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Roberts Oil Company May 23, 1988 Project No. 1628G Page 5 1.) The apparent ground -water flow direction appears to have changed direction from southeasterly (Kleinfelder, 1987), to southwesterly (Exceltech data) over a one year period. The change in flow direction could be due to local ground -water pumping influence. A well location survey should be performed to determine the existence of ground -water wells within a one- quarter mile radius of the site. This information can be obtained by contacting local and state agencies. 2.) The field analytical data indicate that well MW -1 has a history of free- floating product. Well MW -4 analytical results indicate that TEH as diesel is present in the ground -water west of the above -ground tank farm in relatively low concentrations. No detectable concentrations of TVH as gasoline or BTX were present in wells MW -2, MW -3, or MW -4. 3.) Three additional monitoring wells should be installed and sampled for the purpose of defining the vertical and horizontal extent of contamination on site. One well would be located southeast of the transfer block to monitor ground water in a former downgradient direction (Figure 3). Another monitoring well would be located near the southwest corner of the property in the current downgradient direction. This well is needed to ascertain the extent of TEH contamination downgradient of well MW -4. The third monitoring well would be located upgradient and north of the transfer block. 4.) Copies of this report should be forwarded to the San Joaquin Local Health District (SJLHD) and the California Regional Water Quality Control Board (RWQCB), Central Valley Region in a timely manner.