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Mr Sam Savig Project 880-040 IA <br /> June 12, 2002 <br /> 1 Page 4 <br />' CONCLUSIONS <br /> Groundwater levels have increased 0 09 feet since the first quarter 2002 sampling event <br /> Generally, groundwater results showed a decrease or stable TPH-g, BTEX, and MtBE <br /> concentrations trend for the three wells The TBA increase for MW-2 and MW-3 was <br /> anomalously high and will be reviewed next quarter for confirmation <br /> rRECOMMENDATIONS <br /> A work plan was approved by SJCEHD to define the vertical and lateral extent of soil <br /> and groundwater contamination and implement interim remedial measures to control the <br /> off-site MtBE migration Installation of two down gradient wells and the completion of <br /> a dual phase extraction test is scheduled for the second quarter 2002 <br /> If there are any questions regarding the contents of this report, please call <br /> Kathleen Waldo at (916) 565-4370, or Sue Kraemer at(916) 565-4180 <br /> Sincerely, <br /> SHAW ENVIRONMENTAL & INFRASTRUCTURE, INC <br /> r <br /> Kathleen A Waldo Sue Kraemer, CEG 1666 <br />' Staff Engineer Senior Geologist <br /> Attachments Table i —Groundwater Elevation and Analytical Data <br /> Figure 1 —Groundwater Elevation Contour Map, Second Quarter 2002 <br /> Figure 2 —TPH-gBenzene/MtBE Concentration Map, Second <br /> I Quarter 2002 <br /> Attachment A—Field And Laboratory Procedures <br /> Attachment B— Certified Analytical Reports, Chain-of-Custody <br /> Documentation, and Field Data Sheets <br /> cc Mr Jim Parkinson, 3250 West Hammer Lane, Stockton, California <br />' ha <br /> SAC IN franc£p11Projeds\Projeds1880104011a10107120021880040_2g02 doo-021R 1 Sw Environmental&lnfrastructirre,Inc <br /> (01070000) <br /> r <br />