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I <br /> I <br /> Ms. Virginia Cahill -2- 12 July 1989 <br /> 4. Regarding monitoring well construction and s'�ampling: <br /> i <br /> a) methods should be used with produce, a continuous lithologic log. <br /> Samples at five foot intervals in thel+highly heterogeneous, alluvial <br /> environment at the site is likely not '!sufficient; <br /> b) brass tubes may be used for soil samplies but are not necessary for <br /> � gene:r_aJ--m .n_er=a man-aay__s_e—s4—ani <br /> C) four-inch wells allow the use of a submersible pump for effective <br /> purging and sampling; using a bladder 'Ipump as proposed negates this <br /> advantage and potentially lessens the isample quality. ' <br /> 5. Lastly, the work plan states that your firmlwill determine whether or not <br /> to release the work plan results. All results of the proposed <br /> investigation must be submitted to our office in a complete report. I <br /> Teichert may incorporate all of the above comments into their work plan and <br /> proceed with the investigation. Alternately, Teichert may prepare a revised <br /> . work plan for our review and approval before initiating work. <br /> If there are any questions regarding the above, 'please contact me at <br /> 916 361-5742. <br /> Gary A. Reents } <br /> Senior Engineer <br /> - <br /> GAR.e j <br /> p <br /> s <br /> cc: dames Elder, LBME Corporation, Sacramento <br /> Robert Hamel , Teichert Land Company, Sacramento } <br /> Diane Hinson, San Joaquin County Efiviionriten ai Heal tVi, Stockton t <br /> I t <br /> 1 <br /> a <br /> v <br /> i <br /> I <br />