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' 04 March 2002 <br /> AGE-NC Project No 95-0111 <br /> Page 4 of <br /> laboratory reporting limits in the ground water samples, however the laboratory detection <br />' limit was 1,000 µg/1 <br /> MTBE was detected in the sample collected from MW-1 at a concentration of 79 µg/1 No <br />' other fuel additives, including 1,2-DCA and EDB were detected at or above laboratory <br /> reporting limits in the ground water samples analyzed A map illustrating the approximate <br /> extent of TPH-g- and MTBE-impacted ground water is depicted on Figure 4 <br /> • No analytes were detected at or above laboratory reporting limits in the ground water sample <br /> collected from the Domestic well located at 2450 Toste Road (DW2450) <br /> • The laboratory results of water samples collected in September 2001 of the microbiological <br /> analysis indicate low to moderate populations of organisms capable of gasoline and diesel <br /> metabolism However, nutrient concentrations are at moderate to high levels for ongoing <br /> bioremediation Analytical results of the ground water samples collected in September 2001 <br /> are summarized in Table 4 <br /> • A mass balance calculation was performed to determine the mass of TPH-g- and <br /> TPH-d-impacted soil and the volume of adsorbed gasoline and diesel in the soil There is <br /> approximately 17,100 grams and 6 gallon of gasoline and 59,850 grams and 19 gallons of <br />�. diesel The extent of impacted soil is depicted in cross sectional view in Figure 5 and areal <br /> view in Figure 6 Analytical results of soil samples are summarized in Table 5 and the mass <br /> balance calculations and assumptions are presented in Appendix C <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends the site be considered for closure <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation were made from a limited number of <br /> available data points (i a ground water monitoring well samples) and subsurface conditions may <br />' vary away from these data points No other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report <br /> 1 . <br /> • Advanced GeoEnvironmental Inc <br /> I <br />