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° <br /> A.Tomhert&Son Inc.Mable Equipment Shop 103 N.'E'St.Stockton,CA. <br /> Remedial Action Plan March. 1994 <br /> 1.0 Introduction <br /> Purpose <br /> The purpose of the soil vapor extraction (SVE) pilot test was to collect soil samples for <br /> chemical analysis, and to characterize vacuum-induced air flow in the subsurface. Three <br /> parameters of airflow are monitored in addition to air sample analysis. These parameters <br /> are airflow in cubic feet per minute, or CFM, at the blower, the vacuum required to <br /> generate the flow and the radius of influence of the vacuum test as measured in outlying <br /> well points. These parameters are used to evaluate the feasibility of SVE for the <br /> remediation of petroleum hydrocarbons in soil and groundwater beneath the site. This <br /> data was collected during and subsequent to the construction of monitoring well MW--14 <br /> in accordance with SCR's Pilot Soil Vapor Extraction Test Work Plan dated February 8, <br /> 1994. The site and site vicinity are illustrated in Figures 1 and 2. <br />° 1_2 Scope <br /> The scope of work was completed in accordance with SCR's standard procedures, <br /> included as Appendix A, and included the following: <br /> • Preparation of a work plan, design and location of SVE/monitoring well MW-14, and <br /> securing the required well construction permit. <br /> • Advancing a 10--inch diameter soil boring on March 10, 1994, and collecting seven <br /> soil samples from the boring at five--foot intervals from 40 to 70 feet below ground <br /> surface (bgs). <br /> a <br /> • Constructing and developing 4-inch diameter groundwater monitoring well MW-14 <br /> suitable for soil vapor extraction of petroleum hydrocarbons from product-bearing <br /> zones encountered by the soil boring. <br /> • Chemical analysis of seven soil samples collected from the soil boring for total <br />° petroleum hydrocarbons (TPH) as gasoline and benzene, toluene, ethylbenzene <br /> and xylenes (BTEX) by EPA methods 8015m18020. <br /> • Completion of an SVE pilot test on the newly constructed MW-14 and measuring <br /> the radius of influence from an induced vacuum on surrounding wells, measurement <br />° and calculation of air flow generated by the test, and collection of an air sample for <br /> chemical analysis of TPH gasoline and BTEX. <br /> • Evaluation of the pilot test data and development of site-specific SVE remediation <br /> system requirements. <br />° <br /> 2 <br /> 1 <br />