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CreologicalTecknicslnc • Page 3 <br /> Work Plan Addendum <br /> Project No. 507.2 <br /> May 16,2005 <br /> GTI response: As stated in our work plan GTI believes that there are data gaps pertaining to the <br /> presence or absence of n sand/silt units near well MW-9 used in the pilot test. GTI proposed <br /> additional borings to provide subsurface data in between the standard five foot sampling intervals <br /> utilized in MW-9 and of r boreholes at the site. Three points are necessary to define a plane or <br /> a three dimensional view of these thin lenses or layers. Therefore three borings are necessary to <br /> define planar lithologic units in the subsurface. The locations of the three proposed borings are <br /> based on proximity to well MW-9 and the location of the former UST where the contamination <br /> plume core is centered. <br /> Additional Comments: <br /> We believe the clay dominated nature of the soils at this site has been an asset in preventing off <br /> site migration of the cont uninant. But this same characteristic will pose a significant challenge <br /> in removing these contain Inants, no matter what method is used. Given these factors, we believe <br /> that the remedial method selected for this site should include a gradual approach instead of a <br /> forced approach (such a dual phase extraction). The gradual approach could use time to <br /> accomplish cost reductio i and allow nature and batch mode injection of oxidizing agents to <br /> degrade contaminants. <br /> If you have any questions please do not hesitate to call us at(209) 522-4119. <br /> Respectfully submitted, <br /> 0 <br /> Joseph D. to <br /> Geologist <br /> -4 , <br /> Raynold I. Kablanow II P i.D. <br /> California Professional G ologist #5234 <br /> Certified Hydrogeologist 442 <br /> cc: Mike Infurna- SJ PHS/EHD <br /> James L. Barton - RWQCB-CVR <br /> USTCFP <br />