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January 7,2003 <br /> Job Number:LG02-026 <br /> Page 7 <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In conclusion, a satisfactory percolation rate was achieved on the parcel adjacent to the existing <br /> filter bed septic system. No ground water was encountered in the borings. The depth to ground <br /> water was found to be greater than 45 feet in a boring excavated by Neil O. Anderson & <br /> Associates, Inc. during a geotechnical investigation in May 2002 of the property. The DBCP and <br /> nitrate water quality tests do not exceed the maximum contaminate level for those chemicals. <br /> Based on the results of this study, the soils and the existing filter bed septic system appear to be <br /> satisfactory for the proposed development. As mentioned previously, the existing filter bed <br /> disposal area and the proposed increased use level appear to be satisfactorily matched . This <br /> observation is based on typical assumptions and methods used in the industry and in San Joaquin <br /> County. The calculation has also shown that there is no additional disposal capacity available in <br /> the design. There appears to be ample tank capacity available. <br /> Since the filter bed system is over 10 years old and the available disposal capacity within the <br /> existing filter bed to be utilized by the new use, our office recommends the entire septic system <br /> be inspected by a quailed septic system service company. Any needed servicing of the septic <br /> system should be performed. Regular septic system maintenance consisting of tank cleaning and <br /> inspections can increase the life of the system. We recommend a filter bed repair area be <br /> identified and set aside if one has not been made already. Should the system experience reduced <br /> performance or failures, the expansion area could be utilized for repair if necessary. <br /> 7.0 LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development,the use of the subject property, and the site conditions as they existed at <br /> the time we excavated our test hole and performed the percolation test. It was assumed that the <br /> test hole and percolation test results are representative of the subsurface conditions in the general <br /> area. <br /> pE RSO <br /> f h <br /> Z w <br /> O � <br /> <,t S G C♦ <br /> r <br />