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January 25, 2016 Monitoring Well Abandonment Workplan Table 1 Construction Information for Monitoring Wells to be Abandoned. Screened Well ID Date Drilled Diameter Depth Interval Proposed Land Owner (inches) (feet bls) feet bls Action CLSP CLSP-2 1/22/2003 2 16.5 6.5-16.5 Abandon Dos Reis Ranch,Inc.a CLSP-4 1 22 2003 2 16.5 6.5-16.5 Abandon City of Lathrop CLSP-10 11/17/2003 2 16 6-16 Abandon Alice J Widmera Mossdale MWM-14 5 17 2005 4 21 10-20 Abandon City of Lathrop MWM-16 5 17 2005 4 21 10-20 Abandon City of Lathrop MWM-26 5 18 2005 4 21 10-20 Abandon City of Lathrop River Islands MWR-6 12 2 1998 2 20 5-20 Abandon Califia LLCa MWR-13 10 26 1993 1 21 15-20 Abandon Califia LLCa MWR-15 1993 1.5 15.6b unknown Abandon Califia LLCa MWR-20 1993 1.5 15.4b unknown Abandon Califia LLCa a. Access granted b. Total depth measured from top of casing on 10/1/15 to 10/8/15 1.4. Equipment Decontamination Procedures On the basis of historic and current land use and existing groundwater monitoring data,no hazardous constituents are expected at the drilling locations.The following steps therefore represent the minimum decontamination procedures to be employed. • All equipment used for constructing the well must be free of contamination and cleaned to prevent potential cross contamination. Equipment,tools,materials,etc.will be decontaminated prior to the beginning of the abandonment work. • Some form of steam cleaning or high-pressure water-spraying technique combined with a low-suds non-phosphate detergent should be employed followed by rinsing with potable water.When adjacent to land application areas,the rinseate and drill cuttings should be spread on the ground at the site.When located in the street,the rinseate and drill cuttings should be placed within a drum. Discharge to stormwater drains or surface water features is not acceptable. 1.5. Health and Safety Plan No hazardous constituents or contamination are expected at the project site locations,and all work should be carried out in compliance with Occupational Safety and Health Administration (OSHA) regulations and guidelines.All personnel working at the site during well abandonment activities should be familiar with these regulations and guidelines. The primary physical hazards are associated with the use of the drilling rig and supporting vehicles. All drillers performing work must possess required C-57 license,and all drill crew members should Hydro Focus, Inc. 3