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f i ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY r ,^ R an Donna K.Her , .E.H.S. Carl Borgtnan,R.E.H.S. 304 East Weber Avenue,Third Floor ' Director Mike Huggins,R.E.H.S.,R.D.I. Al 01m,R.E.H.S. Stockton, California 95202-270$ Douglas W.Wilson,RX-H.S. Program Manager Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. trrroR`� LAurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. Program Manager Fax: (209)464-0138 Mark Bareellos,R.E.H.S. JAMES GIOTTONINIt� MAR 18 2003 PUBLIC WORKS DIRECTOR ECE � r1D CITY OF STOCKTON MAR 2 0 2003 425 N EL DORADO . STOCKTON CA 95202 RE. SMITH CANAL PUMP STATION VAN BUSKIRK GOLF COURSE 2144 FONTANA DRIVE 1740 HOUSTON AVENUE STOCKTON,CA STOCKTON,CA A meeting with Central Valley Regional Water QuaBry Control Board(CVRWQCB)was held on March 12,2003 at San Joaquin County Environmental Health Department(EHD)to discuss the two above-referenced sites. Representing EHD were Margaret I.agorio,Nuel C.Henderson,and Jeff Wong. Representing CVRWQCB were Cori Condon and James L Barton. The following is a suaumaty of the meeting. SMITH CANAL PUMP STATION CVRWQCB agreed with EHD that after five quarters of sampling since the installation of the northernmost down gradient monitoring well MW7 m February 2002,the site is a candidate for"no further action status. Currently the only well with detectable level of dissolved petroleum hydrocarbon as diesel is MW-4,and samples from all other monitoring wells have been non-detect for the last three consecutive quarm a. The three dimensional extent of the contamination in both soil and groundwater has been defined The plume appears to be stable and retracting and detectable level has continued to decrease in concentration. EHD will be submitting an official request letter for concurrence for closure status to CVRWQCB. VAN BUSMK GOLF COURSE CVRWQCB does not agree that the site is eligible for closure consideration at this time. Diethyl tent butyl ether(MBE) has been detected in the deep well MW-9 screened Ecom 70 feet to 75 feet at concentrations 58 and GG lrg/l during the third and fourth quarters of 2003,respectively. The vertical extent of the contamination is not defined. The California Department of Health has established a primary Maximum Contaminant Level(MCL)in drinking water for MTBE at 13 parts per billion(ppb). Additional work is required to define the vertical and lateral extent of the MTBE plume, AGE calculated in Nr0QmarAv#Report 20101 dated April 25,2001 a mass of 77 grams of dissolved MT79E left remaining at the site. the number was based on a 30-foot thick ellipsoidal volume using an average MTBE concentration number bf 100 µg/1 from analytical results of NIW3,MW4,and MW-6 groundwater samples.This calculation is invalid because the volume of the MTBE plume appears to be substantially larger since the installation o0. The contamination masa should be recalculated after the ectent'of the phone has been defined. CVRWQCB recommended evaluating the cost versus-effectiveness•of a limited gr+oundwaaer extraction from MW-4, consistently the most contaminated well,to control the MTBE plume from migrating finther downgndient(north),or downward. Regardless whether a remediation is required at the site,the extent of the MTBE plume must be defined by additional investigation and a 2000-foot receptor survey should be performed Donna Heran,.REHS,Direcroc �j�� En ' nal Health Departinemt �/��`^"' jeffaey ting Senior RENS Nuri C.Henderson,Jn,RG LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV c CVRWQCB—James L L Barton,RG r� /AGE-Bill Little ATC—William Shipp