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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD
<br /> CENTRAL VALLEY REGION
<br /> MONITORING AND REPORTING PROGRAM NO. R5-2002-_
<br /> FOR
<br /> WESTERN FARM SERVICE
<br /> FORMER PUREGRO AGRICULTURAL-CHEMICAL FACILITY
<br /> STOCKTON, SAN JOAQUIN COUNTY
<br /> In 1992, Western Farm Service(Discharger), a subsidiary of Agrium,purchased the agricultural
<br /> chemical facility at 1905 North Broadway Avenue in Stockton (site). The soil and groundwater
<br /> are polluted with nitrate compounds, volatile organic compounds, chlorinated herbicides, and
<br /> fumigants from releases to former ponds and operations at the site. There are three water bearing
<br /> zones: the first aquifer is from about 45 to 65 feet below ground surface(bgs), the second
<br /> aquifer is from about 85 to 110 feet bgs, and the third aquifer is from about 150 to 175 feet bgs.
<br /> This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the R
<br /> California Water Code and is necessary to delineate groundwater pollutant plumes and determine
<br /> whether remediation efforts are effective. Existing data and information about the site shows the
<br /> presence of various chemicals, including nitrogen compounds, chloroform, methylene chloride,
<br /> tetrachloroethene, bromodichloromethane, 1,2,3-trichloropropane, 1,2-dichloropropane,
<br /> dibromochloromethane, dinoseb, 2,4-dichlorophenoxyacetic acid, 1,2-dibromoethane, and
<br /> 1,2-dibromo 3-chloropropane emanating from the property under the control of the Discharger.
<br /> The Discharger shall not implement any changes to this MRP unless and until a revised MRP is
<br /> issued by the Executive Officer. This MRP replaces the requirements listed in MRP No. 96-816,
<br /> which was issued on 7 November 1996.
<br /> Prior to construction of any new groundwater monitoring or extraction wells, the Discharger shall
<br /> submit plans and specifications to the Board for review and approval. Once installed, all new
<br /> wells shall be added to the monitoring program and shall be sampled and analyzed according to
<br /> the schedule below.
<br /> GROUNDWATER MONITORING
<br /> As shown on Figure 1, there are 22 monitoring wells and two extraction wells. The groundwater
<br /> monitoring program for 21 monitoring wells, one extraction well and any wells installed
<br /> subsequent to the issuance of this MRP, shall follow the schedule below. Sample collection and
<br /> analysis shall follow standard EPA protocol.
<br /> SAMPLING FREQUENCY
<br /> Semi-annually' Annually2
<br /> Wells MW-2,MW-5,MW-6,MW-9,MW-10,MW-14A,MW-14B, MW-1,MW-3,MW-7,
<br /> MW-15A,MW-15B,MW-16A,MW-16B,MW-17A,MW-17B, MW-12, MW-13A,
<br /> MW-18A,MW-1813,E-1,new wells MW-13B
<br /> All wells will be monitored semi-annual for water levels. Semi-annual sampling will occur during the first
<br /> and third quarters.
<br /> 2 Wells will be sampled annually during the third quarter.
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