SU0003955 SSNL - Laserfiche WebLink

Home Browse Search

SOIL EXPLORATION REPORT: A truck mounted drill rig was employed to drill to 25' in search of a stratum which could be tested for percolation. Approximately 10 holes were: drilled on the three parcels.No satisfactory layer of soil was found. The top 18" of clay support the grasses grown for pasture. The deeper the hole the more difficult the drilling. On Parcel 2, the drill could not reach a depth beyond 17'. A thin layer of dense cl.si.sd was located at 6'but very dense. Shallow tests were made at the 36- 42" depth on all three parcels. No evidence of a satisfactory layer was found on Parcel I & 3. On Parcel 2 the shallow hole was clay with some gravel mixed in. PERCOLATION TESTING On 5-8-02, percolation tests were made on Parcels I and 3. On 6-21-02 the percolation test was conducted on Parcel 2. The tests were performed in accordance with the requirements of the San Joaquin County Environmental Health Department. The field percolation test data is included in this report. The tests on 5-8-02 failed to meet the percolation test requirements. On 6-21-02 the shallow test hole passed the percolation test by meeting the minimum rate of 1" per hour. All the tests were conducted by a representative of Earnest F. Smith &Associates, Mr. Walt Curtis. Mr. Curtis is a Licensed Civil Engineer in the State of California. CONCLUSIONS The percolation test results indicate the soil tested on Parcels 1 & 3 are not conducive to a percolation rate that is in compliance with the existing EHD requirement for residential development using a standard system. Parcel 2 tests do permit a standard system to be installed. The size of the parcels present ample space for a leach field that is engineered for the type of soil conditions existing at the site on Parcel I & 3. On Parcel 2 there must be some selection on the area chosen for the leach field. The vernal pools must be avoided. The highest ground on Parcel 2 was selected for the test location. This may be some distance from the residence and may not be acceptable to the owner. By selection near the residence equal soil conditions could probably be found.