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Ms. Anne P. Conner 8 10/9/2007
<br /> Pacific Gas&Electric Company
<br /> • Inorganic Anions (Br, Cl, F, NO3/NO2, SO4)— EPA method 300.1
<br /> • Nitrogen as Ammonia — EPA method 350.1
<br /> • Total Phosphate— EPA method 365.2
<br /> • Total and Dissolved Metals— EPA method 6010/6020
<br /> • Total Dissolved Solids (TDS)— EPA method 160.1
<br /> Total and dissolved metals will include Al, B, Ba, Ca, K, Mg, Mn, and Na. If possible,
<br /> ferrous iron and sulfide will also be analyzed through the use of Hach TM field test kits, and
<br /> an attempt will also be made to analyze field parameters (pH, DO, ORP, temperature and
<br /> turbidity). Depending on the volume of groundwater able to be collected at each location
<br /> and depth, it might be necessary to establish a priority on laboratory analysis, with first
<br /> priority on constituents of concern (CDCs) in the MRP.
<br /> Collected samples will be placed in coolers with ice until shipment.
<br /> Upon completion of sampling at each location, boreholes will be grouted with a cement
<br /> plus 5% bentonite powder slurry to surface.
<br /> 3.4 Intermediate/Deep Zone Soil Sampling
<br /> After completion of intermediate/deep zone groundwater sampling, intermediate/deep
<br /> zone soil sampling will be completed adjacent to the intermediate/deep zone groundwater
<br /> sample locations (Figure 3-1)2. Direct push or another effective drilling technology will be
<br /> used to collect soil samples from depths of 40, 50, 60, 70, 80, 90 and 100 feet bgs at each
<br /> sample location. Soil samples will be collected from each depth and location in
<br /> accordance with SOP EI-GS001, Standards for Conducting Subsurface Soil Sampling
<br /> While Drilling (Shaw, 2007a), or equivalent. Specifically, thin-walled (acetate) tubing will
<br /> be advanced through undisturbed soil to the specified sample depth. The tubing will
<br /> subsequently be removed and the specified sample interval will be capped with Teflon TM
<br /> film and plastic caps. A permanent ink marker will be used to mark the top and bottom
<br /> sample interval on each sample tube. A total of 21 samples will be collected and
<br /> analyzed for the following:
<br /> • Chloride and Sulfate— EPA method 300.1
<br /> • pH — EPA method 150.1
<br /> • Total Metals — EPA method 6010/6020
<br /> Total metals will include CAM17 metals (Ag, As, Ba, Be, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb,
<br /> Sb, Se, Ti, V, Zn) plus Al, Ca, Mn and Na.
<br /> Collected samples will be placed in coolers with ice until shipment. Upon completion of
<br /> sampling at each location, boreholes will be grouted to the surface with a slurry consisting
<br /> of cement plus 5% bentonite powder.
<br /> 4.0 SAMPLE ANALYSIS PLAN, DATA REVIEW AND PROCESS REPORTING
<br /> 'Collecting intermediate/deep groundwater samples before intermediate/deep soil samples will avoid
<br /> potential alkalinity effects on groundwater from soil borehole grouting.
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