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PUBLIC HEALTHSERVICES <br /> SAN JOAQUIN COUNTY G� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer ' . <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> ro y <br /> 9 (a <br /> WILLIAM WATKINS JAMES PAIL <br /> 1115 BEELARD DRIVE 1807 DOUGLAS ROAD <br /> VACAVILLE CA 95687 STOCKTON CA 95207 <br /> MAR 16 2000 <br /> RE: PAIGES TOWING SITE CODE: 10781 <br /> 1807 DOUGLAS <br /> STOCKTON CA 95207 <br /> Four monitoring wells (MW) were installed at the above referenced site on April 8, 1999. Analytical <br /> results of three quarters of MW samples were all non-detect (ND) at G 0.5 parts per billion (ppb) of <br /> aromatic hydrocarbons as benzene,toluene, ethyl-benzene, and xylenes, ND at <50 ppb of Total <br /> Petroleum Hydrocarbon as gasoline (TPH-g), and ND at C 1 ppb (ND at G 2 ppb for the July 1999 <br /> sample from MW-2) of tertiary amyl methyl ether(TAME),di-isopropyl ether{RIPE), and ethyl <br /> tertiary butyl ether (ETBE). However, analytical results of groundwater samples from MW-2 fluctuated <br /> from 1.9 ppb of methyl tert butyl ether (MTBE) in April 1999, to 45 ppb in July 1999, and 1.7 ppb in <br /> October 1999. <br /> In a telephone conversation on January 28, 2000,your consultant Advanced GeoEnvironmental,Inc. <br /> (AGE) notified San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) of your request to reduce the frequency of the MW groundwater sampling and reporting <br /> from a quarterly to a biannual basis. The request is not approved at this time. Quarterly Report - <br /> October 1999 prepared by AGE concluded that "very Iow concentrations of dissolved MTBE appear to <br /> be present near the area of MW-2, but does not account for the rise of MTBE concentration reported in <br /> Quarterly Report-July 1999. Seasonal fluctuation,local pumping influence, and other factors could <br /> be involved in the large changes of MTBE concentration. PHS/EHD directs continuing monitoring on <br /> a quarterly basis at this time. <br /> PHS/EHD concurs with AGE's recommendation that additional work is required to delineate the <br /> plume northwest and southeast of the former fuel dispenser area and the MTBE plume northeast and <br /> east of MW-2. A well survey must be conducted and all wells within a 2000 foot radius of the site <br /> should be identified and the location shown on a map of the area. Any known construction details of <br /> the wells identified should also be provided. This information should be submitted with the work plan <br /> to PHS/EHD by April 1, 2000. If you have any questions, please feel free to contact Jeffrey Wong at <br /> (209) 468-0335. <br /> Donna Heran, REHS,Director <br /> Environmental Health Division <br /> Jeffrey Wong, REHS Margaret L orio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region-Marty Hartzell <br /> c: Advanced GeoEnvironmental,Inc. -Tim Cuellar <br /> A Division of San Joaquin County Health Care Services <br />