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Work Plan and Time Schedule for Analyses of Background Groundwater Quality City of Stockton Regional Wastewater Control Facility Page I I 11.0 WATER QUALITY SAMPLING 11.1 GROUNDWATER MONITORING FIELD ACTIVITIES All groundwater and surface water samples will be collected using standard EPA-approved field procedures and according to the Sampling and Analysis Plan(revised)included in Appendix 4. All field activities, field personnel, dates, field parameter measurements, purge volumes and other pertinent data will be recorded on field data collection forms. 11.2 GROUNDWATER PARAMETER SUITE Table E-7 of the MRP in Order No. R5-2008-0154 defines the COCs related to degradation. For this background groundwater characterization work, all groundwater samples will be tested for a standard suite of constituents to include the parameters in Table E-7, and also those components of the general minerals suite needed to complete a calculation of cation/anion balances.The standard parameter suite for this program is specified in Table 5. 11.3 EFFLUENT SAMPLING PROGRAM The MRP specifies COC parameters for the effluent and requires weekly sampling at points PND-001 through PND-003. This data, collected as part of the operational monitoring will be used in the groundwater evaluation program, but additional samples will be needed to complete calculation of cation/anion balances. For this work, four separate samples from Pond 1 will be collected during routine groundwater monitoring for the first four quarters of the monitoring defined in this Work Plan. Those separate samples will be collected, handled and analyzed as are the groundwater samples. 11.4 SAMPLING SCHEDULE The sampling schedule is in Table 6. This program will collect monthly samples from the four new wells for the first quarter following well installation and quarterly samples thereafter. Wells MW-11 and MW- 14 are only required by the MRP to be sampled twice a year, but those wells are potential upgradient wells for the east side and data on new parameters are lacking; therefore, this program augments that sampling schedule to quarterly. This program also includes Pond 1 sampling on a quarterly basis for the first year. 11.5 ISOTOPE PILOT TESTING PROGRAM Stable isotope analyses of water molecules potentially provide a useful method for quantifying the degree to which pond effluent and groundwater mix. This could prove very valuable for documenting BPTC at the ponds. The need for isotope analysis is unclear until data from the new wells is available, but it is included in this Work Plan to define its use in the full scope of the potential background work. If used, an isotope sampling and analysis plan will be prepared. The purpose of the plan will be to determine if stable isotopes can be used, in combination with other data, to assess the water sources in groundwater at the RWCF. 12.0 REPORTING All field and analytical data will be compiled and tabulated as it is collected. Reports listed below will be provided by the Discharger to the Regional Water Board and other oversight agencies within the time frames cited below. • Monitoring Well Installation Report: A well installation report, signed by a licensed professional will be provided within eight (8) weeks after survey of the wells is completed. Wells will be sampled monthly for the first quarter after installation and at least quarterly thereafter. tJ CONDO