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i <br /> (2) an unidentified source to the west of the property, and (3) a <br /> possible additional source to the north and/or northwest <br /> 3 Based upon the results of the work covered in this report, <br /> the placement of additional monitoring wells on the property, as <br /> originally programmed, does not appear justified. Additional <br /> work, if required by your agency, should be directed at deter- <br /> mining the location(s) of possible offsite sources . The work <br /> dust completed shows that the entire area is degraded, and that <br /> our clients property does not appear to be the cause of most of <br /> the contamination encountered. <br /> RECOMMENDATIONS : <br /> 1 . Placement of additional monitoring wells at this location <br /> should be deferred until ALL possible offsite sources of <br /> contamination have been identified. The cost of placing and <br /> monitoring additional wells at this time will not aid in the <br /> definition of the extensive groundwater plume (s) which are known <br /> to exist in this area If your staff believes that additional <br /> monitoring points are essential to definition of this problem, we <br /> would like some imput on where they should be placed. We do not <br /> have the extensive data base that is available to your office, <br /> and are reluctant to commit our client to additional expenditures <br /> without more information. <br /> 2 . Further investigative work should be conducted to the west of <br /> the property in an attempt to determine the source or sources of <br /> suspected leaking' UST' s . This function is not the responsibility <br /> of our client, since there is no evidence to show that a gasoline <br /> UST is present on the property. <br /> 3 . Quarterly monitoring of the existing wells should continue <br /> for at least two more sampling periods By that time, there <br /> should be sufficient data available to assist in determining <br /> the next phase f the project <br /> Wm J. Hun 'r & Associates D GEOIp <br /> cc ; E izai� th Thayer <br /> W W/Miles <br /> YVILUA4h 1 HUNTER <br /> R. autze +ili? <br /> Linda Turkatte, San Joaquin Co. EHD <br /> Carrie Fisher, Independent Trucking NU 860 <br /> Larry Bradfish sT9�OFCPUF� <br /> 6 <br />