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� STATE OF CALIFORNIA — ENVIRONMENTAL ATION AGENCY PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION ENYRrONHIENTAL HEALTH <br /> 3443 ROUTIER ROAD, SUITE A �� q�'T CFP <br /> SACRAMENTO, CA 95827-3098 SF ,VICE <br /> PHONE: (916) 255-3000 <br /> FAX: (916) 255-3015 93 JUN 21 PM 2: 32 <br /> 16 June 1993 <br /> Mr. Charles B. Kolesar <br /> Shell Oil Company <br /> P. O. Box 4848 <br /> 511 N. Brookhurst Street <br /> Anaheim, CA 92803 <br /> COMPLIANCE STATUS, SHELL OIL COMPANY, STOCKTON AND WEST <br /> SACRAMENTO FUEL TERMINALS, SAN JOAQUIN AND YOLO COUNTIES <br /> Stockton Facility - . 515 kA-VY <br /> Our review of the case file for your Stockton facility revealed that you have not installed the <br /> deep well we originally asked for in our 15 April 1992 letter. Your 23 September 1992 <br /> letter proposed installation of this deep well. Also, Plate 4 of Harding Lawson Associates' <br /> (HLA) 8 March 1993 proposed next phase of work includes the proposed locations of <br /> additional hydropunch samples, five shallow monitoring wells (MWs), and a deep MW. The <br /> narrative part of the proposed work discussed the hydropunch sampling and installation of the <br /> five shallow MWs, but not the deep well. In fact, a work plan and time schedule for work <br /> implementation have not been submitted for this well. <br /> Your 7 June 1993 letter adequately addresses our 10 May 1993 comments. <br /> West Sacramento Facility <br /> We have reviewed HLA's 4 May 1993 Offsite Well Installation Report and the 11 May 1993 <br /> Vadose Zone Soil Investigation Report. The first report concluded that there are no apparent <br /> petroleum hydrocarbon source areas at RMC Lonestar and the areal extent of the petroleum <br /> hydrocarbon contaminated ground water near MW 25, which is on the Lonestar property, has <br /> been defined. The second report stated that only low levels of total petroleum hydrocarbons <br /> (TPH) as diesel (13 - 200 mg/kg), TPH as gasoline (1.1 - 150 mg/kg), ethylbenzene (14 <br /> t4g/kg), and (79 µg/kg) were detected in the suspected source area within the tank farm. <br /> The results suggest a historical rather than a recent release. We concur with these <br /> conclusions and findings. <br />