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18 October 2013 <br />AGE Project No. 99-0559 <br />Page 5 of 5 <br />The overall removal of contamination since the initiation of the groundwater <br />extraction/treatment system in May 2003 is a total of 13,625.3 lbs of TPH-g, 783.3 <br />lbs of benzene and 1,321.4 lbs of MTBE. Remediation equipment additions have <br />significantly reduced the wastewater stream overall and discharge of petroleum to <br />GAO media appears to be stable. <br />4.0. RECOMMENDATIONS <br />Based on the findings and conclusions in this report, AGE recommends the following: <br />Continued operation of the groundwater extraction system in order to minimize the <br />lateral migration of petroleum hydrocarbon-impacted groundwater near the western <br />and eastern edges of the site. <br />State Water Resource Control Board has designated this site as a remediation and <br />allocated a sufficient amount towards reimbursable costs (approximately $70,000) <br />and additional costs have been requested to be dedicated to the remediation and <br />monitoring of the site, if required. Therefore, the site groundwater extraction and <br />discharge will continue until funds are expired or reallocated to prevent a cessation <br />of remedial activities. <br />5.0. LIMITATIONS <br />Our professional services were performed using that degree of care and skill ordinarily <br />exercised by environmental consultants practicing in this or similar localities. The findings <br />were based upon analytical results provided by an independent laboratory. Evaluations of <br />the hydrogeologic conditions at the site for the purpose of this investigation are made from <br />a limited number of available data points (groundwater samples), and subsurface <br />conditions may vary away from these data points. No other warranty, expressed or implied, <br />is made as to the professional interpretations, opinions and recommendations contained <br />in this report. <br />Advanced GeoEnvironmental, Inc.