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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C I A T E S <br /> INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> (POST TENSION DESIGN <br /> July 6,2005 n V� L� V D <br /> NOA Project Number: E05007B <br /> Transmitted by First-Class Mail and Fax: (209) 464-0138 JUL - 7 2005 <br /> ENVIRONMENT HEALTH <br /> Mr. David Van Dyne,R.E.H.S.,Land Use Program PERMIT/SERVICES <br /> San Joaquin County,Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> RE: Addendum tq Soil Suitability S <br /> 30220 South Highway 33,Tracy,California <br /> Land Use Application #PA-05-232 <br /> Report Dated March 28, 2005 <br /> Dear Mr.Van Dyne: <br /> Per your request,we have prepared this addendum to the above-referenced Soil Suitability Study. <br /> This addendum was prepared to respond to the comments in the"Requirements Checklist <br /> Comments" dated June 17,2005. <br /> 3.1-3.3:According to a conversation with Mr. Wheelock, the property owners' son-in-law (personal <br /> communication,June 22, 2005), the residence, shop and septic system date back to the 1970s. He <br /> also noted that the shop is used for private purposes as a workshop/storage;no plumbing or septic <br /> system is associated with the shop. <br /> 3.6: From the permits for the vicinity septic system repair that were found on file EHD,it seems <br /> that the septic systems in that area usually do not need repairs. The soils of the area appear to be <br /> able to accommodate a standard septic system. <br /> 4.2: The results of the water sample cannot give definitive information as to existing ground water <br /> �lA{� nitrate or DBCP contamination or any other contaminant on the site. Well construction, seals, age <br /> and depth of the well screens may play significant part in assessing the levels of Nitrate and DBCP <br /> ��. in various aquifers. Without knowing specific details regarding well construction and condition,it <br /> would be difficult to accurately comment of the condition of the aquifer. Essentially,the water <br /> sample concentration approximately indicates the contaminant concentration level of the aquifer <br /> from which the well is drawing. It is Neil O.Anderson and Associate's opinion that,in general,near <br /> surface aquifers are more likely to have elevated concentrations of Nitrate and DBCP than the <br /> deeper aquifers. However, the contaminant concentration of one aquifer cannot give any indication <br /> ��y P 'as to the concentrations of any other aquifer regardless of proximity. <br /> LODI ■ SACRAMENTO ■ MODESTO ■ RENO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 0 209.369.4228 fax 0 www.noanderson.com <br />