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Mr. Harlin Knoll <br /> June 11, 1998 <br /> Page 2 <br /> also be analyzed for gasoline oxygenate additives using EPA method 8260. Selection of soil samples for <br /> laboratory analysis will be based on field evidence of gasoline hydrocarbon impaction, such as <br /> discoloration, odors, and FID readings, as well as lithologic changes. <br /> One groundwater sample from each boring will also be collected and analyzed for TPHG and BTEX. The <br /> sample will be collected by driving the sampler to the desired depth and exposing the screen to the <br /> formation. The groundwater sample will be collected using a length of 0.17 inner diameter Teflon tubing, <br /> equipped with a stainless steel bottom check valve. The tubing will be inserted into the probe rods and pushed to <br /> the bottom of the sampler to the desired depth. The groundwater sample will be brought to the surface by <br /> gripping the top of the tubing and rapidly moving the tubing up and down creating a positive displacement effect, <br /> thereby forcing the water sample to the surface where it will be collected directly into the sample containers. <br /> All sampling and drilling equipment will be washed thoroughly with laboratory-grade detergent and water <br /> between uses to minimized the potential of cross contamination. <br /> It should be noted that push-point methodology has depth limitations that are a function of soil <br /> compactness/consistency. There are no guarantees that the push-point methodoloy can be successfully <br /> employed at this site. If soil conditions are not conducive to using push-point methodology based on the <br /> initial boring attempt, Ground Zero will reschedule the work using a drilling rig equipped with hollow stem <br /> augers. <br /> Ground Zero has tentatively scheduled the field work for June 29 and 30, 1998. <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or comments regarding <br /> this workplan. <br /> Sincerely, <br /> Ground Zero Analysis, Inc. <br /> � C <br /> John P. Lane <br /> Senior Geologist <br /> Gregory P. Stahl,RG 5023 <br /> CA Certified Hydrogeologist 264 <br /> JPL <br /> Attachments <br /> cc: Mr. Carl Knowles <br /> Mr. Patrick D. Riddle,Esq. <br /> Mr. Mark List, RWQCB <br /> groundze\knowles.ham\reports\wp0698.doc <br />