SITE INFORMATION AND CORRESPONDENCE_FILE 2

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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2008-0149-029, Revision 1 FOR IN-SITU GROUNDWATER REMEDIATION AT SITES WITH VOLATILE ORGANIC COMPOUNDS UNIFIRST STOCKTON FACILITY SAN JOAQUIN COUNTY This Monitoring and Reporting Program (MRP) describes requirements for monitoring a pilot-scale treatment of groundwater using subsurface injections to stimulate biological remediation of volatile organic chemicals at 819 North Hunter Street in Stockton. This MRP is issued pursuant to Water Code Section 13267, and replaces the requirements listed in MRP No. R5-2008-0149-029, which was adopted on 25 May 2011. 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 As shown on Attachment A, there are 11 monitoring wells 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 as applicable. Sample collection and analysis shall follow standard EPA protocol. The monitoring wells, extraction wells, and/or injection wells shall be sampled according to the schedule in Table 1, the samples analyzed by the methods in Table 2, and pursuant to the monitoring objectives shown in Table 3, as presented on the following pages.