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v <br /> 0 <br /> to the nor"least During: the:period. <br /> rof ;October 1987 to May Xggg <br /> .the-depth to;;groundi+rater'°'was;'approxf mately,. 44 tea-� Tli�;,gradient' <br /> dixetfon varied',':- from' . about. N �.-30° E to <br /> groviidwater gra3iezit' directions during .the, ;19,9.D/91..:,pariod .:were . <br /> measured to be:` to, thea southeast It _ should be ,noted that. the <br /> gradient 'to the southeast is_ approximately :;3 foot Z,000 :feet <br /> while the'` ones to "the nort. east';are 7" and 8 feetJ�l040 feet <br /> iri3icatin' ` the <br /> g Pradominate gradient `is. to the northeast <br /> No contamination at or above cleanup level of benzene has <br /> been detected except on the one occasion in Monitor Well 11 on <br /> March 30, 1990, when it was measured at 1.O ug/l. <br /> CONCLUSION <br /> Contamination relating to the removal of these three tanks <br /> appears to have been remediated and the site should be considered <br /> as rr-mediated. <br /> RECOMMENDATION <br /> Continue to monitor through June 1991. If all wells are <br /> free of contamination at that time then the well should be <br /> destroyed and monitoring cease. <br /> i Enclosures: Plate 1: Vicinity Map <br /> i Plate 2: Site Plan <br /> Table 1: Groundwater Analysis <br /> Table 2: Groundwater Elevation Data <br /> Attachments: Groundwater Analysis: .' <br /> S <br /> cc: Teichert <br /> Regional Water Quality Board J. <br /> ''9{ <br /> Fid Fg <br /> � No. 14600, v <br /> Era.7.3t• ; <br /> 1 3 r �:! <br />