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Site Characterization Work Plan Second Addendum <br /> 2 November 2018 <br /> Page 2 <br /> We are also proposing to install one additional borehole/monitoring well between the Site and <br /> LWD-9, at monitoring well cluster PW2. Currently, the deepest monitoring well at the PW2 well <br /> cluster is screened to 152 feet bgs.The Corcoran Clay was encountered at depths between 255 and <br /> 260 feet bgs at Locations 2, and 7. This borehole will be drilled to the depth of the Corcoran Clay <br /> at the PW2 well cluster and a new monitoring well will be installed in the deepest sand interval <br /> overlying the Corcoran Clay. <br /> The drilling, sampling and well construction work at PW2, PW35 and PW36 will be conducted in <br /> accordance with the Work Plan and the well construction details modifications described in the <br /> first Addendum to the Work Plan. Fieldwork at these locations will not commence without <br /> CVRWQCB approval of this Second Addendum, clearance of underground utilities, procurement <br /> of access agreements with the property owners,and procurement of well installation permits from <br /> the County. Please provide us with your approval of the three additional proposed boring/well <br /> locations.If you have any questions,please contact Nicole Gotberg at:NGotberg@Geosyntec.com <br /> or(916) 637-8347. <br />