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Page 2 a June 1996 <br /> PREVIOUS • <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#1, located near the northeast corner of Benjamin municipal supply wells LVMD#2 and LVMD#6. This <br /> Holt Drive and Gettysburg Place(Figure 2).The Public contamination, like that of well LVMD#1, was attributed to <br /> Health Services,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 /> groundwater contamination investigation to identify possible <br /> sources of contamination in this well. Phase II investigations began in 1989 to further delineate the <br /> vertical and lateral extent of the dry cleaning contamination <br /> The investigation concluded that the contamination found in beneath Lincoln Center.The investigations included,among <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 11 more groundwater monitoring wells(for a <br /> the three dry cleaning facilities at Lincoln Center. An total of 15 wells), a further inspection of wells LVMD#2 and <br /> investigation of the sanitary sewer lines near LVMD#I 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#1, which, The Phase II 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 II 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 /> Mws P LvnlDn Mwze <br /> LVMD.1 MW< A <br /> p MW20 Q <br /> WMD D <br /> cle." <br /> D � M <br /> L11V1 LIV.' 8 V <br /> M 8 N r 8 <br /> g N M O1 U <br /> N <br /> QDIFeeNvW a c ' MWIE gA MWB <br /> F.Flmel <br /> X GnClwlen +_ W <br /> X <br /> J Yh <br /> K <br /> L MW10 <br /> M a I \ <br /> CMerm iF IXPLANATON <br /> {. Ou 51eMon ✓# Nwa f <br /> { MW3� wne pAO1FW AVf1A1 ® Unwin VineOa Mein2rerca ob01c1 well(groulo0) <br /> Econ GeSh0en p Locellm dfo—r Ory clewnlry owmtlon <br /> y, ' <br /> uw werK ) A Meneole eM menede IaEpl <br /> M WitY.kM) <br /> -�- sew..nre.,,n dl.nlm dtrow <br /> Q A-:ax monlroNq well <br /> wa vwn0 O B zoM n-11"W well <br /> w,reO <br /> C.. wen <br /> uwa +n t Evcn Me monnalry well <br /> tz * melon dile—nd ng well <br />