ARCHIVED REPORTS_2019-MAY 15 SITE ASSESSMENT REPORT

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Site Assessment Report Former SAN JOAQUIN COGENERATION 17200 Murphy Parkway, Lathrop, San Joaquin County, California (APN 198-120-05) 1.0. INTRODUCTION At the request of Heorot Power Holdings LLC (“HPH”), Advanced GeoEnvironmental, Inc. (AGE) has prepared this Site Assessment Report for the property located at 17200 Murphy Parkway, Lathrop, California (herein referred to as site or subject property). The scope of work included a geophysical survey, advancement of forty-three (43) soil borings, installation of four (4) shallow-screened groundwater monitoring wells (MW -1 through MW -4), a location and elevation survey of borings and wells, removal of investigation derived waste and preparation of this report. The scope of work was performed to: 1) identify and evaluate areas on the site that are comprised of unpermitted landfill waste which may have resulted in discharge of pollution to the subsurface; and 2) investigate and assess if historical use of the property as agricultural land, a solid waste disposal facility and a natural gas power plant have adversely affected the subsurface of the site. The site and surrounding area are illustrated in Figure 1. A site plan depicting site features, boring and well locations, the former waste cells east of the site and waste cells identified onsite during the investigation is presented in Figure 2. A site plan depicting the east property boundary area is presented in Figure 3, and site plans depicting the former power plant area are presented in Figures 4 and 5. Site background and historical information was provided in the Site Historical Activity Report, Amended August 2018, and Initial Site Investigation Work Plan – Final dated 31 August 2018. The scope of work and field procedures for the investigation were outlined in the AGE- prepared, Initial Site Investigation Work Plan – Final (work plan), dated 31 August 2018. The work plan was approved by Central Valley Regional Water Quality Control Board’s (CVRWQCB), Initial Site Investigation Work Plan Conditional Approval letter dated 15 January 2019. AGE prepared an email dated 17 January 2019 to address the comments provided in the conditional approval letter. Following the geophysical survey performed at the site, the scope of work was finalized by telephone and email correspondence with the CVRWQCB between 26 February and 06 March 2019. The CVRWQCB approval letters and pertinent email correspondence are provided in Appendix A. 2.0. PRE-FIELD WORK ACTIVITY Soil boring and monitoring well drilling permits were obtained from the San Joaquin County Environmental Health Department (EHD) prior to field activities. Copies of the approved EHD drilling permits are provided in Appendix B.