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CALIFORNIA REGIONAL WATER QUALITY.CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING ORDER NO. R6-2012-0106 FOR WASTE DISCHARGE REQUIREMENTS GLENN SPPRINGS HOLDING COMPANY FORMER OCCIDENTAL CHEMICAL COMPANY GROUNDWATER REMEDIATION PROJECT LATHROP FACILITY SAN JOAQUIN COUNTY This Monitoring and Reporting Program (MRP) describes requirements for monitoring a groundwater extraction and treatment system. This MRP is issued pursuant to Water Code Section 13267. The Discharger is required to comply with this MRP, which contains the minimum monitoring and reporting requirements necessary to determine compliance with the Waste Discharge Requirements Order (WDR) No. R5-2012-0106. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. Central Valley Water Board staff shall approve specific sample station locations prior to implementation of sampling activities. All 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 sample chain of custody form. TREATMENT SYSTEM MONITORING The monitoring program for the treatment system shall follow the schedule provided in the attached Tables 1 and analytical methods listed in Table 2. Table 1 lists all sampling locations and the sampling frequency. Table 2 lists the sampling constituents, analytical methods, and maximum practical quantitation limits. Sample collection and analysis shall follow standard EPA protocol. If necessary, equivalent analytical methods may be used with the concurrence of the Central Valley Water Board staff. The best currently approved analytical methods for DBCP have detection levels of 0.001 pg/L and practical quantitation levels of 0.01 pg/L. Both of these values are above the effluent limitation for DBCP, Compliance with the-efflue' nt limitation is demonstrated by measuring no detectable concentrations of DBCP when using the method(s) listed on MRP R5-2012-0106 and achieving the specified method detection limit. If new methods are approved that improve on the detection level and practical quantitation level, the MRP will be revised.