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I <br /> � 1 Y <br /> PUBLIC HtALTH SOPQI!?N'•.0 <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer . P <br /> 304 East Weber Avenue, Third Floor * Stockton, CA 95202 <br /> 2091468-3420 FILE C <br /> TERRY TARDITI <br /> T&T TRUCKING APR 12 1999 <br /> 11396 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 correspondence dated March 19, 1999 and the most recent monitor well sampling <br /> report (July l4, 1998) from Brown and Caldwell (consultants to T&T Trucking) for the above referenced <br /> site, San Joaquin County Public Health Services Environmental Health Division(PHS/EHD) provides the <br /> following comments and directives. <br /> All monitoring wells(MWI —MW4) installed,sampled,and analyzed at this site provide documentation of <br /> fuel hydrocarbon impacts to groundwater. Depth to water measured in monitor wells on September 16, <br /> 1998 was approximately 68' below grade surface(bgs). Hydropunch7M samples analyzed from the bottom <br /> of wells installed (MW2-MW4) by Brown and Caldwell document the presence of TPH-gas. BTEX and <br /> MTBE at depth (MW2 @ 75.5-77'bgs, MW3 @ 75-78'bgs, and MW4 @ 71-74'bgs). Groundwater <br /> benzene concentrations have risen in monitor well 91 from 1 I ug/1 on December 7, 1995, to 240 ugh on <br /> July 29, 1997,to 2000 ug/l on August 14, 1998 positioned in close proximity to the former tank pit. As of <br /> August 14, 1998 MTBE has also been detected in MWI at 9.6 ug/l. The increasing concentration change <br /> reported suggests that plume dynamics are unpredictable in both the vadose and saturated zones. <br /> Hydropunch samples from the bottoms of new wells installed indicated that further assessment may be <br /> needed vertically and laterally (ex.- MW4, TPH-g 3000 ug/l, Benzene 730 ug/l, MTBE 17ug/i at 71-74' <br /> bgs). <br /> PHS/EHD has not received monitoring data on a quarterly basis from any well installed at any time during <br /> the last 4 years. September 29, 1997 correspondence by PHS/EHD to the responsible party requested <br /> monitoring of the groundwater contaminant plumes on a quarterly basis. PHS/EHD now directs the <br /> responsible party to monitor the groundwater contaminant plume on a quarterly basis. Please <br /> discuss the results of your plume monitoring in your Quarterly Reports. In the event continued plume <br /> migration is identified, or impact to any Water Supply Well is predicted please include recommendations <br /> for the installation of additional wells or remediation alternatives in the site Quarterly Monitoring Reports. <br /> Considering the absence of time series data the responsible party should evaluate quarterly data in order to <br /> determine if the plume is defined given the existing monitor well network. Please be aware that MW2 <br /> (documented benzene impacts in groundwater samples from this well) is positioned not more than 125' <br /> laterally from the on-site domestic drinking water well and the former tank pit is not more than 180' <br /> laterally from this same drinking water well. <br /> During phone discussions with Tina Bauer of Brown and Caldwell (consultant to RP), PHS/EHD was <br /> notified of current fieldwork at the above referenced site during the week of January 19, 1998. The <br /> fieldwork included a transducer study not directed, evaluated, or approved by PHS/EHD. Ms. Bauer <br /> agreed to provide PHS/EHD with a copy of the transducer study workplan. The transducer study was <br /> A Division of San Joaquin County Health Care Services <br />