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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2008-0817 CALIFORNIA WATER CODE SECTION 13267 FOR WESTERN FARM SERVICE, INC., AND AGRIUM STOCKTON FACILITY SAN JOAQUIN COUNTY The agricultural chemical facility at 1905 North Broadway Avenue in Stockton was owned by Unocal until February 1993, when the facility and its environmental liability was purchased by Agrium (Discharger). The soil and groundwater are polluted with fertilizers, fumigants, pesticides and herbicides that were discharged to on-site ponds. Polluted groundwater is found at about 50 feet. 100 feet, and 150 feet below ground surface. This pollution impaired the beneficial use of this water resource. The ponds were excavated and covered with an engineered cap and liner. A pilot study is underway evaluating the efficacy of zero-valent iron to remove groundwater contaminants insitu. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and is necessary to delineate groundwater pollutant plumes and determine whether remediation efforts are effective. Existing data and information about the site show the presence of various chemicals, including 1 ,2-dichloropropane. 1 .2,3-trichloropropane.. nitrate and ammonium. emanating from the property under the control of the Discharger. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer This MRP replaces the requirements listed in MRP No. R5-2004-0804, which was issued on 29 January 2004 Prior to construction of any new groundwater monitoring or extraction wells. and prior to destruction of any groundwater monitoring or extraction wells. the Discharger shall submit plans and specifications to the Board for review and approval Once installed, all new wells shall be added to the monitoring program and shall be sampled and analyzed according to the semi-annual schedule below. GROUNDWATER MONITORING As shown on Figure 1. there are 17 monitoring wells, one extraction well and two pilot study test wells in the A-zone (MW-1. MW-2, MW-3, MW-5, MW-6, MW-8, MW-9. MW-10, MW-12, MW-13A, MW-14A, MW-15A, MW-16A, MW-17A, MW-18A, MW-19A. . MW-20A, E-1 , PM-1 and PM-2); eight monitoring wells and one extraction well in the B-zone (MW-13B, MW-14B, MW-15B, MW-16B, MW-17B, MW-18B, MW-19B, MW-20B, and E-2); and two monitoring wells in the C-zone (MW-7 and MW-21). The groundwater monitoring program for the 27 monitoring wells, two extraction wells, two pilot study wells. and any wells installed subsequent to the issuance of this MRP, shall follow the schedules below in Tables 1 and 2. Analytical suites are found in Table 3 Groundwater elevation shall be recorded and field parameters such as electrical conductivity. pH and temperature shall stabilize and be recorded prior to sample