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..w July 24,2003 Job Number: LG03-201 Page 7 was to maximize the chances that each parcel would achieve satisfactory percolation tests. See Plate 1 for the locations of the percolation tests. Z For each percolation test boring, two inches of"pea gravel" was placed in the bottom of the holes. The casing, a 2-inch PVC pipe with holes drilled in the bottom, was installed, and 2 •- to 3.5 inches of"pea gravel" was backfilled in the annular space. The percolation holes were .3 7 pre-soaked and a short preliminary test was conducted on July 3, 2003 to determine whether a 1 hour or 4 hour test was required. Based on preliminary tests, 4 hour tests were conducted in the L 2 shallow holes, while 1 hour tests were performed in the deep holes. The percolation tests were conducted on July 3, 2003 in accordance with the requirements of San Joaquin County Environmental Health Department. The last V2 hour of the test was observed by Mr. Michael Escotto, of that office. The percolation test performed in both the shallow and deep holes on the south parcel resulted in percolation rates of 5.56 minrin(3-ft and 25-ft depths). The north parcel percolation tests resulted in percolation rates of 62.5 min/in (3-ft depth) and 5 minrn(25-ft depth). A satisfactory percolation rate is 60 min/in or less for a three foot hole or 30 min/in or less for a deep hole. A satisfactory percolation rate was achieved on both the north and south parcels. VII. CONCLUSIONS AND RECOMMENDATIONS In conclusion, satisfactory percolation rates were achieved on the north and south parcels of the subject property. No ground water was encountered in the borings and the depth to ground water, according to a recent San Joaquin County Flood Control and Water Conservation District ground-water map, is about 95 feet below the ground surface at the site. Based on the results of this study, we have found the soils to be suitable for septic (S , systems consisting of leach lines and seepage pits for both proposed parcels. We believe that .� 2 due to the proposed uses and sizes of the parcels, the use of the septic systems will not negatively impact the ground water quality of the area. VIII. LIMITATIONS The conclusions of this report are based on the information provided regarding the existing and proposed development,the use of the subject property, and the site conditions as they existed at the time we excavated our test holes and performed the percolation tests. It was pE RSO 1,.s OL♦ 1�