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� s Lel F CONSULTANTS, INC. E N V I R O N M E N T A L a G E O T E C H N I C A L a M A T E R I A L S Project No. S8475-06-27 April 3, 2002 Michael Robinson, Contract Manager California Department of Transportation-District 10 1976 E. Charter Way Stockton, California 95201 Subject: ROUTE 99 STOCKTON LEAD AND ASBESTOS INVESTIGATION CONTRACT NO.43AO078 TASK ORDER NO. 10-445401-LQ SITE INVESTIGATION WORKPLAN Dear Mr. Robinson: In accordance with Caltrans Contract No. 43AO078 and Task Order (TO) No. 10-445401-LQ, Geocon Consultants, Inc. is submitting this Workplan for site investigation work to be conducted between Post Mile 18.6 and 23.0 on Route 99 in Stockton, California (the Site). This Workplan describes the scope of work requested by Caltrans and outlines procedures and methods to be employed by Geocon to complete the project. PROJECT LOCATION AND PROPOSED IMPROVEMENTS The Site consists of State right of way along the median and shoulders of Route 99 in Stockton, San Joaquin County, California. Caltrans intends to construct new lanes in both directions, modify five interchanges, widen three bridges, and construct five sound walls along Route 99 within the project boundaries. The approximate project limits are depicted on the Vicinity Map,Figure 1. PURPOSE The purpose of the scope of work outlined in TO No. 10-445401-LQ is to 1) evaluate whether impacts due to aerial lead deposition from motor vehicle exhaust exist in the surface and near surface soils within the project boundaries, 2) determine the potential presence of soil containing hazardous concentrations of lead in order to determine the applicability of the California Department of Toxic Substance Control (DTSC) variance with respect to excess soil generated during construction and its potential reuse within the Caltrans right of way, 3) evaluate whether impacts from metals due to paint residue exist in the surface and near surface soil beneath three bridges within the project boundaries,4)determine the presence and quantity of potentially lead-containing paints(LCP)on the bridge, and 5) determine the presence and quantity of potentially asbestos-containing materials (ACM)on the three bridges. The investigative results may be further used by Caltrans to inform the construction contractor of the presence of lead impacted soil (if encountered) within the project boundaries for health, safety and disposal purposes. The information obtained from the asbestos and LCP surveys will be used to coordinate asbestos and LCP abatement and/or work practices, if necessary, associated with the proposed bridge improvement activities. 11375 Sunrise Park Drive, Suite 100 2 Rancho Cordova, California 95742 v Telephone (916) 852-9118 3 Fax(916) 852-9132