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_ — . <br /> s <br /> May 24, 1991 <br /> Addendum to Work Plan AGS 30008-4W <br /> ARCO Station No. 2076, Lodi, California <br /> We will conduct the Following tasks during the additional work: <br /> a Update the site safety pian to include the usc; of propane for the vaper- <br /> extraction test. <br /> o Obtain a drilling permit from the S4a Joaquin County Public Health <br /> Services, Environmental Health Division. <br /> 9 o Contact Underground Service Alert at least 48 hours before drilling to <br /> identify p,!hlic utility lines at the site. <br /> a Observe drilling of three I0-inch-diameter soil borings. <br /> o Collect relatively undisturbed soil samples from each boring at S-foot <br /> Intervals or other appropriate irate l from <br /> ding ground <br /> e surfacenified t lthe tncal <br /> boring depth and classify the samples o <br /> Classification Systein. <br /> o Install three 4-inch-diameter vapor-extra ct;on wells in the borings. <br /> o Submit selected soil samples to a laboratory approved by ARCO for <br /> analysis of total petroleurr. hydrocarbons as gasolene (TPHg) and benzene, <br /> toluene, ethylbenzene, and total xylene isomers (BTEX). <br /> o Collect four discrete soil samples from the drill cuttings to be composited <br /> into one sample and analyze for TPfig and BTEX. We will apprise ARCO <br /> of disposal options after receiving laboratory analyses. <br /> lo Transport a portable vapor-extraction system to the site. <br /> a Operate the vapor-exiraction system as required to obtain vapor samples <br /> and vacuum pressure and flow rate information. <br /> O Submit vapor samples to a laboratory approved by ARCO for analyses of <br /> TPHg and BTEX. <br /> o Prepare a report summarizing our methods, interpretations, and <br /> conclusions regarding the feasibility of using vapor extraction to remove <br /> hvo'rocarboris form-soil underlying tile site: <br /> Z <br /> ysteons - <br /> APPIZ90 GeoS <br />