Laserfiche WebLink
1-� <br /> B�] KLEINFELDER <br /> We do not know of any existing and/or potential groundwater contamination issues in <br /> c� <br /> the project vicinity. There are no existing gas stations or dairies adjacent to the <br /> property. Seasonal fertilization of the off-site agricultural land, if performed, and other <br /> T septic tank/leach field systems in the project area are probably the largest contributor <br /> Fiof nitrogen to groundwater in the project vicinity. <br /> 7. SOIL PROFILE <br /> The subsurface soil encountered in our soil profile boring consisted of brown, fine <br /> jj <br /> Ellgrained silty sand to a depth of approximately 6 feet below site grade, followed by fine �j,l <br /> grained relatively "clean" sand to a depth of about 12'/2 feet. The sand was underlain Z <br /> by sandy silt to a depth of about 13'/2 feet, followed by a strata of silty clay to the depth <br /> explored. <br /> The Soil Survey of San Joaquin County, California published by the U.S. Department <br /> of Agriculture, Soil Conservation Service (1992) refers to the near-surface soil within <br /> the western area of the project as belonging to the Bisgani Loamy Coarse Sand soil `7 <br /> series (Map Symbol 109) and the soil within the eastern area of the project as <br /> belonging to the Tinnin Loamy Coarse Sand soil series (Map Symbol 255). This soil is <br /> described as having "moderate" percolation characteristics for septic tank absorption. <br /> Other attributes are given in the table below: <br /> � <br /> OR <br /> Map I;� � I� " ,ilAvallable Water � . <br /> . Soil Name ' Cpacltyjl� �� PWS ;Organic <br /> Sym`bol :l . , � � � . Content, percent] <br /> uin 41 <br /> 109 Bisgani Loamy 0.06-0.08 7.4-8.4 1 1-3 <br /> J_ r <br /> Coarse Sand <br /> 255 Tinnin Loamy 0.05-0.07 6.1-7.8., 1-2 <br /> Coarse Sand <br /> 8. PERCOLATION TESTING <br /> The result of our percolation test is presented below. A copy of our field percolation �, <br /> test result is attached. These results are uncommon in the Manteca area since the v/°N <br /> silty sand soils are generally more permeabl our opinion, the soils encouritered in <br /> i <br /> the test hole are most like partially cerfiented, and known locally as and pan". �s 1 <br /> Cemented soils occur often in the vallwy nd are usually relatively thin la sof "hard <br /> � x�' <br /> pan." It has been our experience that "hard pan" can be deTber--_re�pe�a=. <br /> r.r' 0 , to help <br /> improve percolation rates. The percolation test will have tder the <br /> observation of SJCEHD. <br /> Test, St Hole �[LPercolatton;Rate SJCEHD <br /> s 13I' r frtar uI(It 4'I Observe <br /> -...a. <br /> Number IDescrl tion,;, r . EE , , . d1 i� ; <br /> P-1 Silty Sand 3.2 id Not PeYes <br /> P <br /> 71324.G01/ST06R648 °� ! � l• al June 19,2006 O 2006 Kleinfelder,Inc. V W�t� Page 4 of 8 <br />