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F <br /> ARZ��� <br /> IWorking To Restore Nature <br /> I <br /> Underground Fuel Tank Field Manual, October, 1989. Well completion depth will be based on <br /> the setting of the well screen 15 feet below and five feet above the saturated zone in order to <br /> allow for seasonal fluctuations in water level However, if five continuous feet of clay are <br /> encountered below the point of saturation, the well will be terminated at that depth <br /> Wells will be constructed of two-inch diameter F480 threaded PVC screen/casing No glues or <br /> solvents will be used Screen slot size will be 0 010-inch Sand pack material will be #2 pre- <br /> washed silica sand The well annulus above the sand pack will be sealed to approximately two <br /> feet below the surface with neat cement, in accordance with PHS/EHD guidelines The upper <br /> two feet of the annulus will be capped with concrete <br /> Soil borings not completed as monitoring wells will be backfilled with neat cement using a <br /> tremae pipe <br /> I <br /> Drill cuttings and core samples will be logged continuously for characterization of contamination <br /> and soil type by an experienced geologist using the Unified Soil Classification System. <br /> Descriptions of soils encountered and monitoring well construction details will be recorded on <br /> boring/well logs Soil samples will be collected from each boring at five foot intervals, <br /> beginning at a depth of five feet Samples will also be collected within the saturated zone for <br /> iithologic characterization <br /> Soils encountered will be monitored for organic vapors by placing a small amount of <br /> representative material in a sealed container, then measuring the concentration of volatile <br /> organics collected in the head space of the container with a photoiomzation detector (PID) <br /> calibrated to the benzene molecule The values obtained at each measurement point will be <br /> recorded on the boring logs Soil cuttings generated during the drilling process will also be <br /> screened for the presence of organic vapors using a PID <br /> The soil cuttings will be stockpiled on site underlain and covered with six mil plastic in a <br /> location consistent with site operations. Soil cuttings and purged groundwater will be disposed <br /> of in a timely and appropriate manner after reviewing the analytical results and obtaining agency <br /> approval <br /> Soil Analysis <br /> To further delineate the vertical and lateral extent of soil contamination one soil sample from <br /> each boring will be submitted for laboratory analysis Soil samples submitted for analysis will <br /> be selected based on lithologic observations and obvious signs of contamination (1 e , PID <br /> readings, odors, and/or soil discoloration) <br /> Samples will be collected, preserved and transported under chain-of-custody in accordance with <br /> RESNA's soil sampling protocol. Soil samples will be analyzed for benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), total petroleum hydrocarbons as gasoline (TPHg), and total lead <br /> 0W05961REP0RTS1wPA-493 twL 3 <br />