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vi �+ i cii�alJ 2fiC j DOU 04e 1IbUj may-2-UQ 2:19PM; Page 2/4 <br /> 4 <br /> � 3164 Gold Camp Drive <br /> ■, mta <br /> Suite 240 <br /> Rancho Gon7ova,CA 95670-8021 <br /> / Erwtrnnmsrets�l U.S.A_ <br /> Consunaws,11ne. 9161638-2085 <br /> FAX-9161638-8385 <br /> May 1,2000 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave. Third Floor <br /> Ron Rowe P. O. Box 388, Stockton CA 95201-0388 <br /> San Joaquin Counl.y, Public Health Services Approved [' <br /> Environmental Health Division Denied ❑ <br /> 304 East Weber Ave,,Third Floor i,,� Conditions TkzASe 50WKA.kC <br /> Stockton,CA 95202 A ?LAU1,nonA_ ,,6-15 • !R� <br /> Date 5• -ZAa,0 by a.,,3 t <br /> Subject: Workplan Addendum <br /> ARCO Station 5469 <br /> 130 South Wilson Way <br /> Stockton, California <br /> Dear Mr.Rowo: <br /> On behalf of ARCO Products Company, Delta Environmental Consultants, Inc. (Delta) is submitting <br /> this addendum to the Preliminary Site Characterization Workplan, dated February 28, 2000 and <br /> submitted by IT Corporation, for the ARCO Facility located at 130 South Wilson Way, Stockton, <br /> California. This addendum addresses those conditions outlined by San Joaquin County, Public <br /> Health Services, Environmental Health Division (PI-IS/EHD) in their Workplan Approval Letter, <br /> dated April, 4, 2000. We have also included a schedule for performing the field activities and <br /> reporting the findings. <br /> Additional Groundwater Monitoring Wells <br /> Three additional 4-inch-diameter groundwater monitoring wells will be installed onsite. A total of six <br /> wells, including the three well identified in the workplan, will now be installed. One of the three <br /> additional wells will be located due east of the existing UST complex, near the station building. A <br /> second well will bo located in the Horth-west corner of the property, and the third well will be placed <br /> north-east of proposed monitoring well MW-1 (as presented in Figure 2 of the workplan)_ The <br /> remain* wells will be located as presented in the workplan. Three of the six borings will have <br /> samples collected continuously. In the remaining three borings, samples will be collected every five <br /> feet. The wells will be installed to a depth of approximately 60 feet bgs,though the actual depth may be <br /> modified in the field based on subsurface conditions. The construction of the screen interval of each <br /> well will be based on subsurface material onoountered, and will target preferential flow paths. Soil <br /> sampling and well installation procedures will adhere to those originally presentxd in dhe workplan. <br /> The initial 5 feet ofeaeh tx-iring will be advanced with a hand auger and/or posthole digger to reduce the <br /> possibility of damaging underground utilities. Soil samples for laboratory analysis will be collected at <br /> 5-foot intervals during the advancement of the borings using a California-type, split-spoon sampler <br /> equipped with three precleaned brass tubes. The cods of the bottom-most,intact tube from each sample <br /> interval will be lined with Teflon'm sheots,capped,and sealed. Each sample will then be]abated,placed <br /> Providing a Competltive Edge <br />