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• 0 <br />AdvancedGeo <br />Environmental <br />10 May 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 — Off-site Characterization <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 GeoEnvironmental, Inc. <br />(AGE) has prepared this Site Investigation Work Plan Addendum for the property located <br />at 17100 North Murphy Parkway, Lathrop, California (site). A location map of the site is <br />presented in Figure 1; and a site plan depicting site features is presented in Figure 2; no <br />structures are developed on the site and the proposed soil -waste removal location is <br />illustrated in Figure 2, along with additional soil excavations proposed. <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 />on the waste management 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 />PREIVIOUS WASTE DISPOSAL <br />During the investigation of the former PNA site, minor percentages of glass were <br />encountered in most the trenches. A set of trenches at the southwest boundary of the <br />property demonstrated a differing thickness (topology) of the buried waste. <br />Q,.,.,. <br />837 Shaw Road • Stockton, CA 95215 <br />Telephone (800) 511-9300 • Fax (888) 445-8786 <br />An Employee -Owned Company <br />