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.o► <br /> File No. 20-3876-01.G01 KLEINFELDER <br /> June 14, 1995 <br /> relatively tall weeds and grasses. The surrounding area contained pasture and farmland with <br /> ranchettes. <br /> On May 30, 1995, a representative of our firm visited the resident living on parcel A at the site. <br /> This resident is the son of the historic property owners. The purpose of the visit was to obtain <br /> information regarding septic system use and to inquire about any problems known to exist with <br /> this method of sewage disposal. The resident reported having no problems with the performance <br /> of their existing septic system or previous systems on the property. He also indicated that their <br /> domestic well produced "good" quality water. <br /> Our representative also performed a review of San Joaquin County septic system permit records. <br /> The records do not contain any recent permits (within the last 15 years) for septic system repairs <br /> for residents located in the site area. <br /> Item d-2: <br /> "The suitability of the soil for utilizing septic systems, including percolation rates and soil <br /> profiles;" <br /> On May 30 1995, representatives of our firm drilled and set up percolation tests <br /> between depths of approximately 3 and 25 feet on each parcel. The test holes <br /> were drilled with a truck-mounted drill rig equipped with 6-inch diameter, <br /> continuous-flight augers. Perforated PVC pipe was inserted into the test holes to <br /> prevent disturbance when adding water. The test holes were filled with 3 to 4 <br /> feet of relatively clean water and left to soak overnight. <br /> On May 31, 1995, our representative returned to the site to perform the <br /> percolation tests. The tests that were producing the fastest percolation rates were <br /> performed per County guidelines for a period of 4 hours. Those tests consisted <br /> of a 9-foot deep test on parcel A, a 24-foot deep test on parcel B, a 4-foot deep <br /> test on parcel C, and a 15-foot deep test on parcel D. The tests were performed <br /> at the approximate locations shown on Plate I. The last 30 minutes of each test <br /> were used to calculate the percolation rates. <br /> In order to use standard leach lines, the County requires that a percolation rate <br /> of 60 minutes per inch be obtained at the approximate 3-foot depth. In order to <br /> use sump pits, a soil strata with a pe-colation rate of 30 minutes per inch, or <br /> faster, must be located within 25 feet of the surface. The following table presents <br /> a summary of the passing percolation tests obtained on each parcel. The County <br /> approved percolation test sheets are included with this report. <br /> Copyright 1995 Klcinfelder, Inc. Page 2 of 4 <br />