Laserfiche WebLink
1 <br /> PRELIMINARY REPORT AND TANK CLOSURE REPORT <br /> Tracy Boulevard Shell <br /> 3725 Tracy Boulevard,Tracy,California <br /> Delta Project No.40.89-012 <br /> Page 8 <br /> Existing Location for the New Underround Stornge Tanks—Four of the soil borings were drilled within <br /> the area of the existing underground storage tanks(S13-7 through SB-10). Four soil samples,collected <br /> at depths of 11 feet below the ground surface,were sent to the laboratory for chemical analysis of <br /> BTEX and TPH. Concentrations of BTEX and TPH from soil samples collected from soil borings SB-7, <br /> SB-8,and SB-9 were below the detection limits of 0.002 and 0.2 ppm,respectively. The soil sample <br /> analyzed from SB-10 indicated concentrations of BTEX ranged from 0.01 to 0.04 ppm. The TPH <br /> concentration was 140.0 ppm and was identified as Stoddard solvent. <br /> Location of Former Underground Storage Tanks--Four soil borings were drilled near the former <br /> underground storage tanks(SB-1,SB-2,SB-3,and SB4). Four soil samples,collected at depths of 11 <br /> feet below the ground surface,were sent to the laboratory for chemical analysis of BTEX and TPH. <br /> Concentrations of BTEX from soil samples collected from soil borings SB-1 through SL'-4 were below <br /> the analytical method detection limits. Concentrations of TPH from soil samples collected from SB-2 <br /> and SB-3 were below detection limits of 0.5 and 0.2 ppm,respectively. Soil samples from SB-1 and S134 <br /> contained concentrations of TPH at 77.0 and 11.0 ppm,respectively,and were identified as Stoddard <br /> solvent or light petroleum distillate. <br /> Soil Samples From Monitoring Well Locations and Soil Boring SB-11--Three soil borings were drilled <br /> at well locations MW-1,MW-2,and MW-3 and were converted to monitoring wells. Thre:soil samples, <br /> collected at depths of 6 feet below the ground surface,were sent to the laboratory for chemical analysis <br /> of BTEX and TPH. Concentrations of BTEX and TPH were below the analytical method detection <br /> -- limits of 0.002 and 0.2 ppm,respectively. <br /> — Soil boring SB-11 was drilled in order to determine whether petroleum hydrocarbons or solvents were <br /> present in soils beneath the front of the service station. One soil sample,collected at a depth of 6 feet <br /> below the ground surface, was sent to the laboratory for chemical analysis of BTEX and TPH. <br /> Concentrations of BTEX and TPH were below the analytical method detection limits of 0.002 and 0.2 <br /> ppm,respectively. <br />