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California Regional Water Quality Control Board " � <br /> Central Valle Region <br /> Robert Schneider Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.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 May 2001 <br /> J <br /> Ms. Margaret Russell <br /> c/o Mr. John Welch <br /> P.O. Box 690757 <br /> Stockton, CA 95269 <br /> WORK PLAN APPROVAL, FORMER KARLSON TRUCKING, MANTECA, <br /> SAN JOAQUIN COUNTY <br /> We have reviewed Geo-Phase Environmental's 2 March 2001 Report, Site Characterization-Third Event <br /> for the former Karlson Trucking(KT) site in Manteca. The report presents the results of soil and <br /> groundwater sampling at two locations downgradient of monitoring well (MW) 6 to determine the extent <br /> of total petroleum hydrocarbons as (TPHd)pollution in groundwater beneath the site. Our comments on <br /> the site characterization report are presented below. <br /> The report shows that soil contained nondetectable (ND) levels of TPHd at the two sample locations, <br /> groundwater at 13, 17, and 21 feet below ground surface contained TPHd at 330,ND, and 60 µg/1, <br /> respectively, in SB-13; and 597, 277, and ND gg/l, respectively, in SB-14. The report concludes that the <br /> TPHd in groundwater appeared to be non-petroleum organic materials. The report recommends no <br /> additional characterization at the site,performing a risk assessment, and conducting groundwater <br /> sampling. <br /> We concur with the report's findings and recommendations. In addition to the tasks proposed,we <br /> request that KT collect all the necessary information specified in Appendix B [No Further Action(NFA) <br /> Requests] of the Tri-Regional Board Staff Recommendations for Preliminary Investigation and <br /> Evaluation of Underground Tank Sites in anticipation of submitting a NFA request for the site. By <br /> 8 June 2001,please submit a schedule to complete the risk assessment, conduct groundwater sampling, <br /> and prepare a NFA request in accordance with Appendix B. <br /> If you have any questions, you may call me at (916) 255-3398 or e-mail at isorenp@rb5s.swrcb.ca.gov. <br /> LtvjX <br /> *)y- LIP <br /> S. ISORENA <br /> Associate Engineer <br /> cc: Ms. Margaret Lagorio, San Joaquin County Public Health Services, Stockton <br /> Mr. Stephen M. Lankford, Geo-Phase Environmental Inc., Modesto <br /> California Environmental Protection Agency <br /> �a 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 do to reduce demand and cut your energy costs,see our Website at http://www.swrcb.ca.gov/rwgcb5. <br />