Laserfiche WebLink
TIPOEPARTMENT <br /> E <br /> NVIRoN ENTAL IJEAL SAN JOAQUIN COUNTY Unit Supervisors <br /> ''O Third Floor Carl Borgman,R.E.H. <br /> Donna K. Heron R.E.H.S. ins, R.E.H.S., R.D.I. <br /> z•, 2 304 East Weber venue, Mike Hugg <br /> K Director Stockton,California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Al Olsen, R.E.H.S. ( )468-3420 Margaret Lagorio,R.E.H.S, <br /> Program Manager Telephone: 209 <br /> 2p9 464-0138 Robert McClellon, R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Fax: ( ) Teff Carruesco,R.E.H.S. <br /> Program Manager Website:www.sjgov.orglehd/ <br /> NAMES GIOTTONINI DEC 0 8 ZOO <br /> PUBLIC WORKS DIRECTOR <br /> CITY OF STOCKTON <br /> 425 N EL DORADO <br /> STOCKTON CA 95202 <br /> RE: 110 W SONORA ST <br /> FIRE STATION #2 <br /> STOCKTON CA <br /> meeting was held on October 26, (F-14 ). the nfdin thSan 1e,tingtn County were Sharla Hardy and <br /> A g <br /> Environmental Health Department (EHD}ouArtconsulg nt Wtlltam Little of Advanced <br /> you representing Ctry of Stockton (COS),y <br /> stem IAS/SVE) was in operation at <br /> GeoEnvironmental,Inc. (AGE),and Marga ret nLagorio and Jeffrey Wong representing <br /> F ID. A soil vapor extsactionlm-sttu air spa g g Yand resumed operation <br /> the above-referenced site between October 2001 and sAugust <br /> s g 2002,ubsequently replaced by <br /> as <br /> between]anuary S) i and July 2003- The IAS S Y <br /> 05 in July 2003. initially ozone was ale�d5into the <br /> to 40 feet ifet belowsurface <br /> ozone sparging ( ) ended b <br /> three existing atr sparge Fells IAS-1 to IAS-3 screened from <br /> de s Since these wells were not designed for ° Was modified the y <br /> gra (b <br /> 1{VA,the manufacturer of the ozone system, system <br /> installation of <br /> February 2005well OZ-1,which incorporates a micxong re results the contaminate n plumee <br /> Based on the history of quarterly groundwater sampling res :)peared to be <br /> alined around VW-2d (screened from 34 to ncenrrattfeet ons to V',1 2d h s been N <br /> remained cenand al <br /> ts at the ' <br /> stable;however, the more ha of dissolved <br /> years of ozone h)ection. EHD recommended remediation <br /> modest at best after the operation of the OS systemP <br /> meeting to temporarily terminating p <br /> and to evaluate if continuation or restarting the OS system is requited. <br /> monitoring, <br /> conversation ward <br /> ith Central Valley Regional Warn the OS system ool Q p°t- <br /> Quality Contr <br /> In a telephone2005 EHD discussed terminating <br /> (CVRWQCB) on October 27, uaderl Re ort(the report) dated <br /> remediation monitoring. Accoxde�gof the S�onito i g wyader Q s sampled in Septemtical ethodber 5, <br /> October 6,2005 prepared by AG. the <br /> only VW-2d continued to have contaminantconcentrations lmed sestable norYin decline. <br /> Y <br /> detection limits, in the size of the co <br /> However, there does not appear to be a significantreduction the concentrations nof VNVe2d aeons <br /> Howe <br /> the concentrations would rebound back to <br /> in��V-2d after two ydurin f ort in quarters,• Although <br /> samples would drop g <br /> previous concentration levels in subsequent quarters (see Table 1). <br />