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© ° a <br /> Q <br /> depth to groundwater was approximately 100 feet. According to <br /> the map of "Lines of Equal Depth to Water in Wells" published <br /> fall of 1989 by the San Joaquin County Flood Control and Water <br /> Conservation District, the depth to groundwater at this <br /> location is between 90 and 100 feet. <br /> A water sample was obtained from the well at 4 : 10 pm on <br /> August 23 , 1990. The sample was submitted to the laboratory <br /> and tested for the presence of EDB (ethelylene dibromide) and <br /> DBCP (dibromochloropropane) which are soil fumigants used in <br /> cherry and cashew vineyards. A copy of the test results is <br /> contained in the Appendix. The results indicate that both <br /> substances tested for were above the MCL (maximum <br /> concentration limit) allowed by law. <br /> VI. SOIL PROFILE AND PERCOLATION TESTS <br /> A test pit was excavated to a depth of 10 feet adjacent <br /> to the existing leach line to determine the soil profile. The <br /> test pit was excavated with a Cat 416 backhoe equipped with a <br /> 24 inch bucket. Visual classification of each soil stratum <br /> encountered was made in the field by a civil engineer at the <br /> time the test pit was excavated. A description of each soil <br /> encountered is contained in the Appendix as Log of Test Pit. <br /> The surface soil consisted of a brown silty sand that <br /> changed to a slightly silty sand with increased depth. The <br /> surface soil was underlaid by a stratum of brown well graded <br /> sand which in turn was underlaid with a stratum of slightly <br /> cemented brown silty sand. There was a slight amount of <br /> perched water encountered on top of the cemented stratum at a <br /> depth of 8 feet. <br /> A percolation test was performed adjacent to the existing <br /> leach line. An 8 inch diameter test hole was excavated to a <br /> depth of 42 inches. The test hole was filled with water 24 <br /> hours prior to running the test. The test data obtained is <br /> enclosed in the Appendix. The results of the test indicate <br /> that the soil had a percolation rate of 14 minutes per inch. <br /> For approximate location of both the test pit and <br /> percolation test please see the Tentative Parcel Map in the <br /> Appendix. <br /> VII. CONCLUSION <br /> Based on the results of the percolation test, the soil <br /> profile, and the past performance of the existing septic <br /> system it is our opinion that the subject property is well <br /> suited for the continued use of the present septic system. <br /> Although the depth of the dry well is known, according to <br /> 3 <br />