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w <br /> ME <br /> x <br /> Work Plan Mav 17, 1991 <br /> ARCO Service Station No.2130, Stockton, California AGS k0034W <br /> o Observe drilling of three 10-inch-diameter soil borings to approximately 25 <br /> feet north of the station building and installation of three vapor-extraction <br /> wells in the borings. The screened interval of the wells will extend 10 to <br /> 25 feet below grade if hydrocarbons are not detected using the PID in the <br /> borings around the existing tank cavity. If hydrocarbons are detected using <br /> the PID below 2S feet, the screened interval and depth of the vapor wells <br /> will be adjusted accordingly. <br /> o Collect relatively undisturbed soil samples from each boring at Hoot <br /> intervals or other appropriate intervals from the ground surface to the total <br /> boring depth and classify the samples according to the Unified Soil <br /> Classification System. ✓ / /lam/,J� Tom'_` <br /> o Submit soil samples to a laboratory approved by.ARCO for analysis of <br /> total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, <br /> ethylbenzene, and total xylene isomers (BTEX). <br /> o Collect four discrete soil samples from the drill cuttings to be composited <br /> into one sample. We will apprise pprise ARCO of disposal options after receiving <br /> laboratory analyses. <br /> o Transport a portable vapor-extraction system to the site. <br /> o Operate the vaporextraction system as required to obtain vapor samples <br /> f and vacuum pressure and flow rate information. <br /> o Submit vapor samples to a laboratory approved by ARCO for analyses of <br /> TPHg and ETEX. <br /> o Prepare a report summarizing our methods, interpretations, conclusions <br /> and make recommendations including the feasibility of conducting a VET <br /> at the site. <br /> .4P,v/led Ceo�ys�`ems <br />