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f - T7 <br /> 3164 Gold Camp Drive <br /> Suite 200 <br /> Delta <br /> Rancho Cordova,CA 95679=E021'r<;s1 <br /> fi U.S.A. / <br /> ��. Environmental 9161638-2085 <br /> Consultants,Inc. FAX:916/638-8385 f <br /> J <br /> `1 <br /> May 1,2000 <br /> Ron Rowe <br /> Ei ' <br /> San Joaquin County,Public Health Services !" <br /> i Environmental Health Division <br /> 304 East Weber Ave., Third Floor <br /> '! Stockton, CA 95202 <br /> Subject: Workplan Addendum t <br /> ARCO Station 5469 ' <br /> 130 South Wilson Way <br /> Stockton, California <br /> Dear Mr.Rowe: �f <br /> i 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 /> 'i 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 (PHSIEHD) 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 /> F <br /> a€ 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 be located in the north-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 /> remaining 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 encountered, and will target preferential flow paths. Soil <br /> sampling and well installation procedures will adhere to those originally presented in the workplan. <br /> The initial 5 feet of each boring 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 /> E equipped with three precleaned brass tubes. The ends of the bottom-most, intact tube from each sample <br /> interval will be lined with Teflon TM sheets,capped,and sealed. Each sample will then be labeled,placed <br /> Providing a Competitive Edge <br />