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1a. f�lerzver �_shibitina tI,Q hi�ah�,t 131,sitive rexponsas from <br /> r?a+r.r� �iv4t-fu �i 0AMP)6.: lntorval will tae prl?zerved, <br /> .1ahoIvcl and ch Ain-r_ P-CUStaldy hi.10d-do I i Yered to the <br /> swlected laboratory far analysis of Total Petrc.leum <br /> Hydrocarbons (TPH) , Aromatic Vc-:.atile organics <br /> (STEX), Ethylene Dibromide (EDB) and Total Lead. <br /> 14. The borings will be converted into 4" monitor wells with <br /> casing. <br /> The ground water monitor wells will be constructed with 4- <br /> inch polyvinyl chl-_ride (P4C) through the hollow-stem auger (see <br /> PROTOCOL FOR GROUND WATER MONITORING WELLS, Table 2 and Figure 7). <br /> Samples obtained from the borings/monitor wells we be preserved, <br /> r labeled and chain-cif-custody hand-delivered to McLaren <br /> Laboratories of Rancho Cordova ( a State Certified Lab ) for the <br /> fallowing analysis: <br /> - ._ SSOIL WATER <br /> y <br /> EPAE-Xtaction method 3550 <br /> l EPA 8015 (TPH) EPA 8015 (TAH) <br /> EPA 8020 (PTEX) EPA 602 (LTEX) <br /> EPA 601 (EDB) <br /> EPA 7420 (total lead) EPA 7420 (fetal lead) <br /> �i <br /> Samples from each boring will be collected for the above <br /> mentioned laboratory analysis based upon the following criteria: <br /> highest concentration of contamination, base of baring, <br /> t immediately above water and water, and <br /> i , probable contamination <br /> levels below action levels. A hand-held Phuto:L nixing Detector <br /> (PID) will be used to field screen each sleeved soil sample <br /> obtained from the borings. The PIA will be calibrated with a 50 ' <br /> parts per million gasoline vapor standard. The PID will also be <br /> used to screen air quality near and around the baring that is <br /> being drilled to insure that the proper safety prar_itices are <br /> being observed. <br /> Should you have any questions concerning this site please call <br /> (916) 662-4541. <br /> Sincerely yours, <br /> George L. Converse <br /> Western Geo -Engineers <br /> i <br /> Project Geolc.gist <br /> cc. .john Margowski, Regal-A Wickland Oil Company <br /> Diane Hinson, San Joaquin County Health <br /> Page 3 <br />