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ClealvgredTeemmcs Inc. Page 3 <br /> Groundwater Monitoring Report <br /> Project No 2812 <br /> December 18, 1996 <br /> I A chain of custody document, listing all samples collected and their intended analyses, <br /> accompanied the samples from field to the laboratory, thereby providing a means to track <br /> their movement and insure their integrity <br /> 1.3 Laboratory Analyses <br /> ses <br /> The groundwater samples collected on September 11, 1996 were delivered to Sherwood Lab <br /> (Department of Health Services Certification No 1400), of Hilmar, California, for analysis <br /> The samples were analyzed using the following methods <br /> 0 method 602 - benzene, toluene, ethylbenzene, total xylene (BTEX), and MTBE, <br /> ® method m8015/LUFT-total volatile hydrocarbons as gasoline (TPH-G) <br /> The detection limits for the above analyses are listed in Table 2 of Appendix A and the lab <br /> data is presented in Appendix B <br /> 1.4 Yree Product Removal <br /> Mr Terarushi removed the floating gasoline from MW-2 an a daily basis from September 12, <br /> 1996 through October 31, 1996 Refer to the field log in Appendix C A total of 60 plus <br /> gallons of gasoline/water mix have been removed by hand bailing methods <br /> 2.0 IFIINII GS AND ➢DESCUSSION <br /> Floating product was observed in MW-2 (approximately 1 foot) during this sampling event. <br /> The laboratory analytical data from this monitoring event shows that gasoline range <br /> petroleum hydrocarbons continue to be detected in wells MW-1 & 2 The sample from well <br /> MW-3 did not contain petroleum hydrocarbons <br /> The latest round of sampling shows a shift in the groundwater plume compared to May 1995 <br /> sampling event (refer to summary Table 2 in Appendix A) It is not clear if the shift in the <br /> plume is related to the changes in the groundwater elevation (about 3 feet from March 1996 <br /> to July 1996) or the slight change in direction of groundwater flow Additional wells and <br /> groundwater monatoring are sure to bring us a better understanding <br /> 3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The following conclusions have been drawn regarding the status of the groundwater at this <br /> sight and recommendations for future work <br />