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TreadwelMollo <br /> Jeffery Wong <br /> San Joaquin County Environmental Division <br /> 14 April 2004 <br /> Page 3 <br /> cleanup. DTSC has concurred that the SJCEHD can exercise oversight of the site provided that <br /> the RAOs are meet. <br /> The limits of the excavation as of 12 April 2004 are shown on Figures 2 and 3. Confirmation <br /> soil sample locations are shown on Figure 3. Table 2 presents the results of the soil confirmation <br /> analyses with confirmation soil samples that have been removed through additional excavation <br /> shown with a strike through the name. The maximum depth of continued excavation will not <br /> exceed 15 feet below ground surface, to stay above the groundwater surface maintain sidewall <br /> stability. <br /> We believe that we will reach the extents of contamination above the RAOs by the end of this <br /> week and we will begin to backfill the excavation in accordance with the backfill specifications <br /> of the project. A parking area and access roadway are planned to be constructed at the ground <br /> surface. A groundwater investigation will be conducted upon project completion with <br /> groundwater monitoring or remediation to be conducted based on the results of the investigation. <br /> Please call with any questions. <br /> Sincerely yours, <br /> TREADWELL&ROLLO, INC_ <br /> D GFDi <br /> G <br /> QQ' 0 .� <br /> �- No. 7066 <br /> David G. Dixon, (P =�Q Philip G. Smith,REA II, CPGS <br /> Senior Project Manager � p4, <br /> GPrincipal <br /> Ofi A�1F <br /> Attachments: Figure 1 —Site Vicinity <br /> Figure 2—Site Plan <br /> Figure 3—Excavation Limits and Sample Identification <br /> Table 1 —Historic Soil Analytical Results for Petroleum Hydrocarbons and VOCs <br /> Table 2—Confirmation Sample Results <br /> Attachment A—Historic Groundwater Results from AGE <br /> cc Jim Reinhart, City of Stockton Mayors Office <br /> Lorraine Islas; City of Stockton Mayors Office <br /> Area 15 Excavation Work Plan <br />