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NEIL-0: AN 'RSON'&�ASSOCIATES,INC. _ *- , .,� VERs y GEOTECHNICAL•ENVIRONMENTAL•GROUNDWATER-+INSPECTIONS TESTING•LABORATORY SERVICES 4 a CORPORATE OFFICE SACRAMENTO OFFICE AU 22 Houston Lanc 4229 Northgate Boulevard,Suite 3 r CMCO (530)891-6304, Lodi,California 95240 Sacramento,California 95834 gsSpG�P STOCKTON (209)'472-]091' (209)367-3701 .(916)929-9267 RANCHO CO66VA (916)63 1-"55 FAx:.(209)333-9303 FAX:(9 16)929"9269 April 12,2001 } Job No:LG00=339 Mr.George Rose Westen Asset Recovery 900 Post Road ' Oakdale,CA 95361 C? Re: Addendum, Soil'Suitability/Nitrate Loading Study 12897 South Cometa Road, Oakdale California LA-01.04 Dear Mr.Rose,.. Per your request, we have completed our evaluation of new.proposed residential parcels located northwest of the intersection.of Cometa and Edwards Roads in Valley;HoLne, California. We understand that you propose to create six(6)new parcels involving some property previously evaluated by our office. .This work was performed-as anew.addendum to a,Soil Suitability'/Nitrate Loading Study dated October 12;. 2000 and report addendum letter dated November 27,2000. . General A letter from Mr. Rodney Estrada dated February 24, 2001, describes the.San, Joaquin County . . Environmental Health:Division's requirements for the lot line adjustments. Requirement A essentially requires additional percolation testing and an addendum letter'to the soil suitability study/nitrate loading study" .As a clarification,'Mr.Estrada was asked if it was necessary to conduct a new percolation test on a new proposed lot.if a percolation test had been performed there during a previous phase of testing. Mr. Estrada said that percolation testing should be performed on all the.lots. He said if testing has previously occurred within an area bounded by-the new lot'line, further testing was not required" He said that the locations of all the old lots,the new lots,the location of old percolation tests,and new percolation tests should be clearly marked on a map Essentially,each lot requires a percolation test with the exception of new Parcel 5 as described in Requirement A'. The soil'suitability study/nitratc loading -study was_conducted at the site to determine whether the proposed parcels are suitable for the use with a septic system and to estimate the potential impact-of leaching nitrogen to ground water. The study was performed according to the requirements of,Section 9-1105.2(d) of the San Joaquin.County Development. The conclusion of the investigation found that a lot size of 2.0 acres-or above would not cause nitrate buildupabove the maximum drinking water standard established by the Environmental Protection Agency. Each lot size of 2.0 acres and greater was found to be suitable for.use with a residential septic systema Test Borings _ On April 4;2001,one test hole and percolation test was set on new Parcel 1,new Parcel 2,and new Parcel 3 (Plate 1). Since new.Parcel'4 and new Parcel 6 have proposed lot line adjustments.whichenclose an area previously evaluated by soil boring and pereolation'test,these areas did not require further testing. ; New Parcel 5.is not a buildable lot and will not require a soil!boring,or percolation testing as previously discussed: