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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY U„;rs„pervisars <br /> Carl Bor;an,R.E.H.S. <br /> venue,Third Floor ins,R.E.H.S.,R.D.I. <br /> R.E.H.S. 304 East Weber A Mike Hugg <br /> Donna K.Heron, Douglas W.Wilson,R.E.H.S. <br /> Director Stockton, California 9 8-342 708 Margaret Lagorio,R.E.H.S. <br /> ” 468 3420 <br /> At Olsen,R.E.H.S. <br /> Program Manager. Telephone: (209) Robert McClellon,RE.H.S. <br /> gip• 464-0138 Ma Bar cellos,R.E.H.S. <br /> • c9(,'F�R?` Laurie A.Cotulia,R.E.H.S. Fax: (209) SEP 2 2002 <br /> program Manager <br /> Mr. Jeffery SetneSS B <br /> Mike Wallace ment <br /> 2453 Grand Canal, 2n” F1 <br /> City <br /> of Stockton Redevelop Stockton, CA 95207-8259 <br /> 305 North E1 Dorado,95202Suite 20 <br /> Stockton, CA <br /> RE: FORMER CHASE CHEVROLET FACILITY 423 MADISON <br /> 424 VAN BUREN STOCKTON,CA 95201 <br /> STOCKTON,CA 95201 <br /> Since removal of the underground storage tanks (UST) at the two above-referenced sites in <br /> 1989,a total of 27 monitoring wells have sites. Earliest analytical <br /> been installed onwell dated back to September <br /> had been conducted since 1992. Concentrations of <br /> results of groundwater samples collected from a monitoring <br /> 1990,and continuous quarterly sampling <br /> groundwater samples have either fallen or stabilized over the years; <br /> contaminants m be attributed to the rise of groundwater and drowning <br /> however, some of the reduction may <br /> of monitoring well screen. (Table 1) Hg) of MW6, <br /> Table 1: Analytical Results of Total Petroleum Hydrocarbons as Gasoline (fP <br /> MW-7,MW-1,MW-4 MW-1 MW-4 <br /> MW 6 MW-7 20' to 45' <br /> Sate le location 20' to 45' 19' to 46' <br /> 20' to 45' 5,800 710 <br /> Screen len th 12,000 21,000 <br /> 02/27/92 results/ 27.32'bs 28.27'bs <br /> De th to Groundwater 27.73'bs 28.08'bs 1,300 ND <50 <br /> 5100 21. ' 21.42'bs <br /> 11/06/96 results/ 21.31'bs 21.46' bs ND <50 <br /> De th to Groundwater 830 8'bs 6,700, 850 <br /> 02/05/97 results/ 16.33'bs 16.30'bs <br /> De th to Groundwater 16.03'bs 16.25'bs ND <50 <br /> 96 160 ND <50 16.70'bs <br /> 05/16/02 results/ 16.82'bs <br /> De th to Groundwater 16.46'bs 16.70'bs <br /> All results in micrograms per liter (µg/1) <br /> During a meeting at the Advanced GeoEnvuonmental,Inc. (AGE) office nStockton HD and <br /> Of eve monitoring well is neither <br /> September 25,2002,San Joaquin County Environmental Health Departrn (E <br /> AGE agreed that continuous quarterly sampling <br /> very <br /> necessary nor cost-effective, <br /> monitorin wells with hihistorically non-detectable schedule beadjusted <br /> concentrationsslocated <br /> Annual sampling g of <br /> in an:upgra ient wells with consistent onson or not in the critical istent <br /> historically positive contaminant concenuations,gand 3) <br /> monitoring <br />