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PW <br /> PUBLIC Ht*LTH SERVICES <br /> SAN JOAQUIN COUNTYr <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health OfficerID <br /> - .. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> TERRY TARDITI <br /> T&T TRUCKING SEP 2 9 1997 <br /> 11346 N HWY 99 <br /> LODI CA 95240 <br /> RE: T&T TRUCKING SITE CODE: 1627 <br /> 11396 N HWY 99 <br /> LODI CA <br /> As a result of reviewing the Preliminary Investigation Report dated August 28, 1997, submitted by <br /> Leeward Consultants (LC) on behalf of Terry Tarditi, San Joaquin County Public Health Services <br /> Environmental Health Division(PHS/EHD)provides the following comments and directives. <br /> This letter presents a directive for an immediate full three dimensional definition and investigation of soil <br /> and groundwater contamination by fuel hydrocarbon constituents resulting from an unauthorized release <br /> documented at your site.You are hereby required to complete a Soil and Water Investigation(SWI). <br /> The results of recent sampling at the site referenced above indicate the presence of Petroleum <br /> Hydrocarbons in soil and groundwater. Other fuel additives may also be present in the subsurface <br /> environment at this site as revealed by unidentified peaks on chromatograms found in WEST Laboratory <br /> data sets (see lab data sheets for samples 31-S4, B2-S3, B2-S5, B2-S8, B4-S3, B5-S2, B8-S2, B8-S4, B9- <br /> S6, and others). You are required to analyze water and selected soil samples for Tertiary Butanol, MTBE, <br /> DIPS, ETBE, and TAME employing EPA 8260(see CVRWQCB attachment#1) for all other constituents <br /> during each sampling event until further written notice from this office. Selected soil samples shall include <br /> historic low and high groundwater elevations and the current capillary fringe at a minimum. Traditional <br /> TPH as gasoline as well as BTEX analyses are also required. <br /> The conventional monitoring well installed by LC for this Underground Fuel Tank(UST) leak site may be <br /> insufficient to properly locate and define the extent or existence of MTBE / Fuel Additives at this site. <br /> MTBE plumes can be non-elliptical, long, narrow and erratic (meandering). Monitoring wells shall be <br /> constructed to assess preferential pathways where appropriate. Therefore, PHS/EHD directs you to <br /> perform a detailed, expedited site assessment using depth discrete and continuous core sampling to define <br /> and quantify the full three-dimensional extent of fuel additives, Total Petroleum Hydrocarbons, Benzene, <br /> and other known or suspected contaminants in groundwater. <br /> At least one dual completion (nested) well shall be installed as a sentry well on the north side of the <br /> temporary office facility building to intercept contaminant migration toward the domestic water supply <br /> well. The SWI workplan shall consider historic low and high groundwater elevations in the definition of <br /> the vertical aspect of contaminant distribution at this site. All wells installed and surveyed shall be <br /> referenced to an appropriate and designated bench mark. Well screen intervals shall not exceed 20' in total <br /> length. Discuss your proposal for performing this work in the workplan amendment requested below. <br /> Report the results of your investigation to this agency within 30 days of completion of the approved scope <br /> of work. <br /> A Division of San Joaquin County Health Care Services <br />