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File No. 20-3551-01 lkg KLEINFELnER January 27, 1992 On January 15, 1992, a representative of our firm visited five residences located on and adjacent to the site. The l purpose of the visits was to obtain information on septic system use and to inquire about any problems known to exist with this method of sewage disposal. Residents were home at four of the locations, and they reported having no problems with the performance of their septic systems. The 4 residents ' opinions on the quality of water produced from their private wells varied from "hard" to "excellent" to "fair. " ITEM C-2 : "The suitability of the soil for development utilizing septic systems; " On January 14 , 1992 , a representative of our firm drilled and set-up four 3-foot deep percolation test holes at the approximate locations indicated on Plate I. The test holes were drilled with hand drilling equipment using a 6-inch diameter continuous-flight auger. Perforated PVC pipe was inserted into the test holes to prevent disturbance when adding water. The test holes were filled with relatively clean water and were left to soak overnight. Our representative returned to the site on January 15, 1992, f and water remained in all four test holes, which constituted--failing tests. 16 our representatives drilled and set-up do additional' percolation test holes in the vicinity of each—of -h'eY3-foot deep test locations. The additional f test holes varied from approximately 3 to 9-1/2 feet deep. The test holes were drilled with a truck-mounted drill rig equipped with 6-inch diameter continuous-flight augers. ` Perforated PVC pipe was inserted intthe test holes to prevent disturbance when adding water. The test holes were filled with approximately 3 feet of re atively clean water the day before testing and were left to soak overnigh� On January 21 a 22 , 19 our representative returned to he rm the percolation tests. As per San Joaquin County guidelines, the tests were performed for a period of 4 hours. The last 30 minutes of each test were used to calculate the percolation rates. In order to use standard leach lines, the County requires a percolation rate of 60 minutes per inch (min/in) , or faster, at the a- foot depth. One 3-foot deep test passed (Lot 3) with a percolation rate of 60 minutes per inch. In order to use sump pits, the County requires a percolation rate of 30 min/in, or faster, at a depth greater than 3 feet. The I Copyright 1992 KLeinfeLder, Inc. Page 2 of 4