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IT Corporation <br /> 757 Arnold Drive, Suite D <br /> ' Martinez, CA 94553-6526 <br /> t ;� ' "T61 925 370 3990 <br /> ';— . �' Fax'925 370 3991 <br /> the [1 Y� J1"`— ` <br /> APR 14 1999 <br /> A Member of The 1T Group <br /> April1 99 �' <br /> ENVIHUo,,�,ttr <br /> Mr Bob DeNinno <br /> PERMIT / SERVICES <br /> The Southland Corporation <br /> 10220 S W Greenburg Road, Ste 470 <br /> Portland, OR 97223 <br /> Subject First Quarter 1999 Post-Remediation Monitoring and Sampling Report/Request for Closure <br /> Southland Site No 20304 <br /> 455 Grant Line Road <br /> Tracy, California <br /> IT Corporation Project 779960 <br /> Dear Mr DeNinno <br /> This First Quarter 1999 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by the IT Corporation at the subject site (Figures 1 and 2, Attachment 1) on March 17, <br /> 1999 Activities conducted during this reporting period are summarized below <br /> ■ Depth to water(DTW)was gauged in nine groundwater monitoring wells (MW-1 through <br /> MW-6, MW-11, MW-15 and MW-16) and two groundwater extraction wells (GWE-1 and <br /> GWE-2) (Figure 2) <br /> Groundwater samples were collected from all eleven wells and submitted to a certified <br /> ' laboratory for analysis for benzene, toluene, ethylbenzene and xylenes (BTEX), methyl- <br /> tert-butyl-ether(MTBE), total petroleum hydrocarbons-as-gasoline (TPH-G), and the <br /> oxygenates, methyl-tert-butyl ether(MTBE), tert-butanol(TBA), diisopropyl ether(DIPE), <br /> ethyl-cert-butyl ether(ETBE) and tert-amylmethyl ether(TAME) <br /> Closure at this site is indicated based on post-remediation groundwater monitoring data which indicate <br /> hydrocarbon concentrations have declined by up to 96% in the former source area(USTs and associated <br /> piping removed March 1988 Residual hydrocarbon source area excavated April 1998) The remaining <br /> plume is still defined, and dissolved oxygen levels indicate continued ongoing intrinsic biodegradation Also, <br /> ' MTBE has not been detected in any of the existing wells at the site <br /> 1 <br /> ' 20304g499 RPT <br />