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8.0 RECOMMENDATIONS <br />Potential environmental impacts for Audit area III include pesticides in soil and groundwater <br />from past agricultural use, heavy metals in soil and groundwater from possible receipt of river dredge <br />tailings, petroleum coke, and copper concentrate storage, and lowered pH values in soil from bulk coal <br />stockpiling operations. There is also potential for hydrocarbons and volatile organic compounds in soil <br />and groundwater beneath the site due to lubricant storage and fueling operations and the close proximity <br />of the Port of Stockton fuel terminal. The site is presently developed as a bulk materials distribution <br />facility. <br />The following recommendations are presented based on past land use and current on site <br />operations: <br />To evaluate potential impacts on soil from bulk materials stockpiling and handling, soil <br />borings should be conducted near the petroleum coke and former copper concentrate <br />stockpiles and beneath the conveyors. Soil samples should be analyzed for CAM metals <br />(STLC); <br />To evaluate potential impacts on soil from drum storage and fueling operations, soil <br />borings should be conducted near each of these areas. Soil samples should be analyzed <br />for purgeable and purgeable aromatic halocarbons, and total petroleum hydrocarbons; <br />To evaluate potential impacts in groundwater from current operations, two monitoring <br />wells should be installed. The wells should be placed both upgradient and <br />downgradient of existing operations. Groundwater samples should be analyzed for <br />CAM metals, chlorinated and organophosphate pesticides, total petroleum <br />hydrocarbons, purgeable and purgeable aromatic halocarbons. <br />If the establishment of baseline conditions is desired for this parcel, soil and <br />groundwater analysis should be expanded to include chlorinated and organophosphate <br />pesticides, elemental sulphur, and sulphates. Groundwater samples should also be <br />analyzed for sulfides. <br />PSA04.007 14