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t <br /> CHRONOLOGY <br /> CATELLUS DEVELOPMENT CORPORATION <br /> 1325(SITE 2)&1515(SITE 1) W. WEBER AVE. STOCKTON <br /> 1 L.O.P. SITE CODE: 1284 ! <br /> ' <br /> A.P.N. 145-190-16-1 <br /> is <br /> 11/16/88 One 2,000 gal. Gasoline UST(#1)reruoved from Site#1 area on west side of property. <br /> Address of 1515 Weber for UST#1. ! <br /> t 11/23/88 _ UAR completed and filed for release from UST#1 <br /> I' <br /> a <br /> 05/23/89 Report containing soil gas survey results completed by Kleinfelder for Site#1. <br /> 07/26/89 Site placed in LOP for groundwater assessment and remediation. <br /> 03/01/90 Soil borings 1-3 completed by Kleinfelder at Site#J. 3 MWs installed at Site#1: <br /> groundwater was impacted with gasoline. I <br /> 04/12/91 ERM completed 2 additional MWs at Site#1. A total of 5 MWs(1-5)were installed at <br /> Site#1. <br /> F <br /> 08/27/91 One 500 gal. Gasoline/Diesel UST(#3)and one 2000 gal.,'IUST removed;2000 gal. UST <br /> ND. UST#3 at Site#2 located on center of property. Address of 1325 Weber for UST <br /> t #3. f <br /> 10/21/91 Second UAR completed and filed for Site#2 (UST#3). <br /> E <br /> 03/27/92 4 MWs were installed at Site#2 by ERM: groundeater was impacted with gasoline <br /> contamination. a <br /> 04/08/93 One additional MW and 4 soil borings completed at Site#2. A total of 5 MWs(IA-5A) <br /> installed at Site#2. ! <br /> i 05/14/93 PAR prepared by ERM submitted to EHD. <br /> 10/05-19/93 Soil excavation was conducted at Site#land#2. Soil confirmation samples were <br /> 1, collected and analyzed. The excavated soil was aerated/treated on site. <br /> �I I <br /> 12/--/93 Groundwater extraction was conducted at Site 41 &Site#2. <br /> i} ! <br /> 12/29/93 Report including post aeration confirmation sampling prepared by ERM. <br /> 09/09/94 2 additional soil borings completed at Site#1 and 1 soil borings completed at Site#2. <br /> 09/28/94 1 soil boring completed at site 1. 3 soil borings completed at site 2. <br /> Ia 07/13/95 Received ERM Report of soil boring work performed in Sept. 1994. <br /> I <br /> 10/10-14/96 ORC socks placed in some MWs at Sites 1 and Site 2. <br /> I� I <br /> 07/22/99 Last round of groundwater sampling performed at Site#1 &#2. MW-5 at Site#1 had <br /> concentration of 0.14 ppm Gas, 0.00056 ppm, 1,2'DCA, 0.013 ppm Benzene,and <br /> 0.0011 ppm Xylene. MW-lA at Site#2 had concentrations of: 2.6 ppm Gas,0.86 ppm <br /> TEPH Unknown Hydrocarbon,0.024 ppm 1,2-DCA,0.26:ppm Benzene,0.01 ppm <br /> Toluene,0.06 ppm Ethyl-Benzene, and 0.068 ppm''xylene" MTBE was<0.020 ppm. <br /> i1 <br /> i <br />