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, <br /> APPENDIX A <br /> Standard operating Procedures i <br /> i <br /> This appendix outlines the standard operating procedures <br /> performed by Twining associated with drilling and soil sampling. <br /> In addition, decontamination procedures, and sample handling and <br /> chain-of-custody procedures are presented. Finally, the analytical <br /> methods and quality assurance andlquality control procedures are <br /> summarized, , <br /> `( <br /> A-1 Drilling and Soil SamolinQ Procedures: Each soil, boring <br /> is dri,lled. using a Central Mine Equipment Company (CME) 75' truck <br /> mounted drill rig equipped with 6#5/8-inch outside diameter (ob) t <br /> continuous-flight hollow-stem augers. Soil samples are collected <br /> by driving a California split-barrel ring sampler,equipped with ! <br /> three 1. 5-inch OD by six-inch-longi brass sleeves. a minimum of 12 <br /> inches into the soil. The bottom `sleeve is retainedd for chemical <br /> analyses. once the soil sample is brought to the surface, the ends <br /> :of the brass sleeve retained for chemical analyses are wrapped with <br /> Aluminum foil or teflon' tape, and fitted with plastic caps-. Soil <br /> retained in the two uppermost brass sleeves is transferred into Wit. ' <br /> plastic bag and field tested E'for organic vapors using <br /> a ; <br /> photoi.vnization detector (PID) . The soil within the plastic bag is: <br /> agitated prior to testing to enhance petroleum hydrocarbon <br /> volatilization. <br /> All soil borings are drilled under the direction of Twinings <br /> project geologist. Subsequent tofeld vapor testing, each soil <br /> sample is examined for geological characteristics,. Data ccrllect+�d f <br /> from this physical inspection are used to prepare continuous logs ` <br /> of borings. Y <br /> sails are Classified in the Iield according to the Unified <br /> Soil Classification System (USCS) The USCS classifies soil types <br /> based on consistency, moisture, plasticity, grain size, and ether <br /> distinguishing' :features. <br /> 80il cuttings. gerr .rated from. the drilling operations are <br /> transferred into 55�gall..on steel barrels. Each barrel is -labeled <br /> as to its contents The barrels are sttackpiled on-site at a <br /> location inaccessible to the public. The disposal/treattent .of j <br />{ this material is the: responsibility, of the c3 gent: The appropriate <br /> regulatory agency should be contacted prior tai the tredtmerit and/or <br /> ..disposal. of .the:. sCi.l -curt:gib s <br /> i <br /> Upon.. completion idt the dril1i'hg operations,: each soil; boring <br /> is backfilled with a sand/cement slurry (containing three percent <br /> bentonite) and pressure grouted to reduce the potential, development <br /> of voids.. Due to: the nature and consistency of sand/dement slurry ; <br /> mixtures, partial settlement can occur resulting in thei development , <br /> of voids or depressions at the surface. In the event partial <br /> Fi8siio: 'I <br /> odRstd: . .V'i9alip.. <br /> !f d ` <br /> ' i , <br />