Laserfiche WebLink
Eckert Cold Storage Company <br /> 7S7 Moffat Boulevard January 3, 2000 <br /> • Manteca, California Page: 8 <br /> moist quartz sands with little fines are present. A layer of silty clay is found between 16-21'. <br /> The soil unit from 21-30' consists of dense, wet, silty sands. Wet, loose, running, quartz sand <br /> is present from approximately 31-56.5' in depth. Appendix C contains information regarding <br /> ' soil types encountered during the drilling process. The lithology of the site is illustrated in the <br /> cross-sections contained in Figures 5, 6, and 7 of this report. <br /> ' 6.0 Hydrology <br /> California and Federal Governments have mandated that virtually all groundwater is <br /> beneficial for current or future use, unless it can be demonstrated that no beneficial use is <br /> known. <br /> This "aquifer" is considered to be of beneficial use and as a result, must be protected from <br /> contamination. Those identified uses include agricultural and industrial, as well as <br /> potential use for animal or human consumption. <br /> ' Groundwater was encountered at approximately 23' below ground level (b.g.l). Based of <br /> previous groundwater measurements collected during quarterly monitoring events, the <br /> typical groundwater gradient and direction at this site is approximately 0.002 ft/ft to the <br /> lieNorthwest. <br /> ' 7.0 Conclusions <br /> Based on the data developed during this scope of work the following conclusions have <br /> been made: <br /> ' • Soil contamination in the form of MTBE is not present, at or above the reporting <br /> limits, in any soil sample collected from the subject site during this phase of work. <br /> This fact further supports WHF's opinion that the source of MTBE contamination in <br /> ' the groundwater is from an off-site location. <br /> • Trace amounts of soil contamination was found in the soil samples collected from B-1, <br /> ' B4, and MW-8. This soil contamination is most likely the result of the migration of <br /> the dissolved water borne contamination. <br /> ' . The vertical definition of the soil contamination at B-3, the former tank location, <br /> remains undefined. Soil sample analysis indicated that petroleum hydrocarbon <br /> contamination extends to at least 55' below grade level (b.g.l.). The lateral definition <br /> ' of the soil contamination plume is defined and is illustrated in Figure 8. <br /> 1 <br />