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Eckert Cold Storage Company ' 757 Moffat Blvd, Manteca, California October 13, 1999 Quarterly Groundwater Sampling Report;September, 1999 Page: 3 1991 in California, three years after the removal of the UST's on-site (Appendix D). A ' conversation with a representative from Chevron indicated that MTBE was not present in their motor fuels until 1992. California EPA was also contacted in order to determine the year in which MTBE was first distributed in gasoline in California. This inquiry indicated ' that the first appearance of motor fuels containing MTBE in California was in 1991. Therefore, MTBE was never present in the motor fuel stored on-site. ' Given the evidence presented above it is apparent that the MTBE contamination is from an off-site source. WFIF does not believe that Eckert Cold Storage Company is responsible for any MTBE on-site given the previously stated evidence summarized below: 1 • MTBE was not found in the soil columns during the construction of MW-5, MW-6, and MW-7. • MTBE was not found in the groundwater for the first three sampling events ' after the requirement to analyze groundwater for MTBE. During the November 5, 1997 sampling event, MTBE contamination was present for the first time and has been increasing in concentrations ever since, except for a ' • minimal decrease in concentrations this quarter. • MTBE was not distributed in gasoline in California until 1991, three years after the removal of all UST's on the subject property. There are several potential sources up-gradient (southeast) of the subject site that may be contributing to the problem. One possible source of concern is the petroleum pipeline located along the Union Pacific Railroad parallel to Moffat Boulevard. This pipeline is owned and operated by Kender Morgan Energy Partners. Kender Morgan Energy Partners was contacted and informed WBF that the pipeline is used to pump gasoline and tdiesel fuel. It is WHF's opinion that the nearby sites should be investigated to determine the source, or sources, of the MTBE release. 1 The next phase of work at this site will be to explore and attempt to define the lateral and vertical extent of soil contamination. This will be accomplished by completing four (4) ' shallow soil borings to a depth of forty feet (40') and one deep boring to a depth of approximately sixty feet (60') to confirm the presence or absence of petroleum hydrocarbons in the unauthorized release area. 1