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Stantec <br /> 2010 TIDEWATER STOCKTON WORK PLAN <br /> • Dissolved metals by EPA 6000/7000 Series (during first and third quarters only per the <br /> MRP) <br /> 2.2 SEPARATE PHASE HYDROCARBONS <br /> Sheen or measurable SPH were observed in 24 of a possible 76 wells throughout the Site in <br /> 2009. Sheen and SPH product were found in the DPE well area on the L&M OU, and north of <br /> West Weber Avenue in the Waterfront Towers parking lot, where deep B-Zone wells MW-43, <br /> MW-48, and MW-49 are located. Additional product was consistently measured on the northern <br /> section of the L&M OU just south of West Weber Avenue near shallow monitoring wells MW-9, <br /> and DPE-13 and deep monitoring wells MW-17, MW-54, and MW-55. <br /> During the most recent quarter, fourth quarter 2009, measurable SPH or SPH-sheen was <br /> observed in eight B-Zone wells. SPH thicknesses for deep B-Zone wells are summarized <br /> below. <br /> Well Identification SPH Thickness <br /> feet <br /> MW-17 Sheen <br /> MW-43 0.24 <br /> MW-46 Sheen <br /> MW-47 Sheen <br /> MW-48 0.01 <br /> MW-49 0.86 <br /> MW-50 29.19 <br /> MW-52 0.02 <br /> SPH removal activities are scheduled to be conducted quarterly (at a minimum) for on and off <br /> Site wells which repeatedly contain measurable thickness of SPH. <br /> 2.6 <br />