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07 May 2015 • <br /> AGE Project No. 15-3325 <br /> Page 2 of 4 <br /> naphthalene are typical constituents in fuel hydrocarbons and are likely related to <br /> former leaking underground storage tanks on or near the property. Naphthalene was <br /> detected in boring SV3-5 at a concentration of 1.2 ug/L, above regulatory screening <br /> levels for soil-vapor guidelines for residential properties. AGE recommended a soil- <br /> vapor intrusion study with both interior air (vapor) samples and soil-vapor samples. <br /> SCOPE OF WORK <br /> AGE proposes to advance a total of2-) soil borings along the northwestern and <br /> southwestern corners of the property, and within the apartment complex. Borings will be <br /> advanced to depths of 5 feet below surface grade (bsg) for collection of soil-vapor <br /> samples. Select soil borings will be advanced to 10 feet near the previous location of <br /> SV3 and along the western property boundary. Proposed soil boring locations are <br /> depicted in Figure 2. <br /> Borings will be advanced using either a mechanical hand-held hammer (rotohammer) or <br /> GeoProbeO. <br /> Soil-vapor samples will be submitted to a California Department of Public Health <br /> (CDPH)-Certified laboratory and samples will be selectively analyzed for: <br /> • Volatile organic compounds (VOCs) in accordance with EPA-method 82608. <br /> Upon completion of the field work and receipt of laboratory analytical data, a brief report <br /> will be prepared. The report will be reviewed and signed by a California Professional <br /> Geologist and a Certified Industrial Hygienist. <br /> PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable drilling permits will be obtained from the SJCEHD and a site-specific Health <br /> and Safety Plan will be prepared. Prior to mobilization, each soil boring location will be <br /> clearly marked and a utility clearance obtained through Underground Service Alert. The <br /> SJCEHD will be contacted a minimum of 72 hours prior to conducting investigation <br /> activities to arrange for inspection. <br /> FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative working under the <br /> supervision of a California Professional Geologist. Procedures for sample collection and <br /> analysis, equipment decontamination and sample handling are presented below. <br /> Advanced GeoEnvironmental,Inc. <br />