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1 <br />' 05 December 2002 <br /> AGE-NC Project No 02-0964 <br />' Page 4 of 7 <br />' 3.0. PROCEDURES <br /> On 28 October 2002,ground water monitoring and sampling were performed at each of the three on- <br /> site wells Field work was performed in accordance with guidelines established by the California <br /> Regional Water Quality Control Board (RWQCB) for investigation of underground storage tank <br /> (UST) sites <br />' 3 1 WELL MONITORING AND EVACUATION <br />' The depth to ground water was measured in each well from the top of the well casing to the nearest <br /> 0 01 foot utilizing a Solinst water level meter, the ground water elevation was calculated by <br /> subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) <br /> I After water levels were measured approximately 6 gallons of ground water a minimum of three <br /> pP Y g <br /> casing water-volumes per well) were evacuated (purged) from the wells utilizing dedicated, <br /> polyethylene disposable bailers Temperature,pH and conductivity were measured for stabilization <br /> at regular purge-volume intervals using an Oakton water analyzer Field data and logs are provided <br /> h m Appendix B Purged groundwater was containerized in 55-gallon drums and was stored on-site, <br /> pending proper disposal <br /> I3 2 GROUND WATER SAMPLING <br />' Water samples were collected from each monitoring well using the dedicated,disposable bailers after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume The samples <br /> were transferred into three 40-m1 EPA-approved volatile organic analysis (VOA) vials containing <br /> I 0 5 ml 18% hydrochloric acid as a sample preservative and one-liter amber bottles lacking <br /> preservative Care was taken to ensure that visible air bubbles were not present in the vials after <br /> filling and capping The ground water sample containers were subsequently labeled with the well <br /> designation, date, time, and sampler's initials <br /> I33 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> shipped to Cal Tech Environmental Laboratories(CTEL)a California Department of Health Services <br /> (DHS)-certified analytical laboratory The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified and <br /> Advanced GeoEnvironmental,Inc <br />