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02 June 1997 <br /> AGE-NC Project No 95-0105 <br /> ' Page 5 of 11 <br /> ' 2a8 3 LABORATORY RESULTS OF GRAB GROUND WATER SAMPLES <br /> t <br /> TPH-g was detected in grab ground water samples collected from probe borings P5 and P6 at <br /> ' concentrations of 4,500 ppb and 740,000 ppb, respectively TPH-d was detected in grab ground <br /> water samples from borings P3,P4 and P5 at concentrations as high as 1,400 ppb(P4) Samples from <br /> P1 and P6 were not analyzed for TPH-d because only an inadequate volume of water could be <br /> collected from these probe borings Chromatography of the TPH-g analysis of P6 indicated the <br /> presence of compounds similar to TPH-d, however, confirmation was not possible <br /> ' Benzene was detected in the grab water sample from P6 at a concentration of 1,700 ppb, toluene, <br /> ethylbenzene and xylene were detected in samples collected from borings P5 and P6 at <br /> concentrations as high as 83,000 ppb(xylene,P6) Petroleum hydrocarbons were not detected in the <br /> sample collected from boring PI Analytical results of grab groundwater samples are summarized <br /> on Table 2 <br /> ' Analytical results of the soil and grab ground water samples collected during the subsurface <br /> investigation in January 1996 were included in the Qua?terly Report-January 1996,dated 15 March <br /> 1996, prepared by AGE <br /> 2 9 ADDITIONAL MONITORING WELL INSTALLATION AND SAMPLING <br /> On 10 May 1996, three soil borings were advanced at the site and completed as ground water <br /> monitoring wells Well MW-4 was established to determine the lateral extent of the hydrocarbon- <br /> impacted ground water at the northwest corner of the site in the immediate vicinity of probe boring <br /> P6, while MW-5 was established on the northern edge of the property, and MW-6 was installed in <br /> the sidewalk in the City of Tracy right-of--way north of Grant Line The well locations are shown on <br /> Figure 2 <br /> ' Petroleum hydrocarbons were detected in soil samples analyzed from the boring B5, advanced for <br /> the installation of MW-4 The samples were collected from depths of eight and ten feet bsg TPH-g <br /> was detected at concentrations as high as 32 ppm BTE&X compounds were also detected at <br /> concentrations as high as 2 4 ppm Analytical results of soil samples are summarized on Table 1 <br /> ' Analytical results of the soil samples collected during the monitoring well installation in May 1996 <br /> were included in the Quarterly Report-August 1995, date 30 October 1996 and prepared by AGE <br /> x <br />