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Mr John Benedict Project No 880-039 IA <br /> July 25, 2002 <br /> Page 5 <br /> CONCLUSIONS <br /> Analytical results of collected groundwater samples from the site were generally consistent with <br /> previous sampling events Groundwater elevation decreased between 0 03 and 0 15 feet from the <br /> previous sampling event (February 22, 2002) The observed groundwater gradient during the <br /> second quarter 2002 was 0 006 fl/ft to the north-northwest Petroleum hydrocarbon concentrations <br /> have increased since the first quarter 2002 but are still within historical levels Graphs showing <br /> TPHG, benzene, MTBE concentrations, and groundwater elevations versus time in onsite wells <br /> are presented in Appendix E <br /> Approximately 26 pounds of TPH-g and 0 04 pounds of benzene were removed during the second <br /> quarter 2002 The system performed in compliance with permit requirements Pulsed operation of <br /> the soil vapor extraction system was begun in the second quarter 2002 and will continue through the <br /> third quarter 2002 <br /> Shaw E & I will continue to perform quarterly groundwater sampling The next sampling event <br /> is tentatively scheduled for September 2002 <br /> Please call Kathleen Waldo at (916) 565-4370, if you have questions regarding this report or any <br /> aspect of the project <br /> Sincerely, <br /> SHAW ENVIRONMENTAL& INFRASTRUCTURE, INC <br /> Martin Mi G, RGP Kathleen A Waldo <br /> Project Geologist Y Staff Engineer <br /> MARTIN J } <br /> MEI. <br /> s, <br /> NO 6088 <br /> 11SACRFP 1ICO MMON1sacDP120021PRJIPJ8\880\8800391A tae(10L <br />