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2 2 2. Groundwater Monitonng, Samohng and Anaivsis <br /> to <br /> On November 5, 1998, groundwater from the newly-installed wells was monitored and sampled <br /> Upon arrival at the site, each of the wellheads was inspected, unlocked and opened Depth-to- <br /> groundwater was measured in each of the wells using a water level indicator capable of <br /> measuring groundwater to within 0 01 foot <br /> Following the groundwater level measurements, each of the wells was purged and sampled The <br /> wells were purged using a battery-operated downhole pump until at least three well casing <br /> volumes were extracted and/or after groundwater temperature, pH and electrical conductivity <br /> values had stabilized Following well purging, groundwater was sampled from the wells using <br /> dedicated disposable bailers and laboratory-supplied containers Each sample was labeled, <br /> packaged in an iced cooler and transported under chain-of-custody documentation to Kiff <br /> Analytical, LLC (Kiff), a state of California certified hazardous waste testing laboratory <br /> (Certification #2236) <br /> Kiff analyzed each of the groundwater samples for TPH-as-diesel, TPH-as-gasoline, BTEX and <br />' MTBE by Modified EPA Methods 8015 and 8020 To test for the alcohol- and ether based <br /> oxygenate compounds, Kiff also analyzed each of the groundwater samples for MTBE, Di- <br /> isopropyl <br /> risopropyl ether (DIPE), Ethyl tertiary butyl ether(ETBE), Tertiary amyl methyl ether (TAME) and <br /> Tertiary butanol (TBA) by EPA Method 8260 <br /> Groundwater samples from each of the wells were also submitted to BioLogic Biotechnical <br /> Laboratory (BioLogic) for physiochemical and microbial analyses BioLogic analyzed each of the <br /> three groundwater samples for pH and concentrations of nitrogen (nitrate, nitrite and ammonia), <br /> phosphorous (as ortho-phosphate) and potassium In addition, BioLogic performed general <br /> (heterotrophic, nonspecific) and selective (diesel specific) plate count enumerations <br /> In the field, dissolved oxygen measurements were taken from the groundwater at each of the <br /> xY9 <br /> three wells using a LaMotte titration test kit By the azide modification of the Winkler Method, <br /> dissolved oxygen values ranged from 1 5 parts per million (ppm) in MW-2 to 2 4 ppm in MW-3 In <br /> general, the dissolved oxygen results indicate a direct correlation between oxygen deficiency and <br /> concentration of petroleum hydrocarbons The dissolved oxygen results for all of the wells are <br /> included in Table 4 <br /> i8 <br /> I <br />