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Ms. Virginia Cahill -2- 12 July 1989 <br /> 4. Regarding monitoring well construction and slampling: <br /> a) methods should be used with produce, al continuous lithologic log. <br /> Samples at .five foot intervals in the ''Ihighly heterogeneous alluvial <br /> environment at the site is likely ,not ,'sufficient; " <br /> b) brass tubes may be used for'soi l_ samples but are riot necessary for <br /> general mineral- analyses and i <br /> ' c) four-inch wells allow, the use of a submersible pump for effective <br /> purging and sampling; using a bladder ;pump as proposed negates this <br /> _ _,_��advantage and,,00tential ly.,lessens_the�sample qual i.ty. __. <br /> 5. Lastly, the work plan states that your firmwill determine whether or not <br /> to release the work plan results. All resuljts of the proposed <br /> investigation must be submitted to.our. offic;e in a complete report. <br /> Teichert may incorporate all of the above comments into their work plan and <br /> proceed with the investigation: Alternately, TjI�ichert may prepare a revised <br /> work plan for our review and approval before. in ;tiating work. <br /> J. <br /> If there are ,any questions regarding the above, please contact me at <br /> 916 361-5742. i. <br /> ' 4 <br /> Gary. A. Reents R' <br /> Senior Engineer <br /> ` GAR:ej <br /> cc: James Elder, LBME Corporation,` Sacramento 1 <br /> =Robert:._:N'ame1,!,7eichert-�L:dna) Cr_%mp.any;,--S.acrall0t_0: :: �..- <br /> LD-i�ne Hinson, San Joaquin County EnvironmenNI Health, Stockton <br /> i <br /> IC <br />