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July 5,2002 <br /> Job Number: LG02-168 <br /> F Page 4 .. <br /> V. GROUND WATER <br /> The Sari Joaquin County Flood Con`tr`ol and Water Conservation District' ground-water <br /> depth and elevation maps for Spring 1998 and for Fall 1998 indicates"the-most recent ground- <br /> water levels for San Joaquin County.=These,xnaps..were used to determine the general depth and , <br /> flow direction of regional ground water(Plates 2 through 5). ' Table,3 summarizes all the <br /> l available ground-water'inforrnation collected for the"site and nearby:are'a. <br />�`. Table 3,. <br /> Suiilmary of Available Ground Water•Information. <br /> f. Date,Description,Source . " Groundwater Depth Notes <br /> M <br /> " June.2,2002,one 25-foot deep soil boring, No ground water encountered to a <br /> i Neil O.Anderson&Associates,Inc. total depth of 25'feet. <br /> �k Fa111998, Sari Joaquin County Ground About 60 feet in depth. Gradient about 7.1 fthni," <br /> Water Map(Plates 2 and 4).- flowing northeast., <br /> Spring 1999. San Joaquin County Ground` About 50 feet in depth. ' Gradient about 4.2 ft/mi, <br /> } Water Ma (Plate 3 and 5).. flowin northeast. ' <br /> l The existing ori-site domestic water'well is located near the northwest corner of the <br /> f..+, <br /> ` building. Mr. Rackley indicated that a sanitary seal had bee' n'recently repaired on the-well and <br /> observed by a staff member of San Joaquin County Public Health Services, Environmental <br /> Health Division. No DBCP or niiratc testing of well,water was required by SJC PHS-EHD. <br /> VI. GEOLOGY, SOILS,AND PERCOLATION'TEST <br /> The surficial geology of the site is reported,to Holocene and/or upper Pleistocene <br /> alluvium of the Calaveras River and-vicinity(Plate 6).2 Essentially, the alluvium consists of <br /> recent and/or older-gravel,F sand silt an&clay mixtures depo sited by the Calaveras River. .. , <br /> San Joaquin County Flood Control and Water Conservation District,q D strict, 1999, Depth to ground-water map <br /> and ground-water_.ele'vation map for'Spring and Fall 1998. Published bi-annually;scale: 1 inch T 2,miles. <br /> ., z Atwater;B-F., 1982,Geologic maps of the Sacramento-San'Joaquin Delta,California:U.S.Geolog ical <br /> Survey Miscellaneous Field Studies map MF-1401, scale 1:24,000, " <br />