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T41-j . z6.14 a [I , . ni j F" . jr, <br /> for sampling were selected based on proximity to the site and accessibility to the sampling <br /> crew. WCC and DDRW-Tracy personnel performed field verification to check the location <br /> Of the wells selected for sampling. Once all wells were located, DDRW-Tracy personnel <br /> contacted each private well owner and requested permission to sample their well(s). Eleven <br /> of the wells sampled are located downgradient of the site, as shown on Figure 5-1. Two <br /> wells identified as wells 10-D and 10-I on Table 5-1, located upgradient of the site, were also <br /> sampled. Those two wells were sampled based on recommendations by DDRW-Tracy <br /> personnel to satisfy the request of the private well owner. <br /> 5.2.0.2. Groundwater samples collected from the 13privately ownedwells were submitted <br /> to ETC for chemical analysis. Each of the private )veils was sampled and analyzed using the <br /> analytical methods indicated on Table 5-2. A 06plicale groundwater sample was collected <br /> from Well 2 (J. Rose) located at 25516 S. bania,Ro`ad; the duplicate sample was identified <br /> as LM 211 on the chain-of-custody sheet submitted to-the laboratory. Included in Appendix <br /> G aree the laboratory data sheets and the Chain-of-custody documentation. <br /> '%iW 5.2.1 Volatile Organic Compounds <br /> 5.2.1.1. The results of the VOC analyses performed on the samples collected from the 13 <br /> private wells are summarized in Table 5-3. Low levels of carbon tetrachloride were detected <br /> in well 1 (G, Robertson 25080 S.'Ban t1a Road) and well 2 (J. Rose 25516 S. Banta Road) at <br /> concentrations of 0.971 pg/I and 1,99 pg/l (1.96 pg/1 duplicate), respectively. The established <br /> EPA MCL value for carbon tetrachloride is 5 pg/l. Chloroform was detected in well 11 (A, <br /> Pombo 26432'S.,Banta Road) at a concentration of 0.652 pg/1. Chloroform is one of four <br /> trihalomethane compounds that have a combined EPA MCL of 100 pg/1. TCE was detected <br /> above the MCL value"of 5.,p'g/l in wells 2 and 4 at concentrations of 6.2 pg/1 and 6.18 pg/1 <br /> (duplicate) and 6.93 pg/1,'respectively. PCE was detected only in well 4 (Raspo AG-2) at <br /> a concentration of 2.42 pgp. No other VOCs (halogenated or aromatic) were detected in any <br /> of the groundwater samples analyzed from the 13 private wells. <br /> 5.2.2 Total Petroleum Hydrocarbon (Diesel) Analyses <br /> 5.2,2.1. Diesel (modified EPA Method 8015) was not detected in any of the samples <br /> collected from the 13 privately owned welts. <br /> QWws�o.rtlDrnkw.txra <br /> 5-4 <br /> M071092Dfl.n <br />