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ADDITIONAL GROUND WATER MONITORING WELL INSTALLATION AND UART#=RLY GROUND WATER MONITORING REPORT FIRST UARTER 1942 Exxon Stahon R/S 7-3708 2705 Country Club Boulevard Stockton, California Delta Project No 40-91-838 Page 3 ' 2.2 Soil Sample Collection and Analytical Results Soil samples were collected at 5-foot vertical intervals during the course of drilling Soil from each interval was collected in three,2 by 6-inch brass tubes Upon retrieval, soil from one of the brass tubes was extracted and placed in a glass jar and brought to ambient air temperature The soil sample headspace was field-analyzed for the presence of organic vapors with an organic vapor meter (OVM) OVM screening results are included on the soil boring logs (Appendix B) OVM readings are recorded ' in parts per million (ppm) as only a relative measurement Field screening results indicate that organic vapors were not present in soil samples collected from the borings of monitoring wells MW-4 through ' MW-6 ' At each 5-foot interval, one of the brass tubes containing a sample was sealed, capped, and stored in accordance to EPA procedures for possible chemical analysis Soil samples were submitted for laboratory analysis based on the field-screening results and the location of the sample in relation to the ground water table Soil samples were submitted for analysis of BTEX and TPH as gasoline Soil sample analytical ' results for the February 10 and 11, 1992, drilling event are presented in Table I ' TABLE 1 Analytical Results of Soil Samples Collected ' Concentrations in Parts per Million (ppm) Sample Date Depth Ethyl- Location Collected feet Benzene Toluene benzene Xylenes TPH MW4-10 02/10/92 10 <0 005 <0 005 <0 005 <0 005 < 1 0 ' MW5-10 02/10/92 10 <0 005 <0 005 <0 005 <0.005 < 1 0 MW6-10 02/11/92 10 <0 005 <0 005 <0 005 <0 005 < 1.0 a Total Petroleum Hydrocarbons as gasoline RPT112 JDM