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11 <br /> March 6,2001 <br /> Job Number: LG00-426 F <br /> r ` <br /> Page 6 <br /> mentioned that a septic system operating under heavy use during canning season-may have some <br /> impact on water quality. <br /> If one takes into account that ground-water flow directions and gradients'fluctuate <br /> seasonally;the high concentration of nitrate may originate relatively close to the on-site well. <br /> One or more of the following nitrate sources may contribute to the high nitrate concentration <br /> measured in.the on-site water well. 1)portion from the regional nitrate plume, 2) the on-site <br /> septic system, 3) possible nitrates in the irrigation ditch water to the west of the.-subject site, or <br /> possibly 4) from cannery operations because they are a large quantity disposer of waste water <br /> and septic waste located close to the site. <br /> VI. GEOLOGY, SOIL,AND PERCOLATION TEST <br /> h <br /> The geologic literature'indicates that the surficial deposits near the site are the Pleistocene <br /> age (about 10,000 to 2-million years old) Modesto Formation(Plate 6). The Modesto Formation' <br /> is generally composed of river alluvium, alluvial terraces, and'abandoned channel ridges.' The <br /> Modesto Formation consists of tan and light-gray gravely sand, silt, and clay.' During our <br /> investigation, the Modesto Formation consisted mostly of sandy silt, silty,sand, with occasional <br /> minor sand layers. Clay soils were encountered at the surface. <br /> The surface.soils'located at the proposed project location were identified as the Stockton <br /> Clay by the San Joaquin Soil Survey report.'Table 3 presents some general engineering' <br /> properties for the given soil. <br /> ' Marchland,D.E.,and Atwater,B.F., 1979,Preliminary Geol.ogic Map-Showing Quaternary Depostis of <br /> the Lodi Quadrangle,California:U.S.Geologic Survey Open File Report 79-933. Scale 1:62,500. <br /> �d <br /> pE S fOs <br /> - x <br /> T <br /> Iry` <br /> • .Ir <br /> _- <br />