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Additional groundwater remediation is necessary at the site to remove <br /> hydrocarbon mass from beneath the site <br /> • Groundwater remediation is necessary at the site to prevent <br /> contaminated groundwater from migrating off-site to the north a n d <br /> west The current groundwater remediation system should be modified <br /> to capture the contamination west of RW-1 <br /> • Remediation of deeper water-bearing zones on-site is not necessary at <br /> this time <br /> I <br /> Remediation north of the site will be needed for both the shallow <br /> water-bearing zone, as well as deeper zones identified in ASE's report <br /> dated March 21, 2001 However, additional assessment is needed in <br /> this location before remediation can be proposed ASE recommends <br /> performing additional assessment activities at this location including <br /> performing a review of historical photographs, aerial photographs, file <br /> reviews and performing an electromagnetic survey at the site in a n <br /> attempt to identify a potential well or other potential conduit for the <br /> downward migration of contamination <br /> 4 . 0 REMEDIAL OPTIONS <br /> The following lists typical remediation options for soil and groundwater <br /> remediation from petroleum-hydrocarbons currently in use in northern <br /> California <br /> 4A Sol] Overe cavation <br /> This remedial option involves the excavation of contaminated soil a n d <br /> either treating the soil on-site or transporting the soil to an off-site <br /> treatment or disposal facility On-site soil treatment is usually by aeration <br /> or bioremediation Advantages of this method is that it is the fastest a n d <br /> most effective method in treating contaminated soil, and removes <br /> contaminated soil which could act as a source for groundwater <br /> contamination The disadvantages of this method are that (a) it would <br /> require the closure of the on-site business for an extended period of time, <br /> (b) it may require the removal of soil surrounding the UST and fuel <br /> dispensing system (possibly endangering the integrity of these systems), <br /> (c) it may cause significant nuisance odors, and possibly unhealthy <br /> . hydrocarbon concentrations in the air in the site vicinity, (d) it does n o t <br /> Frank's One Stop Remedial Action Plan — August 2001 <br /> -13- <br />