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CAM BR l A <br /> July 26, 2000 <br /> via facsimile <br /> (209) 464-0138 <br /> Ms, Carol Oz <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> M <br /> Re: Caltrans Well Sampling <br /> BP Oil Site No. 111:93 <br /> 3202 West Hammer Lane <br /> Stockton, California f <br /> Dear Ms. Oz: <br /> Cambria Environmental Technology, Inc. has prepared this correspondence regarding confirmation <br /> saTphng,of the California Department of Transportation(Caltrans)irrigation located near the above- <br /> . } o a3:ri .l..j,.- -s - - V . <br /> referenced BP Oil Company (BP) site. As you know, the only analyte reported in a water sample <br /> collected,from the Caltrans wellonMay 24,,2000 was tent butyl alcohol (TBA) at 11 micrograms per <br /> liter(µg/L) (detection limit of l0µglL) Attempts to collect confirmation samples on June 13,i2000 <br /> and during the.site quarterly monitoring activities on July 14, 2000 were not successful because the <br /> well pump was not operational. A July 24, 2000 San Joaquin County Public Health Services letter <br /> requested confirmation sampling of this well prior to planned destruction activities. <br /> Based on your voice mail message of earlier today and our subsequent discussion with Andy Stephens <br /> of Stephens Construction Company,the pump in the Caltrans well is now operational. Confirmation <br /> sampling of the Caltranswell is scheduled For Friday, July„28, 2000. We-understand-tliat Bob <br /> i <br /> Highfield of Stephens Construction will meet our technician onsite during sampling activities in case <br /> of pump problems. <br /> Oakland, CA _ The well will be sampled by running water from the hose bib for 30 minutes and filling the sample <br /> San Ramon, CA <br /> 5 an a m a, c A containers directly from the hose bib. The sample will be analyzed for total petroleum hydrocarbons- <br /> IY Por 1 i a n d, OR as gasoline using modified EPA Method 8015, and benzene, toluene,ethylbenzene,xylenes, methyl <br /> tert butyl_ ether, diisopropyl. ether, ethyl, tert butyl ether, tert amyl methyl ether TBA, <br /> C Cambria <br /> Environmental J,,2 dlchloroethane,methanol and ethanol using EPA Method 8260Thisdata will be presented in the <br /> /..i�i <br /> Technology,Inc. Well Installationj- gport, which we anticipate submitting in 45 60 days <br /> f• <br /> 1144 65th Street <br /> itt Suite s <br /> Oakland,CA 94608 <br /> TO(510)420-0700 <br /> Fax(510)420-9170 <br />