Laserfiche WebLink
r <br /> Ms Margaret Lagono Project 880-040 1A <br /> November 11, 2002 <br /> Page 4 <br /> Groundwater analytical data are presented in Table 1 A TPHg, benzene, and MtBE <br /> concentration map based on the October 7, 2002 data is shown on Figure 2 <br /> I <br /> CONCLUSIONS <br /> Groundwater levels have decreased approximately 0 84 feet since the third quarter 2002 <br /> sampling event Generally, groundwater analytical data for the fourth quarter sampling <br /> event are consistent with the third quarter 2002 results The TBA increase in wells <br /> MW-2 and MW-3 reported in the second quarter 2002 was anomalously high and current <br /> groundwater concentrations have returned to historical levels <br /> RECOMMENDATIONS <br /> On May 22, 2002 a deep boring was installed adjacent to well MW-1 to the total depth <br /> of 54-feet bgs to define the vertical extent of MtBE in soil and groundwater at the site <br /> On May 23, 2002 two monitoring wells (MW-4 and MW-5) were installed at the <br /> locations shown on Figures I and 2 A dual phase extraction test was conducted from the <br /> morning of June 10, 2002 through the morning of June 15, 2002 by <br /> TRC Alton Geoscience, Inc The results of this investigation as well as conclusions and <br /> recommendations for the next phase of work will be included in the Additional <br /> Assessment and Interim Remediation Report <br />' If there are an i <br /> y questions tons regarding the contents of this report, please call David Herzog <br /> at (916) 565-4377 <br /> Sincerely, <br /> GO <br /> SHAW ENVIRONMENTAL, INC � � HE Q, <br /> p <br /> a <br /> No.7211 <br /> r David W Herzog, R <br /> Project Geologist ` � <br /> . � Of: �L\ <br /> SAC IN 1sacDP120021PRJIPJ8188018800401A 2aD doe 021d l <br /> (01070000) <br />