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Rot e u(I ontrol nspection Inc. g ,.+ MAIN OFFICE 0 1295 NORTH EMERALD,BLDG.0•MODESTO,CALIFORNIA 95351 •PHONE:(209)527.4940 BRANCHES STOCKTON(209)466-8378 MERCED(209)723-2425 QCI#: G-92-754A April 10, 1992 FOR: Western Empire Management Corporation 11 South San Joaquin Street, Suite 400 Stockton, CA 95202 PROJECT: Roman Catholic Diocese of Stockton 275 East Eight Mile Road San Joaquin County, CA SUBJECT: Percolation Testing On April 3 , 1992 representatives of Quality Control Inspection, Inc. prepared two percolation test borings using a truck mounted B40H Mobile Drill Rig at locations selected by our field personnel . The test locations can be found on the attached Testing Report and are approximately 400 feet to the south of the proposed Bear Creek Community Church, on the "remainder" property. The testing was conducted in accordance with the Environmental Health Department' s percolation test procedures. The percolation test holes were drilled using an eight-inch O.D. solid stem auger to depths of approximately five feet for the shallow test boring and nine feet for the deep test boring. Test hole sidewalls were scarified and sleeved with four-inch O.D. perforated pipe to prevent cave-ins and insure test hole integrity. Gravel was added to the hole bottom and placed in the annular space between the perforated pipe and the bore hole. The test borings were pre-saturated 24 hrs before percolation testing, which commenced on April 6, 1992 . Please find attached the "Field Percolation Testing Report" that includes test boring locations, percolation rates and recommended sewage disposal areas. As the test results indicate, the deep test boring, as tested, is conducive to percolation of sewage effluent. Since the shallow test hole had a very slow rate of percolation, any septic system installed in the area of the percolation test borings would have to be constructed with seepage pits. Respectfully submitted, Ir CON OL INSPECTION, INC. y, P.E. Our reports and letters are submitted as the confidential property of our clients for their exclusive use.Any publication or reproduction of statements,conclusions or extracts from or regarding our reports or letters is reserved,contingent upon the written authorization of Quality Control Inspection,Inc.