Laserfiche WebLink
_L <br /> • <br /> Qamn <br /> WO Chevron <br /> • <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> October 20, 1995 Marketing—Northwest Region <br /> Phone 510 842 9500 <br /> Mr.Harlin Knoll <br /> San Joaquin County Public Health Services <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: Chevron Station#9-2033. 508 W. Charter Way. Stockton,CA <br /> Attached Groundwater Monitoring Report(Blaine Tech,9/11/95) <br /> Dear Mr. Knoll: <br /> Attached you will find a report dated September 11, 1995,which was prepared by Chevron's consultant, <br /> Blaine Tech Services,Inc. (Blaine Tech),to describe the results of groundwater monitoring that was <br /> performed at the subject site on August 15, 1995. <br /> In August,Blaine Tech gauged and sampled all three site-related wells. The measured direction of <br /> groundwater flow beneath the site was toward the southwest. Groundwater samples collected from each <br /> well were analyzed for the presence of TPHGas,BTEX constituents,and halogenated volatile organic <br /> compounds(HVOC's). In addition, samples from well MW-1 were analyzed for waste oil constituents <br /> (i.e.,TPHDiesel,total oil and grease, metals,and semi-volatile organic compounds- SVOC's). <br /> Dissolved petroleum hydrocarbons were again,detected at wells MW-I and MW-3. The measured <br /> concentrations were consistent with those detected during the previous site monitoring event.No dissolved <br /> hydrocarbons were detected at well MW-2. Groundwater from MW-1 also contained measurable <br /> concentrations of 1,2 Dichloroethane. Phenol was not detected at well MW-1. An unidentified <br /> hydrocarbon was reported during TPHDiesel analysis of groundwater from well MW-1. No further <br /> elaboration was made as to what the unidentified constituent may be. The reported levels of total metals <br /> from MW-1 were consistent with those reported for the last monitoring event. It should be pointed out that <br /> these values represent total levels and are not necessarily representative of what is dissolved in <br /> groundwater.Therefore,subsequent measurements will analyze only for those metals dissolved in <br /> groundwater. <br /> The detection of hydrocarbons at the upgradient well(MW-3)still suggests the possibility of an offsite <br /> source. I will look to confirm this suspicion at the upcoming meeting at your agency on October 30, 1995. <br /> If you have any questions or comments,I can be reached at(510) 842-8695. <br /> • <br /> Sincerely, <br />