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r Adward-Clycle Consultants Mr. Michael Trujillo Page 2 June 8, 1988 placed in drums , labeled, sealed and left onsite for subsequent disposal � pending the sample results. Following their completion, each well will be developed and sampled per state and EPA protocol . At a minimum, at least four casing volumes of water will be purged from each well by pumping or bailing. Samples will be taken with a clean Teflon bailer and handled under standard EPA Chain-of-Custody procedures. All development and purge water will be placed in drums , sealed, labeled and left onsite pending the results of the sample analyses. Soil and water samples will be submitted to the state-certified Woodward-Clyde Environmental Laboratory in Pleasant Hill , California for analyses. Selection of soil samples for analyses will be based primarily on headspace readings taken in the field and any visual or olfactory notations made during collection. In general , two to three samples from each boring will be selected for analyses. If headspace readings or field observations suggest that hydrocarbon contamination may be present, three samples will be selected for analyses; one from near the top of the potentially-contaminated zone, one from near the bottom, and one from below the zone to confirm the lower extent has been reached. Should the contaminated zone be extensive, then additional samples will be selected. Wherever possible, the sample closest to the air/water interface will be one of tho a selected. If no contamination is apparent , the sample closest to the water table and possibly one other s,ibmitted for analysis . All water samples will be analyzed. The above sample selection rationale deviates somewhat from that described in the RFP but was confirmed as acceptable and even preferable in a conversation with Mr. Peter D'Amico on June 7, 1988. The analytical parameters to be run are dependent on the sample type and level of contamination per the protocol described in the RFP. In general , all soil samples submitted for analysis will be analyzed for total petroleum hydrocarbons (TPH) by EPA Method 8015 modified. Those samples containing greater than 500 ppm TPN as well as the sample at the air/water interface will also be analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX) by Method 8020, total lead by Method 7421 , a h lene dibromide b EPA All water samples will be analyzed for TPH, BTEX and total lead by Methods 8015 , 602 and 7421 , respectively. Upon completion of the field activities and receipt of the written laboratory results , a report will be prepared and submitted to Thrifty Oil Co. in triplicate. The report will include a summary of the field activities conducted at the site, boring/well construction logs including headspace readings , the laboratory results and a site plan displaying the approximate boring locations and estimated groundwater gradient.