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f <br /> fAppendix A <br /> f <br /> FIELD PROTOCOL <br />� f <br /> The static water level and floating product level if present, in each dell that contained water was <br /> measured with an ORS Interphase Probe Model No 1068018 or Solonist Water Le"el Indicator <br /> these instruments are accurate to the nearest 0 01 foot These groundwater depths ,sere subtracted <br /> from wellhead elevations, including corrections for product thickness, when necessary, for gradient <br /> ' evaluation by multiplying product thickness (PT) by a correction factor 0 8 and subtracting from <br /> the DTW(Adjusted DTW=DTW- [PT x 0 8]) <br /> Water samples collected for subjective evaluation were collected by gently lowering approximately <br /> half the length of a new disposable or Teflong bailer past the air-water interface (if possible) and <br /> ' collecting a sample from near the surface of the water in the well The samples were checked for <br /> measurable floating hydrocarbon product All Teflon® bailers are triple washed with Alconox® <br /> and triple rinsed with distilled water prior to use <br /> ' Before water samples were collected from the groundwater Morutoring Wells the wells were <br /> purged until stabilization of the temperature, pH, and conductivity were obtained Approximately <br /> three well casing volumes were purged before those characteristics stabilized The quantity of <br /> water purged from each well was calculated as follows <br /> I well casing volume=pt'h(7 48)where <br /> r=radius of the well casing in feet <br /> h=column of water m 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 Mater level Water <br /> ' samples were collected with a new disposable or TeflonaD bailer, and carefully poured into 40- <br /> milliliter (ml) glass vials,-which were filled so as to produce a positive meniscus Each vial was <br /> preserved with hydrochloric acid, sealed with a cap containing a Teflon®septum and subsequently <br /> examined for air bubbles to avoid headspace which would allow volatilization to occur The <br /> samples were promptly transported in iced storage in a thermally-insulated ice chest accompanied <br /> by a Chain of Custody Record, to a California-certified laboratory <br /> 1 <br /> f <br /> 1997 31h Quarter Monitoring Report <br /> ATC PL511PLEASANT0NV�DMEV TASK\LLEiRMAMQUIKSTOP1132WPPLND A D0C[313193] <br />