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;.Av4. •;� EuMNNu G.BNVWN JN. <br /> GOVERNOR <br /> O 1110.M l• MGPFT+NRY R ODRIOUE2 <br /> Water Boards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> NOV 0� 2013 <br /> 7 November 2013 'IH <br /> ��IIRONMT 8Ea tC�� <br /> Estate of Barbara J. Hidaka- Thomas O'Neill PERM <br /> Cindy O'Neill, Executor Valley Motors <br /> 3g <br /> 465 Gleneagles Drive <br /> 800 East Main Street <br /> i <br /> Stockton, CA 95219 Stockton, CA 95202 <br />} <br /> a <br /> I <br /> UMENT-REVIEW;--VAi-L-E-Y-MOT-ORS,-800-EAB9-MAIN-&T-RFET,-STOCKTON,_.._- - <br /> SAN JOAQUIN COUNTY(RB CASE#390546) <br /> California Regional Water Quality Control Board; Central Valley Region (Central Valley Water Board) <br /> staff reviewed the Third Quarter 2093 Report(Report) received electronically on 1 November 2013 in the <br /> State Water Resources Control Board Geotracker database.from your consultant Upgradient <br /> Environmental Consultants (UEC). The Report provides the results of the groundwater monitoring <br /> conducted on 19 September 2013. Maximum groundwater concentrations were total petroleum <br /> hydrocarbons as gasoline, 8,700 micrograms per Liter(ug/L); benzene, 337 ug/L; toluene, 1,150 ug/L; <br /> ethylbenzene, 722 ug/L; and xylenes, 1,910 ug/L. Depths to groundwater varied from 28' to 29' below <br /> ground surface. Groundwater flow direction was towards the east. UEC recommends continued <br /> quarterly monitoring and implementation of groundwater treatment. <br /> Central Valley Water Board staff concur to continue monitoring groundwater to determine if the case <br /> meets the criteria for a Low Threat Closure, but do not concur to UEC's recommendation to conduct the <br /> permanganate injections at this time. While groundwater concentrations rebounded to 2012 levels in <br /> well VM-9, the groundwater concentrations in VW-2 (historically the highest) are still an.order of <br /> magnitude below 2011 concentrations. The plume currently appears stable. The next monitoring report <br /> is due 30 January 2014. <br /> You,may�a —ewitr your ques ionsby phone at-(91-6)-464=461-5 nr b-y-e- m'l -- <br /> ibarton(a�waterboards.ca.gov. � <br /> i <br /> 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 /> t KARL E. LONGLEY SCD, P.E., CHAIR PAMELA C. CREEDON P.E., BCEE, EXECUTIVE Orf ICEn <br /> 11020 Sun Center Drlve#200.Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> • I <br /> c�.REGYGLED PAPER <br />