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MONITORING AND REPORTIOROGRAM NO. R5-2008-0819 , - 3 - PIONEER AMERICAS LLC TRACY, SAN JOAQUIN COUNTY Table 2 Required Frequencies: Water Level Measurements, Laboratory Chemical Analyses, and Water Supply Well Flow Recordings Monthly Semi- Depth to VOC' Semi-3 Annual° neral Annual Annual Monthly Well Name Water Analysis Quarterly VOC Annual VOC Chloride Ges Flow Measurement Wellhead Analysis VOC Analysis & Sodium Constituent Recording Frequency Treatment2 Analysis Analyses Analysis MW-1 Quarterly X X X MW-2 Semi-annual X X X MW-3 Semi-annual X X X MW-6 Semi-annual X X X MW-7 Quarterly X X X MW-9 Semi-annual X X X MW-10 Semi-annual X X X MW-11 Semi-annual X X X MW-12 Semi-annual X X X MW-13 Quarterly X X X MW-14 Semi-annual X X X MW-15 Quarterly X X X LM151B Quarterly X X X LM177B Quarterly X X X AP-2 Quarterly X X X Homestead 6 X' Reed 6 X' Medina 6 X' New Pombo 6 X8 AP-1 6 X X Banta #1 6 X X Banta#2 6 X X 1 Volatile organic compounds specified in Table 1. 2 Future wellhead treatment system(s) influent, mid-stream, and effluent samples must be analyzed monthly. If after one year of consecutive monthly sampling,the influent sample concentration remains below the Practical Quantitation Limit(PQL),the analysis frequency may be reduced to quarterly. 3 All semi-annual events must be conducted during the first and third quarters of the year. 4 All annual events must be conducted during the third quarter of each year. 5 General constituents specified in Table 1. 6 Depth to water measurements not practical due to the well pump and distribution piping. 7 Annual if four previous, consecutive quarters were below the PQL. 8 Bi-annual if four previous, consecutive quarters were below the PQL. The new Pombo well, constructed in 2007, is screened and sealed below the Corcoran Clay.