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Associates of Sacramento; California; and Aegis Environmental, Inc. (Aegis), of Roseville, <br /> California. Site details may be found in a Quarterly Groundwater Monitoring Report, dated <br /> April 18, 1991, submitted to Moore Petroleum by Aegis. <br /> On May'5, 1995, a soil vapor extraction system consisting of an R.S.I. SAVE.-system was <br /> installed at the subject site. The vapor extraction.system was installed per San Joaquin Valley.' <br /> Unified Air Pollution Control District (SJVUAPCD) Permit conditions. The vapor extraction <br /> system consists of an.internal combustion engine with catalytic converters mounted on the. <br /> exhaust. The system was configured such that soil vapors could be-extracted from either vapor <br /> well VEW-land/or monitoring well MW-1. The system was started on May 5,-1995, and <br /> operated through October 4, 1995, at which time it was temporarily removed from site. On <br /> November 27, 1995, the system'was returned to the subject site and restarted. <br /> An air sparge system was i nstalled.for use in conjunction with the vapor extraction system. The <br /> air sparge system'consisted of a one horse power electric motor which powers a 10-cubic feet per <br /> minute(CFM):oil-less compressor. The compressor injected air through an air sparge point <br /> located midway between VEW-1 and MW-1. The air sparge system was started on May 31; <br /> 1995 and operated intermittently through August 30,.1995,'at which time.its operation began to <br /> coincide with the operation of the R.S.I: system. <br /> On April 29,'.1997, Apex received permission from the.County}to shut down the air sparge and <br /> vapor extraction system due to low influent soil vapor concentrations to the vapor extraction <br /> E` system. As of April 29, 1997,the remediation system has extracted a total of 1,730 pounds of <br />'4 total petroleum hydrocarbons (TPH), as gasoline, and 19,9 pounds of benzene. F <br /> Apex submitted-a Over Excavation & Groundwater Removal Workplan dated September,10; <br /> 1997, proposing over.excavation, de-watering and sampling of the bulk loading rack and tank <br /> basins during the nine UST removals. <br /> Apex'supervised the removal of two 350 gallon USTs,'T-8 and T-9 (kerosene and cleaning <br /> solvent, respectively) on August 17, 1998 and,September 8, 1998, respectively. Also, seven <br /> 10,000 gallon USTs were removed on September 8, 1998. Results of the UST removal'were - <br /> documented by Apex in the report titled Tank Closure Results and.Recommendations.Report <br /> dated December 23, 1998. - ; <br /> Following the removal of T-9, soil was over excavated and an exploratory trench was dug. -Apex <br /> - collected two soil samples and one groundwater.sample from the over excavation and t <br /> exploratory trench. One soil sample was collected from beneath T-8. After the'removal of the <br /> seven 10,000 gallon.USTs, Apex.collected four soil'samples and one groundwater sample. Apek <br /> E then collected six additional soil samples and two additional water samples from beneath the <br /> tank basin. Nine soil samples were submitted for analysis from the area beneath the former bulk <br /> loading rack: The results of all soil and water sampling were documented in the report Tank <br /> Closure Resultsand Recommendations Report dated December 23,.1998. <br /> 4 1• <br /> ' x <br />