SU0003906 SSNL - Laserfiche WebLink

Home Browse Search

V. GROUND WATER AND DEPTH TESTING According to the map of "Lines of Equal Depth of Water Wells" published Fall, 1999, by the San Joaquin County Flood Control and Water Conservation District, the depth to groundwater at this location is approximately 110 feet. The gradient of ground water in the project area slopes east to west according to the map of lines of equal elevation published in the spring of 1999 be San Joaquin County Flood Control and Water Conservation District. (See Appendix). Due to depth of ground water in this area there are no immediate concerns for groundwater contamination. Water samples were taken from the well shown on the tentative map and analyzed for nitrates and DBCP. Samples were taken by Mike Toy, of Dillon & Murphy, the same day the percolation tests were performed. The samples were taken using the criteria of Precision Enviro-Tech. The water samples were taken from the outlet port from the well using a clean catch method. The well is a Standard rotary well for irrigation use. See Permit No. 78-643 for a repair to irrigation well (See Appendix). The samples were transported via automobile to Precision Enviro-Tech and released to them (see chain of custody in Appendix). The nitrate were measured-at-4-5-mg/l. The DBCP was measured as non-detect. (See Appendix for results). VI. SOIL PROFILE AND PERCOLATION TESTS Three test holes were excavated to a depth of 3.5 feet in the area of potential home sites. One test hole was done in the best possible area due to row crops. The purpose of the test holes were to determine percolation rate in these areas. For approximate location of the test holes, see the Tentative Parcel Map in the Appendix. The holes were prepared in accordance with County Standard. The percolation holes were dug on July 23, 2004, at 7:30 a.m., and on July 26, 2004 — at 7:30 a.m. filled with water to 12 inches above the gravel in accordance with County Standards, -The..time after the 24-hour presoak period was 7:45 a.m. On July 26, 2004 the,percolation-test_was performed. Soils lithology in the general area of the test holes consisted of finrod clay loam. As shallow percolation tests proved adequate for conventional septic systems, no further soil exploration was necessary. A copy of the Soils Classification Map prepared by the U.S. Department of Ag Soil Conservation Service is included in the Appendix. Their map classified the soils as finrod clay/loam. Due to this classification, there should be no potential problems or special engineering required on future septic systems. 2