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M <br /> INTRODUCTION <br /> Regal 604 was operated as a gasoline service station by Wickland <br /> Oil Company. On September 26, 1989, five underground storage <br /> tanks were removed by Town & Country Construction Company. The <br /> excavated soil was field screened during the excavating process <br /> using a Photoionizing Detector calibrated with a 25 ppm gasoline <br /> vapor standard (HNu PID) . ~ Based upon the field screening the x <br /> excavated soil was stockpiled into piles. Soil Pile (SP-1 ) , <br /> highest PID response, SP-2, moderate PID response, SP-3, low PID <br /> response and SP-4, low to no PID response. The piles were then <br /> covered and later sampled. <br /> Upon obtaining the initial chemical results of the sixteen samples <br /> obtained from approximately 400 cubic yards of excavated soil, <br /> (noted as SP-1 ) , high gasoline range total petroleum hydrocarbons <br /> (TPH-G) were noted. The TPH-G ranged from 550 ppm in sample SPI-N <br /> to 6000 ppm in sample SP1-A with a mean of 2922 ppm. <br /> The relatively high concentrations in the SP-1 excavated soil pile <br /> along with the high benzene levels in the soil sample taken below <br /> tank 3 raised concern in the San Joaquin County Health Dept. The <br /> need to classify the excavated soil as to a hazardous or <br /> nonhazardous material arose. <br /> LOCATION <br /> The site is known as Regal Station 604 and is located at 1448 N. <br /> E1 Dorado and Harding Way in Stockton, California. This site is <br /> in San Joaquin County and lies in projected section 2 ; T1N; R6E; <br /> MDB&M at approximately 14 feet above mean sea level . In this area <br /> ground water can be located between 35' to 55' feet below the <br /> surface, dependent upon the time of the year. Exploratory borings <br /> performed on December 1 , 1989, encountered ground water between <br /> 47' and 481 below the surface. <br /> CLASSIFICATION AS TO HAZARDOUS OR NONHAZARDOUS MATERIAL <br /> PROCEDURES <br /> As outlined in the State of California, California Code of <br /> Regulations, Title 22 . Social Security, Division 4 . Environmental <br /> Health: Article 2, Scope and Procedures , section 66300. <br /> (Applicability) , section 66305. (Classification of a Waste as <br /> Hazardous or Nonhazardous) , and section 66310 . (Variances . ) <br /> Article 9, Hazardous Wastes and Hazardous Materials, section <br /> 66680: numbers 101-Benzene, 320-Ethylbenzene, 355-Gasoline, 738- <br /> is Toluene, and 776-Xylenes need to be tested for ignitable and all <br /> 2 <br />