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City of Lathrop Monitoring Well Installation Report Phase 1 1.0 INTRODUCTION This Monitoring Well Installation Report is submitted pursuant to Provision G.1.e of the City of Lathrop's Waste Discharge Requirements Order No. R5-2005-0045 (WDR's). The report describes the installation and development of new Phase 1' ' monitoring wells, destruction of existing monitoring wells and piezometers, and explains deviations from the "Monitoring Well Installation Workplan" and "Groundwater Monitoring Workplan Addendum", approved by Regional Water Quality Control Board staff (RWQCB) on May 12, 20052. Consistent with the WDR's, the installation of Phase II monitoring wells shall be addressed in a report submitted at a later date. 1.1 General Information Background The City of Lathrop is constructing a wastewater treatment facility that it will own and operate for a new planned community that consists of residential and commercial developments. The project will be phased: Mossdale (Phase 1) and River Islands (Phase 2). The Phase 1 and 2 capacity is anticipated to only serve development within the Mossdale and River Islands areas Figure 1 shows the locations for the Phase 1 wastewater treatment facility and Mossdale subarea, ' which includes the new wastewater treatment plant expansion (MBR WWTP), a wastewater collection system, recycled water storage ponds, a recycled water delivery system, and land application areas. Recycled water will be applied in ' the Mossdale subarea by drip irrigation, flood irrigation, or sprinklers at agronomic rates for both nitrogen and water application. This report documents ' ' The City of Lathrop requested a two-phase development of land application areas for the disposal of recycled water(Phase 1 and Phase 2). Phase 1 includes areas presently owned by the City of Lathrop. The Phase 2 land application areas are also identified in the City's WDR, however discharge to Phase 2 lands will be allowed only upon the City documenting a long-term ' lease arrangement between the City and Califia LLC, completes improvements, and obtains written authorization by the Executive Officer of the RWQCB to proceed. 2 On April 18 2005, HydroFocus, Inc. submitted the"Monitoring Well Installation Workplan" on ' behalf of the City of Lathrop pursuant to Waste Discharge Requirements Order No. R5-2005- 0045, Provision G.1.c. The workplan described a proposed monitoring network (Phase 1 and Phase 2), the sampling and analysis plan (SAP), and recommended quality assurance protocols to meet the City's monitoring requirements. In response to RWQCB staffs April 22, 2005 ' "Conditional Approval of Groundwater Monitoring Workplan", on April 26, 2005 HydroFocus, Inc. submitted a"Groundwater Monitoring Workplan Addendum". The Workplan and Workplan Addendum were approved by RWQCB staff on May 12, 2005. 1