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• <br /> As mentioned in previous reports, a major soil & groundwater <br /> Plume exists to the north which is centered on the Darpetro site <br /> to the northwest of the Morita property. Monitoring well data <br /> from that project, taken on January 19, 1995 was reviewed by our <br /> staff and indicated that some of the contamination measured in <br /> the groundwater from the Morita site is from that source . Refer <br /> to the WJH quarterly groundwater monitoring report dated May 26, <br /> 1995 for more details . We do not have any information on current <br /> activities at that site, but there was no visible evidence of <br /> remediation equipment on the property during a recent visit to <br /> the area <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-1 has consistently shown the lowest <br /> levels of benzene, (ND except for the 2/94 sampling. ) Benzene <br /> levels have been the highest in MW-2 since the 10/93 sampling <br /> TPH as gasoline has shown the highest levels in MW-2 & MW-3 , but <br /> there does not appear to be any readily identifiable pattern to <br /> explain the variations . Levels of toluene, ethylbenzene, & <br /> • xylene detected in the three wells since monitoring began vary <br /> widely, again, no definite pattern is apparent <br /> The water table had dropped slightly over 1 foot since the July, <br /> 1995 sampling, (to an average depth of 46 071 bgl, the second <br /> highest level since monitoring began <br /> The reason for the anomalous change in direction of the potentio- <br /> metric surface measured during the July, 1995, (from NE to NW, ) <br /> is not known. There is no apparent correlation between measured <br /> levels of BTEX & TPH-G and gradient direction Prior data <br /> suggested that there may have been an extraction source to the <br /> west or north within the zone of influence of these wells . <br /> However, results from the latest sampling are inconclusive <br /> We have not been informed of recent investigative or remediation <br /> activities associated with the Darpetro site, but the latest <br /> sampling event on the Morita property does not show any mayor <br /> change in conditions We would appreciate any information that <br /> is available concerning offsite activities in the area <br /> Wm unter & Associates � p <br /> cc Frank Morita <br /> Beth Thayer, RWQCB <br /> 6'd�Ll1ANl 1.� <br /> �xPir�s <br /> NO 860�� � <br /> �l��or CA��F� <br />