ARCHIVED REPORTS_XR0010310 - Laserfiche WebLink

Home Browse Search

/> IVI April 22, 1998 CE - -� Michael Infurna, Sr REHS '� f? 199$ San Joaquin County PHS , Environmental Health DivisioniE ; ' ' �`'! ► TH P O Box 388 PER+�r! S RVI'O--3 Stockton, CA 95201-0388 Re First Quarterly 1998 Groundwater Monitoring and Sampling Report, (former Canteen facility) 1500 Shaw Road, Stockton, CA, Site Code 1727, AES Project No 145-94009-01 Dear Mr Infurna This report summarizes the monitoring and sampling event conducted on January 28 and 30, 1998 Field activities at the above referenced site included monitoring of fluid Ievels and collection of groundwater samples from eight monitor wells onsite and five off site monitor wells on the former U S Chemical property (Figure 1) The depth to groundwater ranged from 50 73 feet to 58 28 feet below grade Free product was not measured in any of the monitor wells Based on the groundwater elevations from the monitor wells, the apparent groundwater gradient was 0 37 feet per 100 feet and the general direction of groundwater flow was to the south Fluid level measurements are summarized in Table 1 and the Potentiometric Surface Elevation Contour Map is included as Figure 1 The gauging datum for monitor well MW-10 was not incorporated into the gradient map for January 30, 1998 Historically the groundwater elevations in MW-10 are approximately the same as that in MW-3A, however for January 30, 1998 the data indicates that the elevation for MW-10 was approximately five feet lower than that for MW-3A It appears that the gauging data for MW-10 was not correct Copies of the field data sheets and water measurement data are included in Appendix A The only BTEX constituent detected above California MCLS was benzene in well M*N'-2 ( 8 µg/L) and MW-10 ( 11µg/L) MTBE was detected in wells MW-3 and MW 3A at concentrations of 18µgIL and 211tg/L, respectively 2833 Trinity Square, Suite 149 • Carrollton, Texas 75006 • Tel (972) 416-7171 • Fax (972)416-7175