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of BTEX detected Benzene & ethylbenzene were highest in MW-2 in the last three measurements, but Toluene was highest only in the October, 1992 sample Xylene levels have been higher in MW #3 in three samples , and higher in 02 in two The water table has risen an average of 4 67 ' since the October, 1992 meaurement, and about 1 ' since February, 1994 In fact, the average depth measured in May of this year is the highest since quarterly monitoring began. The rise in the water table could be affecting the varied levels of contamination measured to date, and may account for the fact that there does not appear to be a direct correlation with levels measured, locations , and time In summary, the data recorded to date supports the information obtained during the Feb 7, 1994 meeting held at the California Regional Water Quality Control Board offices in Sacramento That meeting was held to discuss the relationship between the site at 814 E Charter Way, (Morita Bros , ) and 749 E Charter Way, (Darpetro, Inc ) Attendees included staff members of the Regional Board & San Joaquin County EHD, and owners & consultants of the two sites Data presented at that meeting revealed that an extensive area of contaminated soil & groundwater exists in the . immediate area caused by leaking UST' s at the Darpetro site It is suspected that the contamination detected beneath the Morita Bros property is coming primarily from that undefined plume At that meeting, the San Joaquin County EHD staff stated that the soil beneath the Morita property had been successfully remediated and did not require further work Quarterly groundwater monitor- ing was to continue until additional work is performed to delin- eate the vertical & horizontal extent of the plume originating at 749 E Charter Way Sin e e y, Wm unter & Associates c rank Morita CVRWQCB, Beth Thayer � DGEQ�O .� fiva.86(► 2