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' 20 May 1995 <br /> AGE-NC-95-0103 <br /> Page 3 of 4 <br /> _ x _ <br /> 3 3 GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Water samples were collected from MW-2 and MW-3 using new disposable bailers The <br /> ' samples were transferred to 40-m1 EPA vials preserved with hydrochloric acid Each sample <br /> was logged on a chain-of-custody form; placed in a chilled container and transported to <br /> McCampbell Analytical Inc (MAI) in Pacheco, California No samples were collected from <br /> tMW-1 or MW-4 <br /> ,Each sample was analyzed for TPH-g and BTE&X to accordance with EPA methods <br /> ' 5030/8015 and 602, respectively The laboratory report and chain-of-custody are presented <br /> in Appendix B <br /> 4.0. FINDINGS <br /> s <br /> t41 RELATIVE GROUND WATER_ELEVATION AND GRADIENT <br /> The relative elevation of ground water in each well was calculated by subtracting the ground <br /> water depth from the surveyed relative casing elevation (Table 1) The ground water <br /> elevation rose approximately one foot between January and March 1995 Free product <br /> thickness was measured at 0 01 inches in both MW-1 and MW-4 <br /> _ n Ground water flow direction at the site is generally to the southeast (Figure 3) However, <br /> a prounounced ridge is present between MW-1 and MW-3 The ridge was not present <br /> ' during the previous sampling in January 1995 <br /> 4 2 ANALYTICAL RESULTS <br /> TPH-g was detected in the water sample from MW-3 at 2,700 gg/l (ppb parts per billion) <br /> BTE&X were detected in MW-3 at concentrations of 80 ppb, 3 9 ppb, 28 ppb and 45 ppb, <br /> respectively No petroelum hydrocarbons were detected in the sample form MW-2 The <br /> ' analytical results of the samples are listed in Table 2 The laboratory report and,chain-of- <br /> custody are included in Appendix B <br /> - ' 5.0. CONCLUSIONS & RECOMMENDATIONS <br /> ' 5 1. FREE PRODUCT - <br /> Only 0 01 inches of free product was measured in May 1995 It appears that free product <br />