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,I <br /> • TRPH was not detected in groundwater samples collected from Parcel III; <br /> • VOCs were not detected in groundwater samples collected from Parcel III; <br /> • Sulphur and sulfate concentrations in groundwater samples collected from Parcel III are <br /> detectable but not elevated; and <br /> • Sulfide is not present in Parcel III groundwater. <br /> 5.2 RECOMMENDATIONS <br /> ti Dames & Moore makes the following recommendations: <br /> • Fuels and petroleum waste products permanently or temporarily stored on site should be <br /> placed in secondary containment structures to prevent dispersion of petroleum <br /> hydrocarbons to the ground; <br /> J • IGroundwater monitoring wells should be resampled and analyzed for arsenic to determine <br /> if arsenic may be problematic; <br /> J • The remainder of the copper concentrate stockpile should be properly disposed or placed <br /> on a impermeable surface to prevent additional impacts on near surface soils; and <br /> • Installation of an impermeable surface along the conveyor system easement should be <br /> --1 considered to prevent additional impacts on near surface soils. <br /> .w <br /> • SAC29.013 21 December 20, 1991 <br />