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San Joaquin County Public Health Services <br /> .August 16, 1991 ;I <br /> Page Three <br /> stockpiled—on—sit_e�o:visqueen. The material [will be covered with visqueen <br /> pending soil sample results:Disposal methods will be discussed upon receipt <br /> and evaluation of soil sample results. 4 <br /> h <br /> Upon completion of excavation and soil sampling, the excavated area will I( <br /> need to be back—filled immediately so as to avoid possible cave in and damage <br /> to the adjacent structure. <br /> The excavated area will be lined with visqueenijprior to back—fill with clean <br /> compac a e imported ' g.u.een_w_i11.._s_e_rye=two purp� s."1)— <br /> To separate clean back—fill material from previously contaminated soils, <br /> and 2) To demarcate the extent of the excavation should further excavation <br /> need to be undertaken. <br /> In addition to the material to be excavated, bher±exexas�s�o�+�sa-te,two=soa.,l� <br /> sjtockp_ilesafrom=the-=or_i-gi-nal=tank—•exxcavat on (figure 2). In order to <br /> ascertain the best way in which to deal with this material, analytic sampling <br /> will be required. Both pile 1 and 2 shall be sampled at approximately 1 ' <br /> under the surface of the stack in a location decided by a PHS/EHD inspector. <br /> ea <br /> oth of the samples should be analyzed for (TPHdJ, (TPHg), and (BTEX). Bothamples will collected in a brass tube, the ends covered with aluminum foil <br /> nd sealed with plastic caps. Each sample will be placed on blue ice and <br /> ransported under chain of custody to a state certified analytical laboratory <br /> by a lab employee. <br /> If these samples indicate non—detectable levelslof (TPHg), (TPHd), and (BTEX) E <br /> we would request permission to utilize these materials as back—fill. <br /> CONCLUSION: Taking all factors into consideration, the work—scope described <br /> in this plan may be sufficient to close j this site without further h <br />� investigation. <br /> I look forward to your comments and approval . ' If you have any questions, <br /> please feel free to contact me at 2 90943=O11'Ta <br /> Sincerely, k <br /> i <br /> KOLAS-BOK i.D_E.S <br /> NB/jb <br /> � r <br /> 1, <br /> II <br /> '' a <br />