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DEPTH TO GROUNDWATER: <br /> Based upon San Joaquin County Flood Control District maps, ground <br /> water was at approximately 40 ' bgl when measured in the spring of <br /> 1986. The spring 1993 map issued by the same agency indicates <br /> that groundwater is about 75' bgl; this agrees quite closely with <br /> the water level measured during the most recent work in January <br /> of this year. <br /> BRIEF CHRONOLOGY OF EVENTS SINCE INITIATION OF PROJECT: <br /> JJuly 12. 1989 - 1 ,000 gal UST removed by Jim Thorpe Oil, Inc , <br /> (JTO. ) A strong gasoline odor and discolored soil was noted at <br /> the west end of the excavation, in the vicinity of the pump <br /> island. Spoil returned to hole & covered with plastic. <br /> January 19 thr 22. 1990 - Site was re-entered and additional <br /> Spoil was removed <br /> October 4 & 5 1990 - Five (5) auger holes were placed in an <br /> attempt to further define the plume. Four were located on Normac <br /> • property, and one was located to the west of the tank site on <br /> property owned by Hammertown. Partners <br /> ril 8 & O 1992 - Because the previous work had not determined <br /> the vertical & lateral extent of the contamination, six (6) addi- <br /> tional auger holes were placed on the properties. The limits <br /> were defined except in a southerly direction on the Hammertown <br /> property. <br /> August 13, 1992 - Three additional soil borings were located on <br /> Hammertown Partners property, which revealed that Toluene was <br /> detected in all three holes at 40 ' bgl, the approxmate water <br /> table level in the Spring of 1986. <br /> Januqry L4 & 17, X994 - Two auger holes, identified as TB--1 . <br /> located on Normac property, and TB-2. located on the Hammertown <br /> site, were cored and sampled at 5 foot intervals from 21 ' to <br /> 71 'bgl. At that depth, a hydropunch tool was driven to approxi- <br /> mately 75' in order to obtain a clean uncontaminated groundwater <br /> sample. Laboratory results showed that all soil and water <br /> samples from both auger holes were below detection limits for <br /> BTEX & TPA--G. Refer to TABLES I thru VII for summaries of all <br /> laboratory results since initiation of the project_ <br /> A Site Assessment Report and Results of Soil/water investigation, <br /> dated Feb_ 21, 1994 , was prepared by WJH and submitted to the <br /> 2 <br />