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i <br /> 1 <br /> i PLATE II is a portion of a USGS topographic map of the area <br /> Again, refer to prior reports for more details <br /> SOIL CLASSIFICATION <br /> According to the publication issued by the University of Calif , <br /> Berkley, in 1952 , The surface soils consist of Stockton Adobe <br /> Clay and Honcut Clay over Capay & Stockton These soils are <br /> derived from alluvial fans & floodplain deposits , they have good <br /> surface and intermediate subsoil drainage, with a Storie index of <br /> i56 <br /> DEPTH TO GROUNDWATER. <br />' The twelve (12) sampling events since placement of the wells <br /> reveal that the water table has ranged (averages) from a high of <br /> 15 40 ' in July, 1996 to a low of 22 20 ' in January, 1994 The <br /> 1 average depth to water during the December, 1996 sampling event <br /> was 16 17 ' bgl During work covered by this report, water was <br /> encountered at depths ranging from 14 ' to 16 ' bgl , which is in <br /> close agreement with the December, 1996 data <br /> BRIEF SUMMARY OF PRIOR WORK <br /> 1989 - Two (2) 1, 000 gallon UST' s, which had contained gasoline, <br /> were removed from the property Contamination was measured in <br /> soil samples taken from the site <br /> April, 1993 - three (2) 2" diameter groundwater monitoring wells <br /> were placed on the property Refer to WJH report titled "PROBLEM <br /> ASSESSMENT REPORT & RESULTS OF GROUNDWATER INVESTIGATION" , dated <br /> July 26, 1993 for details of work performed. TABLE I summarizes <br /> the results of soil sample analyzes from that work. <br /> December, 1993 - An extensive title search of the area to the <br /> north and west of the property was made in an attempt to locate <br /> possible offsite sources of contamination None were identified <br /> March, 1994 - A somal--gas vapor survey was conducted on the <br /> property in an attempt to define the limits of the plume and <br /> possibly identify other off-site sources of contamination The <br /> results of that survey revealed that only the test points in the <br /> northwest portion of the property, (where the removed UST' s were <br /> located, ) recorded any petroleum vapors . Refer to WJH report <br /> dated April 26, 1994 for more complete information. <br /> September 26 & 28, 1994 - Two additional groundwater monitoring <br /> 2 <br />