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Union Ice Company minion Street, Stockton "r <br /> Re-excavation Work Plan & Installation of Additional Monitoring Wells <br /> Page 3 <br /> Total lead was analyzed for the samples collected at the 20, 40 and 55 <br /> foot levels in the boring and all of the samples were "none detected" <br /> (Appendix A). <br /> 4.0 PROPOSED INSTALLATION OF ADDITIONAL <br /> MONITORING WELLS <br /> This investigation includes the placement of two (2) four inch (4") groundwater moni- <br /> toring wells to determine the groundwater gradient and to further define the <br /> — groundwater conditions at this site. One (1) well will be placed in the west end of the <br /> property, and the other well will be placed off site, in the park- across the street, which <br /> is to the east of the site (Figure 2). The gradient from a site on Park Avenue is to the <br /> northeast; the gradient is believed to be further east on Union Street, so a monitoring <br /> well would have to be placed off site in order to be down gradient. An encroachment <br /> permit will be obtained from. the City of Stockton before work commences. <br /> Groundwater, at this site, is currently at approximately 62 feet; therefore, the wells will <br /> be terminated at approximately 75 feet. The Sampling Protocol is in Appendix B of this <br /> Work Plan. <br /> — 5.0 RESIDUAL CONTAMINATION (Farmer Tank #3) <br /> The water sample taken on March 13, 1992, from MW-1 was "none detected" for the <br /> 602 compounds kTTXE) and TEPH (kerosene, diesel and motor oil). The sample taken <br /> on June 23, 1992, was "none detected" for all compounds except for 16.2 mgll for <br /> — motor oil. <br /> It is recommended that quarterly sampling be done for three (3) more quarters. if these <br /> samples and the samples from the other two (2) wells to be installed are "ND", then the <br /> ;yells should be destroyed. <br /> 6.0 PROPOSED RE-EXCAVATION (Former Tank #4) <br /> The purpose of the proposed re-excavation is to remove as much of the contaminated <br /> soil as possible in order to reduce the potential impact to the groundwater table. This <br /> area of the former waste oil tank is at the northwest end of the property, next to the <br />