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ENVIRONMENTAL HEALTH DEPARTMENT <br /> aAau�" <br /> SAN JOAQUIN COUNTY <br /> ?-• o Uwn SreFrrrfsors <br /> Donna KCarl Borgman,R.E.H.S. <br /> K.Herne,R.E.x.s. 304 East Weber Avenue,Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> '• Al Olsen,ILF-ELS. Stockton, California 95202-2708 Douglas W.Wilson,R EX.S. <br /> * Prog►�„ns� Telephone: (209) 458-3420 Margaret Lagorio,R.E.H.S. <br /> <i ri o <br /> Laurie A.Cotalla,R.E.H.S. <br /> Fax' (209) 464-0138 Robert McClellott,R.E.H.S. <br /> Program Manager Mark Barceilos,R.E.H.S. <br /> 'TAXES GIQTTQNINIMAR 18 2003 <br /> PUBLIC WORKS DIRECTOR RIMOEIVED <br /> CITY OF STOCKTON MAR 2 0 2003 <br /> 425 N LL DORADO . <br /> STOCKTON CA 95202 <br /> RE: SMITH CANAL PUMP STATION VAN BUSKIRK GOLF COURSE <br /> 2144 FONTANA DRAM 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 Sus <br /> Joaquin County Environmental Health Department(EHD)to discuss the two above-referenced sites. Representing EHD <br /> were Margaret Lagorio,Nuel C.Henderson,a,nd Jeff Wong. Representing CVRWQCB were Cori Condon and James L <br /> Barton. The following is a summary of the meeting. <br /> SMITH CANAL PUMP STA'T'ION <br /> CVRWQCB agreed with EI-ID that after five quarters of sampling since the installation of the northernmost down gradient <br /> monitoring well MW7 in February 2002,the site is a candidate for"no further action' status. Currently else only well with <br /> detectable level of dissolved petroleum hydrocarbon as diesel is MW-4,and samples from all other iniroeitsg wells have <br /> been non-detect for the last three consecutive quarters. The three diraenaional extent of the conmmination 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 BUSSIRK GOLF COURSE <br /> CVRWQCB does not agree that the site is eligible for closure consideration at this time. Methyl tert butyl 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 dumsg the third <br /> and fourth quarters of 2003,respectively, 'rhe vertical extent of the contamination is not defused. 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 FirstQ Rrperi .740142teed 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 MTBE concentration numberof 100 <br /> µg/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-effectivenmof a limited groundwater extraction from MW-4, <br /> consistently the most contaminated well,to control the MTBE plume from migrating further downgmdient(north)-or <br /> downward. Regardless whether a remediation is required at the ub_,the extent of the MTBE plume must be defined by <br /> additional investigation and a 2400-foot receptor survey should be performed. <br /> Donna 14=u,.REHS,Director <br /> En ' 7o.&PSHen(=' <br /> eathJeffrry RENS Nuel C.Henderson,Jr.,RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit Tit <br /> C WQCB—James L L Barton,RG l <br /> V GE-Bill Little <br /> ATC Wtii 'ern Shipp <br />