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a 4 EA ENGINEERING, Western Regional operations r SCIENCE, AND 41 Lafayette Circle TECHNOLOGY, INC. {415)283:California 94549 QUARTERLY REPORT JUNE 1989 I PROJECT: Exxon Retail Site 7-1050 909 Hammer Lane Stockton, California i EA PROJECT: EXX84L/10256. 14 WORK PERFORMED: Monitored and sampled wells on site on 3 May 1989. i Submitted work plan to San Joaquin Environmental Health and to the California Regional Water borings. and Quality Control Board, for 3 soil 9 possible site excavation in response to request by. Central Valley Regional Water Quality Control Board. Discussions with the Central Valley Region of the RWQCB have indicated that € this site has been assigned to the pilot program where San Joaquin. Environmental Health is acting as the lead agency; the : . RWQCB is working in an advisory capacity. ANALYTICAL CHEMISTRY RESULTS: Well Total Ethyl- Petroleum No. Date Benzene Toluene Benzene 2� nes H drocarbons d Soil Concentration (mg/kg) (ppm) No soil data. - } i Water Concentration mg/liter (ppm) 7 MW1 05/03/89 <0.0005 <0.0005 <0.0005 <0.0005 <0. 1 MW2 , 05/03/89 <0.0005 <0.0005 <0.0005 <0.0005 <O. i MW3 05/03/89 0. 140 -0_._520 - 0. 1-i0 r _ .. 0.520 -. 8. 1 - Mw4 05/03/89 <0.0005 <0.0005 c0.00,05 0.0006 0.300 MW5 05/03/89 <0.. N"I .0005 <0.0005 <0.0005 <.0.0005 <0. 1 MW1 02/07/89 <0:0002. <0.0002 <o.o002 (0.0002 <0.25.,. MW2 . . 02/07/89 <0.0002 0. 0.00E <0.0002 . <0,0002 <0.25 Q. MW3 02/07/89 0 12 0.36 0.075 0..51 0.51 8. MW4 02/.07/89 <0:0002 <0.. 00.02 . <0:0002 0.0006 <0.25 . MWS 02/07/89 <0.0002 <0. 0002 <0.0002 <0.002 <0:25 e25/71050/joaquin- 1 BALTIMORE C1 CHICAGO 0 CINCINNATI ❑ LINCOLN D NEW YORK ❑ SAN FRANCISCO ti . , ..r. .,.;s:.. .. y1