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AK <br /> August 18, 1993 - � V VAN „ <br />. Unocal Service Station No 6981, Stockton, California Working To Restore Nature <br /> 1 samples will be submitted to a Unocal-approved laboratory, composited into one sample and <br /> analyzed The analytical results will be used to evaluate disposal options of the cuttings <br /> RESNA will apprise Unocal of their options for soil disposal <br /> Va or-Extraction Well Construction <br /> The approximate locations of the two proposed vapor-extraction wells are presented in Plate <br /> 2 The soil borings will be terminated at approximately 30 feet bsg, and the vapor-extraction <br /> wells will be constructed in the boring with thread-pointed, 4-inch-inner-diameter, Schedule <br /> 40 PVC casing No chemical cements, glues, or solvents will be used in well construction <br /> The screened portion of each well will consist of factory-perforated casing with 0 10-Inch- <br /> wide slots The well screen will extend from the total depth of the well to approximately <br /> 5 feet bsg The annular space in the well will be packed with pea gravel to a point <br /> approximately 1 foot above the slotted interval A bentonite plug will be added above the <br /> pea gravel and beneath the overlying cement/bentonite slurry The remaining annulus will <br /> be backfilled to grade with a bentonite-cement slurry The vapor-extraction wells will be <br /> protected by a traffic-rated, water resistant, cast-aluminum utility box A schematic diagram <br /> of the vapor-extraction well design is presented on Plate 3 <br /> Laboratory Analyses <br /> RESNA will submit two soil samples from each boring for chemical analyses to a laboratory <br /> approved by Unocal and certified by the State of California These soil samples will be <br /> analyzed for TPHg by EPA Method 8015 and for BTEX by EPA Method 8020 The four <br /> samples collected from the drill cuttings will be composited into one sample by the <br /> laboratory and will also be analyzed for the constituents listed above using the same <br /> laboratory methods These samples will be submitted on a regular, 2-week turn-around <br /> time <br />�r <br /> 38032-14W 8 <br />