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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 `'fi6Oii <br /> 209/468-3420 � <br /> WILLIAM WATKINS JAMES PAIGE <br /> 654 RIALTO 7444 LIGHOUSE DRIVE <br /> VACAVILLE CA 95687 STOCKTON CA 95219 <br /> FEB 112000 <br /> -. ---�____BgE: --_PAI ES 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 <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 <1 ppb (ND at <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 (ETRE). 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 low 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,RENS,Director <br /> Environmental Health Division <br /> 6 ' <br /> effre Won RE.HS Mar ares a orio REH <br /> J Y g� g g <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 />