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;t p E ft s NEIL.O.•ANDERSON& ASSOCIATES, INC: GEOTECHNICAL•ENVIRONMENTAL•GROUNDWATER•INSPECTIONS•TESTING-LABORATORY SERVICES CORPORATE OFFICE SACRAMENTO OFFICE Z su 22 Houston Law 4221 Northgate Boulevard,Suite6 C MCO (530)991-004 Lodi,California 95240 Sacrwnmto,California 95834 C,% STOCKTON (2D9)472-1D91 (209)367-3701 (916)929-9267 S S O G RANCHO CORDOVA (916)631-4455 FAX:(209)333-8303 FAX:(916)929-9269 August 21,2001 ; Jab No.LG00-339 16 . Mr. George Rose Western Asset Recovery. 900 Post Road Oakdale, CA 95361. ' Re_ Addendum, Soil Suitability/Nitrate Loading Study 12897 South Cometa Road,Oakdale California 11A 01 04 Dear Mr.Rose, .. � Per your request,we have completed our evaluation of eleven(11)new proposed residential parcels located northwest of the intersection of Cometa and Edwards Roads in Valley Home,California. This work was performed as a new addendum to a Soil'Suitability/Nitrate Loading Study dated October 12,2000. Two . . (2)addendum letters dated November 27,2000 and dated April 12,2001 in addition to this letter,supplement the original report. General Eleven (11) new .proposed residential parcels, whose size ranges from 2.10 to 2.47 acres, are planned to be included as part of the residential development. The location of the eleven(11)parcels are shown on Plate no. 1. We understand from San Joaquin County Public Health.Services, Environmental Health Division (SIC PHS-EHD)' that additional percolation tests and an addendum letter to the Soil Suitability/Nitrate Loading Study dated October 12,2000 would be required for the project.- Our roject:Our scope of work included conducting eight (8) new percolation tests, one on each of eight (8) parcels which have not received a test. Three(3) of the eleven(11)parcels are in areas which have been evaluated by a percolation test performed.by our office during the fust phase of percolation testing last year. In addition,an.addendum letter describing the results of the testing and our recommendations was prepared. . Test.Borings On August 8, 10,and 16,2001,eight(8)percolation test borings were drilled on eight parcels(Plate 1).Generally,the eight(8)borings composed of similar materials which consisted of a mix of medium sand within a matrix of silt or clay. Below clayey surface soils, sandy silt was the predominate soil type.A thin clean sandy`stratum was normally encountered between the depths of 7-feetto 21-feet. This sandy zone was selected for the percolation test. The soils encountered during the drilling.of the eight(8)percolation test holes were similar of the,soil conditions encountered at other locations of the site.