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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> zr j X Donna K.Heran,R.E.H.S. Unit Supervisors <br /> v: <br /> , <br /> Director <br /> 304 East Weber Avenue Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.1. <br /> c Pro ram Manager Douglas W.Wilson,R.E.H.S. <br /> iiad- ` g g Telephone. 209 468-3420 <br /> Laurie A.Cotulla,R.E.H.S. � { � Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> 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(CN'RWQCB)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.I-lenderson,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 /> CVRkVQCB agreed with EFID that after five quarters of sampling since the installation of the northernmost down gradient <br /> monitoring well NM 7 in February 2002,the site is a candidate for"no further action"status. Currently the 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 tert bun'l ether(MTBE) <br /> has been detected in the deep well 2%RV-9 screened from 70 feet to 75 feet at concentrations 58 and 66 pg/1 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 Firrt,Quarterly Report 2001 dated April 25,2001 a mass of 77 grams of dissolved N[TBE left remaining at <br /> the site. The number was based on a 30-foot thick ellipsoidal volume using an average MTBE concentration number-of 100 <br /> µg/l from analytical results of ItIW3,nINV-4,and NRV-6 groundwater samples.This calculation is invalid because the <br /> volume of the MTBE plume appears to be substantially larger since the installation of lIW-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(oorth)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 Heran,RENS,Director <br /> Enviro!Z4, <br /> ealth Department <br /> ;J � L�.tom/ N ,. <br /> Jeffrey Wong,Senior RENS Nuel C.Henderson,Jr.,RG <br /> LOP/Site Mitigation Unit IV IAP/Site Mitigation Unit IV <br /> C C k RWQCB—James L.L.Barton,RG <br /> AGE-Bill Little <br /> ATC—William Shipp <br />