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' Diamond Lumber-Lodi Quarterly Groundwater Monitoring Page 5 Identification ("SRK-MWI-LODI"). The top of the chain-of-custody form clearly states the name and address of ACZ Laboratories in Steamboat Springs, Colorado. Table 2 includes all of the available groundwater data for the monitoring wells installed by SRK in 1991. ' TABLE 2: Analytical Groundwater Data a�tdyetiw€et25,19'91.,,.. Apni,7,199 ., Scp[sno6cr 2;3992..i ...Pebnsry41�?�:i. . 5Ri 5R)<iK :$RiC SttK 'Sits SR1C SRIF SEtK SR3C ,. SRIF SRK Sltltr INVTl „ MWx M1V3 MRTI MW1. ' MR!3' 11�W1' 11dV1r2 ;.MW3 Volatile Hydrocarbons <50 <50 <50 <50 <50 <50 <20 NS <20 120 <20 120 Benzene <0.5 <0.5 <0.5 <05 <03 <0S <0.5 NS <03 <0.3 0.3 <0.3 Toluene <0.5 0.82 0.63 <0S <0.5 <0.5 <0.5 NS <QS <0.3 <0.3 <0.3 Ethylbenzent <0.5 <05 <OS <0.5 <OS <D5 <05 NS <OS <03 <0.3 y63- +� Xylenes <0-5 <0-5 <0S <0.5 <0.5 <0-5 <0S NS <0.5 <0.3 <0.3 0,7'~ � Lead 53 <0.5 <0.5 33 260 93 12 NS 170 3 69 122 NCqM- NS = Not sampled'because of slow recharge after purging resulting in an insufficient quantity of water necessary for sampling. ND = Analytes reported as ND were not present above detection limits. ' All units in ppb. The constituents of BTEX were detected at levels slightly greater than the method detection limit (MDL) in two of the three SRK monitoring wells (SRK-MW2 and SRK-MW3), while BTEX was not detected in SRK-MW1. Benzene was only detected in SRK-MW2 at 0.3 ppb, while ethylbenzene (0.7 ppb) and xylenes ( 0.4 ppb) were detected in SRK-MW3. Volatile hydrocarbons were not detected any of the three monitoring wells. Lead was detected in each well ranging from 3 ppb in SRK-MWI, 69 ppb in SRK-MW2, and 122 ppb in SRK-MW3. 6.0 REGULATORY SITE VISITS 't Ms. Margaret Lagorio, Senior REHS with the San Joaquin County PHS/EHD was on-site during the sampling of the three monitoring wells and during soil spreading activities. No verbal or written comments were made by the PHS/EHD during or immediately after the site inspection. 7.0 SOIL SPREADING On behalf of the 650 Management Corporation, SRK requested and was granted permission from the PHS/EHD to dispose of non-contaminated soil generated during SRK's soil boring/monitoring well t installation (November 1991). A copy of the written authorization from the PHS/EHD is provided in Appendix F. A total of 7 drums of soil were spread on-site over a non-asphalt area presumed to be the former location of the UST removed in 1985 (see Figure 1). The empty drums, including 2 drums Steffen Robertson and Kirsten