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.10 -"A-A'a If.� <br /> _RRM <br />'°' a ��� `,�•' �xm.+,�� �".w �,�7 �, `^++� '{P' s.•jC-�''qi��, r��tr-•.°'���rw^�Y�'+"':��''.,,�` '� a" - �q7n <br /> ;� .�.^ „� _�, ..fie�";a'E+ .y,,��a- �d'^r--� .gyt ' ✓?»,e;:�e:. ""�A,- ^�s� e�r�e�.n���"�.t�,4=',> � ?.�sc$� �'y' <br /> '`-� � rt 1 •„r � ,� ”"s '� � T� +�l' t F�'�',:,' .',,���� ",m �+' '-�?;,, 3=,� i.�'f' �,. ����, F ZY:' �.�`,Y�•• ?':,y. .. i+... ��"•� Ny <br /> es�P <br /> Monitorin Well Installation Procedures <br /> The monitoring well consists of 2-inch diameter Schedule 40 PVC casing set in an 8-inch diameter <br /> boring. The boring was billed under the direction of an engineer or geologist from our firm. <br /> A detailed boring log was kept at all times noting: 1) material types encountered with depth <br /> (Unified Soils Classification System),and 2) moisture conditions. The boring was drilled using <br /> - a Mobile B-57 drill rig equipped with 8-inch diameter continuous flight hollow stem augers. The <br /> monitoring wells consist of a bottom plug followed by 30 feet of Schedule 40 PVC screen with <br /> factory machined horizontal slots (0.020-inches),then blank casing to the surface. Each section <br /> of casing is joined together using factory-made threaded connections, thereby eliminating the <br /> necessity for any glues or solvents. The well packing material consists of pre-washed No. 2112 <br /> sand and extends a minimum of 2 feet above the slotted casing. Bentonite chips were used to <br /> seal the well casing a minimum of 2 feet above the packing material. A neat cement slurry or <br /> sand cement slurry was used to backfill the remainder of the boring. A locking cap was set on <br /> top of the well head which is set approximately 0.5 feet below grade. A flush mounted water <br /> tight box was used to protect the well head. A well log for each monitoring well was submitted <br /> on the appropriate form to the California Department -)f Water Resources. Soil cuttings <br /> generated by the drilling operations were stored in 55 gallon drums at the project site. Water <br /> produced during well development and sampling operations was stored in 55 gallon drums at the <br /> site. <br /> Ground-W.tier 5ampline_hfethods <br /> A ground-water sample was collected from each monitoring well. Prior to sampling the well, <br /> approximately five well volumes were removed in order to bring fresh formation water into the <br /> well. The ground-water sample was collected using a pre-cleaned teflon bailer. The teflon bailer <br /> was cleaned in a trisodium phosphate (TSP) solution, r-.Jsed with clean water, rinsed with <br /> methanol, and fit ally rinsed with deionized water and allowed to air dry. The ground-water <br /> sample was placed in the appropriate glass containers with tellon-lined lids. Each sample was <br /> labelled and immediately placed in an ice chest and cooled to 4°C using blue ice. <br /> 1 <br />