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14 February 2020 , AdvancedGeo Project No. 17A047 .Tnr�•- Page 2 of 4 The investigation is required before a request to terminate the MR permit can be submkted. The investigation will be performed in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) conditional work plan approval letter dated 13 November 2019 (Appendix A). Additionally, at the request of the CVRVJQCB, groundwater samples will be collected from well W4 and analysed for the full list of chemicals outlined in MR Order No. R5-2015- 0062 dated 24 May 2001 , and Monitoring and Reporting Program (MRP) 05-01 0114, dated 29 April 2015. Sampling results from W-0 will be reported in the Soil Investigation Report or the Quartedy GroutMwafer Monitoring Report — First Quarter 2020. BACKGROUND The CVRWQCB issued the facility MR Permit 05-01-144 for discharge of wastewater and stornmeter through on-site treatment. Four areas were initially designated for discharge. However, three active areas were previously utilized and currently only two locations accept stormwater and treated wastewater. The four areas of discharge were designated: • Site A: 42 acres of now developed area no longer used; Site A was removed from the MR permit in 2018, • Site B: 13.5 acres not used for application of water; background samples were collected from Site B during the September 2017 investigation. • Site C: 8.5 acres used for land application. • Lawn Areas: 11 .4 acres used for land application. Currently, wells W-4 and W-7 are located in Site C, and wells Wa and W-6 are located in the main Lawn Area (Figure 2). The wells are sampled quarterly as part of the MR. Additional backgrounM information forthe site was included in the: Soil Investigation Work Plan dated 10 July 2017; Soil Investigation Report dated 15 November 2017; and Quarterly Groundwater Monilonng Report— Fourth Quarter201g dated 24 January 2020. The fist quarter groundwater monitoring event was performed on 05 February 2020, a report will be submitted before the end of the first quarter 2020. The site is planned to be developed and connected to the local sanitary sewer utility. AGI has developed this Work Plan to be prepared for site development activities and expediate fire well destruction schedule for the wells located in the development area (W<, W-], and W-8). The wells will be destroyed by ever drilling methods and in accordance with San Joaquin County Well Standards.