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Rzj <br />Working To Restore Nature <br />estimate of the volume of contaminants remaining in soil beneath the site. Using this highly <br />conservative approach, RESNA estimated volumes of 3.0 gallons and 0.0019 gallons of diesel <br />and benzene, respectively, remain in soil beneath the existing structure The organic rich, fine <br />grained soils at the site are highly adsorptive of petroleum hydrocarbons Based upon the <br />discussions presented herein, RESNA does not recommend further soil investigation. <br />Laboratory analyses of water samples collected from site monitoring wells have not exhibited <br />detectable levels of petroleum constituents since the initial sampling in March 1991 (0.6 ppb <br />xylenes in MW2) This would suggest groundwater underlying the site is not significantly <br />impacted Excavation sampling results indicated that localized groundwater contamination <br />existed immediately after the excavation where the groundwater came in contact with <br />remaining impacted soils. However, the relatively low effective porosity (high specific <br />retention) of the silt and clay soils impedes movement of dissolved hydrocarbons No further <br />action is recommended <br />If you have any questions or require additional information, please call John Lane of RESNA <br />at (209) 838-3507 <br />Respectfully, <br />RESNA Industries, Inc. <br />in P. Lane <br />Project Manager <br />A_,, )J, -7V�A- <br />Gregory P. Stahl <br />CA Registered Geologist No 5023 <br />Attachments <br />pc Zona Corrigan <br />Lee Helms <br />1500541RAD2-994 DOC 6 <br />0 <br />�y1 <br />GR -E/ GOR1Y P. <br />ST AP i.—f <br />ep` <br />6 RO• �4. <br />