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April 27, 1999 <br /> Page 3 <br /> CONCLUSIONS <br /> In August 1998, an unknown volume of gasoline was released as a result of overfilling Tank <br /> T-137 IT has reviewed the current groundwater data from wells in the vicinity of Tank <br /> T-137 (Wells MW-3, MW-16, and MW-22) TPH-g, BTEX, and MtBE levels in these wells <br /> were within historic ranges during the first quarter, 1999 sampling event <br /> Based upon the above data, IT will continue to monitor the site on a quarterly basis IT <br /> recommends that all groundwater samples continue to be filtered with a 0 7-macron glass <br /> TCLP filter prior to analysis for TPH-d IT also recommends oxygenate analysis by EPA <br /> Method 8260 be repeated in Wells MW-3 and MW-15 Chevron will attempt to remove the <br /> stockpiled soils covering Well MW-9 to enable sampling of this well during the second <br /> quarter <br /> If you have any questions,please do not hesitate to call us at (916) 858-2350 <br /> Sincerely,' <br /> International Technology Corporation (IT) <br /> OL <br /> Christine W Brown Q ,��'�p <br /> Senior Geologist <br /> D <br /> HG 611 �' <br /> P <br /> Attachments Table 1 - Groundwater El e A F G Analytical Data <br /> Figure 1 - Groundwater Elevation Contour Map, First Quarter 1999 <br /> Figure 2 - TPH-g/Benzene/TPH-d/MtBE Concentration Map - <br /> First Quarter 1999 <br /> Attachment A - Field and Laboratory Procedures <br /> Attachment B - Certified Analytical Reports, Chain-of-Custody <br /> Documentation, and Field Data Sheets <br /> cc Ms Diane Hinson, San Joaquin County Public Health Services, Stockton <br /> Mr John Larkin, Chevron Fuel Terminal, Banta <br /> Mr Tom Bauhs, Chevron Products Company <br /> Ms Tem Barbour, Chevron Products Company <br /> 920-002 2E/IQ99 DOC <br />