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IT Corporation <br /> A Member of The IT Croup <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 /> 10 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 mg/kg in sample D-5 @ 5 C to 8 08 mg/kg in 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 /> Ila <br /> Kathleen A Waldo Mark Capps, RG 6561 <br /> Staff Engineer Project Geologist <br /> Attachments Table l --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 /> 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 i%COMMONIrancfpIWroiects\Projects\880\040\8800401A as doc-981mem 1 <br />