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1 0 <br /> Mr. Michael Carr <br /> August 28, 1997 <br /> Page 2 of 4 <br /> • Preparation of a letter work plan for submittal to San Joaquin County Public <br /> Health Services for review and approval; <br /> • Collection of soil samples from five soil boreholes drilled near the hydraulic lifts <br /> at the Site; <br /> • Analysis of selected soil samples for TPH-HO and PCBs, depending on <br /> encountered concentrations of TPH-HO, if any; and <br /> • Preparation of this addendum to Versar's Limited Phase II Subsurface <br /> Investigation report, dated June 3, 1997. <br /> This scope of work was completed under the direction of Mr. Tim W. Berger, a State of <br /> California Registered Geologist (R.G. No. 5225). <br /> PRE-FIELD ACTIVITIES <br /> Prior to commencing intrusive work,Versar contacted Underground Services Alert (USA <br /> Dig#200505) to notify the utility owners in the Site vicinity of impending intrusive activities. <br /> i Mr. Vernon Eiarth, Associate Geologist with Versar, contacted the San Joaquin County <br /> Department of Environmental Health (SJCDEH) and the City of Escalon Building Department to <br /> obtain information on the type of hydraulic lifts installed at the Site and the date of installation. <br /> The SJCDEH and the City of Escalon do not permit hydraulic lifts, and had no information <br /> concerning hydraulic lift construction or date of installation. <br /> FIELD ACTIVITIES <br /> Versar contracted Vironex, Inc. (C57 License #705927) for the additional soil sampling <br /> activities conducted at the Site on July 30, 1997. Mr. Elarth directed drilling activities and <br /> collected the required samples. Versar collected soil samples at depths of 11.5 to 14.5 feet below <br /> ground surface (bgs) from five boreholes (Figure 1, Attachment A). Boreholes were located near <br /> the five operational underground hydraulic lifts located inside the Service Center building, and <br /> adjacent to Versar's borehole locations of June 12, 1997. <br /> Encountered soils consisted of silty sands to depth, and groundwater was not encountered <br /> during this field activity. Attachment B presents the borehole drilling logs. <br /> K PROlEMT LLER�SCA OM DSOIL.D" <br /> I <br /> t <br />