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<br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD
<br /> CENTRAL VALLEY REGION
<br /> MONITORING AND REPORTING PROGRAM NO. R5-2002-0826
<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 are
<br /> Polluted with nitrate compounds, volatile organic compounds, chlorinated herbicides, and fumigants
<br /> from releases to former ponds and operations at the site. There are three water bearing zones: the first
<br /> aquifer is about 45 to 65 feet below ground surface (bgs), the second aquifer is about 85 to 110 feet
<br /> bgs, and the third aquifer is about 150 to 175 feet bgs.
<br /> This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California
<br /> Water Code and is necessary to delineate groundwater pollutant plumes and determine whether
<br /> remediation efforts are effective. Existing data and information about the site shows the presence of
<br /> various chemicals, including nitrogen compounds, chloroform, methylene chloride, tetrachloroethene,
<br /> bromodichloromethane, 1,2,3-trichloropropane, 1,2-dichloropropane, dibromochloromethane, dinoseb,
<br /> 2,4-dichlorophenoxyacetic acid, 1,2-dibromoethane, and 1,2-dibromo 3-chloropropane emanating from
<br /> the property under the control of the Discharger. The Discharger shall not implement any changes to
<br /> this MRP unless and until a revised MRP is issued by the Executive Officer. This MRP replaces the
<br /> requirements listed in MRP No. 96-816, 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 wells
<br /> shall be added to the monitoring program and shall be sampled and analyzed according to the schedule
<br /> 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 subsequent to
<br /> the issuance of this MRP, shall follow the schedule below. Monitoring well MW-8 and extraction well
<br /> E-2 are near wells screened in the same or comparable intervals and therefore are not sampled. These
<br /> wells are not schedule for abandoning because they maybe used for remedial purposes. Sample
<br /> collection and 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-1413, MW-1,MW-3,MW-7,
<br /> MW45A,MW-15B,MW-16A,MW-1613,MW-17A,MW-1713, MW-12,MW-13A,
<br /> MW-18A,MW-1813, E-11 new wells3 MW-13B
<br /> All wells will be monitored semi-annually for water levels. Semi-annual sampling will occur during the first and
<br /> third quarters.
<br /> 2 Wells will be sampled annually during the third quarter.
<br /> 3 New wells may be sampled semi-annually only after one year of quarterly monitoring is completed.
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