WORK PLANS - Laserfiche WebLink

Home Browse Search

Monitoring Well Installation Work Plan White Slough Water Pollution Control Facility ' 2.0 OVERVIEW OF THE WPCF The City owns and operates the WPCF site, which encompasses the main wastewater treatment facilities and 880 acres of surrounding area. The WCPF site is in San Joaquin County along the Interstate 5 (I-5)/Highway 99 corridor between Sacramento and Stockton. Specifically, the WPCF site is located southwest of the City along the west side of 1-5 about two miles south of the Highway 12 interchange, as shown on Figure 2-1. The WPCF treatment facilities are designed to accommodate flows and loads associated with an 8.5 million gallon per day (mgd) average dry weather flow. The WPCF receives and treats municipal wastewater influent from a service area encompassing the City and San Joaquin County's Flag City service area. During the irrigation season (generally mid-April through September), treated municipal effluent is discharged to the WPCF's 328-acre-feet storage ponds for subsequent irrigation on 790 acres of irrigated fields located on the City-owned properties surrounding the treatment facilities. The City also maintains a separate industrial process water collection and disposal system for several industries within the City. In addition, stormwater from some industrial areas within the City and from some of the irrigated fields surrounding the WPCF is also collected by the industrial collection system. The industrial process water flows are dominated by the flow from the Pacific Coast Producers cannery, a fruit processor that primarily discharges during the fruit canning season (June through September). During the canning season, the industrial wastewater entering the WPCF is blended with treated municipal effluent and is applied directly to the 790-acre reuse area. The remainder of the year, when the industrial wastewater flows are significantly less, the industrial process water (and, at times, stormwater) is stored in the WPCF's storage ponds. Tailwater and stormwater runoff from the irrigated fields is also captured and returned to the storage ponds. In addition, the City land applies Class B biosolids within the 790-acre reuse area. Throughout the year,the City also provides recycled water(tertiary treated municipal effluent)to two Northern California Power Agency (NCPA) power plants, primarily for steam production and cooling water, as well as to the San Joaquin County Mosquito and Vector Control District for use in fish-rearing ponds. Municipal effluent not needed to satisfy the irrigation demands on the 790-acre reuse area is discharged to Dredger Cut, a dead end slough of the Sacramento-San Joaquin River Delta. From approximately September through April, all of the WPCF effluent is discharged to Dredger Cut. 3.0 RATIONALE FOR LOCATION The City is currently preparing a Best Practicable Treatment or Control (BPTC) Study pursuant to Provision VI.C.5.a of the WDRs. As part of preparing this BPTC Study and evaluating groundwater water quality data for the last several years, the City has come to suspect that the City's existing monitoring well WSM-2 may have been damaged during construction of tertiary improvements to the WPCF, which were completed in January 2009. If WSM-2 is indeed damaged, samples from this well may not be providing representative groundwater quality information. WEST YOST ASSOCIATES 2 City of Lodi September 2014 Monitoring Well Installation Work Plan w\c\213\06-14-31\wp\WP\083014_1 RWP