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� June 30, 1942 A AW Fire Engine Company No. 2, Stockton, California o Drill two 10;inch-diameter soil borings to 30 feet below grade and install 4-inch- diameter vapor-extraction wells The wells will be screened through the sand interval. o Drill one 12-inch-diameter soil boring to 10 feet below ground water (approximately 55 feet below grade) and convert the boring to a 6-inch-diameter ground-water pumping test well o Drill one 6-inch diameter soil boring to ground water and install a 1-inch diameter piezometer within a 10 foot radius of the pumping test. The piezometer will be used to monitor changes in the ground water level during the pumping test. o Collect relatively undisturbed soil samples at 5-foot intervals or lithological changes from the ground surface to the total depth of each boring o Develop, purge, and sample the ground-water pumping test well o Submit the water sample and a maximum of two soil samples per boring to a State- certified tate- certifed laboratory for analyses of total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX)using methods approved by the SJCPHS-EHD o Collect a composite sample from the drill cuttings for analyses of TPHg and BTEX to evaluate disposal options and apprise the City of Stockton of these options o Contract a licensed surveyor to survey the new and old wells with respect to mean sea level. o Transport a portable vapor-extraction system to the site o Operate the vapor-extraction system as required to obtain vapor samples and vacuum and flowrate information o Submit vapor samples to a State-certified laboratory for analyses of TPHg and BTEX o Interpret the data and develop remedial recommendations for soil. Results of the work will be presented in our status report for the quarter the work is conducted • M009-sw 3