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2 <br />Waste Manifest Number 89804342. The rinse water and residual material from the <br />10,000-gallon wastewater tank was transported by Kern Vacuum Service to Refineries <br />Service under Uniform Hazardous Waste Manifest Number 89804377. A copy of the <br />manifests signed by the transporter are included in Appendix B. <br />After triple rinsing, the underground storage tanks were inerted by packing with dry-ice. <br />Both oxygen content and lower explosive limits were monitored in the tanks by Mr. Ron <br />Hiltscher from the City of Stockton Fire Department. When the tanks were properly inerte-d, <br />Mr. Hiltscher confirmed the LEL and oxygen levels and allowed the tank removal activities to <br />proceed. The underground storage tanks were then removed from the ground. The 26,000- <br />gallon and 2,000-gallon tanks were transported to the Learner Company of Stockton for <br />destruction. The 10,000-gallon tank was transported to LMC Metals of Stockton for <br />destruction. A copy of the San Joaquin County Underground Tank Disposition Tracking <br />Record signed by the disposal facility is included in Appendix B. <br />Removal of the underground storage tanks was observed by Mr. Charles Hunt from <br />San Joaquin County Public Health Services. Upon removal from the excavation, the <br />underground storage tanks were cleaned of adhering soil and inspected for evidence of leaks. <br />No holes or patches of thick rust were observed on the tanks. Visible staining was present in <br />the soil beneath the 26,000-gallon diesel tank and the 10,000-gallon wastewater tank, and <br />petroleum odors were detected during removal of the tanks. Soil samples were collected for <br />chemical analysis following removal of the underground storage tanks. <br />The wastewater line from the fueling platform to the 10,000-gallon wastewater tank was <br />integrity tested on November 21, 1990 by Crisp Tank Testing of Stockton. The line initially <br />passed the integrity test at 2 psi pressure, but failed the integrity test at the required 5 psi <br />pressure. A copy of the test report is included in Appendix C. The soil beneath the line will <br />be sampled and tested for total extractable petroleum hydrocarbons every 20 feet as required <br />by San Joaquin County. Removal of the line is dependant on the results of the soil samples <br />and final placement of the proposed clarifier system. <br />3.0 SOIL SAMPLING <br />1. Soil sampling from beneath the former underground storage tanks was observed by <br />Mr. Charles Hunt of San Joaquin County. The location of the soil samples are shown in <br />ENVIRONMENTAL SOLUTIONS