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0. <br />� •a:� �� ,xa rr <br /> .gin r i°nx> F ..-s A '*i. }' -� F e IK rrs,"�-`•. ,� . i l'G <br /> 1 <br /> t-- j <br /> I <br /> i <br /> The site has been impacted by petroleum product lose, uhich has <br /> reached the underlying ground water. This conr.lusion is basest on <br /> the hydrocarbons concentrations detected in both soils and ground <br /> water beneath the site. The relatively high hydrocarbons <br /> concentrations detected in Well 5-2, located approximately 40 <br /> feet from the doungradiont site boundary, suggest that dissolved <br /> gasoline may have migrated off-site. However with only two site <br /> wells it is not currently possible to determine the local <br /> direction of ground-water movement or the extent of the dissolved <br /> gasoline plume beneath the site. <br /> Because the potential exists for the plume to spread off-site, a <br /> thorough survey of nearby wells should be conducted. This survey <br /> should focus on identifying all (documented and undocumented) <br /> well locations within one mile of the site, detailing well <br /> construction and determining well activity. Whtle It is known <br /> that municipal water is available in the area, it appears that <br /> E private wells are also used to supplement the supply (See <br /> Appendix C), Additional Information regarding wells in the area <br /> May be available from the California Department of Water <br /> Resources and the City of Lodi. <br /> ° Results of the detailed well inventory may indicate the need for <br /> additional observation wells between the site and any usable <br /> water supply wells. These wells would help to establish tht <br /> extent of migration of the plume. If ground-water resources are <br /> threatened, ground-water remediation may be warranted. <br /> ,l The Regional eater quality Control Board, Central Valley Region, <br /> a is concerned about dissolved hydrocarbon concentrations that <br /> exceed the state action levels. A brief discussion of state <br /> regulatory perspective is presented in Appendix 0. <br /> If you have any questions regarding the contents of this report, <br /> a please call. <br /> i Respectfully submitted, <br /> PAC F ENVIRONMENTAL GROLF, INC. <br /> Erin Garn r <br /> Project Geologist <br /> Susan W,illhite <br /> Project Manager <br /> - -- -- �, - - - - CEG-127? -- - ---- <br /> F <br /> Pan_ 5 - <br /> t.. <br />