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Ms Victoria McCartney <br />' 07/28/06 <br /> Page 4 of 4 <br /> Summary and Conclusions <br /> • During this quarter, groundwater flowed to the east at a horizontal hydraulic gradient of 0 005 Z <br />' ft/ft <br /> • Concentrations of petroleum hydrocarbon constituents for the second quarter of 2006 are <br />' generally consistent with the results of the first quarter of 2006 ` <br /> • Based on previous data evaluations, detections of TPH-D and TPH-MO at the site are likely the <br /> result of unknown chemicals eluting in the TPH-D and TPH-MO range <br /> • Concentrations of 1,2-DCA, MTBE and benzene exceeded the California Primary MCLs in the <br />' groundwater samples collected from monitoring wells MW-2 and/or MW-3 <br /> Recommendation <br /> I • A groundwater monitoring and sampling event will be conducted during the third quarter of 2006 i <br />' If you have any questions or comments regarding the contents of this report, please contact Davi of <br /> BBL at (315) 671-9197 or by e-mail at dlay(a,bbl-mc corn or David Evans of BBL at <br /> extension 226 or by e-mail at devans bbl-mc com �L``� �p �� s111e'� <br /> C� v' <br /> -� <br /> Sincerely, <br /> z C 65705 <br /> BLASLAND, BOUCK& LEE, INC * FXP <br /> "4' civti� ae'c <br /> David W Lay, C P G Michael P Fleischner, P E <br /> Senior Geologist Principal Engineer <br /> DWL/lw <br /> Attachments <br /> Attachment l Groundwater Monitoring& Samplmg Report, Gettler-Ryan Inc ,June 14, 2006 <br /> Attachment 2 Groundwater Flow Direction Rose Diagram <br /> cc Ms Stephanie Furgal, Chevron Environmental Management Company <br /> I Mr Jim Barton,Regional Water Quality Control Board <br /> Ms Pearl Myer <br /> I <br /> 022603054 doc <br /> I BLASLAND, BOUCK& LEE, INC <br /> an ARCADES company <br />