SITE INFORMATION AND CORRESPONDENCE_1

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I n tr i Del Monte Foods One Market � P.O. Box 193575 San Francisco, CA 94119-3575 Steven P.Ronzone Telephone: (415) 247-3000 Directoraeal Estate&Facilities,-,` (415)247-3520(Direct) - - (415)247-3540(Facsimile)..9A Y^ CV W August 10, 1999 Ronald Rowe, Sr.REHS San Joaquin County Public Health Services CP LOP/Site Mitigation Unit Environmental Health Division 304 E. Weber Ave., Third Floor Stockton, CA 95202- Re: 5202Re: Disco Site, 110 Filbert.Street, Stockton, CA 11 February 1999 Quarterly Monitoring Results. Dear Ron: Enclosed please find an amended February 1999 Quarterly Groundwater Monitoring Report for the Disco Site. This reportwas originally submitted in May 1999, however, it is being resubmitted in order to address.comments contained''in your July 7, 1999 letter: Quarterly Monitoring Report Review, Response to Request to Discontinue, Oxygenate Analyses and Quarterly Sampling. The report has been modified with the following items: • A signature page and stamp stating the report has been prepared under the supervision of Registered Geologist, Keith Sheetz/CH2M HILL,R.G. #6888. • The section under Groundwater Elevation Data has been'expanded to explain why water level measurements were not collected from piezometers NP-1-70', -80' and —90' during the February sampling event. Calculated vertical gradients based on water level data from t well pairs MW-DIS-7S and-7D, and MW-DIS-8S and 8D are also added and included in Table 3. • The Analytical Results section has been organized based on monitoring well location. Results.are reported under subsections of Upgradient Wells, Cross-Gradient Wells, or Wells Within the Plume. • A Conclusion section has been added to the report to summarize current and past conditions at the site.