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ENVIRONMENTAL HEALTH DEPARTMENT i PQUIN - . SAN JOAQUIN COUNTY Unit Supervisors Donna K. Heran, R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman, R.E xs. Director Mike Huggins, R E H.S., R.D.I. m. Al Olsen, R.E.H.s, Stockton, California 95202-2708 Douglas W. Wilson, R.E.H.S. ProgramManager er g Telephone: (209) 468-3420 Margaret Lagorio, R.E.H.s. gCiFO R� Laurie A. Cotulla,R.E.H.S, 138 Robert McClellon, R.E.H.S. Program Manager Fax: (209) 4 �-0eMark Barcellos, R.E.H.S. GUARDING AND CRAWFORD IECEI g64�TEi JUN 2 12004 517 W FREMONT ST. m STOCKTON CA 95201 JUN 17 2 !404 RE: GUARDINO AND CRAWFORD SITE CODE: 1112 517 W Fremont St. Stockton CA 95201 San Joaquin County Environmental Health Department (EHD) has not received any quarterly sampling report since Quarterly Report - ThirdQuarter 2003 dated October 20, 2003 prepared by your consultant, Advanced GeoEnvironmeraml, Inc. (AGE) . In a telephone conversation on June 15, 2004, AGE stated the quarterly reports for 41hquarter 2003 and 1'r quarter 2004 are not complete. The laboratory analytical results corresponding to these outstanding reports have also not been submitted electronically to GeoTracke. the State Water Resources Control Board database program. As a responsible party, you are required to submit quarterly sampling reports to EHD on a timely basis. You should endeavor to submit a quarterly sampling report within 45 days after sampling. EHD directs the two above-mentioned outstanding quarterly reports be submitted to EHD by July 1, 2004. You are also directed to initiate electronical submission of laboratory analytical results to GeoTracker. The above-mentioned Quarter Report — Third Quarter2003 reported a rise in concentrations of all four aromatic hydrocarbons (BTEX) and methyl tert-butyl ether (MTBE) in monitoring well 1ViW-1 compared to the two previous quarters in 2003, but remained relatively consistent compared to the previous 4 years of sampling. Analytical results of benzene were 4,400 micrograms per liter (ug/1) and of MTBE were 63 ug/L Concentrations of contaminants in MW-2 have continued to drop, with analytical results of 4. 1 ug/1 benzene, and non-detect for MTBE. Analytical results of groundwater samples from the four remaining wells MW-3 to IVIW-6 were non-detect for all contaminants tested. Groundwater flow direction has been consistently calculated as northwest. AGE concluded the contamination plume to be confined to the general area around MW-1 and MW-2, and recommended preparation of a corrective action plan. The vertical extent of the contamination plume has not been defined. EHD does not agree that a correction action plan is appropriate at this time. The deepest groundwater samples were the grab groundwater samples obtained from boring P9 at 35 feet below. surface grade (bsg) , and P10 at 40 feet bsg in November 2000. Analytical results of the P9 sample were 35,000 ug/1 of Total Petroleum Hydrocarbons as gasoline (TPH-g), 380 ug/1 of benzene, 'i and 21 ug/1 of MTBE, and results of the P10 grab water sample were 760 ug/1 of TPH-g, i 'r