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1 <br /> 4' <br /> CONCLu IONS- <br /> ' As a result. of all of the work done to date, the following <br /> conclusions appear to be valid= <br /> ' 1. A "zero" line for both soil & water contamination has been <br /> defined to the east & south. This is confirmed by both the <br /> ' results of the soil-gas survey & monitoring wells #4 & #5, which <br /> were non-detect in both soil & water samples. PLATES XIII & XIV <br /> show rough contours on levels of benzene & gasoline from the <br /> latest groundwater samplings_ <br /> 2. The limits of soil & groundwater contamination have not yet <br /> been located to the north & west of the property. <br /> 3. All of the data collected to date continues to strongly <br /> suggest an offsite source or sources of contamination located to <br /> the north or west of the property. <br /> 4. Additional onsite investigative wozk does not appear to be <br /> Trarranted. <br /> b_1 <br /> RECO NDAxHONS <br /> 1. Include the new wells in the ongoing quarterly monitoring <br /> program, which should continue until a change in conditions <br /> warrants reevaluation. <br /> ' 2. Additional offsite work should be performed in an attempt to <br /> either identify another source of contamination, define the <br /> limits of the plume to the north & west, or both. Possible <br /> methods could include shallow soil--gas surveys, soil borings, <br /> hydropunch or BAT sampling, punch samples, or combinations of <br /> those. <br /> As our workload permits, a�ad when we receive permission from our <br /> client to proceed, we will begin a feasility study & cost <br /> analysis to determine the best approach to obtaining the ma imuum <br /> amount of information at the lowest cost. We uill keep the <br /> Couantr off lce updated or a our p °o ress. <br /> 6 a. .I ter &a Associates �af_5 G p <br /> OC o er 25, 1994 ��S OG�� <br /> ' cc �'1_ Sanchez 'ItL1�ti�J KltfER <br /> Both Thayer, RWQCB <br /> NO 850 , <br /> � oF CALI�Q�'Q <br /> 7 � ' <br />