|
California Regional Water Quality Control Board
<br /> li Central Valley Region tt
<br /> Karl E. Longley, ScD, P.E., Chair
<br /> Arnold
<br /> Linda S. Adams 11020 Sun Center Drive#200, Rancho Cordova, California 95667 4
<br /> Secretary for Phone(916)464-3291 •FAX(91646Q �1Vpil1[r� Schwarzenegger
<br /> Environmental http://www.waterboards.ca 9 a Governor
<br /> Protection 1❑�-,��
<br /> 16 November 2009 wq 1 $ 2009
<br /> Ms. Eugenia Valdez ENVERMIRERVICESH
<br /> J&L Market p
<br /> 8125 EI Dorado Street
<br /> French Camp, CA 95231
<br /> DOCUMENTS REVIEW, J&L MARKET, 8125 S. EL DORADO ST., FRENCH CAMP,
<br /> SAN JOAQUIN COUNTY, CASE NO. 390897
<br /> 1 reviewed the Subsurface Investigation Workplan (Workplan) and the Monitoring Report Second
<br /> Quarter 2009 (2Q2009), received 3 November 2009 from your consultant ATC Associates, Inc. The
<br /> Workplan proposes installation of two 2" diameter groundwater monitoring wells along the northern
<br /> boundary of the site, one screened at approximately 80' to 90' below ground surface (bgs) and the
<br /> other screened approximately 130' to 140' logs, to complete delineation of the intermediate and deep
<br /> aquifer zones. Conductor casing will be advanced to eliminate cross contamination from the shallow
<br /> (both new wells) and middle aquifers (deeper well). The 2Q2009 states maximum groundwater
<br /> monitoring concentrations were total petroleum hydrocarbons as gasoline (TPHg), 4,200 micrograms
<br /> per Liter (ug/L); TPH as diesel (TPHd), 3,300 ug/L; benzene, 540 ug/L; toluene, 7.7 ug/L;
<br /> ethylbenzene, 660 ug/L; xylenes, 80 ug/L; methyl tert-butyl ether (MTBE), 7.4 ug/L; 1, 2-dichloroethane
<br /> (1, 2-DCA), 59 ug/L; and tertiary butyl alcohol (TBA), 23 ug/L. TPHd and 1, 2-DCA were detected in all
<br /> three (shallow, intermediate, and deep) aquifer zones; while TPHg, benzene, toluene, ethylbenzene,
<br /> xylenes, and MTBE were detected in the shallow and intermediate aquifer zones.
<br /> The Workplan is on hold, pending the results of the fourth quarter 2009 (semi-annual) monitoring
<br /> report, due 30 January 2009. If the fourth quarter 2009 results show declining contaminant trends in
<br /> intermediate and deep aquifers, then the Workplan will remain on hold until groundwater monitoring
<br /> shows a significant increasing trend in the existing intermediate and deep aquifers wells.
<br /> The groundwater monitoring will be reduced to the following: analyze and report only those
<br /> constituents detected in the last four quarterly sampling events (example: for JLM3, report only TPHg,
<br /> TPHd, benzene, ethylbenzene, MTBE, TBA, and 1, 2-DCA); with the exception of sentry wells JLM15,
<br /> JLM17, JLM18 and JLM19, which shall be analyzed annually during the second semi-annual event
<br /> (4th quarter) for all current constituents, except ethylene dibromide and ethyl tertiary-butyl ether, which
<br /> have never been detected in groundwater. Further sample reductions will be considered pending
<br /> review of future monitoring reports. You may contact me regarding questions by phone at (916) 464-
<br /> 4 15; orf ns and status_{eport submittals, by e-mail at Larton(cr7waterboards.ca.gov.
<br /> ;James L.L. Barton, P.G.
<br /> j Engineering Geologist
<br /> UST Enforcement Unit 11
<br /> cc: Mr. Robert L'Heureux, SWRCB, UST Cleanup Fund, Sacramento
<br /> Mr. Michael Infurna, San Joaquin County Environmental Health Department, Stockton
<br /> Mr. Todd Hafner, ATC Associates, Inc., Modesto
<br /> California Environmental Protection Agency
<br /> C5 Recycled Paper
<br />
|