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09 April 2009 <br />AGE -NC Project No. 03:1055 <br />Page 2 of 2 <br />Q <br />• Based upon data collected from the site, depicting a stable and, declining plume, AGE <br />believes the ground water data set will not be enhanced by continued quarterly ground water <br />sampling from wells MW -5 through MW -14 is no longer cost effective and will not provide <br />additional necessary information to the ongoing investigation. <br />• Constituents reported inMW- 11 depicts an up -gradient and off-site source of hydrocarbons, <br />(adsorbed and dissolved) which has not declined over time since the closure of the adjacent <br />site. Analytical data collected from well MW -11, located in the up -gradient and cross - <br />gradient hydrogeologic positions, suggest the dissolved TPH=g plume has originated from <br />an off-site source, the former Chevron Fueling Station: <br />• Differentiation of the dissolvedhydrocarbon-impactto well MW -8 is not practical due to the <br />up -gradient source of impacted ground water -within the City of Tracy Right -of -Way and <br />further on the property formally operated as a Chevron fueling station. <br />;Your cooperation in this matter would be greatly appreciated and is vital to the continued success <br />of this ground water cleanup effort. A copy of this. letter will be forwarded to Mr. James Barton of <br />the Central Valley Regional Water Quality Control Board (CVRWQCB). <br />If you have any questions or comments, please contact our office at (209) 467-1006. <br />Sincerely, <br />"Advanced GeoEnvironmental, Inc. <br />roF��S' M R ;G,�laGi --' <br />2Q' ��A 11T sr <br />William R. Little ��9 P��P m Ally L. Col avita <br />,Senior Project Geologist Project Scientist <br />California Professional Geologist No. 7473 <br />cc: Mr. Joe Panetta <br />Mr. James Barton; CVRWQCB <br />Advanced GeoEnvironmental, Inc. <br />9 <br />