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WALLACE - KUHL Err ASSOCIATES,INC. <br /> SUBSURFACE SOILS EVALUATION <br /> U.S. SPRINT <br /> 6855 W. Eight Mile Road <br /> Stockton, California <br /> WKA No. 1004.41 <br /> INTRODUCTION <br /> Purpose and Scope <br /> We have completed a subsurface soils evaluation at the subject property located at 6855 W. <br /> Eight Mile Road. The purpose of our investigation was to evaluate the soils in the area of the <br /> previously existing 8000-gallon underground diesel tank and product line for potential petroleum <br /> '$. hydrocarbon contamination. <br /> The scope of our work included the drilling and sampling of soil borings B1 and B2 at the <br /> location of the former underground tank. Two additional shallow soil borings (B3 and B4) were <br /> placed along the former product line location. Boring locations are shown on Plate 1. <br /> A soil sample was obtained at the base of each boring using a modified California sampler <br /> containing two-inch diameter brass tubes cleaned with trisodium phosphate. A ground water <br /> sample was retrieved from boring B1 with a disposable plastic bailer. Soil samples were sealed <br /> with aluminum caps and wrapped with tape. All samples were preserved on ice and submitted <br /> under chain-of-custody to a certified analytical laboratory for analysis of total petroleum <br /> ' hydrocarbons (TPH) and benzene, toluene, xylene and ethyl benzene (BTX&E). Following <br /> sampling, all borings were backfilled with a four-sack cement grout. All on-site field work was <br /> performed under the supervision of Kasey Foley of the San Joaquin County Public Health <br /> ' Services - Environmental Health Division (PHS-EHD). <br /> Site Description and Histor <br /> The subject property is northwest of Stockton, California, in a rural area composed primarily of <br /> t ' land used for agricultural purposes. The northern portion of the property is bounded by a river <br /> levee. A relay station for the U.S. Sprint Corporation is currently present on the site. The station <br /> rests on an elevated building pad approximately ten feet above surrounding grades. The <br /> elevated pad was constructed in 1984 with imported fill material. An underground diesel tank <br /> was installed on the site as a fuel source for the station's emergency generator (see Plate 1). <br /> r <br /> 3050 INDUSTRIAL BOULEVARD PO BOX 1 137 WEST SACRAMENTO, CA 95691 (916)372-1434 • FAX(916)372-2565 <br />