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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2015-0012-043 4 SAN JOAQUIN COUNTY PUBLIC WORKS SAN JOAQUIN COUNTY without Central Valley Water Board concurrence. Additional requirements are detailed in the REPORTING section below. 2. Samples should be representative of the volume and nature of the discharge or matrix of material sampled. The time, date, and location of each grab sample shall be recorded on the legal chain of custody form. GROUNDWATER MONITORING 3. As shown on Figure 1, there are 10 monitor wells, 7 ozone injection wells, 1 soil vapor extraction (SVE) well, and 1 SVE/air-sparge (AS) well associated with this Site. The groundwater monitoring program for these wells and any treatment system wells installed subsequent to the issuance of this MRP shall follow the schedule below. Monitoring wells with free NAPH or visible sheen shall be monitored, at a minimum, for NAPH thickness and depth to water. The volume of extracted groundwater, if applicable, shall also be provided in quarterly monitoring reports. Sample collection and analysis shall follow standard EPA protocol. For the purpose of the proposed full-scale implementation, all Site wells have been divided and identified as Background Zone wells (MW -5, MW -6, MW -7), Treatment Zone Wells (MW -1, MW -2), Transition Zone wells (MW -9, MW -10), and Compliance Zone wells (MW -3, MW -4, MW -8). The monitoring wells, extraction wells and/or injection wells shall be sampled according to the schedule in Tables 1A and 1 B and the samples analyzed by the methods in Table 2, as follows: Table 1A: Samplings Frequency (Prior to Full -Scale Implementation) Well Number' Frequency2 Constituent3 Monitoring Objective MW -1, MW -2 Other8 Suite A, Suite B Treatment Zone MW -9, MW -10 Other8 Suite A, Suite B Transition Zones MW -3, MW -4, MW -8 Other8 Suite A, Suite B Compliance Zone6 MW -5, MW -6, MW -7 Other8 Suite A, Suite B Background Zone? 1 Well Numbers and location as shown on Figure 1 2 i.e. weekly, monthly, quarterly, semi-annually, annually, other. Semi-annual sampling occurs 1 st and 3rd quarters, annual sampling occurs 1 st quarter, biennial sampling occurs every two years in 1 st quarter, with the first sampling during year two. 3 Constituent analytical methods are listed in Table 2 4 Well used to evaluate in-situ bioremediation progress inside the treatment zone, to gauge effectiveness of ISCO injection in reducing the dissolved petroleum hydrocarbon concentrations, and to monitor potential changes in groundwater geochemistry that could be attributed to the injection of oxidizing agents.