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j <br /> Ms Margaret Lagorio Project 880-040 IA <br /> August 29, 2002 <br /> Page 4 <br /> CONCLUSIONS <br /> Groundwater levels have decreased approximately 10 foot since the second quarter <br /> 2002 sampling event Generally, groundwater results showed a decrease or stable TPH- <br /> g, BTEX, and MtBE concentrations trend for the three onsite wells The TBA increase in <br /> 4 MW-2 and MW-3 reported in the second quarter 2002 was anomalously high and current <br /> groundwater concentrations have returned to historical levels <br /> RECOMMENDATIONS <br /> On May 22, 2002 a deep boring was installed adjacent to well MW-1 to the total depth <br /> of 54-feet bgs to define the vertical extent of MtBE in soil and groundwater at the site <br /> On May 23, 2002 two monitoring wells (MW-4 and MW-5) were installed at the <br /> locations shown on Figures 1 and 2 A dual phase extraction test was conducted from the <br /> morning of June 10, 2002 through the morning of June 15, 2002 by TRC Alton <br /> Geoscience, Inc The results of this investigation as well as conclusions and <br /> recommendations for the next phase of work will be included in the Additional <br /> Assessment and Interim Remediation Report <br /> If there are any questions regarding the contents of this report, please call <br /> Kathleen Waldo at (916) 565-4370, or Sue Kraemer at (916) 565-4180 <br /> Sincerely, <br /> SHAW ENVIRONMENTAL& INFRASTRUCTURE, INC <br /> Kathleen A Waldo Sue Kraemer, CEG 1666 <br /> Staff Engineer Senior Geologist <br /> Shaw Environmental&Infrastructure,IncSAC W 1sacDP120021PR]1Pl8188018800401A tab doc-021ms 3 <br /> (01070000) <br />