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INTRODUCTION <br /> HK2, Inc./S.EMCO was contracted by RMC Lonestar to remove one 7,000 gallon, single-walled <br /> steel, underground diesel storage tank (UST) from the RMC Lonestar facility at 30350 South <br /> Tracy Boulevard in Tracy, California. Figure 1 shows the site location. Figure 2 is a site plan. <br /> Regulatory permits are in Appendix A. <br /> FIELD ACTIVITIES <br /> On May 19, 1998, HK2 removed the soil surrounding the UST and stockpiled it onsite, <br /> disconnected product piping, pumped the residual fluid From the tank into 55-gallon drulris, rinsed <br /> the tank with a pressure washer, pumped the rinse water into 55-gallon drums, and directed <br /> Thompson Crane Service to remove the tank under the supervision of Mr. Steve Sasson of the <br /> San Joaquin County Environmental Health Division (SJCEHD). Clearwater Environmental <br /> Management pumped the fluid from the drums into a pump truck and transported the waste liquid <br /> (approximately 165 gallons) to the Alviso Independent Oil facility in Alviso, California. The tank <br /> was transported as scrap material to the Modesto Junk disposal facility in Modesto, California. A <br /> copy of the waste manifest and SJCEHD UST Tracking Record is in Appendix B. <br /> Mr. Sasson directed North State Environmental (NSE; state certified laboratory/consultant) to <br /> collect two soil samples beneath each end of the UST at approximately 15 and 17 feet below <br /> grade (fbg) and three discrete samples from the excavated soil stockpiled onsite. The location of <br /> the samples collected beneath the former UST is shown in Figure 2. The samples were labeled, <br /> placed in an iced cooler, and submitted under chain of custody to NSE. The samples were <br /> analyzed for total petroleum hydrocarbons as diesel (TPH-D, Modified EPA Method 8015) and <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX; EPA Method 8020). Appendix C <br /> contains a copy of the laboratory report and chain of custody record. <br /> The excavation was barricaded after the samples were collected. RMC Lonestar will backfill the <br /> excavation in accordance with the S.ICEHD Backfill Excavation Certificate. <br /> 98-0 111 UST Rpt ( HK2, Inc./SEMCO <br />