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C <br /> Quarterly Monitoring Report Janizary 13, 1989 <br /> Former UNOCAL Station No. 2859, Stockton, California AGS 3803.2-2 <br /> concentrations in well MW-3 remain essentip-11., unchanged and <br /> slightly above recommended maximums for safe drinking water <br /> established by the California Department of }iealth Services. <br /> Water from well MW-2 greatly exceeds these reco=.gnded action <br /> ).evels; for example, benzene was present at a conre-ltration of <br /> 9.4 parts per mlillon. Because well, MW-2 is locates; near the <br /> property line in the downgradient direction, it is likely that <br /> hydrocarbon- contaminated ground water has migrates_ offsi.te. <br /> Applied GeoSystems recommends installing two additional. offsite <br /> V') monitoring wells to delineate the extent of hydrocarbon <br /> contamination further. <br /> With your authorization we will forward copies of this report to <br /> Ms. Laurie Cotulla of the San Joaquin Local Health District, <br /> P. O. Box 2009, Stockton, California 95201, a,nd Mr. Gord,)n Boggs <br /> of the California Regional plater Quality Cartrol Board, 3443 <br /> Routier Road, Sacramento, California, 95827-3098. Please do not <br /> hesitate to call if you have any questions regarding this letter <br /> report. <br /> sincerely, <br /> ». Applied GeoSystems <br /> Barry I. Marcus <br /> Project Geologist <br /> F•. <br /> Gillian S. Holmes <br /> G.E. 2023 <br /> Attachments: Site Vicinity Map, Plate P-1 <br /> Generalized Site Plan., Plate P-2: <br /> Cumulative Results of Subjective Analyses, <br /> Table 1: <br /> Ground-Water Potentiometric Surface Map, <br /> Plate P-3 <br /> Analytical Results of Water Samples, Table 2 <br /> Chain of Custody Record <br /> Analysis Reports (3 pages) <br /> 3 <br />