Laserfiche WebLink
- 1 111NICI-HiRNIR <br /> Mr. Charles Leubner <br /> ,." 26 March 1991 <br /> i Page 2 <br /> REMOVAL OF UNDERGROUND TANKS <br /> >I The 500-gallon diesel tank (Tank No. 4), the 500-gallon solvent tank (Tank No. 5), and the <br /> 1,000-gallon waste oil tank (Tank No. 8) were removed on 14 January 1991. After the tanks <br /> were inerted with dry ice they were removed from the excavations with the backhoe and <br /> placed on a flatbed truck and inspected for holes. No holes were evident in any of the <br /> tanks. The tanks and associated piping were transported by Erickson, Inc. to their facility <br /> =� in Richmond, California. On 15 January the tank excavations were backfilled with the soil <br /> excavated during tank removal. <br /> EXCAVATION SAMPLING <br /> = Letitia Resch of the San Joaquin County Public Health Services, Environmental Health <br /> Division, was on site during the collection of the soil samples submitted for analyses. The <br /> samples were collected on 14 and 15 January 1991. <br /> One soil sample was collected from beneath each of the 500-gallon tanks, the diesel tank <br /> -_ (Tank No. 4) and the solvent tank (Tank No. 5). Each of these samples was collected at a <br /> depth of approximately one foot into the native soils beneath the level of the bottom of <br /> the tank. One sample was also collected from beneath the piping associated with the diesel <br /> and solvent tanks. This sample was collected in stained native soil at a depth of <br /> approximately one foot below the former piping location. <br /> { Two samples, plus duplicates, were collected for analyses from the 1,000-gallon waste ail <br /> tank (Tank No. 8) excavation. These samples were collected from each end of the <br /> excavation, at a depth of approximately two feet into the native soil beneath the former <br /> location of the tank bottom. Duplicate samples were collected from the waste oil tank s <br /> _{ (Tank No. 8) location to ensure that a sufficient volume of soil material was sent to the <br /> laboratory to conduct the full set of analyses that were required at this location. <br /> Four samples were also collected along the length of the remote fill lines of the 10,000- <br /> gallon diesel tanks. These samples were collected from native soils at approximately 20- <br /> foot intervals along the length of the piping, at a depth of one to two feet below the <br /> former location of the remote fill lines. <br /> - i <br /> 4 <br /> .-1 <br /> i <br /> LABORATORY ANALYSIS <br /> The analytical program for the soil samples consisted of the following analyses, as specified <br /> by Letitia Resch of the San Joaquin County Public Health Services, Environmental Health <br /> t.'sr Division included: <br /> -I Y <br />