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File No. CO-9011-SOI <br /> August 27, 1990 <br /> We understand that the septic systems currently utilized for the three residences on the site have <br /> been working for some years on a trouble free basis. However, we are also aware of some problems <br /> with the septic system associated with Rocky's Restaurant located approximately 1/4 mile west of your <br /> proposed site. Available information, in addition to the percolation test results contained herein, <br /> offer explanation of the differences in the septic system performances. <br /> The subject site is located on a different soil than Rocky;s Restaurant. Soil Conservation Service soil <br /> maps show that the two soils are different. Rocky's Restaurant is located on Merced Sandy Loam with <br /> "good" drainage in the surface soil and "imperfect" drainage in the subsoil. The subject site is located <br /> on Hanford Sandy Loam characterized by "rapid" drainage in both the surface soil and subsoil. In <br /> addition, San Joaquin County mapped groundwater table elevations show that groundwater is <br /> significantly deeper on the subject site. The depth of groundwater on the subject site of 19 feet should <br /> allow a normal leach field to be installed as opposed to a mounded leach field associated with higher <br /> groundwater elevations and/or poorly draining soils. <br /> The land surrounding the subject site is vacant of structures and used for agricultural purposes. Thus, <br /> any offsite flow from the leach field would be expected to produce little, if any, impact on the <br /> neighboring properties. The groundwater gradient at the subject site is in an eastward direction thus <br /> inducing any offsite flow to occur in the direction of the corn filed adjacent to the eastern boundary <br /> of the site. <br /> Should you have any questions or desire further information concerning the above Soil Suitability <br /> Study, do not hesitate to contact the undersigned. We appreciate the opportunity to perform this study <br /> for you and would be pleased to perform any additional studies which you might require. <br /> Very truly yours, OQ�pFESS/0�9 <br /> EARTH SYSTEM CTLTANT1 <br /> . WAYNE S. SMITH Z <br /> C 28278 <br /> Wayne S. Smith,.Engineering Manager cr Exp: 3/31/94 <br /> C.E. 28278 * <br /> WSS:ks sj9�OF CAUF���\� <br /> Attachments: Log of Boring 1, Original Field Data Sheets <br /> Copies: 2 to Mr. Yousif Halloum <br /> 1 to Mr. Steve Sinnock <br />