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S E C 0 R <br /> � E , <br /> Ms. Lori Duncan r <br /> San Joaquin County EHD <br /> May 24, 2005 <br /> Pagei 4 of 4 <br /> II I <br /> Natural attenuation parameters will be analyzed in samples collected from all groundwater <br /> monitoring wells as part of the quarterly groundwater sampling event(s). Refer to Table 3 <br /> below for parameters and testing methods. <br /> Table 3: Analytical Requirements for Secondary Natural Attenuation Parameters <br /> 'M <br /> Analyte Method �. <br /> pH 11 EPA Method 150.2 or Field instrument <br /> Dissolved oxygen (00) EPA Method 360.1 or Down-hole field instrument <br /> Redox Potential (ORP) Field instrument I 'I <br /> Ferrous iron Field HACH Kit <br /> The following analysis will be added during the first groundwater monitoring event and <br /> then annually thereafter for seven of the 12 wells: M <br /> Sulfate (SOQ) EPA Method 300 <br /> Nitrate (NO3) EPA Method 300 <br /> �1 a <br /> DataOrom Table 3 analyses will be used to assess the effects of!the SVEIAS system on <br /> natural attenuation of groundwater contamination. Data will be!�compared to previous <br /> available data and will be used to estimate the duration of System operation. Monitoring <br /> of nal <br /> ural attenuation parameters in wells will likely be modified asra better understanding <br /> Of plume degradation and site conditions is established. I}� <br /> If you have any questions or comments, please feel free to <br /> contact me directly at (925) <br /> 299-9300, extension 222. <br /> k <br /> Sincerely, <br /> SECOR International Incorporated <br /> Maria Sternad, PE ; <br /> Senior Engineer <br /> Figure 1 — Geocon Map, Petroleum Hydrocarbons in Groundwater:May 2004 <br /> {{ <br /> cc: 1� Saiyed Ali, Associate Engineering Geologist, Caltrans L I <br /> 1:1CAL iPNANS1Stockton-Shop 101GW Monitoring\Letter to SJ Ccunty_Final.doc I ' May 24,2005 <br /> ProjecbNo.940T.43148.00 I SECOR International Incorporated <br /> �p ip <br />