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' 02 October 2000 <br /> AGE-NC Project No 98-0465 <br /> Page 5 of 9 <br /> ' wells relative to the tops of the well casings The ground water elevations and gradient were <br /> determined from these data (Table 1) <br /> After recording water level measurements, a disposable bailer was used to purge each monitoring <br /> well of standing water Approximately 8 gallons of water(nunimum of 3 casing-water volumes from <br /> ' submerged casing)were removed from each well Ground water temperature, pH and conductivity <br /> were measured at regular intervals during purging using a Hydac water analyzer Field sheets and <br /> data are included in Appendix C Purged water was stored on-site in labeled, 55-gallon DOT- <br /> approved drums <br /> ' 3 7 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers Each <br /> ' water sample was transferred into 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a <br /> sample preservative, and into 1-liter amber bottles without sample preservative After collection,the <br /> samples were properly labeled,placed in a chilled container and transported under chain-of-custody <br /> to McCambell Analytical Laboratories, Inc (MAI), and were analyzed for <br /> G TPH-g and TPH-d in accordance with EPA Method 8015 Modified, <br /> ' o BTEX and MTBE in accordance with EPA Method 8020, and <br /> DIPE, ETBE, MTBE, TAME and TBA in accordance with EPA Method 8260 Modified <br /> ' 38 SURVEYING <br /> The casing elevation of each well installed for the Country Club Food and Fuel investigation was <br /> surveyed relative to City of Stockton Bench Mark 9 259 On 18 July 2000, a California state-licensed <br /> survey engineer from Baumbach&Piazza,Inc surveyed a reference point on the top of each ground <br /> water monitoring well at the site to the nearest 0 01-foot relative to the City of Stockton Bench <br /> ' Marks and Description at 3 32 feet above mean sea level (msl) The results of the monitoring well <br /> survey are contained in Table 1 The surveying report (Baumbach & Piazza) is presented in <br /> Appendix D <br /> 39 RECEPTOR WELL SURVEY <br /> ' A survey was performed to identify Potential receptor wells near the subject property YThe City of <br /> Stockton and Califorma Water Service were contacted for the location and construction <br /> Advanced GeoEnvironmental,Inc <br />