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PUBLIC HEALTH SERVICES ,oPQU : o <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer P <br /> q�lFbRa� <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> KEVIN BASSO <br /> INDEPENDENT TRUCKING COPY <br /> 1145 W CHARTER WAY <br /> STOCKTON CA 95206 APR 17 2000 <br /> RE: INDEPENDENT TRUCKING Site Code: 685 <br /> 401 LINCOLN ST <br /> STOCKTON CA 95206 <br /> San Joaquin County Public Health Services, Enviro ental Health Division (PHS/EHD) <br /> has reviewed the Site Investigation Report dated January 11, 2000, prepared by <br /> Innovative & Creative Environmental Solutions (IC S) for the above referenced site. <br /> Soil and groundwater samples collected during the investigation evidence contamination. <br /> Further site investigation will be necessary to detemime the lateral and vertical extent of <br /> soil and water contamination. <br /> The deepest soil sample collected from the boring o Monitoring Well (MW) 1 evidenced <br /> concentrations of Total Petroleum Hydrocarbons (T H) as diesel at 2.1 parts per million <br /> (ppm) 30 feet below surface grade (bsg). The deepest soil sample collected in Soil <br /> Boring (SB)2 at 35 feet bsg evidenced Benzene, Toluene, Ethylbenzene, Xylene (BTEX) <br /> and TPH as gasoline (TPHg) at concentrations of.0 8, .072, .132, .66, and 3.1 ppm <br /> respectively. The vertical extent of contamination i i these locations has not been <br /> determined. Further investigation should include a vancing borings to a depth necessary, <br /> in a location near MW 1 and SB2, until soil samples collected from two consecutive five <br /> foot intervals evidence nondetectable contaminatio . Soil samples should be collected at <br /> every five foot interval and at every significant lithc logical change below previously <br /> explored soil depths. <br /> Definition of groundwater contamination will need to be determined down gradient of <br /> MW 1 and MW3. The installation of a down-gradient repeatable sampling point may be <br /> necessary to define the lateral extent of groundwater contamination. <br /> Other fuel additives may be present in the subsurface environment at this site. <br /> Groundwater should be monitored quarterly for TPlIg and TPHd by EPA Method <br /> 8015M, BTEX by EPA Method 8020, and for MTBE, TBA, DIPE, TAME, ETBE, 1,2- <br /> DCA, EDB, ethanol and methanol by EPA Method 9260B. Some laboratories can run a <br /> complete suite of petroleum constituents and fuel additives using EPA Method 8260B, <br /> thereby saving considerable cost. Quarterly monitoring should continue at this site until <br /> further direction from PHS/EHD. <br /> A Division of San Joaquin County ealth Care Services <br />