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• buildin4s on this and the adiacent property to the north Refer tf Figure 1 of Attachment 1 for details The project site is located easterly of the center of the Central Valley of California, also referred to as the southern portion of the Sacramento Valley. It lies about 1/2 mile westerly of the Mockeiumne River . The entire region is one of low relief, with elevations of about 90 ' locally . The shallow sediments that form the groundwater regime are composed of alluvial and flood plain interspersed sands, gravels , silts and clays of varying proportions They are usually soft to friable with local areas of greater cementation Hydraulic connection is widespread with common groundwater levels throughout the valley, although individual strata vary widely SOILS CLASSIFICATION' According to the publication, "Soils of San Joaquin County California, " June, 1952, University of California, the property is underlain by Hanford sandy loam, Soil Type 10 See Figure 2 for the area soil classifications and Attach- ment 5 for soil details DEPTH TO GROUNDWATER • Although two wells are located nearby, one within about 25 ' of the site in question, the exact depth to groundwater is not known The Spring 1990 edition of the San Joaquin Co Flood Control and Water Conservation District Map (Figure 3) shows groundwater to be found at about 90 ' below ground level (MSL elevation of 901 -- 0 ' from Figure 3 = 90 ' ) No moisture; was encountered when digging at 20 ' during the recent excavation Figure 5 , groundwater levels as of Fall , 1983 , a time of high groundwater levels in the area, shows the groundwater to have been about 85 ' below ground level (MSL elevation of 90 ' -5 ' from Figure 4 = 851 ) . MUNICIPAL AND MONITORING WELLS Owing to the relative isolation of the location in a country-farm environment, no wells other than the on-sight farm wells are nearby Figure 5 shows the locations of wells used for preparation of the groundwater level maps PRIOR HISTORY OF SITE The site has been part of a farming operation since the early 1900 ' s A 300 gallon gasoline tank, holding regular gasoline, was installed at an unknown date and used to fuel farm equipment prior to 1970 . As will be shown later herein, • the tank site had been used for a Japanese bath house and an abandoned cesspool was located immediately ad3acent to the tank site 2