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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 <br /> 209/468-3420 <br /> JOE ALDRIDGE <br /> BILE COPY <br /> ULTRAMAR INC <br /> PO BOX 466 JUL 3 � 1998 <br /> 525 W THIRD ST <br /> HANFORD CA 93232 <br /> RE: Beacon #474 SITE CODE: 1173 <br /> 3440 E. Main Street <br /> Stockton, CA., 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has reviewed the June 16, 1998 "First Quarter 1998 Ground Water <br /> Monitoring Report" and "Work Plan For A Remedial Investigation" submitted by <br /> Horizon Environmental on June 29, 1998 and has the following comments. <br /> As this site prepares to enter into a remedial investigation, it is important that <br /> groundwater quarterly monitoring reports are submitted on time (prior to the next <br /> monitoring event). In addition, quarterly monitoring reports should be submitted <br /> with adequate time to allow PHS-EHD to review the data so that any <br /> modifications required may be incorporated in the next sampling event. Please <br /> adjust your scheduling for the quarterly events at this site so that this <br /> requirement can be met and please continue to contact Michael Infurna to <br /> schedule the sampling inspections forty-eight hours prior to the proposed work <br /> performance. <br /> At this time, only groundwater samples from monitoring wells #2 and #6 (MW-2 & <br /> 6) are showing BTEX as well as Total Petroleum Hydrocarbons as Gasoline <br /> (TPH-G) in the groundwater. Currently water is above the screened interval of <br /> MW-2 and the Benzene concentration in the groundwater sample from MW-6 is <br /> twenty times higher than the Benzene concentration in MW-2. Only low levels of <br /> TPH-G were detected in the groundwater from the other monitoring wells (Mws <br /> 1, 3, & 8). This condition leaves only MW-6 to provide groundwater samples <br /> from current vadose/saturated zone interface that contain Benzene. t <br /> Vapor wells #1 and #4 (deepest of three casings in each vapor well) have <br /> groundwater in them at this time and are located closer to the groundwater <br /> plume than the other monitoring wells on site. PHS-EHD will require all vapor i <br /> i <br /> A Division of San Joaquin County Health Care Services <br />