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12 June 1.996 . <br /> AGE-NC Project No. 95-Q130 <br /> Page 3 of 5 <br /> -3.0 QUARTERLY MONITORING PROCEDURES <br /> MONITORING WELL PURGE PROCEDURES <br /> On­` April 1996,the depth to ground water in each monitoring well was measured to the nearest <br /> ter..The relative ground water elevations were calculated <br /> 0.01 foot utilizing a Salist water level me <br /> .subtractingthe depth to ground water from the relative casing elevations surveyed from a <br /> '' i Table 1- Relative Ground Water Elevations). Relative ground water <br /> r, ; ,_•:-.;.::;`.:tem�orary.:benchmarC <br /> relevations were plotted and contoured on a scaled site map (Figure 3 - Relative Elevation Ground <br /> Water Map); . <br /> JAfter water levels were measured, approximately 10 to 14 gallons of water (minimum of three well <br /> .-�,;T,.,_:.,:• olumes) .were removed. from wells MW-1• through MW-S utilizing a <br /> rundfos Redi-Flo II <br /> a tsubmersible pump,Temperature, pH and conductivity were measured at regular intervals from each <br /> } well using an ICM model 52200 water analyzer. Stabilization data and field logs are included with <br /> Q,ppendix A. Purged ground water was stored in 55-gallon drums and stored on <br /> in an area <br /> _ tnaccessible,to the general public. <br /> -GROUND WATER SAMPLING <br /> - Moniforing wells MW-1 through MW-5 were allowed to recover for a minimum of one hour prior <br /> to.Sample collection. Water samples were collected utilizing dedicated, disposable polyethylene <br /> n rope. Sufficient round water sample was collected from each well to fill three <br /> �- - -bailers and new.nylo p g <br /> - =.40-m1 EPA vials containing hydrochloric acid as a preservative for the samples,.and aone-liter <br /> ' amber bottle lacking hydrochloric acid. Care was taken to ensure that visible air bubbles were not <br /> resent in the VOAs after filling and capping. Ground water sample containers were labeled with <br /> "~ :the well designation, date, time, and sampler's initials. <br /> - - '3.3: : , LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each groundwater sample was logged on a chain-of-custody form, placed in a chilled container and <br /> •� .-...,r• <br /> ',­­'..transportedto,Castle Analytical Laboratories (CAL), a California state-certified laboratory for <br /> ;.•.analysis of.hazardous materials. Each sample was analyzed for total petroleum hydrocarbons <br /> �..,quantified•as gasoline (TPH-g), volatile aromatics (benzene, toluene, ethyl benzene and xylene: <br /> BTE&X, and methyl-tertiary butyl ether(MTBE) in accordance with EPA methods 5030 and 602, <br /> ec ivel The laboratory report (CAL Laboratory No. 742) and chain-of-custody forms are <br /> sp, t y. . rY P <br /> presented in-Appendix B. <br />