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s <br /> GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AN D ASSOCIATES <br /> INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> MID ((( (l DESIGN <br /> August 16, 2004 ) <br /> NOA Project Number: LE03-120 AUG 1 8 2004 <br /> Transmitted by First-Class Mail and Fax: (209) 464-0138, 5 pages ENVIRONMENT HEALTH <br /> Mr. Raymond Borges, R.D.I„ R.E.H.S. PERMIT/SERVICES <br /> San Joaquin County, Environmental Health Department(EHD) <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: Addendum to Soil Suitability/Nitrate Loading Study <br /> 16910 South North Ripon Road, Ripon, California <br /> LA-01-102 <br /> Dear Mr. Borges, <br /> Per your request, our office has prepared this addendum to the above-referenced Soil <br /> Suitability/Nitrate Loading Study as outlined in your letter dated August 12, 2004. Sections <br /> listed refer to the Requirements Checklist in your letter: <br /> 1.2: Mr. Mike Huggins, Supervising Environmental Health Specialist of the EHD, has indicated <br /> to our office, in a letter approximately two years ago, that Second Dwelling Units (SDU) are <br /> required to be included in the nitrate loading calculation. He said the SDU is no larger then <br /> 1,500 square feet and contains up to two bedrooms. I have reviewed Chapter 9-830 of the SJC <br /> Development Title and do not see any mention of two bedrooms. I believe it was his intent to <br /> view them as being two bedrooms for the purpose of the nitrate loading study. It is my opinion <br /> that this is a reasonable assumption. <br /> 2.3: It is our understanding that vineyards were removed to make way for new development. <br /> Cherries and walnuts had existed on the property at the time of the report. <br /> 3.1, 3.3, & 3.6: Based on my experience and conversations with EHD staff, shallow ground <br /> water in the Ripon area typically contains elevated levels of nitrate. This is a fairly common <br /> occurrence where shallow ground water depths coexist with permeable surface soils and human <br /> development. These sandy unconfined sandy aquifers, located in the Manteca, Ripon, and the <br /> Lathrop area, are sensitive to nitrate impacts from dairies, agriculture, and septic systems. Based <br /> on examination of well logs, the sandy unconfined aquifer zones near the site terminate below 20 <br /> to 50 feet in depth and probably become semi to fully confined aquifers with enough depth. This <br /> is due to the presence of low permeable clay layers which also restrict the downward percolation <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 IN 209.367.3701 0 209.369.4228 fax ■www.noanderson.com <br />