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SUMMARY AND COMMENTS <br /> I .a On January 16 1996 the average depth to the water table underlying the project area was 14.05 <br /> feet, rising 1.58 feet since October 18, 1995. Using the three-point method, the calculated local <br /> direction of ground-water flow on January 16 was approximately N77°E, a shift of 16° to the <br /> north since October 18 when the calculated flow direction was S87°E. Overall, the flow <br /> direction has remained easterly. The gradient has remained essentially unchanged during the <br /> ; .I <br /> subject three-month period. <br /> Ground-water samples collected from the five wells were received at Sherwood Labs on January <br /> 16, 1996. The analytical results revealed continuing nondetectable concentrations of TPH-g and <br /> .:1 BTEX in samples collected from wells MW-4, MW-5, and MW-7. Also, no detectable gasoline <br /> ' analytes were detected in the sample collected from 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, though favorably so, to a lesser degree. TPH-g and <br /> benzene analytes 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 have declined approximately 33% between October 18, 1995 and January 16, 1996. <br /> Concentrations of toluene, ethylbenzene, and total xylenes have also declined dramatically, <br /> falling further below their respective MCLs. <br /> The next ground-water monitoring activity is scheduled for mid-April, 1996. <br /> CERTIFICATION <br /> Should any questions arise regarding the information contained in this report, or if we may be <br /> of further service, please contact our Merced office at (209) 725-2085. W.W. Irwin, Inc, is not <br /> =� responsible for undisclosed or hidden, site-specific information or conditions. <br /> Respectfully Submitted, <br /> W.W. Irwin, Inc. <br /> �keD GAO` �, pL W� <br /> OGS <br /> DAYNE L FRARY Nco ' <br /> No.02980 <br /> =� Dayne L. Frary o ,�,� �, 3n 9b n <br /> Merced Branch Manager (P No.4456 <br /> Registered Geologist No. 4456 �Aj, !0.3!•47 <br /> Registered Environmental Assessor No. 02980 �O CALo�O -�j�OFCAL�FOQ <br /> -- <br /> W.W. Irwin, Inc. <br /> Project No. 33016.06 <br /> February 1996 12 <br /> I <br /> '' s <br />