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0� uahtyC% Q Control Inspi6EttionC.n C ' O MAIN OFFICE Q ❑1nS NORTH EMERALD,BLDG.O•MODESTO,CALIFORNIA 95351 •PHONE:(209)527-4940 BRANCHES STOCKTON(209)466-975 MERCED(209)7232425 July 14, 1999 QCI#: E-99-830 FOR: Mr. Randy Smith Lesovsky-Donaldson Architects 4 South Central Court Stockton, CA 95204 PROJECT: Proposed University Public Schools 10042 North Highway 99 Frontage Road Stockton (Morada), CA SUBJECT: Percolation Testing for Septic System Design INTRODUCTION Quality Control Inspection, Inc. has been retained by Mr. Randy Smith of Lesovsky-Donaldson Architects to conduct percolation testing at the above-referenced project. The proposed school building consists of a former strip center that is called the Morada Center. It is our understanding the school will occupy the entire building. Mr. Chance Wong of Wong Engineers, Inc. is the Civil Engineer for the project. The purpose of this investigation was to 1.) examine the underlying soil structure, 2.) conduct percolation testing and 3.) provide an interpretation of the data obtained. As requested by the San Joaquin Environmental Health Department, information on the reliability of existing septic systems at this location was also evaluated. SUBSURFACE SOIL STRUCTURE Our subsurface soil investigation began with the preparation of the percolation test borings. A Mobile Drill B-53 Drill rig was used to bore two shallow test holes of 42 inches in depth and two deep borings of 25 feet. As denoted on the attached site plan, one shallow and one deep boring was drilled in the area of the primary drainfield (denoted as "East Shallow/Deep") and a shallow and deep boring was drilled in the 100% replacement area(denoted as "West Shallow/Deep"). The deep borings were not extended past 25 feet since the County ordinances specify seepage pit depth to be a maximum of 25 feet. Sampling was accomplished with a split spoon sampler, with 18 inch samples retrieved from every five feet in depth. The attached log of borings illustrate the subsurface soil structure. 1 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 Ouality Control Inspection,Inc.