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a <br /> WALLACE • KUHL <br /> Ia A550CIATES INC <br /> REPORT OF FINDINGS <br /> ' 1444 MARIPOSA ROAD <br /> LC Stockton, California <br /> WKA No 2307 02 <br /> JUN Q 4 1993 May 24, 1993 <br /> ' ENVIRONMENTAL HEALTH <br /> PERMIUSERVICS <br /> ' INTRODUCTION <br /> ' In accordance with our workplan of December 4, 1992, we have' completed <br /> exploratory soil borings at the U S Rental Facility Located at 1444 Mariposa <br /> Road 1n Stockton (Plate 1) The purpose of our work was to evaluate the <br /> ' J extent of subsurface petroleum hydrocarbon contamination beneath four former <br /> underground storage tanks and associated piping removed from the site July <br /> 21, 1992 by Semco The scope of our work included the drilling and <br /> t � - <br /> sampling of four exploratory soil borings in the vicinity of the former tanks, <br /> and preparation of this report <br /> a <br /> V t <br /> , SITE HISTORY ' <br /> Geotechnicat Engineering <br /> i <br /> Engineering Geatng., On October 29 and November 2, 1992 our firm observed the excavation of <br /> ' h Envtronmentll Consulting <br /> approximately 1500 cubic yards of soil from the vicinity of the former <br /> underground storage tanks Ten soil samples were obtained from the sidewalls <br /> F Remediation Services and bottom of the excavation Laboratory test results for the sldewall <br /> ' Conatrucuon Inspect.on samples, obtained from a depth of approximately 22 feet, revealed non- <br /> detectable concentrations of Total Petroleum Hydrocarbons (TPH) as gasoline, <br /> ' Materials Testing diesel, and motor oil and non-detectable concentrations of Benzene, Toluene, <br /> Ethylbenzene, and Total Xylenes (BTEX) Results for the bottom samples, <br /> 1; obtained from depths of 27 to 30 feet, revealed TPH as gasoline <br /> ' 30501ndnstriat Blvd concentrations ranging from non-detectable to 25,000 mg/kg Based on these <br /> results, the excavation was deepened to approximately 36 feet below grade on <br /> f West Sacramento I <br /> € <br /> CA 956 1 November 9, 1992 At 36 feet below grade, petroleum hydrocarbon odors <br /> were still noticeable in the soils, so an exploratory trench was dug in the <br /> Fax 916 372 2565 <br /> � 416 3721434 <br /> RecycW paper <br />