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Street Address Permit Date Work Performed <br /> 1 . 18446 Walnut 01/09/80 Install leach field and sump <br /> _ 03/8-7 Add seepage pit , 15 ' x 2 ' x 18 ' <br /> 2 . 18490 Walnut 06/04/74 Add 50 ' of leach line and <br /> 25 ' x 33" pit <br /> 3 . 18418 Almond 06/03/85 Add 40 ' of leach line and <br /> 2 ' x 10 ' x 12 ' pit <br /> 4. . 18465 Almond 05/19/75 Add 40 ' of leach line and <br /> 25' x 33 ' pit <br /> 5 . 18470 Almond 06/06/73 Add 100 ' of leach line <br /> 6 . Almond & Athearon 06/17/60 Add three leach lines , <br /> 1 @ 100 ' , 2 @ 40 ' <br /> It can be seen from the above records that the existing <br /> .. single family residences adjacent to the proposed project utilize <br /> septic systems with either leach lines and/or seepage pits . <br /> V. GROUND WATER DEPTH AND SOIL CLASSIFICATION <br /> The San Joaquin County Semi-Annual Groundwater Report <br /> (Spring, 1990 ) indicated that the depth of the groundwater in <br /> the project area is approximately 130 to 140 feet . Soil Survey <br /> Maps by the U. S . Soil Conservation Service were examined and <br /> identified 3 soil types within the project boundaries : ( i ) <br /> (HH) - Tokay fine sandy loam, ( ii ) (MHC) - Ramoth sandy loam, and <br /> ( iii ) (MAA) - Madera-Alamo complex. Soil descriptions of these <br /> _ soil types indicated the possibility of cemented or hardpan <br /> layers with permeabilities varying from moderately rapid to very <br /> slow. It was also indicated that permeability limitations for <br /> septic tank absorption fields can be overcome by increasing the <br /> size of the absorption fields . <br /> VI . SOIL PROFILE AND PERCOLATION TESTS <br /> Two test holes were excavated to depths of 3 . 0 feet in the <br /> areas of the proposed homesites . The purpose of the test holes <br /> was to determine percolation rates in these areas . For <br /> approximate location of the test holes , see the Tentative Parcel <br /> Map in the Appendix. Holes were prepared in accordance with <br /> County standards . <br /> Generally the surface soils consisted of silty sand. The <br /> soil was classified based on a visual inspection. As shallow <br /> percolation tests proved adequate for conventional septic <br /> systems , no further soil exploration was necessary. <br /> 2 <br />