Laserfiche WebLink
SSS/NLS 30652 E. Edwards Ave <br /> Page 2 <br /> (4). Page 9. Paragraph 1. <br /> States, "The nitrate balance method assumes 100% mixing with deep percolation rain water <br /> over long periods of time beneath acreage of the subject parcel". This statement is <br /> contradicted on page 12,paragraph 3: "The clay layers will probably inhibit the downward <br /> percolation of the treated septic effluent and rainfall. There is a difference between the <br /> Manteca conditions (clean sand and shallow ground water) and the project site location <br /> (heterogeneous sand/clay layers with fairly deep groundwater). When both are taken into <br /> account,the rainfall data from CIMS Station#70 Manteca, CA of 6.79 inches may not be <br /> indicative of the project site location, and could be reasonably inferred to be less. <br /> (5). Mass Balance Analysis <br /> The results of the Mass Balance Analysis noted on pages 10 & 1 I determine that the <br /> minimum area of parcel required for a three (3) and four(4)bedroom residence is .75 to 1.0 i <br /> acres. This acreage would produce nitrate concentration at the Maximum Contaminant <br /> Level (MCL) for drinking water of 10 mg/1-N. Environmental Health Division would not <br /> support development of parcels having on-site septic systems and domestic water wells with <br /> less than the two (2) acre minimum required by the San Joaquin County Development Title, <br /> Section 9-300.1.(a). j <br /> -i <br /> (6). The field log for parcel#14 was not included in the report. <br /> If you have any questions, please contact Rodney Estrada, Senior R.E.H.S. of my staff at (209) <br /> 468-0331. <br /> Karen Furst,M.D., M.P.H. <br /> Health Officer <br /> j <br /> Mike Huggins, Supervising R.E.H.S., R.D.I. <br /> Environmental Health Division <br /> I <br /> MH:re <br /> i <br /> cc: George Rose <br />