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y Manteca Unified School District <br /> Soil&Groundwater Investigation Report II <br /> Page:2 <br /> On December 6, 2000 M. J. Kloberdanz & Associates drilled three soil borings to various <br /> depths in the area around the former dispenser and underground diesel tank. <br /> Boring B-1 was drilled 1.25 inch diameter drill between the former dispenser and <br /> underground diesel tank to a depth of 30 feet with no odor or soil discoloration <br /> encountered. Laboratory soil samples were collected and analyzed from the 10, 15, 20 <br /> and 30 foot depths. Low levels of diesel range petroleum hydrocarbons were present in <br /> all of the samples. Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) were not <br /> detected in the soil samples. Groundwater sampling was conducted by driving a <br /> hydropunch type well screen from 20 to 24 feet in depth. A water sample could not <br /> collected from the boring. <br /> Boring B-2 was drilled inside the shop building, southwest of the former diesel dispenser <br /> with a 2 inch continuous core barrel. The boring was advanced to a depth of 24 feet <br /> without encountering petroleum odor or discoloration. Low levels of diesel range <br /> petroleum hydrocarbons were detected in soil samples collected from 8, 16, and 24 foot <br /> depths. A water sample, collected from the boring contained, trace levels of diesel range <br /> petroleum hydrocarbons. BTEX was not detected in either the soil or water samples. <br /> Boring B-3 was drilled inside the shop building, northwest of the former diesel dispenser, <br /> with a 2 inch continuous core barrel to a depth of 24 feet. Petroleum odor or <br /> V <br /> discoloration was not encountered in the boring. Low levels of diesel range petroleum <br /> hydrocarbons were detected in laboratory soil samples collected from the 8, 16, and 24 <br /> foot depths. A water sample, collected from the boring contained, trace levels of diesel <br /> range petroleum hydrocarbons. BTEX was not detected in either the soil or water <br /> samples. <br /> V <br /> Table of Laboratory Soil Sample Results (12-6-2000) <br /> Sample I.D. Diesel Benzene Toluene E-Benzene Xylenes <br /> B-1-10' 5.5 ND ND ND ND <br /> B-1-15' 7.8 ND ND ND ND <br /> B-1-20' 3.5 ND ND ND ND <br /> B-1-30' 4.8 ND ND ND ND <br /> 13-2-8' 4.2 ND ND ND ND <br /> B-2-16' 3.9 ND ND ND ND <br /> ' <br /> 13-2-24' 7.3 ND ND ND ND <br /> 13-3-8' 5.6 ND ND ND ND <br /> 133-16' 3.8 ND ND ND ND <br /> r+ B-3-24' 68 ND ND ND ND <br /> ND=NON-DETECT J Mg/Kg for diesel µg/Kg for BTEX <br /> Table of Laboratory Groundwater Sample Results (12-6-2000) <br /> Sample I.D. Diesel Benzene Toluene E-Benzene Xylenes <br /> B-1 NA NA NA NA NA <br /> B-2 0.54 ND ND ND ND <br /> B-3 0.21 ND ND ND ND <br /> ND=NON-DETECT Mg/L for diesel µg/L for BTEX <br /> V <br />