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r ENVIRONMENTAL GROUP, INC. rARDENT July 12, 2017 Project No. 100834003 Ms. Kasey Foley San Joaquin County Environmental Health Department 1868 HazeIton Avenue Stockton, California 95205 Subject: Revised Proposed Scope of Work to Abandon Groundwater Monitoring Well 1627 Army Court Stockton, California 95206 Dear Ms. Foley: As per our telephone conversation yesterday, this letter presents my proposed revised scope of work to abandon the groundwater monitoring well located at 1627 Army Court in the city of Stockton, California (site; Figure 1). Our client has recently purchased the site for continued commercial use. During completion of a Phase I Environmental Site Assessment (ESA), Ardent discovered a document suggesting that two groundwater monitoring wells had been installed on the site in the 1980s. One well was visually present during our site visit, while the other was not observed and was thought to have possibly been paved over. Ardent recommended that the wells be abandoned in accordance with current regulatory guidelines. On June 19, 2017, Ardent submitted a work plan to the San Joaquin County Environmental Health Department (SJCEHD) to complete a geophysical survey to locate the missing well and to abandon the wells by over-drilling and destroying the casing to the bottom of the borehole. The work plan/permit was approved on July 5, 2017. On July 7, 2017, Ardent retained Safe-2-Core of San Jose, California, to complete the geophysical survey using ground penetrating radar equipment over a large area that reportedly contained the missing well (Figure 2). No anomalies were encountered, and therefore, it is assumed that this well was previously abandoned. Ardent retained Cascade Drilling, L.P. of Richmond, California, a State 0-57 licensed drilling company to abandon the remaining well. 1827 Capital Street, Suite 103 • Corona, CA 92880 • (951) 736-5334 • www.ardentenv.com