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i r Working to Restore Nature 1710 Main Street Escalon, CA 95320 Phone (209)838-3507 July S, 1992 FAX (209)838-3509 R FM C CM Ms. Mary Meays �y San Joaquin County Public Health Services J U L 13 1992 Environmental Health Division P O Box 2009 ENVIRONMENTAL HEALTH Stockton, CA 95201 PERMIT/SERVICES RE: 1992 Second Quarter Groundwater Monitoring Activities/Remediation System Performance Report, Tri-Valley Growers, 26200 Nowell Road, Thornton, California Dear Mary This letter report updates RESNA Industries' (RESNA's) activities at Tri-Valley Growers' Thornton plant (Figure 1) during the second quarter of 1992 Activities during the quarter included monitoring of groundwater, sampling for dissolved hydrocarbons from two monitoring wells on site, operation and maintenance of the remediation system, analysis of samples from the treatment system influent (well MW4) and carbon filter effluent Remediation system operation began on May 13, 1991. On May 28, 1992, RESNA personnel performed a maintenance visit to repair a system malfunction Servicing consisted of replacing the three-way valve, the compressor motor unit, and repairing the safety shut-off system After the repairs were completed the system was functioning properly and pumping at a rate of 1 2 liters per minute Groundwater monitoring was conducted in Apnl, May, and June. Groundwater gradient maps reflect a depression created by pumping of the groundwater in monitoring well MW4 (Figures 2 through 4) The cone of depression around the pumping well and the area of influence are demonstrated in these maps. The water table has decreased approximately one foot each month since the previous quarter The pumping rate has been adjusted accordingly to pump the decreased volume The groundwater monitoring data is summarized in Table 1 Groundwater monitoring logs are included in Attachment I QM061992 SAY