Remedial Investigation/recommended action-1995

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� Sailors World, Inc. Summit Project No. 922030 � October 5, 1995 Page 5 � 3.3 Field Screening and Analysis of Soil Samples � Soil headspace screening was performed at test probe locations P-9 through P-15. During test probe operations, continuous core samples were screened for indications of organic vapors using a PID and jar headspace methodology. PID readings were not detected above background levels � at P-9, P-10, P-11, P-13, and P-14. The PID readings were generally below background levels at P-15, with a reading of 1 ppm detected at 8 feet below grade. The highest PID reading was recorded at P-12 (27 ppm), located on the other side of Highway 15, approximately 3 feet below � the ground surface. Test probe logs containing soil descriptions and soil headspace screening results are included in Appendix III. � Chemical analysis of soil samples collected in June 1995 indicated that concentrations of petroleum h�drocarbons were relatively low or below method detection limits. Six soil samples were analyzed by an independent laboratory for benzene, toluene, ethylbenzene, total xylenes � (BTEX), and methyl tertiary butyl ether (MTBE). Additionally, selected soil samples were submitted for analysis of diesel range organics (DRO) and lead. An additional soil sample was � analyzed on site using the laboratory equipment within the Geoprobe�van. Three of the six soil samples had detectable benzene concentrations. However, these concentrations were at or near the method detection limits, with the highest benzene concentration being detected at P-9 (0.13 � ppm). Similarly, low or non-detectable concentrations of toluene, ethylbenzene, and xylenes were reported for the soil samples. Concentrations of MTBE were not detected at or above the method detection limits for the soil samples. Reported DRO concentrations were 42 ppm at P-11 � and 180 ppm at P-12. These two probes were completed on the west side of Highway 15. In contrast, P-15, which was completed near the former UST, did not contain detectable concentrations of DRO or gasoline range organics (GRO). As presented in Table 1 and the � attached laboratory report (Appendix N), results of the chemical analysis performed at P-11 and P-12 indicate that unidentified components with higher molecular weight than gasoline may be present in this area. Lead was detected at higher concentrations at P-11 (25 ppm) and P-12 (45 � ppm) than the reported concentration in the area of the tank basin, P-15 (2.5 ppm). The results of chemical analysis of soil samples are summarized in Tables 1 and 2. � 3.4 Water Sampling and Analytical Results During completion of the first round of Geoprobe� test probes in June 1994, groundwater � samples were collected at test probe locations for chemical analysis, with the exception of P-7 since water was not observed at this test probe location. A water sample was also collected at the � Sailors World water supply well. Chemical analysis was performed on site using the Geoprobe� laboratory for BTEX,MTBE, GRO, 1,3,5-trimethylbenzene (TMB), and 1,2,4-TMB. � A modified version of the State of Wisconsin GRO Method was used to quantify GRO concentrations in the field utilizing purge-and-trap sample concentration. Soil and groundwater samples were. concentrated with an OI-Analytical Model 4460A purge-and-trap sample _ � �