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(2) The explorhtefy boring may be of any diameter capable <br /> of allowing 'the detection of first water_ <br /> (3) The explo ator boring shall be drilled to first <br /> perennial grgun water or to a minimum depth of 100 <br /> feet for ernatives 2, 3, and 6 or to a minimum depth <br /> of 30 feet or Alternative 4. <br /> (4) If ground 4 ter i encountered and ground water <br /> monitoring Ynwith <br /> t of the monitoring alternative, the <br /> boring shalonverted to a ground water monitoring <br /> well concis the provisions of this section and <br /> Section 2 7 of�this article. <br /> (5) If ground w%r-er is countered but monitoring is not <br /> required orth exploratory boring does not <br /> encounter gn water, it shall be sealed in <br /> 'Ir► ���Clijt;��+�'a e+t �;,t;� ,� F +Cj ;r ��; ;;. accordance w the provisions of Subsections 2648(q) <br /> and (s) of is article. <br /> (q) All borings that are not used for ground water or <br /> vadose zone monitoirng shall be sealed from the ground <br /> surface to the bottom of the boring with bentonite <br /> grout. <br /> (r) All borihq that are converted to vadose zone <br /> monitorin cells In which the monitored interval is <br /> shallower/than the total depth of the boring shall have <br /> the portton '`Qf the boring which is below the monitored <br /> interv4 3eal6d with bentonite grout. <br /> (s) All slurry-type grouts used to abandon a boring or for <br /> well seals shall be emplaced by the tremie method. <br /> (t) All borings shall be described in detail using the <br /> Unified Soil Classification System and shall be logged <br /> by a professional geologist, civil engineer, or <br /> engineering geologist who is registered or certified by <br /> •+ '�:,�'� H �qp-{ut= ;`r:1:; Y�i is yid)- '- r. the State of California and who is experienced in the <br /> use of the Unified Soil Classification System. A <br /> technician trained and experienced in the use of the <br /> Unified Soil Classification System who is working under <br /> the direct supervision of one of the aforementioned <br /> Professionals shall be deemed qualified to log borings <br /> provided the aforementioned professional reviews the <br /> logs and assumes responsibility for the accuracy and <br /> completeness of the logs. <br /> / {u) ) All wet zones above the free water zone shall be noted <br /> 4.27 <br />