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21300 MANN ROAD Project No.2019-00095 Pa g e 18 <br /> term. It is our professional opinion that mitigation measures are not warranted at this time. <br /> However, it should be noted that mitigation measures may be recommended and required <br /> at a later date based on changes in nitrate in the groundwater, and long-term monitoring <br /> results for the region. <br /> 7.0 EXISTING AND PROPOSED SEPTIC TANK USAGE <br /> 7.1 Existing On-Site Septic Tank Usage,Permits and Repair History <br /> There are three septic permits available for review related to the Site. Permit No. 6765, issued in <br /> 1955 is for the installation of a concrete septic tank and disposal field for one 4-bedroom residence; <br /> Permit No. 19634, issued in 1965 is for one new septic tank and disposal field for one 2-bedroom <br /> residential trailer; and Permit No. 68-757 for a new septic tank and disposal field to replace a <br /> dysfunctional system for a 2-bedroom residence. <br /> The permits are available for review in Appendix B. <br /> There are two septic systems associated with non-permitted structures that are to be demolished; <br /> reportedly, there will be no septic systems remaining on site prior to the installation of the newly <br /> proposed residence and associated septic system. <br /> 7.2 Expected Maximum Septic Tank Usage for Site <br /> Expected maximum septic tank usage for the Site is to accommodate a proposed three-bedroom, <br /> two-bath,single-family residence. <br /> 7.3 General Area Septic Tank Usage,Permit,and Repair History <br /> In an attempt to determine the septic system density for the vicinity of the site,our office reviewed a <br /> recent aerial photograph available from GoogleEarthTM. We counted the clusters within <br /> approximately one square mile of the site,with the assumption each building cluster has one septic <br /> system. Using this method, we determined there are approximately 140 septic systems per square <br /> mile in the immediate vicinity of the site.This is a low amount of septic systems,with the majority of <br /> these systems located on large tracts of agricultural land. <br /> The EHD septic permit files were obtained from the San Joaquin Environmental Health Department <br /> (EHD) Online EHD Program Records6 in an effort to obtain copies of permits for any septic tanks <br /> located within the general area of the subject property. <br /> Copies of the septic search permits for surrounding parcels have been included in Appendix C of this <br /> report.The records are summarized in the following table: <br /> 6 https://lfweb.sjgov.org/WebLink/Browse.aspx?dbid=18cr=1 accessed September 9, 2019 <br /> Petralogix Engineering,Inc. <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)-400-5729 4P <br /> www.petraloglx.com <br />