SU0004208 SSNL - Laserfiche WebLink

Home Browse Search

September 3,2003 Job Number:LG03-226 Page 5 v A shallow and deep hole were drilled on Parcel 3. The shallow hole was drilled to 3 feet 9 inches. The soils encountered were fine to medium silty sand. The deep hole encountered fine to 05.2 medium silty sand to a maximum depth of 25 feet. �S The purpose for drilling shallow and deep percolation test holes on each of the parcels was to - maximize the chances that each parcel would achieve a satisfactory percolation rate. See Plate 1 for the locations of the percolation tests. For each percolation test boring, two inches of"pea gravel"was placed in the bottom of hole. 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. Unsatisfactory documentation of the percolation tests performed on August 8, 2003, resulted in the need to retest the holes. A second set of percolation tests were conducted using the shallow holes on August 26, 2003. The shallow hole on parcel number 3 was allowed to run dry during the test; therefore, a third test was performed on the final hole on August 27, 2003. Due to the knowledge that the hole in question peres at a a sufficient rate, a one-hour test was employed. San Joaquin County EHD Inspector, Michael Escotto signed off on all of the final tests of the three parcels. The percolation holes � were pre-soaked on August 25, 2003 for the second round of tests. The percolation test 6 1_ performed on August 26, 2003 followed the previous day's test and therefore was sufficiently pre-soaked. The percolation test performed on Parcel 1 resulted in a percolation rate of 26.6 min/in (3-ft depth). The Parcel 2 percolation test resulted in percolation rates of 9.2 min/in (3-ft depth). The Parcel 3 percolation test(conducted on August 27, 2003)resulted in a percolation rate of 2.14 min/in (3-ft depth). A satisfactory percolation rate is 60 min/in or less for a three foot hole. A ` satisfactory percolation rate was achieved on all three parcels. 7.0 NITRATE LOADING STUDY 7.1 Introduction Because of the concern of nitrate leaching into ground water from new septic systems constructed on the parcels, a nitrate loading analysis was required by the EHD to measure the rocaso 1 � o � �Sspc�