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tEnvironmental <br /> Mr Harlin Knoll Resources <br /> 27 April 1998 Management <br />' Page 6 <br /> • <br /> detections At both sites, the highest detections are associated with the <br />' wells located in the immediate vicinity of the former tanks TPH and <br /> BTEX detections decrease dramatically in nearby wells, indicating that <br /> the extent of affected ground water is limited The consistency with <br />' historical results indicates that the plumes do not appear to be migrating <br /> Historical trend analysis indicates that TPH and BTEX concentrations <br />' have decreased significantly over time The introduction of 4RC appears <br /> to have enhanced the level of microbial activity at each site, as evidenced <br /> by the dramatic increase in heterotrophic plate count results <br />' Please feel free to contact me at (925) 946-0455 if you have any comments <br /> or questions <br />' RSD GE <br /> Sincerely, 5� A QUazui�l p <br /> + mak, >\\• 4iy�'ct' <br /> No 6024 <br /> Jill A Quillin, R G <br /> Project Manager 9 OF <br />' CJH/laq/2996 00 <br /> enclosures <br />' cc Mr James Adams, Catellus Development Corp <br /> Ms Elizabeth Thayer, CVRWQCB <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> • <br />