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Mr. Harlin Knoll <br /> June 22, 2000 <br /> Page 2 of 2 <br /> Selection of soil samples for laboratory analysis will be based on field evidence of gasoline hydrocarbon <br /> impaction, such as discoloration, odors, and FID readings, as well as lithologic changes. <br /> A groundwater sample will be collected from the boring using screen point groundwater sampler,which is driven <br /> to the desired sample depth with the Geoprobe. The screen point groundwater sampler consists of a stainless steel <br /> screen mesh housed in a perforated stainless steel sleeve. After the rods are driven to the desired depth <br /> (approximately 3 feet below the first encountered groundwater) the groundwater sampler is pulled up <br /> approximately two feet which,disengages the expendable stainless steel drive point. The screen assembly is then <br /> pushed into the borehole and water is allowed to enter the sampler and connected probe rods. The groundwater <br /> sample is collected using a length of 0.17 inner diameter Teflon tubing equipped with a stainless steel bottom <br /> check valve. The tubing is inserted into the probe rods and pushed to the bottom of the sampler to the desired <br /> depth. The groundwater sample is brought to the surface by gripping the top of the tubing and rapidly moving <br /> the tubing up and down creating a positive displacement pumping effect, thereby forcing the water sample to the <br /> surface where it is collected directly into the sample containers. The groundwater sample will be analyzed for <br /> TPHG, BTEX, and MTBE. <br /> Subsequent to sampling, the licensed drilling contractor will abandon the boring by grouting with neat <br /> cement or sand/cement slurry to the ground surface. All solid and liquid waste will be placed in <br /> appropriately labeled and sealed 55-gallon drums pending disposal. All sampling and drilling equipment <br /> will be washed thoroughly with laboratory-grade detergent and water between uses to minimize the <br /> potential of cross contamination. <br /> Ground Zero will schedule the field work upon approval of this workplan by PHS/EHD and the UST <br /> Cleanup Fund. Ground Zero will obtain a drilling permit from PHS/EHD prior to initiating any field work. <br /> All field work will be performed in accordance with Ground Zero's Quality Assurance/Quality Control <br /> (QA/QC) Plan and Site Safety Plan on file with PHS/EHD. <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or comments <br /> regarding this workplan. <br /> Sincerely, <br /> Ground Zero Analysis, Inc. <br /> John P. Lane <br /> CA Registered Geologist No. 6795 <br /> JPL <br /> Attachments: <br /> cc: Mr. Carl Knowles <br /> Mr. Patrick D. Riddle, Esq. <br /> Mr. Marty Hartzell, RWQCB <br /> G:\Data\GROLrNDZE\KNOWLES.HAMIREPORTS\WPaddO6OO.DOC <br />