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1 ! t ! k F * ! <br /> SS No . 6348 , Tracy <br /> PIER, 1/31/92 u, <br /> , In all borings, soil saabove the encounteredes were collected twater <br /> foot intervals and immediately <br /> table, using a California modified split spoonM sampler 1=n 30 <br /> �„Tith brass- sleeves - driven by ar14o-pound hammer falling 30 <br /> inches . Blow counts were recorded ' One b6ring-(MW=3 )"was-r --- -- <br /> continuous-ly-sampled. - -- <br /> - <br /> 'At - each -s amp 1 ing_�,I'iterva l , 'theme contents o f one <br /> six-inch sleeve was transferred into a zip An adbaac ntrs winch <br /> ting <br /> with a photoionization detector (PID) • 3 erred for <br /> -- - -- --sample,- .-retained__ in ,-its--brass_ sleeve, was then prep <br /> laboratory analysis by wrapping the ends- of- the--brass sleeve in- <br /> teflon foil and covered them with plastic <br /> en placed in ha coosamleler <br /> was labeled, placed in a ziplock bag, <br /> and with ice. Samples were selected for delivery to ChromaLab in <br /> San Ramon, California if PID readings and/or sample location <br /> determined it was frthat samplese to the Cstatehain-scertifody ied - <br /> documentation accompanied <br /> laboratory. " <br /> The ~soil samples were classified lithologically in <br /> accordance with the 'UnifiFed-Soil-.0lass if-icatxon sY a d well <br /> standard geologic techniques. Copies of boring log <br /> construction diagrams are attached as Appendix A. <br /> WELL CONSTRUCTION <br /> The we were-constructed=using=two-inch-diameter <br /> - - - , -==PVC --pipe Ywith._.._15 feet of screened PVC (0. 020-inch slot) which i2 <br /> was placed in the bottom of�the borehole-:=-=Sand,Tt(ri_ PSC_ <br /> - `Lonestar) -was=Poured=into the _annular space surrounding <br /> pipe to a height of one-half foot above the -top` of 'pellets twas <br /> interval . A two--foot thick layer of bentonite p annular <br /> placed-above-the-sand----and-hydrated.___--The -remaining <br /> e. <br /> space was filled with neat cement to near the ground raand <br /> The tops of the PVC were casing <br /> ngsecured <br /> with locking plugs <br /> enclosed in water-tight, <br /> The hollow stem augers were steam cleaned prior to - <br /> _ use in each boring . All soil cuttings were placedron,aand <br /> covered with,' plastic sheeting . Steam cleaning <br /> in <br /> generated during monvridrwell <br /> andinstallation <br /> on was <br /> rite 1pending <br /> 55-gallon DOT approeddrums <br /> appropriate disposal. <br /> were surveyed on July 11, 1991 .to the top <br /> The wells <br /> -4- <br /> ! <br />