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Taber ,r Quincy Engineering, Inc. Since 1954 November 26, 2003 1P2/399/245-4 �. Soil Sampling Plan - DRAFT Route 99/Route 120 East (Yosemite Avenue) Interchange Project Manteca, California 1.0 INTRODUCTION `~ Following is a sampling plan for assessment of lead content in shallow soils expected to be excavated during construction of the proposed project. This plan presents technical elements for the proposed work along with a Site Health and Safety Pian. 2.0 SITE BACKGROUND 2.1 PROJECT LOCATION / GENERAL DESCRIPTION The site is located at the intersection of State Route 99 and State Route 120 (Yosemite Avenue) in Manteca, California (see Figure-1, "Vicinity Map"). Natural ground 'r surface at this site is essentially flat-lying at/near elev. 12.8-13.4±m. State Route 120 roadway grade is about elev. 13.05±, approximately 6.2±m below SR 99 grade at the bridge structure. Existing embankment side-slopes are typically at iv:2h inclination; end-slopes below the Route 99 bridges are at 1v:1.5h inclinations. The proposed roadway elements are shown on preliminary "Layout" drawings (sheets L-1, L-2, L-3, L-4 and L-5; scale 1:500; received via e-mail October 22, 2002) and "Typical Cross Sections" drawings (sheets X-1 and X-2; dated October 23, 2002) by Quincy Engineering, Inc. Existing on/off ramps are shown to be widened by approximately 1 m with finished grade typically at or slightly below existing. New fill slopes are indicated to be 1v:2h or flatter. Project construction limits along existing SR 99 on-ramps/off-ramps are indicated as follows: Ramp Station Interval 297+80.0 ("RTE 99" Line) to �. Southbound on-ramp 303+40.3 ("SB ON" Line) Southbound off-ramp 303+31.9 ("SB OFF" Line) to 307+05.0 ("RTE 99" Line) 299+57.5 ("RTE 99" Line) to Northbound off-ramp 303+14.6 ("NB OFF" Line) Northbound on-ramp 303+02.5 ("NB ON" Line) to 308+80.0 ("RTE 99 Line) 1 L.