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ENVIRONMO' ENTAL HEALTHI)EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> o •• " c <br /> 2 y Donna K. Heran, R.E.H.S. Unit Supervisors <br /> yi :< Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> • �., P • Program Manager Telephone: (209)468-3420 Douglas W. Wilson,R.E.H.S. <br /> R�\ Margaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert Mcclellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> DALE BOYETT APR 14 20M <br /> BOYETT PETROLEUM <br /> P O BOX 576277 <br /> MODESTO CA 95357-6277 <br /> KULJIT S MANGAT <br /> 662 CLAY WAY <br /> RIPON CA 95366 <br /> Re: BOYETT PETROLEUM Site Code: 1433 <br /> 419 S.MAIN ST. <br /> MANTECA CA 95336 <br /> On April 12,2006,San Joaquin County Environmental Health Department (EHD) <br /> discussed with State Regional Water Quality Control Board (RWQCB) the no-fintier action <br /> request for the above-referenced site as recommended by your consultant, Condor Earth <br /> Technologies,Inc. (Condor). EHD had reviewed No FurtherAction Request(the report) dated <br /> October 7, 2005,and ThirdQuarterMonitoring Report dated November 4,2005,prepared by <br /> Condor. EHD has also received the latest analytical results for monitoring well groundwater <br /> samples from the fourth quarter of 2005 and first quarter of 2006 by facsimile. With the <br /> exception of monitoring well MW-11 and extraction well EW-1, the results of the <br /> groundwater samples were all either non-detect(ND) or below both the primary maximum <br /> contaminant level (MCL) of 13 micrograms per liter (ug/1) and the secondary MCL of 5 ug/1 <br /> for methyl tert-butyl ether (MTBE) as established by California Department of Health <br /> Serves (DHS). The fourth quarter 2005 MTBE concentrations in the MW-11 and EW-1 <br /> samples were 91 ug/1 and 25 ug/1, respectively,and the first quarter 2006 results were 100 <br /> u/1 and 23 ug/1,respectively. The concentration of MTBE the two latest quarters has <br /> increased in comparison to the two previous quarters (second and third quarters of 2005). <br /> The lateral extent of the MTBE plume has not been fully defined in the northwest direction. <br /> In 2003,hydropunch HP3 was advanced approximately 110 feet northwest of the now <br /> destroyed MW-1 where the highest concentration of dissolved MTBE was detected in the <br /> MW-1 groundwater samples (27,000 ug/1 in June,2001). The results of the HP3 grab water <br /> sample, collected at 23 feet below surface grade (bsg),were 320 ug/l MTBE, and from 28 <br /> feet bsg the results were 490 ug/l MTBE. Condor stated in the report that"background" <br /> levels could not reached using best available technology (BAT),but natural attenuation will <br /> bring the remaining contaminant concentration to background levels over time(page 4). Condor did not <br /> provide a fate and transport model or calculations supporting this statement, or an estimate <br /> of time required for background levels to be reached by natural attenuation. Condor <br />