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1 a �-�`t ?';h 't ;� �- L� a.^•'-?.� '`� � i�!'.'�3 � ;.� '�:•h��'•- �.5�y-4;ns.,. d" aF L "rT�.'�`._1' '"i.,f'�,^ <br /> �r <y la -r. k ,s2:..r. .�•�vi.f ��v r: �. f;rc. ,'?`.;`c. c.-t"-. .,�}� `ytr 3. _ t S f t.., ,y;..' 1' ,�,�n L•'" ,�+^� "� �k! <br /> � y-. '' Y'�i.v'a a, .�*:�;*�f i"4; ^-.x �"e c`', ;� � •��M t� �a z t �,w <br /> � <br /> Vii. sl`d`�R�r �'.,� �; w� h�`^ _�L,•.;;. -* o- -"�- .r�{...a, "F v �; I�'_ � .��7R wr'�. a �� q � i"4'. F. <br /> for chemical analyses. <br /> S041 sa7,pies were also sub: -tted to <br /> !:Olson Laboratories, Stockt .:1 for Crain size analyses . <br /> q _ 1 . 2 mase lI <br /> During Phase ?I , nenitor well installation techniques were <br /> modified from those previously used. A 8-53 Auger rig was <br /> used to drill two 7-inch diameter boreholes, each cOnPleted <br /> through an approx:.mate depth of 55 feet. <br /> So: 1 samples were collected at 5 it intervals, beginning at 5 <br /> feet, using a hollow stem auger. Upon retrieval, soil samples <br /> a <br /> were described by an ;c field 5eoingist for lithclogy and <br /> color_ Prior to sasole submission for chemical and physical <br /> analyses, soil samples were screened with a photoicnization <br /> t ^ resence of volatile organic <br /> detector (PID) to determine the p <br /> !" compounds (VOCs) - Tye PID .;as calibrated as per nanufacture. s <br /> directions, but provided no evidence of strata Warranting <br /> additional laborat.ry analyses. Subsamnles -,ere therefore <br /> submitted for laboratory analyses only for those Collected 2." <br /> both 30 and 35 feet, based on recommendations of the ESS field <br /> t � geologist, general concordance with Anheuser-Husch ' s field <br /> aearesentative, and interpretation of County Health <br /> regnarements, soil samples were iced, and delivered to the <br /> laboratory Within 24 hours of sample collection . <br /> 1,7 <br /> E:ach borehole Was completed as a 2-inch diameter ground water _ <br /> monitor well, as shown previously in Figure 4--2 , and described <br /> in Table 4-1 . Uiecisio:js to screen discrete i.ntexvaIs -were <br /> based primarily C01!nty Health' s requirement to screen <br /> >.M approximately 20 f(,et )f the upper `.urated zone and provide <br /> some additional screening to account for possible groundwater <br /> fluct%:ation5 . Unlike daring Phase I , PID readings were all <br /> close to ambient levels, and provic'sd little input in the <br /> decision making pracess. <br /> •9-6 <br /> ELM& ,��r <br />