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WORK PLAN - LODI <br /> Lodi, California <br /> Delta Project No. 40-90-838 <br /> Page 2 <br /> Purpose <br /> The purpose of the site investigation is to determine the following: <br /> • Whether petroleum constituents are present in the soil beneath the site. <br /> Scope of Work <br /> Delta proposes to perform the following work: <br /> • Drill three soil borings to a maximum of 40 feet below land surface or to the ground water <br /> table,whichever is encountered first. <br /> • Collect soil samples at 5-foot intervals from each soil boring with a modified California <br /> sampler and classify soils according to the Unified Soil Classification System (USCS). <br /> • Screen the recovered soil samples with a photoionization detector (PID) for the presence <br /> of gasoline constituents. <br /> • Submit selected soil samples to a California-certified analytical laboratory for analyses of <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX), by U.S. Environmental Protection <br /> Agency (EPA) Method 8020 and total petroleum hydrocarbons (TPH) as gasoline by EPA <br /> Method 8015, modified. <br /> Soil Boring Locations <br /> Three soil borings will be drilled using hollow stem augers to a maximum depth of 40 feet below land <br /> surface or to ground water,whichever is encountered first. The soil borings will be drilled using 7-inch <br /> outer diameter hollow stem augers. Split spoon samples will be collected at 5-foot intervals. Sampling <br /> procedures are described in Appendix A of this work plan. Soil boring locations are shown in Figure <br /> 2. <br /> Grouting Procedures <br /> Each soil boring will be grouted in accordance with the San Joaquin County Public Health Services <br /> guidelines. A cement sand slurry consisting of Portland Cement, clean 20-40 grade sand, and potable <br /> water in the proportions of 5.2 gallons of water and 85 pounds of sand per 94-pound sack of cement will <br /> be used to grout the boreholes. Placement of the grout seal will be performed by pumping the grout <br /> through the hollow stem augers. Once the hollow stem augers are filled with grout to ground surface, <br /> a 5-foot section of auger will be removed. The grout will be re-established by pumping additional grout <br /> into the hollow stem augers. This process will be repeated until the lead auger has been removed. <br />