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STAT$ OF CALIFORNIA <br />CAL&ORNiA REGIONAL WATErQUALITY CONTROL BOARD— <br />CENTRAL VALLEY REGION <br />3443 ROUTIER ROAD <br />SACRAMENTO, CA 95827-3098 <br />NlrluF]�fFI �l <br />Mr. Gary Brophy <br />1235 Slayton Drive <br />Manteca, CA 95336 <br />GEORGE DEUKMEJIAN, Governor <br />..r <br />r� <br />z <br />QUARTERLY MONITORING AND SAMPLING OF GROUND WATER AT FORMER TEXACO SERVICE <br />STATION, 941 EAST YOSEMITE AVENUE, MANTECA, SAN JOAQUIN COUNTY <br />We are in the procoss of reviewing your 3 January 1989 Preliminary Report <br />(PR). During our review of the PR we noted that ground water contamination <br />exists at this site. In order to document fluctuations and possible <br />degradation in hydrocarbon contaminant levels at your site, we recommend that <br />quarterly monitoring of ground water be initiated immediately. Samples are to <br />be collected and analyzed for benzene, toluene, xylene, and ethylbenzene <br />(BTX&E) and total petroleum hydrocarbons as gasoline and diesel (TPH as G and <br />TPH as D). Water levels also need to be monitored quarterly to document <br />ground water level fluctuations and to verify the gradient direction. <br />We are preparing a detailed response to your 3 January 1989 PR which should be <br />finalized and sent to you by the end of next week. <br />If you have any questions, please call me at (916) 361-5725. <br />9"6�U.,4Gvvrtiu� <br />EDWARD W. MES <br />Engineering Geologist <br />1..l. _ <br />CnV.OwJ <br />cc: ✓ Ms. Diane Hinson, San Joaquin Local Health District, Stockton <br />Mr. Keith Romstad, Applied Geosystems, Sacramento <br />