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QUARTERLY SUMMARY REPORT <br /> Third Quarter 2002 <br /> (July - September) <br /> CHARACTERIZATION/REMEDIAL STATUS: <br /> Impacted soil delineated? Lateral: yes <br /> Vertical: yes <br /> Impacted ground water delineated? no <br /> Current Phase of Project? Groundwater Monitoring and <br /> Sampling, Interim Remediation, and <br /> Additional Delineation <br /> Frequency of Sampling? Quarterly <br /> Current Remediation Techniques? Groundwater Purging <br /> Soil remediation in progress? no <br /> -anticipated start? <br /> -anticipated completion? January 1999 <br /> Groundwater Gradient (historical)? Southeast to southwest at an average <br /> gradient of 0.001 ftlft <br /> Dissolved/free product remediation in progress? Yes <br /> -anticipated start? February 1999 <br /> -anticipated completion? unknown <br /> Amount of impacted groundwater recovered this quarter? 58,500 _(gal) <br /> Amount of impacted groundwater recovered historically? 716,580 <br /> (gal) <br /> CONCLUSIONS: <br /> The vertical and lateral extent of soil impact is defined. Additional subsurface investigation in the vicinity of well <br /> -:,.. MW-10 has been completed but did not define the downgradient extent of impacted groundwater. The impacted <br /> k`rr• - groundwater beneath the site is currently being remediated by weekly �oundwater purging. The purged <br /> groundwater is being transported to the Tosco Refinery in Rodeo, California for disposal. <br /> RECOMMENDATIONS: <br /> GR recommends the continuation of the weekly groundwater purging program. GR also recommends that the new <br /> offsite monitoring wells be added to the quarterly monitoring and sampling program to confirm the detected <br /> concentrations of hydrocarbons in the new wells. Additional groundwater monitoring wells are scheduled to be <br /> installed during the fourth quarter of 2002 to delineate the extent of the downgradient dissolved hydrocarbon plume. <br /> An onsite interim remedial ozone microsparge system will be installed at the site during the fourth quarter of 2002. <br /> CONSULTANT: Gettler - Ryan Inc. <br /> 140193.01 <br /> 2 <br />