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i <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r. <br /> ENVIRONMENTAL HEALTH DIVISION ": • n `< <br /> Karen Furst, M.D. , M.P.H . , Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 COP <br /> 209/468-3420 <br /> FLOYD BARNES AUG 2 ® 1998 <br /> 9744 FOUNTAIN VALLEY <br /> STOCKTON CA 95209 <br /> RE : Barnes Trucking Site Code : 2506 <br /> 1817 Fresno Avenue <br /> Stockton , CA 95206 <br /> San Joaquin County Public Health Services , Environmental Health Division <br /> ( PHS/EHD ) has reviewed the "Groundwater Monitoring Report, Second Quarter <br /> 1998" which was prepared for the above reverenced site by Clearwater Group , <br /> Inc . , and has the following comments for your review and action . <br /> Groundwater samples were collected on March 13 , 1998 and analyzed for Total <br /> Petroleum Hydrocarbons as gas (TPHg) ; TPH as diesel (TPHd) ; Benzene , <br /> Toluene , Ethylbenzene and Xylene (BTEX) ; and five fuel oxygenates. Results of <br /> these analyses continued to evidence significant impact to groundwater, with the <br /> highest levels showing in MW- 1 , which is directly downgradient of the former <br /> tank pit. Results show 230 parts per billion (ppb) Benzene and 280 ppb <br /> Toluene . Both of these results exceed the maximum contaminant level ( MCL) <br /> for these constituents in public drinking water as established by the California <br /> State Department of Health Services . Results also show 9200 ppb of TPHg in <br /> the same well . <br /> Groundwater levels at the site rose approximately five feet in the interval <br /> between the collection of the first round of groundwater monitoring samples <br /> (9/29/97) and the current round (5/13/98) . Rising water levels of this magnitude <br /> tend to dilute the water samples , as is indicated by the dramatic change in <br /> results noted between the two samples . <br /> PHS/EHD agrees at this time that vertical definition in soil appears to have been <br /> made . Lateral definition in the down gradient direction remains unknown . <br /> Please proceed with the recommendations of Clearwater Group , Inc. <br /> (Subsurface Investigation Report, Nov. 20 , 1997) and prepare a workplan for the <br /> advancement of two soil borings in the down-gradient direction , to be completed <br /> as monitoring wells . Please submit the workplan to PHS/EHD by Oct. 5 , 1998 . <br /> A Division oFSan Joaquin County Health Care Services <br />