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photo and on soils maps the streambed is riot <br /> evident on the ground. Ultimately Mosher <br /> Creek enters Disappointment Slough in the <br /> San Joaquin Delta about 7 miles to the west. <br /> Mosher Creek is leveed and according to Army <br /> Corps of Engineers the site has 100 year flood <br /> protection, although a standard project, flood, <br /> a flood much greater in extent and more unlikely, <br /> would flood the area south of Mosher Slough. <br /> According to the flood profiles in Plate 21 <br /> of the Corps of Engineers report. Streambed <br /> is at 30' msl datum at mile 9.0 (near the <br /> center of the site) and at 34' msl datum at <br /> the Central California Traction Company rail- <br /> road crossing. <br /> Mile 9.0 CCT Crossing Flow CFS. <br /> Streambed 30' 34' At Hwy 99 <br /> 100 year flood 34' 38' 400 CFS <br /> Standard Project Flood 38' 41' 10000 CFS <br /> in addition to floodflows, the impervious soil <br /> and lack of slope cause minor drainage problems <br /> in the Morada area. Due to the lack of slope <br /> even slight topographic changes caused by road- <br /> building etc, can entrain water and subject <br /> areas to shallow ponding. <br /> 4, Subsurface Hydrology <br /> According to San Joaquin County Public works <br /> records, depth to water is about 70'-80' . <br /> The water table is' dropping at a rate of <br /> several feet per year. Furthermore the influx <br /> of saline water from the west due to groundwater <br /> overdraft and lack of surface water outflow <br /> have caused saltwater intrusion in the underground <br /> aquifers. If carried far enough this problem <br /> could eliminate pond water as a domestic water <br /> source. <br /> 5. Atmospheric Conditions (see Appendix B ) <br /> The Council of Governments "Noise Element" indi- <br /> cates that the California Traction Company rail- <br /> road line is a problem noise route. However, the <br /> traffic on this railroad is neither frequent nor <br /> high speed. <br /> -6- <br />