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Crevlogccal7"erlcrcicslitc Page 4 <br /> Groundwater Monitoring Report <br /> Project No 724 2 <br /> August 27, 2004 <br /> is suspected, a clear disposable bailer is used toau a the interface No free-floating product <br /> g g gp t <br /> was observed during this monitoring event <br /> ' <br /> Stagnant water in the well casing was purged using a <br /> dedicated W attera pump as recorded in <br /> the field logs (Appendix C) The rate of well purging was monitored The wells were purged <br /> ' of at least three casing volumes until the groundwater parameters (temperature, conductivity, <br /> and pH) had stabilized (Appendix C) Well MW-110 de-watered before three well volumes <br /> ' were removed This indicated that water representative of actual aquifer conditions was <br /> entering the well Groundwater parameter stabilization was characterized by three successive <br /> readings within 10% variance <br /> ' Before a sample was collected, the water level was allowed to recharge to at least 80% of the <br /> initial level All purge water removed from the monitoring well was placed in a properly <br /> ' labeled 55-gallon DOT (Department of Transportation 17-H) approved container and is <br /> temporarily stored on-site <br /> ' A dedicated Watters pump was used to collect each sample <br /> Water samples were transferred in a manner that minimizes sample aeration during transfer <br /> of the sample into 40-m1 VOA vials preserved with hydrochloric acid All samples were <br /> checked for headspace bubbles, labeled, inserted into foam holders and placed into an ice <br /> chest cooled to 4°C for transport to the laboratory <br /> The sampling technician, while collecting all samples, wore disposable gloves <br /> ' A chain of custody document, listing all samples collected and their intended analyses, <br /> accompanied the samples from field to the laboratory, thereby providing a means to track <br /> their movement and ensure their integrity <br /> ' 1.3 Laboratory Analyses <br /> The groundwater samples collected on April 29, 2004, were delivered to Sherwood Labs of <br /> Hilmar, California (certification #1400) for analyses of <br /> I • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX), MTBE by EPA method 8021(B) <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(M) <br /> IThe detection limits for the above analyses are listed in Table 5 of Appendix A, while the lab <br /> analytical results are presented in Appendix B <br /> As required under AB2886, the laboratory data was submitted electronically to GeoTracker <br /> on June 18, 2004 (confirmation number 1800182342) and groundwater elevation was <br /> submitted electronically to GeoTracker on July 7, 2004 (confirmation number 9999790787) <br />