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File No. 20-3239-03 KLEINFELDER August 20, 1992 ITEMS C-1 AND C4: "The intensity and extent of the existing and the proposed development on septic tanks within and around the area;" (C-1). "The history of past uses in the project area to assess potential problems;" (C4): Reference is made to Plate I of this report which shows the location of the proposed Thorton Ranch Estates site. The majority of the site contains rice, with exceptions being a small pasture at the southwest corner of Edwards Avenue and Campbell Road and a few well and/or old building pads. The majority of the area surrounding the site contains rice and pasture with scattered residences. On July 15, 1992 a representative of our firm visited five residences located off Edwards Avenue and Campbell Road. In addition, on March 3, 1992, our representative visited three residences located off Dove Road for a previous study. The approximate locations of the residences visited are indicated on Plate 1. The 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. We were able to question residents at seven of the eight locations visited. Six of the residents reported no problem with their septic systems. The resident at location 4 reported that when they moved in approximately two years ago their toilets backed up. The leach lines were "repaired," the septic tank was pumped, and they have had no problems since. The septic tank at location 2 was replaced approximately five years ago because of old age. The majority of the residents indicated that their wells produced "hard" water. ITEM C-2: "The suitability of the soil for development utilizing septic systems;" On August 12, 1992, representatives of our firm drilled and set-up one approximate 3- to 91h-foot deep, and one approximate 131h- to 141/2-foot foot deep, one approximate 8- deep percolation test hole on six of the nineteen proposed parcels at the approximate locations indicated on Plate 1. The test holes were drilled with a truck-mounted drill rig equipped with 6-inch diameter, continuous-flight augers. Perforated PVC pipe was inserted into the test holes to prevent disturbance when adding water. The test holes were filled with approximately 3 feet of relatively clean water the day before they were tested and were left to soak overnight. On August 13, 14, and 17, 1992, our representative performed the percolation tests. As per San Joaquin County guidelines, the tests were performed for 30 minutes where water remained in the holes after the overnight soaking and for four hours where the holes were dry. The last 30 minutes of each test were used to calculate the percolation rates. In Copyright 1992 KLeinfelder, Inc. Page 2 of 5