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MONITORING AND REPORING PROGRAM NO. R5-2012-0106 • GLENN SPRINGS HOLDING COMPANY,FORMER OCCIDENTAL CHEMICAL COMPANY -4 GROUNDWATER REMEDIATION PROJECT, LATHROP FACILITY SAN JOAQUIN COUNTY GROUNDWATER INJECTION SYSTEM MONITORING The injection aquifer is overlain by a thick confining layer of relatively impermeable clay (referred to as the Corcoran clay). Treated groundwater by the treatment system is discharged beneath the Site in' wells located both above and below the Corcoran clay. Flow distribution of the treated groundwater is not controlled by any means other than the natural receptivity of the injection wells and hydrogeologic characteristics of the . confined aquifer. The injection system operation must comply with the WDR issued for the Site. Attached Table 3 lists the injection wells and the sampling frequency. Table 2 lists the sampling constituents analytical methods, and the maximum practical quantitation limits. Sample collection and analysis shall follow standard EPA protocol. COMPLIANCE WELL GROUNDWATER MONITORING Monitoring of the compliance well shall be conducted according to the frequency listed in Table 3, and using methods listed in Table 2, which includes the sampling constituents, analytical methods, and the maximum practical quantitation limits. Sample collection and analysis shall follow standard EPA protocol. if necessary, equivalent analytical methods may be used with Central Valley Water Board staff concurrence. FIELD SAMPLING In addition to the above sampling and analysis, field sampling and analysis shall be conducted each time a monitor well or extraction well is sampled. The sampling and analysis of field parameters shall be as specified in Table 4 as follows: Table 4: FIELD SAMPLNG REQUIREMENTS Parameters Units Groundwater Elevation Feet, Mean Sea Level Electrical Conductivit mhos Dissolved Oxygen m IL H H Units to 0.1 units Tem erature 0C Extraction Rate GPM Pur a Rate GPM Turbiditv NTU Total Gallons Pur ed Gallons Water Level ft MSL 1.This applies only to extraction wells. 2.This applies only to monitoring wells.