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4. Clear utilities, drill and install six groundwater monitoring wells, three in the B horizon and three in the C horizon, to further define the lateral and vertical extent of impact from petroleum hydrocarbon range constituents in subsurface groundwater; 5. Collect soil samples in five-foot intervals for classification by the United Soils Classification System (USCS) and field screening using a hand-held photo-ionization detector. Soil samples indicating potential source contamination during field screening will be submitted for laboratory analyses including TPHg, TPHd, TPH-MO, BTEX, fuel oxygenates MTBE, DIPE, ETBE, TAME, TBA, naphthalene, 1,2 dichloroethane (1,2-DCA), ethylene dibromide (EDB), and total lead. Any soil samples containing detectable concentrations of TPH-MO will be additionally analyzed for VOCs, semi-VOCs, and title 22 metals. 6. Survey the newly installed groundwater monitoring wells to a municipal benchmark. The location and elevation of measuring marks at the wellhead will be surveyed to the nearest 0.01 foot by a licensed land surveyor; 7. Gauge, purge and sample all groundwater monitoring wells associated with the site (MW-1; MW-3 and MW-4; MW-6 through MW-20C). Continue to sample and analyze all groundwater monitoring wells for TPHg, TPHd,BTEX,MTBE,DIPE, ETBE, TAME, TBA, naphthalene and 1,2-DCA, on a semi-annual basis. Recommended groundwater analyses may alter based on the results of this proposed assessment; 8. Prepare and submit to the RWQCB an additional site assessment report that includes an updated site conceptual model and provides recommendations with respect to the Low-Threat Closure Policy(LTCP). Each part is described in further detail in the following sections. 5.1 Health and Safety Plan IES has established a Safety and Health Program(SHP)to ensure the personal health and safety of all IES employees. The SHP defines safety practices and procedures to be instituted in all IES work places, as applicable. The program meets the requirements promulgated by the Occupational Safety and Health Act (OSHA). As part of the SHP, all IES personnel are appropriately trained and under a Medical Surveillance Program in accordance with OSHA 40 CFR 1910.120. IES's primary mechanism to ensure employee, environmental, and public safety at the project site is the Health and Safety Plan (HASP). IES will update the existing HASP for this project to address the additional hazards associated with work in traffic zones. All individuals working under the purview of IES will be required to read and sign the HASP to acknowledge their understanding of the information contained within. The HASP is site-specific and task-specific, describing hazardous conditions that may be encountered and prescribes the necessary safety protocols to protect employees from these hazards. The HASP will be reviewed by the project management team and then reviewed and approved for field use by the Site Safety and Health Officer. The HASP will be implemented and enforced on site by the assigned Site Safety and Health Officer. California Tank Lines Innovative Environmental Solutions Addendum to Work Plan -3- Encinitas,California