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w \ <br /> R.W. SIEGFRIED & ASSOCIATES <br /> CONSULTING CIVIL ENGINEERS <br /> ROBERT W.SIEGFRIED SUBDIVISIONS <br /> ARNOLD R.SCHAMBER January 15, 1991 MUNICIPAL <br /> JAMES F.YOST <br /> IMPROVEMENTS <br /> WAYNE M.WEST STRUCTURES <br /> ROBERT G.CELUM BUILDING DESIGN <br /> LEX A.CORRALES SURVEYS <br /> LYNN M.SUTTON <br /> STEPHEN R.THUMLERT REPLY TO: <br /> ALAN E.LINDE a STOCKTON <br /> San Joaquin County Public Health Services ā¯‘TRACY <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> Attention: Mr. Jim Miller <br /> Gentlemen: <br /> Subject: Minor Subdivision Application No. MS-90-134 <br /> Soil Suitability Study <br /> The property covered by the subject Application comprises <br /> approximately 276 acres at the southwest corner of Mariposa Road <br /> and Murphy Road. The site is located within the Southeast 1/4 of <br /> Section 32 , Township 1 North, Range 8 East and the Northeast 1/4 <br /> of Section 5, Township 1 South, Range 8 East, Mount Diablo Base <br /> and Meridian. <br /> This property and the surrounding area is zoned AG-40 <br /> (Agricultural) . The topography of this location is very flat <br /> with the gradient of approximately 0. 0008 sloping from east to <br /> west. Approximately 600 feet south of the intersection of <br /> Mariposa and Murphy Roads, a small drainage channel crosses <br /> Murphy Road and continues flowing across the northerly portion of <br /> the property in a westerly direction. <br /> The topographic soils map prepared by the University of <br /> California, Berkeley indicates the site is largely covered by <br /> Stockton clay (adobe) soils with smaller areas being covered by <br /> Landlow clay (adobe) soils. For several years, the subject <br /> property has been planted to vineyards. Prior to that time, the <br /> land was used for the cultivation of row crops or pasture. <br /> On March 12 , 1990, measurements were taken by Pacific Gas <br /> and Electric Company which revealed the standing water level of <br /> an irrigation well within the subject site to be at a depth of <br /> 115 feet. This relates to a groundwater elevation of <br /> approximately -50 feet. <br /> Attached is a copy of a percolation test performed on <br /> December 5, 1990 by R. W. SIEGFRIED & ASSOCIATES, Consulting <br /> Civil Engineers. This test hole reveals that the surface soils <br /> are underlain by sandy soils at a depth of approximately three <br /> (31 ) feet. The observed percolation rate was 10. 0 minutes per <br /> inch. <br /> C.1SMHILT6657-5.RGC <br /> MAIN OFFICE 4045 CORONADO AVENUE STOCKTON,CALIFORNIA 952042398 Telephone(209)943-2021 FAX Telephone(209)942-0214 <br /> TRACY BRANCH OFFICE 3120 TRACY BOULEVARD,SUITE D TRACY,CALIFORNIA 95378.1719 Telephone(209)835-5300 <br />