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Merico, Inc. <br />02320 0106 <br />May 29, 1991 <br />Page 2 <br />► Collect three background samples on-site from locations selected by Groundwater <br />Technology with the concurrence of Fish and Game. The samples will then be analyzed <br />for metals to provide a background level for metals in the area. <br />► Prepare a work pian to address soil remediation options for the site. <br />TASK 1: SOIL SAMPLING ANb LABORATORY ANALYSIS <br />Approximately 25-30 soil samples will be collected in the ditch and field using a two-man portable hydraulic <br />soil probe. Each sample will be collected in 1.5 -inches outside diameter (41D) by 6 -inches long brass tubes <br />at an approximate depth of 12 to 24 inches below grade. Following collection selected samples will be field <br />screened for volatile petroleum hydrocarbons using a portable photoionization detector (PID). The samples <br />will then be seated with foil, capped, labeled and placed on ice under chain -of -custody manifest for <br />immediate transfer to the on-site lab. The frequency of sampling, along with the locations and depth <br />intervals will vary in accordance with the results of each analysis. <br />Each sample will be analyzed Immediately by an on-site State certified mobile analytical laboratory. The <br />samples will be analyzed for TPH using Environmental Protection Agency (EPA) method 41 B.1. <br />Three samples will be collected at selected locations and submitted for analysis of the following metals: <br />cadmium (Cd), chromium (Cr), lead (Pb), zinc (Zn), and nickel (Ni). The samples will be analyzed by EPA <br />method SW -846 to determine background levels for metals at the site. <br />Sampling locations will be selected by Groundwater Technology in concurrence with on-site representatives <br />of Fish and Game. Because of mobile laboratory limitations, all metal analyses will be conducted at GTFL <br />laboratories in Concord, California. <br />TASK 2: SOIL REMEDIATION WORK PLAN PREPARATION <br />A detailed soil remediatiori work plan will be prepared using the data obtained from the .preliminary <br />assessment phase of the project. The work plan will summarize analytical results and present the best <br />option for remediation of any TPH soil contamination encountered above 100 parts per million (ppm) during <br />assessment. Upon completion of soil excavation, three additional samples will be collected from the areas <br />j JDEX GROUNDWATER <br />TrcHN01,UGY <br />