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16735 Van Korman,Suite 200 <br /> Irvine,CA 9 <br /> Tel:(949)660Do0 - <br /> FaX:(949)474-0940 <br /> March 9,2001 <br /> Ms.Margaret Lagorio <br /> Environmental Engineering&Consulting San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 017-20587-300/1 <br /> Subject:Addendum to Environmental Assessment Workplan for Pellegri Fart <br /> Dear Ms.Lagorio: <br /> As requested, below is the additional scope of work to be included as an addendum to the <br /> November 22, 2000 Environmental Assessment Workplan for Pellegri Farm (Site) located at <br /> 21606 EI Rancho Road,San Joaquin County,California. <br /> Scope of Work Addendum <br /> In addition to the activities described in the above-referenced Workplan, Brown and Caldwell <br /> will advance up to eight Geoprobe test holes to collect additional information for shallow soil <br /> and groundwater at the Site. These additional activities will include utility clearance and <br /> Geoprobe sampling as described in the following sections. <br /> Utility Grarmue <br /> Prior to conducting intrusive activities at the Site, Underground Service Alert (USA) will be <br /> notified of the proposed sampling and drilling activities and a dig alert number will be obtained. <br /> Since Geoprobe drilling methods will be used at the Site, which limits the use of a hand auger to <br /> clear utilities in the upper 4 to 5 feet, a geophysical survey will be conducted at the proposed <br /> eight soil boring locations. This survey will be used to clear utilities and locate other subsurface <br /> structures that may be present. Based on the layout of surrounding structtues and utilities and <br /> the results of the geophysical survey, the Geoprobe locations will be selected and clearly <br /> marked. <br /> The existing Site-specific Health and Safety Plan will be on-site during the fieldwork. <br /> Shallow Geoprobe test holes will be advanced to the water table [4 feet below ground surface <br /> (bgs)] with either a tract-mounted or truck-mounted Geoprobe rig (depending on availability). <br /> One soil and one grab groundwater sample will be collected from each probe hole using the <br /> dual tube sampling method. A soil sample will be collected between approximately 1-3 feet bgs, <br /> with a grab groundwater sample collected approximately 3 to 4 feet into the water table, or to <br /> refusal, which ever occurs first. The groundwater sample will be collected through the <br />