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AdvancedGeo <br />Environmental <br />12 July 2019 <br />AGE Project No. 13-2947 <br />Mr. Michael Kith <br />San Joaquin County Environmental Health Department — Site Mitigation <br />1868 E. Hazelton Avenue <br />Stockton, CA 95205 <br />Subject: Well Destruction Work Plan <br />Levand Family Trust <br />47 East Eleventh Street, Tracy, California <br />Dear Mr. Kith: <br />Advanced GeoEnvironmental, Inc. (AGE) has prepared this work plan for the destruction <br />of groundwater monitoring wells at 47 East Eleventh Street, Tracy, California (site). A total <br />of ten (10) groundwater monitoring wells are located on and offsite. All of the groundwater <br />monitoring wells are single-completed with 2-inch diameter well casings in an 8-inch <br />diameter borehole. The site and the surrounding area are illustrated in Figure 1. <br />Structures, soil borings, and well locations are illustrated in Figure 2. Well construction <br />details are summarized in Table 1. <br />This work plan was prepared in accordance with Central Valley Regional Water Quality <br />Control Board (CVRWQCB) directive letter dated 17 May 2019 (Appendix A). <br />INTRODUCTION <br />In October 2013, a leaking underground storage tank (UST) case was initiated at the site <br />based on the detection of gasoline range petroleum in the soil during the removal of three <br />USTs on site. A Notice of Responsibility was provided to the Levand Family Trust in March <br />2014, which required additional assessment and investigation of the unauthorized <br />release. In February 2015 and June 2016, AGE performed limited subsurface <br />investigations of soil and groundwater contamination near the former UST locations at <br />the site. Additionally, as part of the subsurface investigation of the former UST area, <br />groundwater monitoring wells MW-1 through MW-10 were installed at the site in June <br />2016. Well construction details are summarized in Table 1. <br />837 Shaw Road • Stockton, CA 95215 <br />Telephone (800) 511-9300 • Fax (888) 445-8786 <br />An Employee-Owned Company