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Manteca Unified School District <br /> Subsurface Soil &Groundwater lnv�gation <br /> groundwater flow will be calculated. A survey of water wells located within a 2000-foot <br /> radius will be conducted and well details, if available, obtained. <br /> 1.1 Site Description and History <br /> Two underground fuel tanks were removed under permit in November 1998 by <br /> SEMCO. Moderately high levels of diesel were present in the sample (Diesel D-2 <br /> @ 3') collected from three feet in depth under the diesel fuel dispenser. No other <br /> fuel constituents including MTBE by method 8260 were reported for soil sample <br /> Diesel D-2 @ 3'. Samples collected from the diesel and gasoline tank excavation <br /> and the gasoline dispenser were non-detect for the compounds analyzed. <br /> Table of Laboratory Sample Results (November 1998) <br /> Sample I.D. Gasoline Diesel Benzene Toluene E-Benzene Xylenes 8260 Lead <br /> Gas D-I(&3' ND NA ND ND ND ND ND 46 <br /> Diesel D-2,6aD3' NA 1100 ND ND ND ND NA NA <br /> West 1(&10' ND NA ND ND ND ND ND 8 <br /> West 2(x,9.5' NA ND ND ND ND ND NA NA <br /> SP-1 ND NA ND ND ND ND ND 11 <br /> SP-2 NA ND ND ND ND ND ND NA <br /> ND=Non Detect NA=Not Analyzed Gasoline&Lead in mg/Kg BTEX&8260 inµg/Kg <br /> On December 6, 2000 M. I Kloberdanz & Associates drilled three soil borings to <br /> various depths in the area around the former dispenser and underground diesel <br /> tank. <br /> Boring B-1 was drilled between the former dispenser and underground diesel tank <br /> to a depth of 30 feet with no odor or soil discoloration encountered. Laboratory <br /> soil samples were collected and analyzed from the 10, 15, 20 and 30-foot depths. <br /> Low levels of diesel were present in all of the samples. A water sample was not <br /> collected from this 1.25 inch diameter boring because the water bearing zone <br /> between 20 and 24 feet would not produce enough water. <br /> With a 2 inch continuous core barrel, Boring B-2 was drilled inside the shop <br /> building to the south west of the former diesel dispenser to a depth of 24 feet with <br /> no odor or soil discoloration encountered. Laboratory soil samples were collected <br /> and analyzed from the 8, 16, and 24-foot depths. Low levels of diesel were <br /> present in all of the samples. A water sample was collected from this boring <br /> because of the larger diameter borehole produced sufficient water to collect a <br /> sample. The water sample contained trace levels of diesel. No BTEX was <br /> detected in either the soil or water samples. <br /> Boring B-3 was drilled inside the shop building, located northwest of the former <br /> diesel dispenser. The boring was advanced with a 2-inch continuous core barrel <br /> to a depth of 24 feet with no odor or soil discoloration encountered. Laboratory <br /> soil samples were collected and analyzed from the 8, 16, and 24-foot depths. Low <br /> levels of diesel were present in all of the samples. A water sample was collected <br /> 2 <br />