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�L O. A&._MSON & AS CIATES, INC. 1'�� GEOTECHNICAL•ENVIRONMENTAL•GROUNDWATER•INSPECTIONS•TESTING•LABORATORY SERVICES",n CORPORATE OFFICE SACRAMENTO OFFICE 22 Houston Lane 4221 Northgate Boulevard,Suite6 CHICO (530)691-5304 Lodi,California 95240 Sacramento;Califonua 95834 s$O STOCKTON"(209)472-1()91 (209)367-3701 (916)929 9267 - - RANCH 0 CORDOVA (916)631-4455 FAX:(209)333-8303 FAX:(916)929-9269 December 19, 2001. Job No.LG00-339 Mr. George Rose Western Asset Recovery 900 Post Road 'Oakdale, CA 95361 Re: Addendum; Soil Suitability/Nitrate Loading %1A JA 7 2002 Cometa and Edwards Road,.Oakdale California - ENVfRO 22 23,24 25 26 27,and 28 p IRM r HE/j[rf ' LA-0.1-73,Parcels 21, " MS—O1-33,Parcels 1,2, 3,-and Remainder RVI�FS Dear Mr. Rose, Per your request,we have completed our evaluation of twelve(12)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. Four(4)previous addendum letters dated November 27,2000,April 12,1200 1.,August 21,2001,and November 27,2001 were prepared, . to supplement the original report or respond to qestions from San Joaquin County Public Health Services, Environmental Health Division .(SJC PHS-EHD). This is the fifth addendum letter for the project. General We were asked by George-Rose to complete percolation tests and prepare an addendum letter for. the original Soil Suitability/NitrateLoading Study for submittal to SJC PHS-EHD. This involved conducting twenty-four(24)percolation tests,a shallow and deep percolation test on each of the twelve(12)new parcels. A conversation with Ms.Lisa Medona„R.E.H.S.with SJC PHS-EHD,indicated that a report amendmentwill be required for project approval: She also indicated that this phase of the project involves a lot line adjustment number LA-01-73 and minor subdivision number MS-01-33. The lot line adjustment(LA-0l-73) `) includes Parcels 21, 22, 23,24,25, 26, 2.7,and 28. The minor subdivision MS-01-33) i cudes Parcels 1; 2,3,and the remainder parcel. The twelve(12) .new proposed residential parcels range-n from'2.10 to 10.78 acres. Please see attached maps for parcel location and percolation tests location. Test Borings On November. 15, 17 and December 4,200 1,the percolation test borings were"drilled. One shallow and one deep percolation test hole was drilled on each parcel:Generally, the soils were fairly"consistent throughout the site. "A"brown sandy silt or brown sandy clay was encountered in the shallow depths up to about 2.5-feet deep. Typically located below the surface soil is a brown silty fine to.medium sand. Within. _ the brown silty fine.to medium sand is often a fairly clean fine to medium sand whose thickness is between about 3-feet to 7-feet. Occasionally clayey soils were encountered. The percolation tests were set adjacent to 4 permeable soil layer. The depth to the first permeable soil layer is presented in Table 1.