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The Mall is located in a flood plain, so this must also be taken into consideration. Although it can be assumed that there may be decreased patronage of the Mall during the winter months, thus leading to a decrease in septic loading rates, design considerations should nevertheless take into account a very wet rainy season. Existing Systems in the Surrounding Study_ Area Records reviewed at the San Joaquin County Environmental Health Department indicate there have been many septic system failures within the surrounding one mile radius study area. We have copies of 28 - "Application for Sanitation Permits" for repairs/additions. Nineteen of the Applications were for additional leachlines and/or pits. The nine remaining Applications were for repairs. These documents illustrate a relatively high septic system failure rate considering the low density,of systems in the study area. These failures may be attributed to the high clay content, low permeability subsurface soils. The Mall project should take this data into consideration and design the lowest water volume for flushing and washing to Help alleviate potential overload problems. IV. LOCAL GROUNDWATER AND SURFACE WATER INFORMATION LGroundwater Termination of the exploratory boring at 50 ft below grade revealed no evidence of a saturated soil condition. Maps produced by the San Joaquin County Flood Control and Water Conservation District referenced as "Lines of Equal.Depth of Water Wells, Fall 1992" indicate groundwater is approximately 95 feet below grade. However, a water level measurement of a domestic well servicing the complex adjacent to the north of the project site at 3730 Wilson LWay indicated groundwater depth at 85 ft, 2.5 inches on July 9, 1993. From the County "Lines of Equal Elevation" maps, regional groundwater flow appears to travel in an east to northeasterly direction, although this direction can vary locally. L7 LVafley Ag Pfsearch