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i <br /> showed a slight increase from 740 to 779 ug/L. <br /> As we have mentioned in previous reports, a ma3or soil & <br /> groundwater plume exists to the north which appears to be <br /> centered on the Darpetro site to the northwest of the Morita <br /> property. Monitoring well data from that pro3ect, taken on <br /> January 19, 1995 was reviewed by our staff and indicated that <br /> some of the contamination measured in the groundwater beneath the <br /> Morita site is from that source . Refer to the WJH quarterly <br /> groundwater monitoring report dated May 26, 1995 for more details <br /> of that data We have not been provided any information con- <br /> cerning current activities at that site, but but a recent visit <br /> to the area did not show any evidence that a remediation project <br /> has begun. <br /> A summary of all of the laboratory analyzes of water samples <br /> taken since monitoring began in October, 1992 , is included as <br /> TABLE I . It reveals that MW--2 has generally shown the highest <br /> .levels of BTEX & TPHg, with MW-1 the lowest . MW-3 has measured <br /> varying low amounts of BTEX, with higher levels of TPHg. Based <br /> upon maps drawn on lines of equal concentrations of BTEX & TPHg, <br /> groundwater contamination increases to the east./northeast, which <br /> is the direction of groundwater flow. MTBE was not detected in <br /> any of the water samples taken July 1, 1996; it had not been <br /> analyzed in previous sampling events . <br /> The water table has risen an average of 3 .34 ' since the February <br /> 1996 sampling, (to an average depth of 41 .04 ' bgl , ) the highest <br /> level since monitoring began <br /> CONCLUS IONS : <br /> Based upon all of the data collected since monitoring began in <br /> October, 1992, the following conclusions appear valid: <br /> 1. Groundwater flow is relatively stable in a east/northeast <br /> direction. This correlates well with regional data. <br /> 2 . Levels of BTEX & TPHg in the water have varied widely since <br /> monitoring began, but do not show any apparent reduction in <br /> concentrations with time . <br /> Groundwater monitoring will continue on a sena-annually schedule, <br /> as approved by the County EHD; the next sampling event is due in <br /> December, 1996 . <br /> We would like periodic updates from the County HHD staff of work <br /> being performed at the Darpetro or neighboring sites . We do not <br /> 2 <br />