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SUND4ARY AND COACUENTS <br /> :a On March 18, 1996, the average depth to the water table underlying the project area was 13.18 <br /> i feet; the piezometric surface has risen 0.88-foot since January 16, 1996. Using the three-point <br /> method, the calculated local direction of ground-water flow on March 18 was approximately <br /> S88°E, a shift of 15° to the east (arid slightly south) since January 16 when the calculated flow <br /> direction was N77°E. Overall, the flow direction has remained easterly. The gradient has <br /> flattened slightly between January 16 and March 18, 1996. <br /> i <br /> Ground-water samples collected from the five wells were received at Sherwood Labs on March <br /> 18, 1996. The analytical results revealed continuing nondetectable TPH-g and BTEX in samples <br /> collected from wells MW-4, MW-5, MW-7, and MW-8. <br /> The results of the analyses of the sample collected from MW-6 indicate that the ground water <br /> underlying that vicinity remains impacted. TPH-g and benzene analytes have increased since <br /> January 16 and still impact the ground water at concentrations exceeding the Maximum <br /> Contaminant Levels (MCLs) set by the California Department of Health Services. TPH-g and <br /> benzene had declined approximately 33% between October 18, 1995 and January 16, 1996. <br /> Concentrations of toluene, ethylbenzene, and total xylenes increased slightly between January <br /> 16 and March 18 but remained well below their respective MCLs. MTBE was not detected by <br /> Associated Laboratories' chemists in a portion of the sample collected from MW-6. <br /> This Project Status Report marks the completion of one year of monitoring activities contracted <br /> r _ with W.W. Irwin, Inc. in the spring of 1995. In a commenting letter dated March 27, 1996, the <br /> SJCPHS-EHD has recommended quarterly soundings of all five wells and samplings of MW-6, <br /> <; MW-7, and MW-8 for petroleum hydrocarbons. <br /> The ground-water monitoring activity for the third quarter should be scheduled for July, 1996. <br /> i <br /> ' 1 <br /> I <br /> 1 <br /> 1 <br /> V <br /> W.W. Irvin, Inc. <br /> i Project No. 33016.06 <br /> -= April 1996 13 <br /> J <br />