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1 <br /> Ms Vicki McCartney Project No 880-040 1A <br /> January 30, 2004 <br /> Page 4 <br /> 1 <br /> DISCUSSION <br /> Groundwater levels have increased approximately 0 79 foot since the fourth quarter <br /> 2003 sampling event Groundwater analytical data for the first quarter 2004 sampling <br /> event are consistent with historical data Since groundwater monitoring began in <br /> September 2000, MTBE concentrations have declined in all wells, while TPA <br /> concentrations have concurrently increased in some wells (MW-4 and MW-5) This <br /> reciprocal relationship between MTBE and TBA concentrations may indicate intrinsic <br /> degradation of MTBE Shaw recommends continued monitoring of the existing five <br /> wells (MW-1 through MW-5) to further evaluate the dissolved hydrocarbon plume at the <br /> site <br /> If there are any questions regarding the content of this report, please contact Mr Herzog <br /> at (916) 565-4377 <br /> Sincerely, <br /> SHAW ENVIRONMENTAL, INC LO�NO <br /> r �Y No.7299 <br /> Ed Simonis, R G David W Her og a 2 G <br /> Senior Geologist Project Manager 'q ' OF £�`��p@`� <br /> Attachments Table 1 —Groundwater Analytical Data <br /> Figure 1 — Groundwater Elevation Contour Map, First Quarter 2004 <br /> Figure 2 —TPHgBenzene/MTBE Concentration Map, First Quarter 2004 <br /> Attachment A--Field And Laboratory Procedures <br /> Attachment B —Certified Analytical Reports, Cham-of-Custody <br /> Documentation, and Feld Data Sheets <br /> cc Mr Jim Parkinson, 3250 West Hammer Lane, Stockton, California <br /> . Mr James Barton, CRWQCB, 3443 Routier Road, Suite A, Sacramento, California <br /> Shaw Environmental,Inc <br /> N IsacDP120041Prj18W8800401 A 4aa doe <br />