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k`1 KLEINFELDER Development/Palm Plaza Center, ARMCO, Coit Drapery Service, and HF Hawley Chemical Company) are unlikely to have an impact on the subject property because of their distance to the site and the contamination of soil only. However, if contamination arises on the subject property, clean-up is usually the responsibility of the responsible party, e.g. Tosco, Mobil, BP, ARMCO, etc. For clarification, Palm Plaza Center is located adjacent to the south of the UPRR site, The other facilities are located approximately one half to one mile from both sites. At the time of our previous ESA, the undererossing project was not anticipated to encounter groundwater. It is our understanding that construction of the drilled shafts at the UPRR site will now encounter groundwater. Because the quality of the site groundwater is unknown, Kleinfelder recommended either using a shallow foundation system or sampling and analyzing site groundwater for Total Petroleum Hydrocarbons (TPH) as referenced to gasoline, Total Extractable Petroleum Hydrocarbons (TEPH) as referenced to diesel and motor oil, Benzene, Toluene, Ethylbenzene, and Xylene (BETX), and total lead related to reported releases from Tosco, Mobil, and BP facilities. The main concerns if groundwater contamination exists is potential exposure of workers to the contamination and the handling and disposal of the contaminated soil/groundwater. 3.0 SCOPE OF WORK Task I - Drilling Permit and Workplan Submittal Kleinfelder will install up to two temporary monitoring wells on March Lane in borings advanced by truck mounted drill rig. The San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) requires a workplan and permit application for the installation of temporary monitoring wells. The proposed temporary monitoring well installations will require permits, and a workplan will be submitted to PHS/EHD. Kleinfelder will also prepare a health and safety plan for use in the field. Because the proposed temporary wells are located within March Lane, we will require traffic control for a lane closure and an encroachment permit. Task 2 - Temporary Monitoring Well Installation and Soil Sample Collection The two (2) temporary monitoring wells will be installed at March Lane at the UPRR to a total depth of approximately 60 feet. Approximate first groundwater is currently estimated to be at a depth of 53 feet below the ground surface (bgs) based on our borings drilled for our previous geotechnical investigation. The temporary monitoring wells will be installed using a truck- mounted drill rig equipped with 8-inch hollow stem augers. Soil samples will be collected at a depth of 5 feet and at 5 foot intervals. The borings will be drilled, logged, and sampled following the protocol described in Attachment B. Two-inch diameter temporary wells will be constructed in the borings, as described in Appendix B, Section B-3.1. The wells will be screened from a depth of 50 to 60 feet. The temporary wells will be installed at the following locations., 20-3712-08.E01/2018P098 Page 2 of6 © 1998 Kleinfelder, Inc. April 8, 1998