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GROUND WATER INVESTIGATION WORK PLAN <br />BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA <br />All sampling equipment will be decontaminated using a liquinox solution and water rinse after <br />uses between each monitor well. Wastewater generated during the well purging and <br />decontamination activities will be placed in 55-gallon DOT drums. The drums will be sealed <br />and labeled for temporary storage at the site. Disposal alternatives will be identified based on <br />analytical results of the water samples. <br />3.1.3 Task 3 — Sample Analyses <br />This task specifies and provides the rationale for the variety of analyses to be performed on the <br />samples collected in Task 2. <br />Analytical work proposed here will allow the assessment of: <br />Background ground water quality, <br />Vertical and lateral extent of ground water impacts (if any) from existing and past <br />stockpiling of sulfur prill, copper concentrate, petroleum coke, and coal. <br />The following summarizes the purpose and utility of the analytical methods to be performed on <br />selected samples collected at the Site. A matrix of soil and water analytical methods is shown <br />on Tables 1 and 2, respectively. <br />Soil Analytical Methods <br />Cation Exchange Capacity (CEC) (EPA Method 9081) — provides data to assess retention <br />of metals and acid neutralizing capacity of soils. <br />Total Organic Carbon (Methods SW 9060) — measures the total amount of organic <br />carbon (TOC), which is directly proportional to organic matter content. TOC is a <br />significant source of both organic and inorganic attenuation capacity. <br />Total and DI WET Cu (EPA Method 6010B and California WET-DI) — quantifies the <br />concentration of copper in soils and extract, respectively in the copper concentrate <br />storage area. <br />Total and DI WET Ni, V (EPA Method 6010B and California WET-DI) — quantifies the <br />concentration in soils and extract of these residual metals associated with petroleum <br />coke manufacture. <br />Soil and Ground Water Analytical Methods <br />pH (EPA Method 150.1 and 9045B) — measures the acidity due to hydrogen ions that are <br />free in solution within a mixture of sediment and water. <br />July 2005 Page 13 Environmental Risk Services Corp.