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i 1� Taber Inc.Quincy Engineering, Since V54 November 26, 2003 1 P2/399/245-4 2.3 GROUNDWATER Taber Consultants May 29, 2003 report indicates groundwater was encountered �. in 10 of 16 borings with a shallowest reported groundwater depth of 6.9 m (elev. 7.01 m). Based on this data, groundwater is not expected to be encountered during ADL sampling. 2.2 RIGHTS-OF-ENTRY All sampling will be performed within Caltrans right of way. Quincy Engineering, Inc. has applied for a Caltrans encroachment permit specifically including the sampling work described herein. Sampling will not be performed until the permit has been granted. A copy of the permit will be in the possession of Taber personnel while on the project site. 2.3 PRIOR WORK We have no information indicating the existence of other possible hazardous materials pertaining the project site. Taber Consultants prepared a "Roadway Geotechnical Report" for the project dated May 29, 2003. 3.0 SOIL SAMPLING PLAN The purpose of the proposed work is to evaluate lead concentrations within soil expected to be excavated during project construction and to estimate classification of the soil with respect to State and Federal hazardous waste criteria. Sampling and testing for aerially deposited lead (ADL) will be limited to unpaved ` areas of the interchange portion of the project, including the Highway 120 median and Highway 99 median, shoulders and ramps. Areas of existing pavement do not require �.• testing. Based on discussions with Quincy Engineering and Caltrans, construction on SR 120 east and west of the interchange ramps will be limited to areas of existing pavement except along the south shoulder at about Sta. 25+50 to Sta. 27+00 where a �- previous, nearby ADL assessment is understood to provide sufficient assessment. As such, project areas beyond the interchange ramps are excluded from the area of study. 3