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1 <br /> !• H. KLEIN FELDER&ASSOCIATES <br /> File: w-2006-1 <br /> December 15, 1985 <br /> u-: Page 19 <br /> The surface impoundmen'_ to the north of the facility may be <br /> affecting the local ground water gradient by acting as a <br /> source of discharge or recharge for the ground water beneath <br /> the facility. <br /> a The noss�bility of unknown off-site sources should be <br /> Investigated further. Yncuiries should be made into the <br /> historical and current activities of the nearby surface <br /> i �• <br /> 1 impoundments and the fill area to the north of the <br /> �r <br /> `. facility. Samnles collected by Guild and analyzed by <br /> j <br /> California Water Labs contained toluene at 37.7 opb ir, the <br /> - V, 1 surface impoundment north of the excavation area. <br /> e Four additional ground water monitoring wells should be <br /> installed to further understand the extent of benzene <br /> migration in the ground water. Possible locations for the <br /> additional monitoring wells are shown on -late 3-1. <br /> e once the extent of benzene in the ground water has been <br /> - determined, recommendations for and necessary remedial <br /> measures can be '_ormulated. <br /> a All existing monitoring wells should be resampled and <br /> analyzed . for 9TX components at the same time any <br /> additional wells are sampled and analyzed. This round of <br /> shr�uld include major ion analyses on a select <br /> number of samples. <br />