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Ms. Vicki McCartney January 22, 2004 Page 2 of 2 stored in DOT-approved, 55-gallon drums pending disposal. Borings will be backfilled to the ground surface with neat cement grout. One discrete groundwater le will be collect g► sample from each boring for laboratory analysis. The samples p will be collected by driving the sampler to the desired depth and exposing the screen to the formation. The i groundwater sample will be collected using a length of polytetrafloroethylene(PTFE) tubing equipped with a stainless steel bottom check valve. The tubing will be inserted into the probe rods and pushed to the bottom of the sampler at the desired depth., The groundwater sample will be brought.to the surface by gripping the top of the tubing and rapidly moving the tubing up and down creating a positive displacement effect, thereby forcing the water sample to the surface where itwill be collected directly into the sample I containers. All sampling and drilling equipment will be washed thoroughly with laboratory-grade detergent and water between uses to minimize the potential fore cross contamination. All field work will be conducted in accordance with the Site Safety Plan on file at EHD. Groundwater samples and selected soil samples from each boring will be submitted for analysis of total petroleum hydrocarbons as gasoline (TPHg) using EPA method 8015B; benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA method 8021B; and oxygenated gasoline additives, including the lead scavengers ethylene dibromide (EDB) and 1,2-dichloroethane (12-DCA) using EPA method 8260B. The detection limit for 1,2-DCA will be 0.5 micrograms per liter,'(pgll), which is equal to the maximum contaminant level for drinking water adopted by the California Department of Health Services. Selection of soil samples for laboratory analysis will be based on field evidence of petroleum hydrocarbon contamination such as discoloration, odors, and photoionization detector (PID) readings, as well as lithologic changes. If no evidence of contamination is noted in the field, samples from the capillary fringe and/or the bottom of the boring(s)will be submitted for analysis. A technical report describing field activities, analytical results, conclusions and recommendations will be submitted to Souza II LLC, EHD, and the California Regional Water Quality Control Board, Central Valley Region (RWQCB). The report will include a recalculation of the hydrocarbon mass with the inclusion of the results of soil samples collected from the proposed boring advanced through former Tank 4 location. A sample previously collected beneath the former Tank 4 location(TS2 T4-13E)contained 1700 milligrams per kilogram (mg/kg) TPHg. The report will also include a discussion of potential contaminant transport in shallow groundwater beneath the site. Please contact John Lane or Greg Stab] at your convenience;if you have any questions or comments regarding this workplan. Respectfully, ��ckSD GO,a Ground Zero Analysis,Inc. jOHN P. LANI" o Ili. John P.Lane N No. 6795 `} CA Registered Geologist No. 6795 • � 1E:: JPL GF C ��F cc: Mr. James Barton,RWQCB ` -Mr. Mike Souza, Souza II LLC w w - .mak x - -r F G:IGROUNDZE15ouza\Workplanslsouzawp0104.doc _ r U t s;