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R. W. SIEGFRIED & ASSOCIATES <br /> 4045 CORONADO AVENUE STOCKTON,CALIFORNIA 95204-2396 <br /> Telephone(209)943-2021 FAX Telephone(209)942-0214 CONSULTING CIVIL ENGINEERS <br /> ROBERT W.SIEGFRIED SUBDIVISIONS <br /> JAMES F.YOST MUNICIPAL <br /> WAYNEIMPROVEMENTS <br /> ROBERT <br /> M.WEST April i l 2 19 9 2 <br /> ROBERT G.CELUM P cy STRUCTURES <br /> LEX A.CORRALES BUILDING DESIGN <br /> LYNN M.SUTTON _ SURVEYS <br /> STEPHEN R.THUMLERT D c ��{ <br /> ALAN E.LIN DE <br /> San Joaquin County �` - <br /> Public Health Services APR 3 1992 3f <br /> r*4 <br /> Post Office Box 2009 ENVIRONMENTAL iEALTH <br /> Stockton, California 95201 PERMIT/SERVICES <br /> Attention: Mr. Jim Miller t <br /> Gentlemen: t <br /> Subject: A.P.N. 086-410-07 <br /> Variance Application (VR-92-2) <br /> Soil Suitability Study (Up-dated) <br /> This Soils Suitability Study supersedes a previous Study dated <br /> January 23 , 1992 , submitted by the undersigned. <br /> The property covered by the subject Application comprises <br /> approximately 1 . 64 acres at 8421 North Helen Lane. The site is <br /> located within Section I of the C.M. Weber Grant. This property <br /> and the surrounding area are zoned AG-40 (Agricultural) . The <br /> topography of this location is very flat with a gradient of <br /> approximately 0. 0008 , sloping west to east. There are no existing <br /> waterways or drainage channels crossing the property; however, the <br /> former course of the Calaveras River followed along the west <br /> property line of the subject property. The old course of the <br /> Calaveras River is not considered an ephemeral stream. <br /> The topographic soils map prepared by the University of <br /> California, Berkeley, indicates the site is largely covered by <br /> Columbia very fine sandy loam. For over forty (40) years, the <br /> subject property has been the site of a single family residence <br /> located on Parcel 1 as shown on the attached Site Plan. The latest <br /> San Joaquin County Water Conservation District Maps reveals the <br /> standing water level of the subject site slopes northeast to <br /> southwest at a depth of approximately one hundred and five (1051 ) <br /> feet. This relates to a groundwater elevation of approximately 60 <br /> feet. <br /> Attached is a copy of percolation tests performed on March 18 , <br /> 1992 , by R. W. Siegfried & Associates, Consulting Civil Engineers. <br /> Both test holes reveal that the surface soils are underlain by <br /> slightly clayey sandy silt soil at a depth of approximately three <br /> (31 ) feet. The observed percolation rates are 3 . 79 and 5 . 95 <br /> minutes per inch for Test Holes 1 and 2 , respectively. <br /> (Cont'd) <br /> C:VAJILT4572.RGC <br />