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1444 TILLIE LEWIS <br /> STOCKTON CA <br /> CHRONOLOGY <br /> TANK #1 4000 GALLON XYLENE REMOVED 06-29-90 <br /> 06-29-90 One 4000 gallon xylene tank removed this date under permit and <br /> inspection of PHS-EHD. The inspector noted the steel tank to be in <br /> poor condition with corrosion and pitting on the bottom. Two soil <br /> samples were obtained from beneath the tank at approx. 12' bgs in <br /> loamiday soil. The soil was discolored and had strong petroleum odors. <br /> 07-18-90 PHS-EHD receives soil sample results. The results are shown below. <br /> Initial Laboratory :analysis - Soil <br /> Laidlaw Corporation <br /> Stockton, CA <br /> (in PPM) <br /> QRTE ,, ? S:aMPLE liI 8< T X17: <br /> TPHC <br /> 06/29/90 LS-TP 1-12'N ( NO I 10 740 5,220 8,000 <br /> LS-TP 1-12'S I NO 42 I 4,700 I 27,100 I 47,000 <br /> METHOD DETECTION LIMIT I 10 I 10 I 10 ( 10 I 2.000 <br /> 07-24-90 PHS-EHD files prop 65 and UAR this date. <br /> 03-0491 PHS-EHD receives workplan to over-excavate the former tank pit area. <br /> 03-11-91 PHS-EHD places site into the LOP this date. <br /> 03-19-91 Former tank pit over-excavated this date. Final dimensions are <br /> 40'x35'x14'. Approx. 750 cubic yards of soil removed from the pit. Six <br /> sidewall and 4 bottom samples were. collected from the finished <br /> excavation. <br /> 03-27-91 Three monitoring g wells installed this date. <br /> 06-10-91 PHS-EHD receives verbal groundwater results that indicate groundwater <br /> has been impacted. PHS-EHD updates MFR and prop 65 notification <br /> this date. <br />