required maintenance. The upstream coarse screening facility will also provide a connection for septage disposal outside of the existing plant fence line. This allows for connection during unstaffed hours. In addition to septage disposal, the facility will be equipped with a vactor dump station to provide coarse screening of the material and safer operations than the current dump facility. Continuous self-cleaning bar screens are recommended in the 2001 White Slough Water Pollution Control Master Plan. The estimated cost of these improvements is $6 million. The main plant electrical building or motor control center (MCC) was constructed in 1990. It has reached maximum capacity, has exceeded its anticipated life expectancy, and does not meet current building codes. The air quality of the MCC is poor due to its location downwind of the head works of the plant. The hydrogen sulfides emitted from the raw wastewater in the head works accelerates the corrosion of the wiring, electronics, concrete, and motors. A new electrical building located upwind of the head works will provide larger capacity, comply with current code requirements, and will include a more contained environment for the equipment and staff. The estimated cost of these improvements is $2.5 million. Although White Slough Water Pollution Control Facility (WSWPCF) has undergone expansions and improvements over the years to meet increasingly stringent discharge standards, a complete arc flash analysis of the system has yet to be completed. The occurrence of an arc flash or arc fault can be deadly. An arc flash is the result of a rapid release of energy within the MCC with the air as the conductor. They are generally limited to systems where the bus voltage is in excess of 120 volts. The processes and equipment at WSWPCF utilize 480 volts or higher. Arc flash analysis provides the plant staff with thorough understanding of the electrical potential within the lineup of the plant. This knowledge is critical to the safety of the WSWPCF staff. The multiple improvement projects have resulted in a variety of electrical and instrumentation standards being implanted. A complete survey of the electrical and instrumentation equipment is necessary to determine what modifications are required to maintain the plant reliability and operational safety. The estimated cost of these electrical and control improvements are $1.5 million. APPROVED: ti -Steohen Schwas suer, City Manager K:\WP\White Slough\Plant Assessment Council Comm.doc 8/26/2015 Approve Solicitation of Statements of Qualifications for Engineering Services for Continuous Self -Cleaning Coarse Screen, Replacement Motor Control Center, and Electrical and Instrumentation Upgrades at White Slough Water Pollution Control Facility September 2, 2015 Page 2 Currently, the ultra violet (UV) system is undergoing an evaluation to determine the most cost effective alternative of keeping the high maintenance 10 year old Trojan facility, changing the UV lights to another style compatible with the Trojan facility, or replacing the entire UV facilities with those from another manufacturer. Depending upon the final recommendation, engineering services may be required for the design of the replacement facilities. The cost of these improvements is unknown at this time. A field investigation of several of the concrete process tanks within the plant was recently conducted. Several of the tanks showed signs of corrosion due to age and high hydrogen sulfides levels. Photos provided in Attachment 1 demonstrate the severity of the corrosion. These photos were taken in 2011 during a primary influent channel cleaning project. The walls were badly corroded and intermediate repairs were made at the time. A complete plant structural assessment is warranted to prevent any future emergency actions related to structural failure. The cost to repair corrosion damage concrete tank structures is unknown but is suspected to be approximately $2.5 million. The last complete Operations & Maintenance (O&M) manual for WSWPCF was written in 1978. An updated O&M manual is not only critical to plant operations, but is also a regulatory requirement, which is currently not being met. In May 2014, Regional Water Quality Control Board (RWQCB) staff conducted a plant inspection and state staff recommended that WSWPCF update the 1978 O & M manual. During the July 2015 inspection, the RWQCB staff noted that it had not been accomplished. The O&M manual is intended to be a guide for plant operation, maintenance, training, and regulatory compliance and needs to be continuously updated. Staff was requested by Council to explore options of preparing in-house the O&M manual. The factors impeding in-house preparation of this document are the lack of computer aided drafting expertise and software within the WSWPCF staff, the lack of administrative staff time to produce the several hundred page document, and limited blocks of time for staff to prepare the equipment, process, control and standard operating procedures descriptions. Staff recommends that City Council approve the solicitation of statements of qualifications for engineering services in an effort to plan important upgrades and needed maintenance. FISCAL IMPACT: Not applicable. FUNDING AVAILABLE: Not applicable i/Ij a in , , -I -0/_ F. Wally Sajdelin Public Works Director Prepared by Karen Honer, Wastewater Plant Superintendent FWS/KH/tb Attachment K:\WP\White Slough\Plant Assessment Council Comm.doc 8/26/2015 I ft k w