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i <br /> �n rporationA Mr of The IT Group <br /> Yl <br /> Ms.Margaret Lagono Project 880-040.1A <br /> March 15, 2000 <br /> Page 4 <br /> • Impacted soil remains at depths grater than 10 feet below the location of D-1 <br /> and at depths greater than 8 feet bgs below D-8. <br /> • Groundwater was not encountered during additional over-excavation activities. <br /> • TPH-g was detected at concentrations ranging from below the detection limit of <br /> 1.0 mg/kg in sample D-1 @ 10 W, D-1 @ 10 E, D-5 @ 5 C and D-8 @ 8 NE to <br /> 4,110 mg/kg in sample D-1 @ 10 C. <br /> • Benzene was detected in samples D-1 @ 10 W at 0.00784 mg/kg and <br /> 8.47 mg/kg in sample D-1 @ 10 C. Benzene was not detected in any other <br /> samples collected during overexcavation activities. <br /> • MtBE was detected at concentrations ranging from below the detection limit of <br /> 0.1 m gin sample D-5 @ 5 C to 8.08 m gin sample D-3 @ 4.5 C. <br /> Should you have any questions regarding the contents of this letter, please feel free to <br /> call us at (916) 928-3300. <br /> Sincerely, <br /> IT CORPORATION <br /> Kathleen A. Waldo Mark Capps, RG 6561 <br /> Staff Engineer Project Geologist <br /> Attachments: Table 1 —Product Line &Dispenser Sampling Soil Analytical Data <br /> Table 2—Over-excavation Soil Sampling Analytical Data <br /> Table 3 —Over-excavation Oxygenate Analytical Data <br /> Yg Yt <br /> Figure 1 —Site Map <br /> Figure 2—Product Line & Dispenser Sampling Map <br /> Figure 3 —Over-excavation Soil Analytical Results <br /> Figure 4— Stockpiled Soil Locations <br /> Attachment A—Field and Laboratory Procedures <br /> Attachment B—Certified Analytical Reports and Chain-of-Custody <br /> Documentation <br /> cc: Mr. Michael Kith, San Joaquin County Environmental Health Department <br /> Mr. Jim Parkinson, Parkinson Arco <br /> IT CORPORATION <br /> SAC:\\\SACRFP 1\COMMON\rancfp 1\Projects\Projects\880\040\8800401 A.as.doc-98\mem:1 <br />