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McDowell&Davis Towing <br /> Subsurface Soil&Groundwater Investigation <br /> Page: 2 <br /> 40 feet in depth with no odor or soil discoloration encountered. Laboratory <br /> samples were obtained from various depths including the bottom of this boring. <br /> All samples were reported as "non-detect for the compounds analyzed" by the <br /> analytical laboratory. <br /> Boring B-2 was drilled in the fuel island area, PL# 7, where soil contamination <br /> was disclosed during the tank removal. Petroleum contamination was apparent in <br /> the soil to a depth of about 20 feet. This boring was drilled to 45 feet in depth in <br /> order to terminate in a silt or clay soil. Sandy soils were encountered between 20 <br /> and 40 feet in depth. Apparent contaminationand laboratory soil samples were <br /> non-detect below the 25 foot sample. <br /> Boring B-3 was drilled southeast of boring B-2 between the two fuel islands to <br /> help provide lateral definition of the contaminants. This boring was drilled to 20 <br /> feet in depth where apparent contaminants had diminished in B-2. No odor or soil <br /> discoloration was encountered. Laboratory soil samples were obtained at 15 and <br /> 20 feet in depth. All samples were reported as "non-detect for the compounds <br /> analyzed" by the analytical laboratory. <br /> Boring B-4 was drilled northeast of boring B-2 to help provide lateral definition of <br /> the contaminants. This boring was drilled to 20 feet in depth where apparent <br /> contaminants had diminished in B-2. No odor or soil discoloration was <br /> encountered. Laboratory soil samples were obtained at 15 and 20 feet in depth. <br /> All samples were reported as "non-detect for the compounds analyzed" by the <br /> analytical laboratory. <br /> Laboratory Soil Sam le Results 1/28/00 <br /> S e I.D. Gasoline Benzene Toluene E-Benzene X lens MTBE 8260 <br /> B-1-20' ND ND ND ND ND ND NA <br /> B-1-25' ND ND ND ND ND ND NA <br /> B-1-35' ND ND ND ND ND ND NA <br /> B-1-40' ND ND ND ND ND ND ND <br /> B-2-15' 2600 860 120000 51000 4onq 87000 NA <br /> ND ND 11 ND 48 36 NA <br /> B-2-25' <br /> B-2-35' ND ND ND ND ND ND NA <br /> B-2-45' ND ND ND ND ND ND ND <br /> B-3-15' ND ND ND ND ND ND NA <br /> B-3-20' ND ND ND ND ND ND ND <br /> B-4-15' ND ND ND �NZD� ��ND ND NA <br /> B-4-20' ND ND ND ND ND <br /> ND=Non Detect NA=Not Analyzed <br /> Mg/Kg for gasoline WlKg for BTEX,MTBE,and 8260 Oxygenated Compounds <br /> On March 20, 2000 San Joaquin County Environmental Health Department reviewed the <br /> analytical results from the investigation with a representative of the Regional Water <br /> Quality Control Board, Central Valley Region. The representative indicated that before <br />