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April 20, 2004 <br /> NOA Project plumber: E04002A <br /> Page 7 <br /> i <br /> a - DBCP is a nematocide and soil fumigant for vegetables, and grapes. it is thought to cause health <br /> problems consisting of kidney damage, liver damage, and cancer. The use of DBCP was <br /> discontinued In 1979.,The Environmental Protection Agency(EPA) set the maximum <br /> contaminant limit(MCL) at 0.2 parts per billion (ppb)because the EPA believes that given <br /> present technology and resources; this is the lowest level to which water.systems can reasonably <br /> be required to remove this contaminant should it occur in drinking water. <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> "5.1 Geology. - <br /> The geology at the subject Site consists of th <br /> g gy ] e Modesto Formation and River Bank Formation. <br /> These map units represent arkosic.alluvium forming Mokelumne River terraces and alluvial fans. <br /> F1 <br /> _These <br /> alluvium consists of gravel,sand, silt, and clay,including flood.plane deposits. - <br /> 5.2 Soil Properties in the Vicinity <br /> The Site-is located on San Joaquin Loam thick surface,q _ f , 0 to 2 percent slopes (Plate 8)_ This map <br /> unit is described as moderately well drained and-moderately deep to a hardpan. It formed in <br /> alluvium derived fromgranitic rock sources. Selected soil properties for.this map unit are _- <br /> summarized in the following table. <br /> Table 3.7 <br /> San Joaquin County Soil Survey— <br /> 'Selected Soil.Pro erties of On-Site Soils. <br /> ^ Soil Name Depth Unified Soil Classification SalinityF Soil Perme--- _-Septic tank <br /> -and Map (in) = mmhoslcm Reaction ability _- absorption <br /> Symbol .:_' _ _ _ :.pH in/hr fields <br /> F1 <br /> San: 0-12 Loam,CL-ML,ML. <2 5.6-6.5 0.6-2.0 i Severe: <br /> Joaquin 1,2-26 Sandy clay Loam SC. _= _ <2 6.1 7.3 0.2-0.6. cemented <br /> loam,240. 26-35_ Sandy loam,clay, CL. <2 6.1-7.8 <0.06 pan,peres f <br /> 35--60- "Indurated. - --- slowly. <br /> -Note:The table descriptions do not necessarily reflect site-specific soil properties. - <br /> FThe soil survey indicated that the on-site soil unit is composed of loam, clay, and clay loam soils. <br /> Clayand clay loam soils typically exhibit poor.percolation properties and are often problematic <br /> for shallow trench septic systems. <br />