Laserfiche WebLink
Ell�yt® <br />' ENSR International <br /> 10411 Ofd Placerville Road <br /> •� !'rte�, Suite 210 <br /> December 2, 2004 <br /> ID- 1 <br /> ���� 1 Sacramento,{95 <br /> 16)362 7100 <br /> DEC 6 2004 FAX (916)362-8100 <br />' www ensr com <br /> Mr James L Barton t=1� IrI <br /> PET MISERViCESi <br /> Regional Water Quality Control Board <br />' Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670-6114 <br /> 1 RE: Remedial System Evaluation 1 Comparative Analysis of Changes in Contaminant <br /> Concentrations, Distribution and Mass within the Aquifer Beneath the Site <br /> 1 Former Unocal Service Station No 5098 <br /> 5400 and 5606 Pacific Avenue, Stockton, California <br /> Dear Mr Barton <br /> ENSR Corporation (ENSR) has been authorized by Union Oil Company of California (Unocal), <br /> to perform a Remedial System Evaluation (RSE) in conjunction with the November 2, 2004 <br /> Work Plan to the Regional Water Quality Control Board, Central Valley Region (RWQCB) This <br /> report presents the results of that evaluation <br /> lie Cleanup and Abatement Order (CAO) No 5-00-707 dated September 8, 2000 named Wards <br /> and Unocal jointly responsible for actions necessary to abate the effects of contamination in the <br /> vicinity of the sites In August 2000 Wards and Unocal executed an agreement for Coordinated <br /> Corrective Action for Underground Storage Tank (UST) Fund Claim No 1760 and UST Fund <br /> Claim No 6864 On November 2, 2001, Unocal was named as the Appointed Representative for <br /> the PACIFIC/ROBINHOOD COMMINGLED PLUME <br /> This report was written In accordance with the guidelines and formats suggested by the United <br /> States Army Corps of Engineers (USACOE) <br /> SITE LOCATION CHARACTERISTICS & HISTORY <br /> Site Location & Characteristics <br /> The former site facilities were located at the former Montgomery Ward, LLC (Wards) site located <br /> at 5400 Pacific Avenue and the former Unocal site located at 5606 Pacific Avenue, Stockton, <br /> California (Figure 1) The site is located in a commercial business and retail shonoing district <br /> Tne locations of former and current site features are illustrated on Figure 2 <br /> Site History <br /> Wards formerly operated an auto service center at 5400 Pacific Avenue, Stockton, California <br /> Between 1986 and 1988, Wards removed one waste oil UST, four bulk oil USTs, and two gasoline <br /> USTs from the site Between 1992 and 1999, numerous soil and groundwater investigations of <br /> the Wards site were conducted and a remedial system (air sparging with vapor extraction) was <br /> 11DcsacramerntolproiecW\Pmjects10694015098 293ftallReports15098 RSE Results Report doc <br /> — ya?rr n i xcp, r—i,, Enw n,1m4Ilr&r Snrviaec <br />