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CONCLUSION <br /> • Of the listed constituents with consistent positive results, the only ones that remain a concern are <br /> Benzene,TPHg,and 1,2-DCA The remainder are within 1ppb of the MCL's With the stoddard <br /> solvent tank and the leaded gasoline tank removed natural attenuation is expected to take place <br /> The trend lines confirm that natural attenuation is taking place From the results of MW-2S and 2D <br /> it is expected that natural attenuation has the ability to reach concentrations for 1,2-DCA of less <br />' than 1ppb. A typical Underground Storage Tank release will not travel more than 200' from the <br /> source The new data from CPT-1,CPT-2,MW-1 S,MW-1 D,MW-6S,and MW-6D has confirmed <br /> the horizontal and vertical limits of the plumes and indicate that this site is acting as expected by <br />' not traveling farther than 200' Due to the distance, position, and use of existing irrigation and <br /> municipal ground water wells,the public is not at risk of exposure to Benzene,TPHg or 1,2-DCA <br /> RECOMMENDATIONS <br /> Foothill Engineering recommends closing the site <br />' Please contact this office at(916) 729-5184 if any questions anse from this report <br /> Respectfully submitted, pROFESSrp,�9 <br /> rFoothill Engineering '�-Ro�����fi <br /> sv 1 C' <br /> �, yY <br /> Exp iS <br /> Michael Vlach, P E <br /> r � <br /> Attachments EXHIBIT "A" UG—H "H" <br /> cc Mrs. Helen Higgins, .lames Barton <br /> r <br /> r <br /> 6 <br />