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SECOR Mr. Mike Infurna, -._ July 15, 2005 Page 2 PROPOSED MODIFIED SCOPE OF WORK The proposed scope of work consists of the installation of well MW-22 at the alternative location proposed on Figure 1. As proposed in the initial work plan and work plan addendum, the well will be completed at a depth of 22 feet bgs. A summary of the planned field work is presented below. Field and laboratory procedures for the activities described below are provided in Attachment 1. • Health and Safety Plan (HASP). As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR will update the current site-specific HASP prior to the commencement of fieldwork. The HASP will.be reviewed by the field staff and contractors before beginning field operations at the site. • Permitting. SECOR has obtained a well construction permit from the SJCEHD. ConocoPhillips has obtained a right-of-entry agreement with the current owner of the Holiday Inn property (Indraprat Enterprises), who will be contacted prior to the beginning of field work activities. • Borehole Clearance Activities. The location of the boring will be marked, and Underground Service Alert (USA) will be notified at least 48 hours prior to drilling. Prior to the initiation of machine drilling, the proposed boring location will be resurveyed by a private utility locator to reconfirm the location of the nearby utilities. The borehole will be hand- augered to a depth of 5 feet bgs to clear the location of utilities in the area of the proposed boring location. • Soil Sampling and Analysis. The soil boring will be drilled by advancing eight-inch diameter augers to the proposed depth of 22 feet bgs. Soil samples for lithological description and chemical analysis will be collected at approximate 5-foot intervals. At least one soil sample from the boring will be selected for chemical analysis, and will be sent under chain-of-custody documentation to Severn Trent Laboratories, Inc. (STL). The soil sample(s) will be analyzed for the presence of gasoline range organics (GRO); benzene, toluene, ethylbenzene, xylenes (BTEX); and fuel oxygenates methyl tertiary butyl ether (MtBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), ethyl tertiary butyl ether (EtBE), tertiary butyl alcohol (TBA), ethanol; and lead scavengers 1,2- dichloroethane (1,2-DCA) and ethylene dibromide (EDB) by Environmental Protection Agency (EPA) Method 8260B. --i 11195 Second Addendum to 9-04 WP.doc SECOR lntemationallncorporaied