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Manteca ouarterly Groundwater Monrtonng _ Page 5 <br /> TABLE 2_ Analytical Groundwater Data <br /> November 1991 and April 1992 <br /> � >�{'} <br /> t •} 'a'�`�S/R�I�(� i��Rt�(*� �j1�R ��r} Sim jr]SR�(�� }`�' RX <br /> } i <br /> MWI-MAN ATL7ZW1�1AN -MW3-MM 1'.M�'?.4� , t-� 1�a 7�ft'A> � 37�� <br /> Volatile Hydrocarbons ND ND ND ND 1,800 b ND <br /> Benzene ND 16 b ND ND 220 b ND <br /> Toluene ND ND ND ND ND ND <br /> Ethyl Benzene ND ND ND ND ND ND <br /> Xylenes ND 0 90 22b ND ND 120 ND <br /> Lead 19 ppb 350 ppb 1 24 b 26 b 57 ppb 27 ppb <br /> NOTES <br /> ND = Anatytes reported as ND were not present above Detection Limits <br /> ' Detection Limits Volatile Hydrocarbons 50 ppb <br /> Benzene 0 50 ppb <br /> Toluene 0 50 ppb <br /> 1 Ethyl Benzene 0 50 ppb <br /> Xylenes 0 50 ppb <br /> Lead 0.50 ppb <br /> ' April 1992 sampling events are provided in Appendix A, and copies of the Geologic Logs and <br /> Monitonng Well Construction Diagrams are provided in Appendix B The static water levels to <br /> each of the three monitoring wells rose significantly since November 1991, likely due to seasonal <br /> variation The exact amount of precipitation or infiltration is unknown, however, the elevated <br /> levels of volatile hydrocarbons, benzene and xylenes may be the result of seasonal fluctuations <br /> in the static water table <br /> j6.0 REGULATORY SITE VISITS <br /> No representative of any regulatory agency was present during groundwater sampling activities <br /> Ms Margaret Lagorio, Senior REHS with San Joaquin County REHS/EHD, was informed of the <br /> field schedule <br /> 1 7.0 SUMMARY OF FINDINGS <br /> The constituents of BTEX or Volatile Hydrocarbons were not detected in groundwater samples <br /> collected from monitoring wells MWI or MW3 Volatile Hydrocarbons were detected in <br /> monitoring well MW2 at 1,800 ppb, as well as Benzene (220 ppb), and Xylenes (120 ppb) Lead <br /> was detected to all three monitoring wells Lead concentrations included 26 ppb in monitoring <br /> wells MWI, 57 ppb in MW2, and 27 ppb in MW3 <br /> „so.22%Q t,irw 22 Steffen Robertson and Kirsten <br />