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DWorkplan- ; Moffat Boulevard Property August 8,2013 PURPOSE AND SCOPE OF WORK The purpose of the proposed additional subsurface investigation will be to evaluate whether past use of the waste water sump and/or the on-site septic disposal system resulted in significant discharges of hazardous substances to the subsurface at the subject site. Prior to drilling and sampling activities, we will direct a geophysical survey to evaluate the nature of the underground features associated with the sump and septic system. In conjunction with the geophysical work, the sump covers will be removed and observable conditions within the sump will be evaluated. Based on the information gathered regarding the sump and septic system, we will select up to five exploratory drilling locations; preliminarily selected boring locations are shown on Plate 2. The geophysical contractor will be directed to clear the selected boring locations of underground utilities. Additionally, we will contact Underground Service Alert to further clear the boring locations. As required, a boring permit application will be processed with the San Joaquin County Environmental Health Department. The application process includes preparation and submittal of a Workplan, a Health and Safety Plan, a permit application form, a Licensed Contractors Declaration form, and a Master File Record form. Following approval of the County boring permit application, we will advance five borings at the site. Three of the borings will be advance in the vicinity of the sump and septic tank; these borings will be advanced to a depth of about 15 feet. Two borings will be advanced in the area of the septic leach field at the site; these borings will be advanced to a depth of about ten feet. Continuous soil sampling will be performed in the borings; and samples will be retrieved in accordance with standard environmental protocol. Following the drilling and sampling activities the borings will be back-filled with neat-cement grout, and the pavements will be patched at the boring locations. Drilling and sampling activities will be overseen by a Professional Geologist from our office. Soil samples collected from the borings will be submitted to a State-certified analytical laboratory for analysis for volatile organic compounds (VOCs), petroleum hydrocarbons, and metals. Following the field activities and the laboratory testing, we will prepare a summary report which will include descriptions of our procedures and observations, a scaled site plan drawing, the chemical data, discussion regarding the conditions encountered and the signature and stamp of the Professional Geologist in charge of the project.