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r <br /> INTERIM REMEDIAL ACTION PLAN <br /> r4491 WEST DURHAM FERRY ROAD <br /> iTRACY, CALIFORNIA <br /> DELTA PROJECT NO. 40-91-732 <br /> 1.0 INTRODUCTION <br /> Delta Environmental Consultants, Inc (Delta), has been authorized by Ms Stella Ruiz, the owner of the <br /> property located at 4491 West Durham Ferry Road, Tracy, California (Figure 1), to prepare this Interim <br /> Remedial Action Plan <br /> 1 <br /> .1 Scope of Work <br /> The purpose of this Interim Remedial Action Plan is to propose a remedial action alternative that will <br /> effectively remove hydrocarbons from the soils at the subject site In addition, the plan recommends <br /> further characterization of the site for the purpose of completing a Problem Assessment Report which will <br /> aid in the final remedial system design <br /> 1 <br /> 1.2 History of Work <br /> The following is a history of activities that Delta preformed <br /> o Drilled two 8-inch--diameter soil borings to depths of approximately 25 feet and converted <br /> them to 2-inti-diameter monitoring wells MW-2 and MW-3 on August 28, 1991 <br /> re Collected soil samples at 5-foot intervals with a modified California sampler for <br /> classification according to the Unified Soil Classification System (USCS) <br /> 1 <br /> A Screened recovered soil samples with a portable photoionization detector (PID) for the <br /> rpresence of total organic vapors <br /> ra Selected and submitted two soil samples to a state-certified laboratory for chemical analysis <br /> using U S Environmental Protection Agency (EPA) Method 8260 modified for total <br /> petroleum hydrocarbons (TPH) as gasoline and diesel, and benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX) with a 10-wonting-day turnaround <br /> e Stockpiled the soil cuttings from drilling on visquine and stored on site <br /> RPT045 TA <br /> 1 <br />