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California Rq&Wal Water Quality C7ftrol Board <br /> Central Valley Region <br /> a Steven T.Butler,Chair _ s <br /> Sacramento Ma' ffee <br /> Winston 11. Hickox Internet Addrus: http://www.s .c �+�e 65 p OJ Gray Davis <br /> Secrerarfor 3443 Routier Road,Suite A,Sacnimen i omia'95827-bl1U3 1 Governor <br /> Environmental Phone(916)255-3000•FAX(916)255-3015 <br /> Protection <br /> 13 March 2000 <br /> Ms. Jill Jefferson <br /> Kinder Morgan Energy Partners, L.P. <br /> 1100 Town and Country Road <br /> Orange, CA. 92868 <br /> WORK PLAN FOR FURTHER INVESTIGATION: SFPP, L.P. STOCKTON TERMINAL,2947 <br /> NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> 1 have reviewed the Work Plan for Further Investigation dated 29 February 2000, which was prepared <br /> by LFR Levine-Fricke (LFR) on behalf of Kinder Morgan Energy Partners, L.P. and SFPP., L.P. <br /> Thank you for this submittal. The Work Plan is acceptable, subject to the comments below. <br /> Present Site Conditions: Quarterly monitoring for the past several years and a more recent(September <br /> 1998) due diligence investigation at the site have revealed that A zone soil and groundwater are <br /> impacted by petroleum hydrocarbons. The Work Plan states that groundwater impacts are "primarily" <br /> limited to the A zone and that the B zone has "only law concentrations of hydrocarbons" (less than 5 <br /> µg/L) in well MW-7 and no detections in MW-8 in fourth quarter 1999 sampling. However,the fourth <br /> quarter monitoring report actually shows 2.5 Rg/L benzene and 0.9 µg/L toluene in MW-7,.as well as 5 <br /> µg/L MtBE. A-zone impacts are more serious than the Work Plan's narrative indicates: the fourth <br /> quarter 1999 monitoring report shows up to 6,600 Rg/L benzene and 260 µg/L MtBE (using Method <br /> 8260b) in MW-1,the most impacted well. MtBE concentrations in MW-1 fluctuate,but have been <br /> reported up to 400 Rg/L. Of greater concern,however, are the results of the due diligence study. This <br /> study additionally reported both MtBE at 2.3 Rg/L and tertiary-butyl ether(TBA) at 400 Rg/L in well <br /> MW-7,using Method 8260b. TBA can be a degradation product of MtBE as well as a primary additive <br /> used as an oxygenate. This was the highest concentration of TBA found during the due diligence study. <br /> TBA has not previously been reported at this facility;but the reported detection limit in July 1999 for <br /> this analyte was significantly elevated (1000 µg/L) in MW-1. <br /> The due diligence study included ten direct push boreholes advanced to depths of approximately five <br /> feet below grade in various locations around the tank farm. Soil and groundwater grab samples were <br /> collected. The analytical results from soil samples found up to 1,000 µg/Kg benzene in borehole B4, <br /> near the additive tanks in the tank farm, and up to 35,000 µg/L benzene in groundwater grab samples <br /> from B9, in the central part of the tank farm on the northeast side. Borehole B9 also had the highest <br /> groundwater concentrations of toluene, ethylbenzene, and xylenes, all of them exceeding USEPA <br /> Maximum Contaminant Levels (MCL). It did not contain MtBE. The western portion of the tank farm <br /> area had low to no detections. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />