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RECEIVED JUN 302016 Work Plan Addendum - April 2016 SAVE-ON GAS (Former Rainwater Car Wash) ENVIRONMENTAL 420 West Yosemite Avenue, Manteca, California HEALTH DEPARTMENT 1.0. INTRODUCTION Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed work plan addendum for 420 West Yosemite Avenue, California (site). The enclosed work plan addendum is being prepared in accordance with a Regional Water Quality Control Board (RWQCB) Central Valley Region letter dated 16 February 2016 stating that a work plan should be prepared to delineate the extent of petroleum impacts using a grab groundwater sampling technology. This work plan addendum provides a description of the scope of work and procedures to be used for Cone Penetration Testing (CPT) soil boring advancement, grab groundwater sample collection, and laboratory analysis. The plan was prepared in accordance with RWQCB guidelines for the investigation of underground storage tank (UST) sites. CPT soil borings P7 through P10 were previously advanced on- and off-site to log lithology and for collection of grab groundwater samples. Additional site background information is included in Appendix A. Boring logs for CPT borings previously advanced on-site and off-site are included with Appendix B. The location of the site is illustrated on Figure 1; a plan of the site is illustrated on Figure 2; general lithology beneath the site is depicted in Figure 3; the estimated extent of dissolved MTBE is depicted in Figure 4. 2.0. SCOPE OF WORK Based on analytical data from previous site assessment, the RWQCB is requiring (letter dated 16 February 2016) that additional groundwater investigation be performed to fully delineate the lateral and vertical extent of the petroleum hydrocarbon contamination. The proposed scope of work will include the following tasks: • Permitting and pre-field work activities; • CPT soil boring advancement and sample collection; and • Report preparation. Each of these tasks is described in greater detail below. 2.1. PRE-FIELD WORK ACTIVITIES Applicable drilling permits will be obtained from the San Joaquin County Environmental Advanced GeoEnvironmental,Inc.