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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K.Heron,R.E.H.S. Carl Bergman,R.E.H.S. <br /> Director 304 East Weber Avenue,Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> P.� Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> • o'IiFba`'v Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> JAMES GIOTTONINI MAR 18 2003 <br /> PUBLIC WORKS DIRECTOR <br /> CITY OF STOCKTON <br /> 425 N EL DORADO <br /> STOCKTON CA 95202 <br /> RE: SMITH CANAL PUMP STATION VAN BUSKIRK GOLF COURSE <br /> 2144 FONTANA DRIVE 1740 HOUSTON AVENUE <br /> STOCKTON,CA STOCKTON,CA <br /> A meeting with Central Valley Regional Water Quality Control Board(CVRWQCB)was held on March 12,2003 at San <br /> Joaquin County Environmental Health Department(EHD)to discuss the two above-referenced sites. Representing EHD <br /> were Margaret Lagorio,Nuel C.Henderson,and Jeff Wong. Representing CVRWQCB were Cori Condon and James L. <br /> Barton. The following is a summary of the meeting. <br /> SMITH CANAL PUMP STATION <br /> CVRWQCB agreed with EHD that after five quarters of sampling since the installation of the northernmost down gradient <br /> monitoring well bIW7 in February 2002,the site is a candidate for"no further action"status. Currentlythe only well with <br /> detectable level of dissolved petroleum hydrocarbon as diesel is MW-4,and samples from all other monitoring wells have <br /> been non-detect for the last three consecutive quarters. The three dimensional extent of the contamination in both soil and <br /> groundwater has been defined. The plume appears to be stable and retracting,and detectable level has continued to <br /> decrease in concentration. EHD will be submitting an official request letter for concurrence for closure status to <br /> CVRWQCB. <br /> VAN BUSKIRK GOLF COURSE <br /> CVRWQCB does not agree that the site is eligible for closure consideration at this time. Methyl tea buns ether(MTBE) <br /> has been detected in the deep well MW-9 screened from 70 feet to 75 feet at concentrations 58 and 66µg/l during the third <br /> and fourth quarters of 2003,respectively. The vertical extent of the contamination is not defined. The California <br /> Department of Health has established a primary Maximum Contaminant Level(MCL)in drinking water for MTBE at 13 <br /> parts per billion(ppb). Additional work is required to define the vertical and lateral extent of the MTBE plume. <br /> AGE calculated in FirrtQuarrer#Report 2001 dated April 25,2001 a mass of 77 grams of dissolved MTBE left remaining at <br /> the site. The number was based on a 30-foot thick ellipsoidal volume using an average NITBE concentration number o€100 <br /> pg/1 from analytical results of MW3,MW-4,and MW-6 groundwater samples.This calculation is invalid because the <br /> volume of the MTBE plume appears to be substantially larger since the installation of MW-9. The contamination mass <br /> should be recalculated after the extent of the plume has been defined. <br /> CVRWQCB recommended evaluating the cost-versus-effectiveness of a limited groundwater extraction from MW-4, <br /> consistently the most contaminated well,to control the MTBE plume from migrating further downgradient(north)or <br /> downward. Regardless whether a remediation is required at the site,the extent of the MTBE plume must be defined by <br /> additional investigation and a 2000-foot receptor survey should be performed. <br /> Donna HeeREHS,Director <br /> E�nvCiJ.ronme 9ta taI Health Department <br /> 4Jeffrey Wong,Senior REHS Nuel C.Henderson,Jr.,RG <br /> LOP/Site'Mitigation Unit IV LOP/Site Mitigation Unit IN' <br /> e. CVRWQCB—James L.L.Barton,RG <br /> AGE-Bill Little <br /> ATC—William Shipp <br />