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TEL No . Jun 17 ,96 9 :09 No .011 P .03 <br /> Page 2 June 1996 <br /> PREVIOUS INVESTIGATIONS <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 comer 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 I.VMD#I,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 /> gruundwatcrcontamination 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#l 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 I 1 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 LVMD01,which, The Phase It results idemtfied three principal groundwater- <br /> in tum,permitted the dry cleaning fluids to enter the well. hearing zones beneath Lincoln Center: the A, B,and C <br /> zones. Groundwater samples collected from monitoring <br /> In June 1987,the RWQCB required that LPI,perform wells installed during the Phasc 11 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 11 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 /> YCAp�+ oWl <br /> li Y <br /> J fYCW,Wr. Y 12 •O MN <br /> •�.M WrY'1 • <br /> CM.... EYTIIM,q <br /> OY Coin •�� ,nra <br /> —" ` _" .rn. ,���`"R a Ir..i�n•i arx..�..�arvol�l y.,,,.,q <br /> �y /oYY,a•1 e••.. � a.vr.,aY,....rwn+ro le.+... <br /> �� • � �� 4..r...i.•,aem alw <br /> r.r 1 � b w.m.n..•..n..l <br /> . ,. _ o •-IOM^i+ronn.... <br /> U o.w..e..wr..Y <br />