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' 1 24 August 2005 • AGE-NC Project No. 97-0301 ' Page 6 of 6 t5.0. RECOMMENDATIONS Based upon data collected during the 2nd Quarter 2005, AGE recommends: • Continued groundwater monitoring utilizing wells MW-1 through MW-12;the third quarter 2005 ground water monitoring event is scheduled for September 2005. ' • If applicable,conduct future ground water monitoring events concurrently with the Cal-Tank Lines site (3105 South El Dorado Street). •' Continued quarterly depth-to-water measurements in all monitoring wells at the site, but 16'tk p r reduced ground water sampling frequency at wells MW-2, MW-3 and MW-6 from a quarterly to an annual program; AGE believes that continued quarterly ground water J sampling from these wells at this stage of the investigation is not cost effective and will ' provide minimal information to supplement the ongoing investigation. Annual sampling a 04 ) events should be adequate to monitor ground water impact at these wells and should be re- rp ' evaluated on an annual basis. • Elimination of TPH-d, TPH-k and TPH-mo from the site's ground water monitoring l��00's program. (k011r 6� Installation of additional monitoring wells southeast-beyond well MW-9A and northeast • t beyond well MW-l0A to define the First Water Zone dissolved 1,2-DCA plume. � G 4Ars( �� - ';SIA 6.0. LIMITATIONS o� 3Yn Y � Our professional services were performed using that degree of care and skill ordinarily exercised by ' environmental consultants practicing in this or similar localities. The findings were based upon analytical results provided by an independent laboratory.Evaluation of the hydrogeologic conditions at the site for the purpose of this investigation was made from review of previous consultants reports ' and a limited number of available data points(ground water data/samples)and subsurface conditions may vary away from these data points. No other warranty, expressed or implied, is made as to the professional interpretations, opinions, and recommendations contained in.this report. � I 1 . � ' Advanced GeoEnvironmcntal,Inc.