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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 Solonist 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]). I <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 <br /> sample 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 /> 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=prl-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 meniscus. 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 /> C%ATC Quarterly GW Monitoring R002 <br /> eport-3rd <br /> Stop No. 132 <br /> Quik Stop Markets, Inc. <br /> 1V101ECTSIOUIK STOP MKTSIOS 132'R r1s\2 Z11111r2OCIVIp1 ATC Project No.75.62503.3203 <br /> November 11,2002 <br />