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INTRODUCTION Quality Assured Packing, Inc. (QAP) has been processing and canning tomatoes since 1985 at a plant northeast of Stockton. Wastewater has been disposed of by treating, screening and separation methods before using it to surface irrigate fields near the plant. Initially, the plant processed tomatoes exclusively. In order to accommodate local apricot producers and extend the annual plant operation schedule, apricot processing was initiated in 1988. Apricots were processed from mid-June to mid-July, effectively extending the plant operation schedule one month. QAP has made a concerted effort to maintain and improve its wastewater disposal system since canning commenced in the 1985 season. Nevertheless, the land disposal of wastewater at the plant has been the subject of complaints from neighbors concerned with odors. A technical report and operating plan prepared by Nolte and Associates addressed the odor problem. The technical report was submitted to the Regional Board on September 16, 1988. y The California Regional Water Quality Control Board Order No. , 88-094 stipulates that QAP will provide an analysis of the potential for groundwater impacts due to the elevated total dissolved solids content of its wastewater. In addition, the Regional Board's Cease and Desist Order No. 88-152 specifically requested that the issue of groundwater impacts of wastewater disposal be addressed. This report will cover the geohydrology and land use in the vicinity of QAP. A site specific section view of the aquifer system directly below the plant is presented based on boring logs and water quality data. In the context of the overall site geohydrology, the impacts of wastewater disposal on groundwater quality are assessed. BACKGROUND General QAP is located on North Bozzano Road at the northeast edge of Stockton as shown in Figure 1. The QAP plant site and the land presently irrigated by plant wastewater have been used for irrigated agriculture since early in this century (1) . Field crops such as sugar beets, kidney beans, wheat, tomatoes and field corn have predominated in the last twenty to thirty years. Truck crops have been grown historically. Since most of the land surrounding QAP is in small parcels it is possible that a local trend toward truck crops for the fresh vegetable market could result in a return of truck crop production to the area. Orchard crops are also common. Presently a portion of the area irrigated by wastewater from QAP is in walnuts. 1-1 RP033-L