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AdvancedGeo <br />Environmental <br />27 October 2017 <br />AGE Project No. 14-3154 <br />Mr. Robert McClellon <br />San Joaquin County Environmental Health Department <br />Local Enforcement Agency (LEA) <br />1868 East Hazelton Avenue <br />Stockton, CA 95205 <br />Subject: Site Investigation Work Plan Addendum <br />FORMER PILKINGTON NORTH AMERICA — LATHROP FACILITY <br />17100 Murphy Parkway, Lathrop, San Joaquin County, California <br />Solid Waste Information System (SWIS) number 39 -CR -0022 <br />(APN 198-120-09) <br />Dear Mr. McClellon: <br />At the request Mr. Dana G. Parry of R&B Louise et al, Advanced GeoEnviron mental, Inc. <br />(AGE) has prepared this Site Investigation Work Plan Addendum for the property located <br />at 17100 North Murphy Parkway, Lathrop, California (site). This work plan proposes a <br />scope of work to further characterize and determine the extent of glass waste in the <br />staging area (stabilized waste handling area) and in the footprint of the proposed building <br />at the property. A location map of the site is presented in Figure 1. A full site plan depicting <br />site features (no structures are developed on the site) and proposed trenches for waste <br />characterization are presented in Figure 2. The waste removal locations are illustrated in <br />Figures 2 and 3, along with additional excavations proposed for further sample and <br />provided for additional waste characterization (sampling of glass cullet). <br />PREVIOUS INVESTIGATION <br />Soil borings/trenches were advanced within an area of the property where former glass <br />debris and dust waste streams were historically managed/treated and stored. Trenching <br />in the glass waste handling area footprint and surrounding area was conducted to <br />evaluate the limits of buried waste and provide for additional soil sampling. None of the <br />detections of metals exceeded hazardous waste criteria and the additional analysis of the <br />soil for soluble metals concentrations reportedly present at the glass waste handling/ <br />burial areas have not been hazardous. <br />837 Shaw Road • Stockton, CA 95215 <br />Telephone (800) 511-9300 • Fax (888) 445-8786 <br />An Employee -Owners Company <br />