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Monitoring Well Installation Work Plan Addendum MCBILLIN REAL ESTATE INVESTMENT ffI 2154 South EI Dorado Street, Stockton , California L, 1 1 .0. INTRODUCTION At the request of Mr. Minh Le , Advanced GeoEnvironmental , Inc. (AGE) has prepared this work plan addendum for the property located at 2154 South El Dorado Street, Stockton , California (site) . A monitoring well installation work plan (dated 09 October 2013) was previously approved for this site by the San Joaquin County Environmental Health Department ( EHD) by letter dated 28 October 2013.' Thereafter, shallow— c,,. ),I, groundwater monitoring wells MW-2 through MW-6 were installed at the site in tilQovember 2013 . Based on the results of the November 2013 well installations , the EHD has directed groundwater_ impact be assessed offsite towards the northeast, east, southeast, south , southwest and west. This work plan addendum details procedures for the installation of four off-site shallow groundwater monitoring wells to potentially assess I the hydrocarbon impact from leaking underground storage tanks (USTs) previously 1 located at the site . Additionally, AGE is proposing the collection of a deep grab .( y groundwater samples (�90 feet) at all four proposed well installation areas . - 1 This work plan has been prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the subsurface investigation of UST sites , and is in response to an EHD directive_ letter, dated 24 L. September 2014 (Appendix A) , f *r r� A site location map is included as Figure 1 . Historical soil boriribs ,, UST locations and I- current monitoring well locations are illustrated in Figur 2 ; proposed off-site groundwater monitoring well locations are depicted in Figure 3 . A table detailing the existing well construction details is included in Table 11 . Historical soil , groundwater elevation and groundwater analytical data are included in Tables 2 through 5 . r -� 2.0. SCOPE OF WORK - 1 The scope of the work includes the drilling and installation of four shallow-screened groundwater monitoring wells [between 20 and 40 feet below surface grade (bsg)] at the -- site to assess hydrocarbon impact to first-encountered groundwater resulting from previously installed leaking UST's . Prior to well installation , a soil boring will be advanced adjacent to the monitoring well pilot boring , to depths of approximately 90 feet bsg for the purpose of logging lithology and for collection of a deep grab groundwater sample. The scope of work will include the following tasks : i • Permitting and pre-field work activities ; Pilot drilling and soil sample collection :,�, C� _ Advanced GcoEnvironmcntal Inc.