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rs <br /> 4aNa pro= MONO �i WN i <br /> : _ f. a <br /> OR <br /> Et <br /> Offi <br /> °W <br /> , <br /> 991 <br /> Addendum to Work Plan May 24, <br /> f ARCO Station No. 760, Lodi.California May <br /> 38048-6W <br /> bW <br /> To investigate the feasibility of using vapor extraction to remediate hydrocarbons in soil <br /> below the site,we will install three vaporextraction wells (shown on Plate P-2) and <br /> conduct -vapor-extraction test using the wells. Our procedures for well installation and <br /> on test are discussed under yield Methods. <br /> conducting a vaporextracti <br /> We will conduct the following tasks during the additional work: <br /> o Update the site safety plan to include the use of propane for the vapor- <br /> extraction test. <br /> a Obtain a drilling permit from the San Joaquin County Public Health <br /> Services, Environmental Health Division. <br /> o CotiMej.Underground Service Alert at least 48 hours before drilling to <br /> # identify public utility lines.at the site. <br /> =� o Observe drilling of three 10-incirdipmeter soil boring-. <br /> o Collect relatively undisturbed soil samples from each boring at 5-foot <br /> i other appropriate intervals from the ground surface to the total <br /> or <br /> intervals <br /> . boring depth and classify the samples according to the Unified Soil <br /> Classificetiun System. <br /> o Install three 4-inch-diameter vapor-extraction wel?s in the borings. <br /> o Submit selected soil samples to a laboratory approved by ARCO for <br /> analysis of total petroleum hydrocarbons as gasoline (TPHg) and benzene, <br /> toluene, ethylbenzene, and total xylene isomers (BTEX). <br /> o Collect four discrete soil samplas from the drill cuttings to be composi'•d <br /> into one sample and analyze for TPHg and BTEX. We will apprise ARCO <br /> of disposal options after receiving laboratory analyses• <br /> o Transport a portable vapor-extraction system to the site. <br /> y o <br /> operate the vaporextraction system as required to obtain vapor samples <br /> tand vacuum pressure and flow rate information. <br /> r <br /> �f Z <br /> A,0,011ed 000SYSAMS <br />