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JUN� 17 '96 12:20 FROM TO 912094683433 PRGE.003i005 <br /> Page 2 . • <br /> June t9Bg; <br /> In 1984,dry cleaning contamination was detected in routine presence of dry cleaning contamination in soils beneath all <br /> groundwater samples collected from the Lincoln Village three dry cleaning facilities and in shallow groundwater,In <br /> Maintenance District(LVMD)municipal supply well, addition,dry cleaning contamination was also detected in <br /> LVMD#I,located near the northeast comer of Benjamin municipal supply wells LVMDM2 and LVMD#6 This <br /> Holt Drive and Gettysburg Place(Figure 2).The Public contamination,like that of well LVMD#I.was attributed to <br /> Health Ser'vias,San Joaquin County,in conjunction with well casing leaks that permitted the dry cleaning fluids to <br /> the San Joaquin County Public Works and LVMD.initiated a enter each well. <br /> groundwatercontarnmation investigation to identify possible <br /> sources of contamination in this well. Phase Il investigations began in 1989 to further delineate the <br /> vertical and lateral extent of <br /> The investigation concluded that the contamination found in beneath Lincoln Comer.The investigations incclude�d tamoorng <br /> groundwater from LVMD#1 was likely caused by the other things,the performance of a soil vapor survey,the <br /> migration of dry cleaning fluids into the municipal supply sampling and testing of more soils,the installation and <br /> well from a nearby sanitary sewer line that serviced each of sampling of 1 I more groundwater monitoring wells(for a <br /> the three dry cleaning facilities at Lincoln Center.An total of 15 wells),a futtherinspection of wells LVMD#2 and <br /> investigation of the sanitary sewer limes near LVMD#1 LVMD#6 to assess their integrity,and the collection and <br /> revealed cracks,leaking joints,and a major sag in the sewer analysis of additional sewage samples from the sanitary <br /> line that allowed dry cleaning fluids to be released to soil sewer line. <br /> and shallow groundwater.The investigation also revealed <br /> major breaks in the protective casing of LVMD*l,which, The Phase 11 results identified three principal groundwater- <br /> in turn.permitted the dry cleaning fluids to enter the well. bearing zones beneath Lincoln Center:the A.B,and C <br /> zones.Groundwater samples collected from monitoring <br /> In June 1987,the RWQCB required that LPL perform wells installed during the Phase II investigation have <br /> further investigations into the source and extent of the revealed dry cleaning contamination in each of the three <br /> contamination detected in the LVMD wells.investigations zones. Details concerning prior investigations at Lincoln <br /> were undertaken in 1987 and 1988,which included,among Center are summarized in the draft Work Plan. <br /> other things,the sampling and testing of soils from beneath <br /> the three dry cleaning facilities and sanitary sewer lines,the the 15 Phase I and H groundwater monitoring wells are <br /> installation and sampling of four shallow groundwater currently sampled and analyzed on a quarterly basis as part <br /> monitoring wells,and the collection of sewage samples of an ongoing periodic groundwater monitoring program at <br /> from the sewer lines.The Phase I investigation confirmed the Lincoln Center. <br /> ' e " <br /> x <br /> I <br /> � • B •aer.s+Fe..y.w <br /> wa w. <br /> r � ¢mnq^a.wW..• <br />