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L <br /> City o,f Stockton A68107.01B <br /> LJuly 1A 1997 Page 11 <br /> • TPH-D was detected at 72µg/L in a groundwater sample collected from beneath the <br /> former UST location. This concentration is below the odor and taste threshold of <br /> 100,ug/L recommended by the U.S. EPA; <br /> L • Based on the the fact that BTEX constituents were not detected in groundwater <br /> above the minimum contaminant level and TPH-D was detected at concentrations <br /> below the odor and taste threshold, further investigation and/or remedial action for <br /> Lgroundwater does not appear to be warranted at this time. <br /> L 8.0 <br /> L • Copies of this report should be forwarded to SJCPHS for review and comment. <br /> ! 9.0 LIMITATIONS <br /> L Finding and recommendations presented in this report are based on the assumption that <br /> subsurface conditions and chemical concentrations do not deviate from those disclosed in <br /> L., the field and laboratory testing. If variations from these findings are found, Twining should <br /> be notified so that supplemental conclusions and recommendations may be provided. <br /> LThe purpose of a geologic/hydrogeologic study is to reasonably characterize existing site <br /> conditions based on the geology/hydrogeology of the area. In performing such a study, it <br /> L is understood that a balance must be struck between a reasonable inquiry into the site <br /> conditions and an exhaustive analysis of each conceivable environmental characteristic. No <br /> investigation is thorough enough to describe all geologic/hydrogeologic conditions of interest <br /> Lat a given site. <br /> Environmental conditions may exist at the site that cannot be identified by visual <br /> Lobservation. Where subsurface work is performed, our professional opinions are based in <br /> part on interpretation of data from discrete sampling locations that may not represent actual <br /> conditions at unsampled locations. If conditions are not identified during the study, such <br /> La finding should not be construed as a guarantee of the absence of such conditions at the <br /> site,but rather as the result of the services performed within the scope, limitations, and cost <br /> of the work performed. <br /> L The work waserformed for the sole use of Twinin 's client an r <br /> p g d appropriate regulatory <br /> Lagencies. Any reliance on this report by a third party is at such party's sole risk. <br /> Twining's professional services were performed, findings obtained, and recommendations <br /> Lprepared in accordance with generally-accepted engineering principles and practices in San <br /> L <br />