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' FIELD PROTOCOL <br /> ' The static water level and floating product level, if present, in each well that contained water was measured <br /> with an ORS Interphase Probe Model No 1068018 or Solomst Water Level Indicator, these instruments are <br /> ' accurate to the nearest 0 01 foot These groundwater depths were subtracted from wellhead elevations, <br /> including corrections for product thickness, when necessary, for gradient evaluation by multiplying product <br /> thickness (PT) by a correction factor 0 8 and subtracting from the DTW (Adjusted DTW = DTW - [PT x <br /> ' 0 8]) <br /> Water samples collected for subjective evaluation were collected by gently lowering approximately half the <br /> ' length of a new disposable or Teflon®bailer past the air-water interface(if possible)and collecting a sample <br /> from near the surface of the water in the well The samples were checked for measurable floating <br /> hydrocarbon product All Teflon® bailers are triple washed with Alconox® and triple rinsed with distilled <br /> t water prior to use <br /> Before water samples were collected from the groundwater Monitoring Wells, the wells were purged until <br /> stabilization of the temperature, pH, and conductivity were obtained Approximately three well casing <br /> volumes were purged before those characteristics stabilized The quantity of water purged from each well <br /> ' was calculated as follows <br /> 1 well casing volume=p?h(7 48)where <br /> r=radius of the well casing in feet <br /> h=column of water in the well in feet <br /> (depth to bottom- depth to water) <br /> ' 7 48=conversion constant from cubic feet to gallons <br /> Gallons of water purged/gallons in 1 well casing volume=well casing volumes removed <br /> After purging, each well was allowed to recharge to at least 80% of the initial water level Water samples <br /> were collected with a new disposable or Teflon® bailer, and carefully poured into 40-milliliter (ml) glass <br /> ' vials, which were filled so as to produce a positive meruscus Each vial was preserved with hydrochloric <br /> acid, sealed with a cap containing a Teflon® septum, and subsequently examined for air bubbles to avoid <br /> headspace which would allow volatilization to occur The samples were promptly transported in iced � <br /> storage in a thermally-insulated ice chest, accompanied by a Chain of Custody Record, to a California- <br /> Certified Laboratory <br /> [998 lst Quarter Groundwater Monrtonng Report <br /> ATC PLS114PLEASANT0fMdmtn Task4LEHRMAN\QUMST0P1132198rpt lid dw[July 20 1998] <br /> 1 <br />