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:. August 1,2002 Job Number: LG02-183 Page 7 The-percolation test casing was a 2-inch PVC pipe with holes'dri11ed ori the bottom. Two inches of"pea-gravel" was placer] in the bottom-of hole,the casing was installed, and several feet Of"pea gravel' was backfilled in the annular space. The percolation holes were pre-soaked and'a' short preliminary test was conducted on June 10,2002 to determine whether'a 1 hour OT,4 hour test was required. Based.on a preliminary test a one 1 hour test able; Both percolation test holes wee pre-soaked 24-hours prior.to the percolation test. A 4-hour percolation.test was conducted on June"I r, 2002 in accordance-with the requirements of San Joaquin County.Environmental Health Division. The last /2 hour'of the test was observed by Johnny Yoakum, R.E.H.S: of that office.. The Parcel 1 West percolation test resulted in a percolation rate of 19:2'mia/in (3-ft depth). The Parcel.I East percolation test resulted in'a percolation rate of 7:S minliri(3-ft depth): The Parcel 2 percolation- p ion test resulted in , a,percolation rate of 25 min/in (3-ft depth). A satisfactory percolation rate is 60 min/in or less, f rr A satisfactory percolation rate was achieved on each parcel. VII. CONCLUSIONS AND RECOMMENDATIONS Iri conclusion, a satisfactory percolation rate was achieved on eachparcel. The ground water quality_test for nitrate was measured at 13.4 mg/L as NO3 which is well below the EPA. maximum contaminate level of 45 mg/L as NO3. .DPCP was not detected in the water'sample. 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 43,0 feet below the ground surface at the site. Based on the results of this study, we have found the soils to be.suitable.for aseptic system consisting of leach lines and seepage pits for' each of.the.proposed parcels. We believe p iha't due to the proposed use and size of each parcel, the use of the septic system will not ' negatively impact the ground water quality of the area. We recomrriend that the deli n a ' g nd installation of the septic system follow the requirements established'by the San Joaquin County Environmental Health Division. n ,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 6 P •F. �I