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Krarlan & ASSOCIATES, INC. <br />GEOTECHNICAL ENGINEERING • ENVIRONMENTAL ENGINEERING <br />CONSTRUCTION TESTING & INSPECTION <br />May 20, 2014 Project No. 014-13157 <br />Mr. Rod A. Attebery, Attorney at Law <br />Neumiller & Beardslee <br />P.O. Box 20 <br />Stockton, California 95201-3020 <br />RE: Report of Findings <br />Phase II Limited Excavation Activities <br />Wilson Way Property <br />3931 —4001 North Wilson Way <br />APNs 132-020-08 and -10 <br />Stockton, California 95205 <br />Dear Mr. Attebery: <br />Pursuant to your request, Krazan & Associates, Inc. (Krazan) conducted Phase II Limited Excavation <br />Activities (LEA) at the referenced property (see Figure 1 for Vicinity Map). The LEA was based strictly <br />upon the findings provided in Krazan's October 31, 2013 Revised Phase II Limited Subsurface Assessment <br />prepared for Neumiller & Beardslee and discussions with the client. The work was conducted under a <br />Local Voluntary Cleanup Program, Remedial Action Agreement dated April 25, 2014 with the San Joaquin <br />County Environmental Health Department (SJCEHD). The Remedial Action Agreement is included in <br />Appendix A. <br />BACKGROUND <br />Based on the findings in the field, and the laboratory analytical reports for the soil samples collected and <br />analyzed during the October 31, 2013 Phase II LSA, no evidence of known significant impact (based on a <br />comparison with established regulatory screening levels) of the constituents of concern (COCs) investigated <br />in the areas assessed was identified with respect to subsurface soil associated with the subject site with the <br />exception of metals (arsenic in composite sample S10, S11, S12, S13) and cobalt (all samples) and total <br />petroleum hydrocarbons (TPH) as diesel (TPH-d) and TPH as motor oil (TPH-mo) in composite sample <br />S26, S27, S28, S29. Although the concentrations of arsenic and cobalt exceeded the ESLs and USEPA <br />RSLs, the concentrations are within background levels' for naturally occurring arsenic and cobalt (28 mg/kg <br />and 22 mg/kg, respectively) in soil in California. <br />Formaldehyde does not appear to be present at the site over a large area as evidenced by the fact that only <br />two (2) samples (B1 at 10 feet bgs and composite sample S26, S27, S28, and S29) contained concentrations <br />of formaldehyde above the MDL of 0.60 mg/kg. Formaldehyde is not usually present in <br />1 Diamond, David, et. Al. 2009, Analysis of Background Distribution of Metals in Soil at Lawrence Berkeley <br />National Laboratory, June 2002, Revised April 2009. <br />215 W. Dakota Avenue • Clovis, California 93612 • Ph: (559) 348-2200 • Fax: (559) 348-2201 <br />With Offices Serving the Western United States <br />Phase II LSA - 014-13157 Excavation Report FINALdocx