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Mr Edward C Ralston <br /> March 13, 2001 <br /> Page 5 <br /> monitoring wells contained the following TPH-g ranging from 1.,700 to 72,000 ppb, <br /> benzene ranging from 9 3 to 250 ppb, and MTBE (EPA Method 8260) ranging from <br /> 27 to 750 ppb Highest detected concentrations were In off-site well MW-6 located <br /> approximately 70 feet downgradlcnt of the USTs The distribution of groundwater <br /> -impacts suggests that the dissolved petroleum hydrocarbon mass is migrating off- <br /> site <br /> RECOMENDATIONS <br /> IT recommends conducting the second quarter groundwater monitoring event to verify the <br /> results of the initial sampling of the five new monitoring wells After evaluating the data, IT <br /> recommends preparing a workplan for further groundwater investigation that includes a <br /> groundwater grab sampling program to further delineate the shallow groundwater impacts <br /> The grab sample data will be evaluated prior to proposing monitoring well locations The <br /> tentative schedule for further assessment is 1) workplan submittal In the beginning of the <br /> thud quarter 2001, 2) obtaining access agreements and encroachment permits during the <br /> third quarter 2001, and 3) implementation of the assessment In the late third quarter or early <br /> fourth quarter 2001 <br /> If there are any questions regarding the contents of this report, please call us at (530) 676- <br /> 6884 <br /> Sincerely, <br /> 1T Corporation <br /> CAPF'S �4 <br /> NO.6561 � <br /> Mark Capps Exp11.3a <br /> Project Geolog `�- <br /> RG 6561 <br /> OFCA <br /> 911005 1C/12.05wp_Q301 doc TT Corporation <br />