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Ms Margaret Lagono Project 880-040 1A <br /> August 24, 2001 <br /> 16 Page 3 <br /> sampling event Oxygenate concentrations have decreased in MW-2 and MW-3 Oxygenate <br /> concentrations have increased slightly since the previous sampling event in MW-1 <br /> RECOMMENDATIONS <br /> On behalf of Parkinson's Hammer I-5 Arco, IT recommends continuing groundwater monitoring <br /> for one more event to assess hydraulic gradient and water quality <br /> If there are any questions regarding the contents of this report,please call us at (916) 928-3300 <br /> Sincerely, <br /> IT Corporation <br /> Kathleen A Waldo <br /> Staff Engineer <br /> Ed Simonis, R G p <br /> Senior Geologist 00.4422 y <br /> � L1FO <br /> Attachments Table 1 —Groun er Elevation and Analytical Data <br /> Figure I — Groundwater Elevation Contour Map, Third Quarter 2001 <br /> Figure 2 —TPH-g/Benzene/MtBE Concentration Map, Third <br /> Quarter 2001 <br /> Attachment A—Field And Laboratory Procedures <br /> Attachment B—Certified Analytical Reports, Chain-of-Custody <br /> Documentation, and Field Data Sheets <br /> cc Mr Jim Parkinson, 3250 West Hammer Lane, Stockton, California <br /> N 1sacDp1200I\PRJ\PJ818800401A laa doe <br />