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Boulevard Automotive, Stockton - 2 - 30 August 2023 3. By 31 October 2023, please submit a work plan for the installation of a dedicated deep zone bio-sparge well within 30 feet of MW-16. 4. The complete pilot test scope of work, including both the Frey proposals and the Central Valley Water Board staff comments, is presented in Table 1 and Table 2 below. Table 1 - Summary of Pilot Test Duration, Bio-S are Wells, and Observation Wells Bio-s ar a Wells Observation Wells Max Bio- Test Screen Screen Distance from sparge Duration Wells Intervals Wells Intervals Wells MW-15 Pressure and MW-16 ftb s ftb s ft (psi) IW-2 30-50 5 MW-15 40-50 IW-4 30-50 27 IW-6 30-50 30 5 days' MW-26 40-50 42 20 (MW-15); MW-10C 70-75 67 40 (MW-16) New MW-11 C 70-75 89 Dedicated -70-80 Deep Well MW-16 70-80 -- MW-18 70-80 86 ft= feet; bgs= below ground surface; psi= pounds per square inch; Duration is 5 days from the determination of breakthrough pressure. Breakthrough pressure will be determined by slowly adding pressure in 3 psi increments every 5 minutes until breakthrough is achieved. Table 2 - Summary of Pilot Test Monitoring Parameters Wells Utilized Baseline Test Parameters Frequency Parameters Frequency Measurements Measurements Every 15 Well-head Well-head minutes for first pressure, air flow hour, then pressure, pH, rate every 24 hours temp, oxygen, ORP, DO Measurements Bio-sparge & Once prior pH, temp, oxygen, Once Observation Groundwater to start of ORP, DO immediately Sample Analysis injection following CFU, COz, TOC, Groundwater completion of nitrogen, Sample Analysis injection, and CFU, COz, TOC, again 7 days phosphorous, nitrogen, later iron phosphorous, iron temp= temperature; ORP= oxygen reduction potential, DO= dissolved oxygen; CFU= colony forming units; CO2=carbon dioxide; TOC= total organic carbon