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,- • RECEIVED <br /> DEC 27 2013 <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION ENVIRONMENTAL <br /> HEALTH DEPARTMENT <br /> REVISED MONITORING AND REPORTING ORDER NO. R6-2012-0106 <br /> FOR <br /> WASTE DISCHARGE REQUIREMENTS <br /> GLENN SPPRINGS HOLDING COMPANY <br /> FORMER OCCIDENTAL CHEMICAL COMPANY <br /> GROUNDWATER REMEDIATION "ROJECT <br /> LATHROP FACILITY' <br /> SAN JOAQUIN COW—NTRY <br /> This Revised Monitoring and Reporting PrograM>, MRP) describes requirements for <br /> monitoring groundwater, monitoring a groundwater extractionaV. a..treatment system, <br /> and monitoring the backup supply wellhezd (€BSW) treatment system This revised <br /> MRP is issued pursuant to Water Code Section 13267. The Discharger is required to <br /> comply with this MRP, which contains the min mum mo in Loring and repng <br /> requirements necessary to determine compliance with the Waste Dischafge <br /> Requirements (WDR) No. R5 20'i21`06. The Discharger shall not implement any <br /> changes to this MRP unless and until a�revi MRP sissued by the Executive Officer. <br /> Central Valley Water Board staff shall approve specific sa_rmple station locations prior to <br /> implementation of sampling activities. <br /> e <br /> All samples shoul be repres ntative of the volume andYnature of the discharge or matrix <br /> of materia! sampled. The time;�a <br /> te, and location of each grab sample shall be recorded <br /> on the sample chain of q:stod rm. <br /> On 17 Apel 2013, th°e Dischargers equested mtodifications to the MRP requirements to <br /> include the BSW treatment system monitorgrequirements. The Discharger also <br /> proposed to change the mpliandzone to gauge the background/baseline outside the <br /> treatment zoe by changin• the des gnated compliance wells. MRP modifications were <br /> also proposed to clarify the documentmaintain consistency with other site documents, <br /> and avoid overlap ' ith a second MRP for site groundwater (MRP-No. R5-2004-0800). <br /> GRO N ,WARTER TREATMENT SYSTEM MONITORING <br /> The revised monitoring program for the groundwater treatment system and the J.R. <br /> Simplot backup supply wellhead treatment system shall follow the schedule provided in <br /> the attached Tables 1 using the analytical methods listed in Table 2. <br /> Table 1 lists all sampling locations and the sampling frequency. Table 2 lists the <br /> sampling constituents, analytical methods, and maximum practical quantitation limits. <br /> Sample collection and analysis shall follow standard EPA protocol. If necessary, <br /> equivalent analytical methods may be used with the concurrence of the Central Valley <br /> Water Board staff. <br />