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Date' May 25, 1989 Fie/; 402.331 <br /> To. ENVIRONMENTAL, SERVICES <br /> From: TECHNICAL AND ECOLOGICAL SERVICES <br /> Subjd April 1989 Groundwater Monitoring Sampling Results- <br /> Tracy Service Center <br /> ROBERT C KARFIOL. <br /> Groundwater samples were collected on April 25, 1989 by the Technical and <br /> Ecological Services' Water Resources Unit from six groundwater monitoring <br /> wells (OW-1 through OW-6) located at PG&E's Tracy Service Center. The <br /> service center is located at 502 East Grantline Road in Tracy The <br /> monitoring well locations are indicated on the attached site map <br /> The groundwater samples were analyzed by Eureka Laboratories of Sacramento, <br /> California for total petroleum hydrocarbons (modified EPA method 8015) <br /> aromatic volatile organics (modified EPA method 602) , and total lead (EPA <br /> method 200.7) within allowable holding times. Travel blank and method <br /> blank samples were analyzed by the same methods for quality control. A <br /> copy of the laboratory data sheets is enclosed <br /> Lead was not detected in any of the monitoring well samples. Well OW-2 was <br /> the only monitoring well which had detectable amounts of petroleum hydro- <br /> carbons or aromatic volatile organics This is consistent with the <br /> analytical results from the previous sampling effort performed in <br /> December, 1988 <br /> Table 1 shows the laboratory results for groundwater samples collected from <br /> well OW-2 in April 1989 Laboratory results for groundwater samples <br /> collected in January 1988 and December 1988 are also provided for <br /> comparison Gasoline hydrocarbons were detected in the samples collected <br /> from well OW-2 in April 1989 at 1 2 milligrams per liter <br /> was detected at 1540 micrograms per liter (u (mg/1) , benzene <br /> gwas <br /> at 95 ug/1, toluene was detected at 22 ug/l, and�Xylenes e ereedetectedeated <br /> 11 ug/1 <br /> Water level measurements collected in April 1989 suggest that the hydraulic <br /> gradient at the site is relatively unchanged, and groundwater in the upper- <br /> most water-bearing zone beneath the site continues to flow north-northeast <br /> Please call me if you have questions concerning this data, or require <br /> additional work at the Tracy site <br /> ERIC P JOHNSON <br /> EPJ(251-5888)epj <br /> 4698a/BAV128 <br /> cc APConner LEMcMillan <br /> EMKenzler <br /> 62 6218(rev 3 88) <br />