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ANNUAL REPORT <br /> 1998 GROUNDWATER MONITORING <br /> FORMER AMERICAN FOREST PRODUCTS COMPANY FACILITY <br /> STOCKTON, CALIFORNIA <br /> APPENDIX A <br /> GROUNDWATER SAMPLING METHODOLOGY <br /> A 1 GROUNDWATER SAMPLING PROCEDURES <br /> I <br /> I <br /> Groundwater samples were collected in accordance with pertinent applicable sampling <br /> protocols, details of which are presented below <br /> A 1 1 Static Water Level Measurement <br /> During groundwater elevation monitoring and before sampling, the static water level was <br /> measured in each monitoring well using an electric water level indicator Measurements were made, <br /> recorded, and repeated until at least two consecutive depth readings were within 0 01 feet Water <br /> level data were recorded to the nearest 0 01-foot from a reference point marked on the top of the PVC <br /> casing All reference points were surveyed by a licensed surveyor Before and after each use, the <br /> measurement device was thoroughly rinsed with deionized water <br /> A 1 2 Well Evacuation <br /> Prior to sample collection, the monitoring wells were purged with a portable submersible <br /> pump Purging of the well was performed in order to obtain samples representative of groundwater <br /> in the formation Monitoring wells were purged until <br /> (1) a minimum of three casing volumes were removed from the well, and <br /> (2) the field-measured temperature, pH, and specific conductivity stabilized <br /> Casing volume is the volume of water that occupies the well casing from the bottom of the well <br /> to the water table One casing volume (CV) can therefore be calculated as <br /> A-1 I1DM SACIISYSkWORDPROC\sac1044MLSc19809_06doc <br /> DAMES&MOORE <br />