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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION REVISED MONITORING AND REPORTING PROGRAM NO. R5-2015-0012-003 FOR IN-SITU GROUNDWATER REMEDIATION AND DISCHARGE OF TREATED GROUNDWATER TO LAND DIAMOND FOODS INC. 1050 SOUTH DIAMOND STREET, STOCKTON SAN JOAQUIN COUNTY This revised Monitoring and Reporting Program (MRP) describes requirements for monitoring the progress of an expanded Pilot Study using calcium polysulfide and chase water as an in-situ application to reduce hexavalent chromium to trivalent chromium at Diamond Foods Inc., 1050 South Diamond Street, Stockton, California. This MRP is issued pursuant to Water Code Section 13267. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. As appropriate, California Regional Water Quality Control Board, Central Valley Region (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. GROUNDWATER MONITORING There are six monitoring or observation wells associated with the Pilot Study at this site, including MW-5, MW-7, MW-8, MW-10, OBSVV-S, and OBSVV-D. The locations of these wells are shown on Figure 3. 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. Sample collection and analysis shall follow standard EPA protocol and sample analyses shall be completed by a California state-certified laboratory. The monitoring wells shall be sampled according to the schedule in Table 1 and the samples analyzed by the methods in Table 2, as follows: