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• EDMUND G. BROWN JR. <br /> �.. ._.�-1�✓` .'f;t r1S !1 -f,,.)j�•. OOVERNOP <br /> h `�` �..N <br /> C DI OPM1 <br /> MAY 0 3 2013 � F VIRONMF 7 DRIOTFC <br /> WaterBoards FNVIRONMFNinI PRDTFOTION <br /> ..-,.1PAITL9 <br /> Central Valley Regional Water Quality Control Board-,-,.,,1'�l�:�F?��!��5 <br /> 1 May 2013 <br /> Estate of Barbara J. Hidaka Thomas O'Neill <br /> Cindy O'Neill, Executor Valley Motors <br /> 3465 Gleneagles Drive 800 East Main Street <br /> Stockton, CA 95219 Stockton, CA 95202 <br /> DOCUMENT REVIEW, VALLEY MOTORS, 800 EAST MAIN STREET, STOCKTON, <br /> SAN JOAQUIN COUNTY(RB CASE# 390546) <br /> 1 reviewed the First Quarter 2013 Report (Report) received electronically on 29 April 2013 in the <br /> State Water Resources Control Board Geotracker database from your consultant Upgradient <br /> Environmental Consultants. The Report provides the results of the groundwater monitoring <br /> conducted on 5 March 2013. Depths to groundwater varied from 27' below ground surface <br /> (bgs) to 28' bgs. Groundwater was flowing towards the east at an unspecified gradient. <br /> Maximum concentrations were total petroleum hydrocarbons as gasoline, 166 micrograms per <br /> Liter (ug/L); benzene, 22.5 ug/L; toluene, 3.8 ug/K; ethybenzene, 4 ug/L; and xylenes, 3.4 ug/L. <br /> The Report groundwater analytical results were one to three orders of magnitude lower than the <br /> March 2012 groundwater analytical results. The Report recommended continued semi-annual <br /> groundwater monitoring, and starting groundwater remediation when funding becomes <br /> available. <br /> Based on the Report results, the approved active remediation is immediately on hold, pending a <br /> two quarter (second and third quarter 2013) monitored natural attenuation groundwater <br /> evaluation. The next quarterly monitoring report is due 30 July 2013. A closure report, written <br /> in accordance with the Appendix.A Tri Regional Board Staff Recommendations for Preliminary <br /> Investigation and Evaluation of Underground Tank Sites, April 2004, and including initial and <br /> residual mass estimates and the time to reach water quality goals, is due 30 October 2013 if <br /> the second and third quarter 2013 data confirm that the Report declining concentration trend <br /> has continued with no significant rebound. You may contact me with your questions by phone <br /> at (916) 4664--44615 or by e-mail at jbarton waterboards.ca.gov. <br /> i <br /> f/James L.L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Kelli Graver, State Water Resources Control Board UST Cleanup Fund, Sacramento <br /> Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br /> Clyde Hebron, Upgradient Environmental Consultants, 3369 Kimberly Rd., <br /> Cameron Park 95682 <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E.. BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive$1200,Rancho Cordova,CA 95670 I www.waTerbo ards.ca-9 ov/centraiv a Iley <br /> ;a nTcmcD rarn <br />