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APPENDIX 1 <br /> GROUNDWATER MONITORING,SAMPLING, <br /> AND SAMPLE HANDING PROTOCOL <br /> 1. Notifications <br />' Prior to performing any field work, the client,regulatory agency, and property <br /> owner/manager with jurisdiction over the subject site are notified Notifications are made a <br /> minimum of 48 hours prior to sampling, or as required by the client or regulator <br /> 2. Water Level Measurements <br /> Prior to performing purge or no-purge sampling,water level measurements are collected <br />' according to the following procedures <br /> • All wells are checked for phase-separated hydrocarbons with an acrylic bailer or <br /> oil/water interface meter. <br /> • To avoid cross contamination, water levels are measured starting with the <br /> historically 'cleanest" wells and proceeding to the historically "dirtiest " <br /> • Water levels within each well are measured to an accuracy of t0 01 foot using an <br /> electric measuring device and are referenced to the surveyed datum(well cover or <br /> top of casing) When measuring to top of casing,measurements are made to the <br /> notched(or otherwise marked) point on casing If no marking is visible, the <br /> • measurement is made to the northern side of the casing <br /> • If possible, all wells are gauged within a short tune interval on the same day to <br /> obtain accurate measurements of the potentiometric surface <br /> • All measurements are reproduced to assure validity,and measuring equipment is <br /> decontaminated between wells <br /> E3. Phase Separated Hydrocarbon <br /> If phase-separated hydrocarbon(PSH) is encountered, its thickness in the well and the <br /> depth to the interface between the PSH and the water in the well are measured using one or both <br /> of the following methods <br /> E an electronic oil-water interface meter is used to measure the depths to the top of <br /> the PSH and to the top of the water, and/or <br /> • an electronic water level meter is used to measure the depth to the top of the water <br /> and a clear bailer is used to measure the PSH thickness <br /> The potentiometeric surface elevation is calculated as <br /> TOC -DTW + 0 74PT <br /> Where TOC=top-of-casing elevation, DTW=depth to water(interface), and PT=PSH <br /> thickness <br />