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ENVIRONMENTAL HEALMDEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K. Heran, R.E.H.S. Carl Ber man, R.E.H.S. <br /> a, 304 East Weber Avenue, Third Floor g <br /> Director" 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.}LS. <br /> Progra,n Manager Telephone: (209) 468-3420 Margaret Lagorio, R.E.H.S. <br /> 9CIFORc� _ <br /> Laurie A. Corona, R.E.H.S. Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Program Manager _ Mark Barcellos, R.E.H.S. <br /> GUARDINO AND CRAWFORD JUN 2 12004 <br /> 517 W FREMONT ST <br /> STOCKTON CA 95201 <br /> RE: GUARDINO AND CRAWFORD SITE CODE: 1112 <br /> 517 W Fremont St, <br /> Stockton CA 95201 <br /> San Joaquin County Environmental Health Department (EHD) has not received any <br /> quarterly sampling report since Quarterly Report - ThirdQuairer 2003 dated October 20, 2003 <br /> prepared by your consultant, Advanced GeoEnvironmental, Inc. (AGE) . In a telephone <br /> conversation on June 15, 20043 AGE stated the quarterly reports for 41h quarter 2003 and 1st <br /> quarter 2004 are not complete. The laboratory analytical results corresponding to these <br /> outstanding reports have also not been submitted electronically to GeoTracker— the State <br /> Water Resources Control Board database program. <br /> As a responsible party, you are required to submit quarterly sampling reports to EHD on a <br /> timely basis . You should endeavor to submit a. quarterly sampling report within 45 days after <br /> sampling. EHD directs the two above-mentioned outstanding quarterly reports be <br /> submitted to EHD by July 1, 2004. You are also directed to initiate electronical submission <br /> of laboratory analytical results to GeoTracker. <br /> The above-mentioned Quarter Report — ThirdQuarter2003 reported a rise in concentrations of <br /> all four aromatic hydrocarbons (BTEl and methyl tert-butyl ether (MTBE) in monitoring <br /> well MW-1 compared to the two previous quarters in 2003, but remained relatively <br /> consistent compared to the previous 4 years of sampling. Analytical results of benzene were <br /> 4,400 micrograms per liter (ug/1) and of MTBE were 63 ug/1. Concentrations of <br /> contaminants in MW-2 have continued to drop, with analytical results of 4.1 ug/1 benzene, <br /> and non-detect for MTBE. Analytical results of groundwater samples from the four <br /> remaining wells MW-3 to MW-6 were non-detect for all contaminants tested. Groundwater <br /> flow direction has been consistently calculated as northwest. AGE concluded the <br /> contamination plume to be confined to the general area around MW-1 and 1VIW-2, and <br /> recommended preparation of a corrective action plan. <br /> The vertical extent of the contamination plume has not been defined. EHD does not agree <br /> that a correction action plan is appropriate at this time. The deepest groundwater samples <br /> were the grab groundwater samples obtained from boring P9 at 35 feet below surface grade <br /> (bsg), and P10 at 40 feet bsg in November 2000. Analytical results of the P9 sample were <br /> 35,000 ug/1 of Total Petroleum Hydrocarbons as gasoline (IPH-g), 380 ug/1 of benzene, <br /> and 21 ug/1 of MTBE, and results of the P10 grab water sample were 760 ug/1 of TPH-g, <br />