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r <br /> r <br /> APPENDIX 1 <br /> r GROUNDWATER MONITORING,SAMPLING, <br /> AND SAMPLE HANDING PROTOCOL <br /> r .� l�jotifirauons <br /> Prior to performing any field work, the client,regulatory agency,and property <br /> r owner/manager with j unsdiction over the subject site are notified Notifications are made a <br /> minimurn of 48 fours prior to sampling, or as required by the client or regulator <br /> rI W_pterLevel Measprement$ <br /> Prior to performing purge or no-purge sampling,water level measurements are collected <br /> raccording to the following procedures <br /> * All wells are checked for phase-separated hydrocarbons with an acrylic batter or <br /> r oil/water interface meter <br /> • To avoid cross contamination, water levels are measured starting with the <br /> lustoncally "cleanest" wells and proceeding to the historically "dirtiest" <br /> r Water levels within each well are measured to an accuracy of �Q Ol 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 /> r 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 time interval on the same day to <br /> r obtain accurate measurements of the potentiometnc surface <br /> • All measurements are reproduced to assure validity, and measuring equipment is <br /> decontaminated between wells <br /> r3. Phase ar Hy4EqMban <br /> rIf 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 /> r - 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 /> r an electronic water level meter is used to measure the depth to the tap of the wafter <br /> and a Clear bailer is used to measure the PSH thickness <br /> r The potentiornmenc surface elevation is calculated as <br /> TOC -DTW + 0 74PT <br /> r Where TOC W top-of-casing elevation, DTW=depth to water(interface), and PT=PSH <br /> thickness <br /> r <br /> r <br />