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13 November 1997 <br /> AGE-NC Project No 95-0128 <br /> Page 5 of 5 <br /> upper 10 to 15 feet of impacted fine grained soil in the vadose zone can also be addressed by <br /> carefully screened extraction wells This would remediate an estimated two-thirds to three-quarters <br /> of hydrocarbon-impacted soil <br /> Physicochemical and biological conditions in the soil and ground water do not appear to be viable <br /> for natural attenuation of the hydrocarbons through biological activity <br /> Although the ground water elevation has fallen approximately 4 feet since the previous monitoring <br /> event, it cannot be assumed that this trend will continue, especially with the exceptionally wet years <br /> anticipated to be associated with the current strong El Nino condition known to be developing It <br /> cannot be ruled out that ground water will not rise to record highs if several exceptionally wet years <br /> are immediately before us <br /> AGE recommends that the WA be approved and implemented as an inters rn measure to reduce the <br /> impact of hydrocarbon-impacted soil on ground water and to control the migration of hydrocarbon- <br /> impacted ground water associated with this site After the present situation is stabilized, a new CAP <br /> should be prepared to address the current situation of high ground water elevation involving <br /> hydrocarbon-impacted soil and ground water, as opposed to the previous CAP that was designed for <br /> the former state with a Iower ground water elevation and what was essentially a soil-only case <br /> The opportunity to provide this service is greatly appreciated If you have any questions regarding <br /> this report, please contact our office at(209) 467-1006 <br /> Sincerely, <br /> Advanced GeoEnvironmental Inc. \S� jk D 0 <br /> CC <br /> !Uo 5837 <br /> William Little Nuel C Henderson, Jr CAI.�F <br /> Staff Geologist Senior Staff Geologist <br /> California Registered Geologist No 5837 <br /> cc Mr Arthur Wyatt <br /> Ms Elizabeth Thayer (CVRWQCB) <br /> Advanced GeoEnviionmental Inc. <br />