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2 <br /> JR Page 6 <br /> Consulting, Inc. April 6, 2009 <br /> Environmental- Engineering- Geology Project Number 2009007 <br /> Discussion of On-Site Septic Tank Repair History <br /> No septic repair permits were found for the site during file review at the EHD on March <br /> 20, 2009. l <br /> Description Of Existing Septic Tank Usage In The Area <br /> In an attempt to determine the septic system density for the vicinity of the Site, our office <br /> reviewed a current aerial photograph of the subject property available from GoogleEARTHTM. <br /> The number of building clusters within one square mile of the Site was identified, and each <br /> building cluster is considered to have one septic system. Based on the review a minimum of 47 <br /> septic systems are located per square mile in the immediate vicinity of the Site. <br /> General Area Septic System Permit History <br /> The following septic system permits were identified during file review at the EHD on <br /> March 20, 2009. <br /> • 1965 - East of Mann Rd, north of Acampo, CA—two 80 foot leach lines. <br /> • 1973 —21288 Mann Rd, Acampo, CA—three 90 foot leach lines. s, <br /> • 1988 —21474 Mann Road, Acampo, CA—one 40 foot leach line with one 33 inch <br /> diameter 25 foot deep seepage pit. <br /> General Area Septic Tank Repair History <br /> The following septic system repair permits were identified during file review at the EHD <br /> on March 20,2009. <br /> • 1955 -Mann Rd,north of Acampo, CA—added two 40 foot leach lines. <br /> IR SQUARED CONSULTING,INC. ENVIRONMENTAL-ENGINEERING-GEOLOGY <br /> 6532 MCNEIL COURT,VALLEY SPRINGS,CA 95252 PHONE(209)772-3841 •FAX(209)740-4303 <br />