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CALIFORNIA REGIONAL'WATER QUALITY CONTROL BOARD
<br /> CENTRAL VALLEY REGION
<br /> MONITORING AND REPORTING PROGRAM NO. 96-817
<br /> OCCIDENTAL CHEMICAL COMPANY
<br /> J.R. SIMPLOT COMPANY, PUREGRO COMPANY,
<br /> AND VOLPI RANCH
<br /> 1904 W. CHARTER WAY, STOCKTON
<br /> SAN JOAQUIN COUNTY
<br /> A soil and ground water investigation is currently underway at a former retail fertilizer facility at
<br /> 1904 W. Charter Way, Stockton. The facility has been operated by Occidental Chemical, J.R.
<br /> Simplot, and PureGro; it is owned by Volpi Ranch. Currently, there are 12 monitoring wells onsite
<br /> and three wells offsite, as shown in Attachment A. Monitoring conducted since March 1995 has
<br /> shown that the groundwater beneath the site contains triazine pesticides, organophosphorus
<br /> pesticides, carbamates, fumigants, phenoxy herbicides, volatile organics, and nitrogen products.
<br /> Upon request, plans and specifications for remediation of the soil and ground water shall be
<br /> submitted to the Board for review and approval prior to construction activities. Any monitoring
<br /> well(s) constructed after the date of this Order shall be sampled and analyzed as directed below, and
<br /> added to the monitoring program.
<br /> GROUND WATER MONITORING
<br /> The ground water monitoring program for the wells shown in Attachment A, and any additional
<br /> wells installed after the date of this Order, shall include the constituents listed below'. The
<br /> collection of quality assurance/quality control samples, and the method of sample collection, shall
<br /> follow the approved Quality Assurance Project Plan (QAPP). The depth to ground water in all
<br /> wells shall be measured and recorded before any of the wells are purged.
<br /> EPA Analytical Yearly
<br /> Constituents Units Method Sampling Frequency
<br /> Depth to ground water 0.01 feet -- April, August, December
<br /> Volatile organics µg/1 EPA 8010 April, August, December
<br /> Organophosphorus pesticides a g/1 EPA 8140 April, August, December
<br /> Chlorinated herbicides µg/l EPA 8150 April, August, December
<br /> Triazines Kg/1 EPA 8141 April, August, December
<br /> Carbamates a g/l EPA 8321 April, August, December
<br /> Fumigants (DBCP, EDB) µg/1 EPA 8011 April, August, December
<br /> Nitrate-N m g/1 EPA 300 April, August, December
<br /> Ammonia-N mg/1 EPA 350.1 April, August, December
<br /> Total Kjeldahl nitrogen mg/1 EPA 351.3 April, August, December
<br /> Total dissolved solids mg/l EPA 160.1 April, August, December
<br /> 'The first monitoring event for any monitoring well installed after the date of this Order shall include all of the
<br /> constituents listed in the table, and also organochlorine pesticides (EPA 8080). If organochlorines are not detected in the
<br /> first monitoring event, then it is not necessary to include this scan in subsequent events. However, if organochlorines
<br /> are detected, then this scan shall be included for that well.
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