Agmt00 Mark Thomas Co, Inc - Laserfiche WebLink

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Aerially Deposited Lead Our sub consultant, GEDeON, will test for aerially deposited lead where the roadway is to be widened in accordance with Caltrans procedures and guidelines. In general, GEDeON will excavate 65 hand auger borings to a maximum depth of 0.76 m within the proposed roadway widening area. Soil samples collected from 0.0 to 0.15 m, 0.30 m to 0.46 m, and 0.61 to 0.76 m below ground surface and will be submitted for laboratory analysis. The borings will be advanced at 100 meter intervals along the shoulders and median for a total of 57 borings. In addition, approximately 8 borings will be advanced along ramps at the Route 84/101 interchange. Traffic control for shoulder closures will be provided as required by Caltrans. A Draft report will be prepared in general confonnance to Caltrans requirements to summarize the results of the field activities and laboratory testing and submitted to the City of Redwood City for review. Review comments will be incorporated and a final report will be prepared (four copies). Phase II Testing (Haz Mat) Based on the preliminary findings outlined in the Initial Site Assessment, our sub consultant, GEOCON, will take soil samplings and do testing for soil and groundwater contamination. It is estimated that 10 soil samples and 5 grab groundwater samples will be collected for laboratory analysis. Chemical analyses will be perfonned on all samples. The suite of laboratory analysis includes: . Total Metals (EP A Method 6010) . TPHg/BTEX/MTBE (EP A Method 8020) . TPHdJmo (EPAMethod 8015) . VOCs (EP A Method 8260) This task includes securing pennits from San Mateo County for drilling. Utilities Existing utilities will be positively identified in accordance with Caltrans' Policy on High and Low Risk Underground Facilities Within Highway Right of Way. Letters requesting systems maps and "as-builts" will be sent to all utility companies known to have facilities in the area. Existing utilities will be added to the plans and sent to respective utility companies for verification. Conflicts between proposed improvements and utilities will be identified on the plans and sent with letters to the utility companies requesting that they prepare relocation plans. Notice to owners requesting that the utilities be relocated as shown on the plans will be mailed. High risk utilities that need to be positively identified according to Caltrans policy will be potholed and field surveyed. Potholing City of Redwood City - Route 84 (Woodside Road) Widening Proposal- PS&E 08/08/00 7 of 10