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Groundwater Monitoring Workplan NPDES permit, Order No. 5-00-031 White Slough Water Pollution Control Facility (WSWPCF) City of Lodi, San Joaquin County January 8, 2001 The City of Lodi has historically monitored seven (7) existing monitoring wells in the vicinity of the WSWPCF. The approximate locations of these wells (WSM1 through WSM7) are shown on Attachment 1. One of the conclusions of the Groundwater Evaluation Report for the City of Lodi WSWPCF dated October 2000 was that the existing monitoring wells are insufficient to adequately evaluate the potential impacts of the WSWPCF on nitrate concentrations in groundwater. The Conclusions and Recommendations sections of the Groundwater Evaluation Report are attached as Attachment 2. In response to Recommendation No. 1 from the Groundwater Evaluation Report, the City is expanding its groundwater monitoring system to better understand the impacts of WSWPCF operations on local groundwater. Nine (9) new monitoring wells are being added to the City's monitoring program. The approximate locations of these wells (P1 through P9) are shown on Attachment 1. Monitoring wells P5 and P9 were installed in December 2000 as part of the City's ongoing Percolation Treatment/Disposal Pilot Study. These two monitoring wells will be used for both the Pilot Study and for long-term groundwater monitoring. Wells P5 and P6 were installed in accordance with the Well Standards published by the San Joaquin County Public Health Services Environmental Health Division and inspected by the County. The basic construction details and general specifications for the new monitoring wells are included as Attachments 3, 4, and 5. Soils will be logged during drilling using the Unified Soil Classification System. The wells will be installed in accordance with San Joaquin County permit requirements. Access agreements will be secured for any groundwater monitoring wells that are located on property not owned by the City of Lodi. In response to Recommendation No. 2 from the Groundwater Evaluation Report, all existing and new monitoring wells (16 total) will be surveyed to record the elevation of the top of each well casing. The survey will be based on the current San Joaquin County datum. In response to Recommendation Nos. 3 through 5 from the Groundwater Evaluation Report, new protocols will be developed for(1) groundwater sampling and measuring, (2) noting conditions of canals near monitoring wells at time of sampling, and (3) documenting the monthly summaries of wastewater and biosolids application by area. The City intends to have the new monitoring wells installed and surveyed by April 31, 2001. The City also intends to have the new protocols developed by April 31, 2001. Page 1 of 2