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r <br /> WALLACE • KUHL&ASSOCIATES,INC. <br /> GEOTECHNICAL ENGINEERING ENGINEERING GEOLOGY <br /> ENVIRONMENTAL CONSULTING CONSTRUCTION TESTING <br /> January 29, 1991 <br /> Post Tank <br /> Attention: Jeff Post <br /> P.O. Box 657 <br /> West Sacramento, California 95691 JAji 3 �951 <br /> I Cl ti'`�'dI�GP•1Ncirli' <br /> f'cRI%4!rISE12VlC 5 LTH <br /> E SOILS SAMPLING AND TESTING <br /> SWIFT TRANSPORTATION <br /> 781 SWM Ngy_ ✓-e y <br /> Stockton, California <br /> WKA No. 1004.37 <br /> I <br /> c <br /> Introduction <br /> We have completed the observation, sampling and laboratory testing of soils exposed during the <br /> removal of two underground fuel tanks from the subject property. One 10,000-gallon diesel tank <br />�I <br /> and one 7,500-gallon diesel tank were removed from the property on January 14, 1991. <br /> The scope of our work included sampling and laboratory testing of soils obtained from beneath <br /> each end of the diesel fuel tanks and at every 20 Iineal feet along product line as recommended <br /> in the Sampling Protocol for Routine Tank Removals presented in the Tri-Regional Guidelines of <br /> i <br /> the California Regional Water Quality Control Board (CRWQCB). <br /> Soil samples were obtained by driving clean, two-inch diameter brass tubes into soil taken from the <br /> sample locations with a backhoe bucket; sample locations and depths are shown on Plate 1. The <br /> sample tubes were sealed with aluminum foil, plastic caps, and tape to reduce volatile hydrocarbon <br /> loss. Samples were preserved on ice and submitted to a certified analytical Iaboratory for analysis <br /> of total petroleum hydrocarbons (TPH), and benzene, toluene,xylene and ethyl benzene (BTX&E). <br /> Samples taken from beneath the 7,500-gallon diesel tank also were analyzed for TPH as gasoline, <br /> WET lead, and ethylene dibromide (EDB), as directed by Letitia Resch of the San Joaquin County <br />` Public Health Services, Environmental Health Division. Samples were handled and transported in <br /> I. accordance with current state and county guidelines. <br /> t <br /> 3050 INDUSTRIAL BOULEVARD PO BOX 1137 • WEST SACRAMENTO,CA 95691 (916)372-1434 . FAX(916)372-2565 <br />