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z , . Protect No 58100-0648 June 21, 1995 Page 4 PURPOSE The purposes of the Phase 1 and Phase 2 work requested by Caltrans are as follows 1 To re-establish groundwater sampling capability for the onsite wells that were previously temporarily decommissioned 2 To perform a groundwater monitoring event and obtain current groundwater quality data beneath and in the vicinity of the former USTs 3 To measure the current concentrations of residual TPHg in vadose zone and capillary fringe soil beneath the former USTs 4 To perform a supplemental vapor extraction test (VET) and acquire field data sufficient to design a vapor extraction system to remediate soil and groundwater beneath the site 5 To review current groundwater quality data and re-evaluate the distribution of dissolved TPHg and benzene beneath the site • 6 Based on the current concentrations and distribution of TPHg and benzene in groundwater, evaluate whether a groundwater pump test and formal groundwater remediation are warranted PHASE 1 SCOPE OF WORK Task I - Prefield Activities • A pre-work site visit was conducted on April 28, 1995 with Caltrans contract manager, Mr Saiyed Alt to inspect the work area At the pre-work site visit, the Site Visit Checklist and Completion Schedule was discussed and signed by the Geocon project manager and the Caltrans contract manager • Prepare a Health and Safety Plan for the proposed field activities The Health and Safety Plan will address the use of personal protective equipment (PPE) during the proposed field activities • Contact the San Joaquin County Public Health Services to determine permitting requirements for the proposed groundwater monitoring well restoration work and the installation of the vapor extraction wells G Contact the local public utilities via Underground Service Alert, to attempt to delineate . subsurface public utilities and conduits in proximity to the proposed boring/well locations