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0 r -f-T7-X0� -�� <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address:.bttpJ/www.swreb.ca.gov/rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 11 January 2002 R !,~;,Ct E IVE D <br /> Mr.Ron Neil JAN 14 2002 <br /> Rexal Canada,Incorporated <br /> 505 Locke, Suite 200 <br /> St. Laurent,Quebec H4T 1X7 <br /> WOR%PLANAPPROVAL <br /> FORMER P.E. O'HAIR, 1102 SOUTHAURORA STREET,STOC%TON,SAN JOA QUIN COUNTY <br /> I reviewed the 3 January 2002 Workplan for Additional Subsurface Investigation(Workplan)submitted on behalf <br /> of Rexal Canada,Incorporated by Apex Environmental Incorporated(Apex). Apex proposes to complete five <br /> geoprobe borings to approximately 14 feet, and collect one soil sample and one groundwater sample from each <br /> boring for analyses of petroleum hydrocarbons and oxygenates. <br /> Apex estimates the depth to water at 12 feet. I reviewed the site files for two sites within one half mile of the <br /> subject site, and identified the current depth to water at these sites is 30 to 35 feet. General lithology consists of <br /> mixed sands,silts, and clays,and you may experience difficulty completing geoprobe borings to 35 feet or <br /> greater. Therefore,you should be prepared to collect soil and groundwater samples from this site at potentially <br /> greater depths than 14 feet. <br /> The Workplan is approved with the following comments and additions: <br /> • Starting at 10 feet, collect soil samples at five foot intervals or at changes in lithology to first encountered <br /> groundwater. Analyze representative soil samples to show two consecutive non-detect samples below any <br /> identified soil contamination. <br /> • Analyze soil and groundwater samples for TPHg,BTEX,MtBE,TBA,D1PE,TAME,ETBE, <br /> 1,2-dichloroethane,and ethylene dibromide. Some laboratories can run a complete suite of petroleum <br /> constituents and fuel additives by EPA Method 8260B,thereby saving considerable cost. <br /> • Following sample collection and analysis,submit a Preliminary Investigation and Evaluation Report <br /> (PIER)as described in the enclosed Appendix A to the Tri-Regional Staff Recommendations for <br /> Preliminary Investigation and Evaluation of Underground Storage Tank Sites. Within the PIER,include <br /> a scaled site plan to show the former UST locations and soil borings. <br /> All drilling permits must be secured through the San Joaquin County Environmental Health Department(County) <br /> prior to any site work Contact Mr.Mike Infuma at(209)468-3454 for County drilling permits. <br /> California Environmental Protection Agency <br /> Qd Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at httpl/wwwswrcb.c&govhwgcb5 <br />