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13 September 2012
<br /> AGE-NC Project No.99-0682
<br /> Page 9 of 17
<br /> is a summary of the analytical results:
<br /> • TPH-g were detected in samples collected from MW-1 A, MW-6, MW-7, MW-8, and
<br /> MW-10 at concentrations ranging between 160 pg/I (MW-6) micrograms per liter
<br /> (Ng/1) and 180,000 pg/l (MW-1A).
<br /> • BTEX compounds were detected in samples collected from MW-1A, MW-7, MW-8,
<br /> and MW-10 at maximum concentrations(benzene (MW 1 A) and 31 500 g/81 t tal OxOy xylenes
<br /> toluene (MW-1 A), 4,800 pglI ethY
<br /> (MW-1A).
<br /> • Tertiary amyl methyl ether (TAME) was detected in samples collected from wells
<br /> MW-1A, MW-7, MW-8, and MW-10 at a maximum concentration of 29 pg/l (MW-8).
<br /> • 1,2-dichloroethane(1,2-DCA)was detected in samples collected from wells MW-1A,
<br /> MW-7, MW-8, and MW-10 at a maximum concentration of 65 pg/l (MW-8).
<br /> • Various dissolved metals (barium [Ba], aluminum were deltected[Cql, iron [Fel,
<br /> n groundwater
<br /> magnesium[Mg],manganese[Mn],and sodium[Na]) e
<br /> samples collected from wells MW-1 A, MW-6, MW-7, and MW-8,with the exception
<br /> of from MW- Barium
<br /> inwells MW 6MW 7, a d MW 8 wee allbelow theiir
<br /> cs 7
<br /> a
<br /> andd AI concentrations
<br /> respective State of California Primary Maximum Contaminant Levels (MCLs) for
<br /> drinking water; however, the concentration of Al in well MW-1 A was just above the
<br /> State of California Primary MCL and all concentrations of Al were above the State
<br /> of California Secondary MCL. Concentrations of Fe and Mn detected in wells
<br /> MW-1A, MW-6, and MW-7 were significantly above the State of California
<br /> Secondary MCLs for drinking water. Concentrations of Ca, Mg, and Na all appear
<br /> to be within normal background levels. Hexachrome (CrVI)and chromium (Cr)were
<br /> not detected above laboratory reporting limits in the samples collected (Table 4).
<br /> • Anions (bromate, bromide, chloride, nitrate, nitrate as nitrogen, nitrate as NO3-,
<br /> sulfate, ammonia, and TDS) were detected in the samples collected from wells
<br /> MW-1A, MW-6, MW-7 and MW-8. Bromate was detected in samples collected from
<br /> wells MW-1A, MW-6, and MW-8 at concentrations ranging between 1.55 mg/I
<br /> (MW-1A) and 2.86 mg/I (MW-6). Bromate concentrations were above the State of
<br /> California Primary MCL of 0.01 mg/l for drinking water. Additionally, the laboratory
<br /> detection limit for bromate (1.0 mg/1) was above the Primary MCL of 0.01 mg/l. All
<br /> other anions with established MCLs, were below their respective Primary and
<br /> Secondary MCL (Table 5).
<br /> Advanced GeoEnvironmental,Inc.
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