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' May 1, 1998 Page 2 samples were then transported to Sequoia Analytical, a state-certified laboratory located in Redwood City, California, accompanied by chain-of custody documentation ' FINDINGS UST Area _ ' On February 4, 1998, Balch Construction removed the USTs Ron Hiltscher, an inspector from the City of Stockton Fare Prevention, and Michael Kith, Environmental ' Health Specialist from the San Joaquin County Public Health Services (SJCPHS), were present to observe the UST removals The USTs were observed to be in good condition, with no holes or stairung observed The USTs were transported by Enckson ' to their facility in Richmond PEG collected a total of seven soil samples, designated GTI-A through GT3-C, from ' beneath the locations of the three removed gasoline USTs Soil samples designated DT-1 and DT-2 were collected beneath the location of the removed diesel UST These samples were collected at depths of approximately 16 feet below ground surface (bgs), ' approximately 2 feet into native soil All samples, except for GT3-C, exhibited field evidence of hydrocarbon impact (i e hydrocarbon staining and/or odor) It is noted that the hydrocarbon staining and odor observed in the samples appeared weathered and had Bpi a heavy-end hydrocarbon odor At the direction of Harlin Knoll, Senior Environmental Health Specialist from SJCPHS, soil samples were collected from potholes at a depth of ' 20 feet bgs to assess the vertical extent of hydrocarbon impact These soil samples, Much were designated NE, SE, NW, and SW, did not exhibit field evidence of hydrocarbon impact Sample locations are shown on Figure 2 ' On February 9, 1998, based on field observations of hydrocarbon impact, and in an effort to remove as much hydrocarbon impact as practical, the remaining UST area soil was ' excavated to a total depth of approximately 20 feet bgs The extent of the final UST excavation measured approximately 30 feet by 40 feet and 20 feet deep IProduct Dispenser and Piping Areas On February 13, 1998, at the direction of Mr Harlin Knoll, PEG collected soli samples beneath each former product dispenser The gasoline dispenser samples were designated PD-1 through PD-5, and the diesel dispenser sample was designated DPD The soil samples were collected at depths of approximately 2 feet below each dispenser Sample locations are shown on Figure 2 Except for sample PD-4, the product dispenser areas did not exhibit field evidence of petroleum hydrocarbon impact The sample PD-4 exhibited a strong hydrocarbon odor Therefore, hmited excavation was performed in this area to a depth of 12 feet, the maximum obtainable depth for the 311 i 79]A/SOILREP