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R W RW Am HNIN T _.se, ne ?; " r a # � sy3� �*. ` 'S� a`-+. ` �gCir$rs t�r%" -re a - ' t v x. •^? .-,. >>o ,.r•. - .i t xir.'. - m' '>'w� .a d•` SKE Ir.k i rfMtEtd ASSESSMENT liFPOi[T IHCLUp1HC WATNEMY W"TOr INa FO'O tT 4797 East Ynsemll0 Avenuo,Mantoca,ral]IWA13 2.6 Utlllties Underground utiliiies are present beneath the site. The locations are shown on Figure 3, Prior to beginning fieldwork, Underground 2enrice Alert was contacted and all underground utilities were marked. To prevent drilling through subsurface utilities, the first 5 feet of the borings were advanced by hand augering techniques. 3.0 RESULTS OF INVESTIGATION t� On June 20, 1991, Aegis initiated the installation of three on site monitoring wells (MW-1B, MW-4, and MW-5)at the locations shown on Figure 2. Two soil borings were drilled and four soil samples were obtained for laboratory analysis. Laboratory reports for soli samples collected from the soil borings are included in Appendix C. Monitoring wells MW 4 and MW-5 were installed in the soil borings according to the methods described in Appendix A. 4A Monitoring well MW-1 B was constructed by over drilling existing monitoring well MW-1 A. Logs of the soil borings and monitoring well construction details are included in Appendix B. Groundwater samples were collected and analyzed from monitoring wells MW-113 through MW-5 on June 2.6 and July 22, 1991. Laboratory reports for groundwater samples collected from the wells on July 22, 1991, are included in Appendix C. 3A Soll Condltlons Soil samples obtained during drilling of monitoring well borings MW 4 and MW-5 on June 20, 1991, were described according to the USCS. Soil samples were collected every 5 feet. The monitoring well borings were completed to a total depth of about 35 feet. 6 -A' and B-B.' which were compiled from soil boring data Figure 4 presents cross-sections A collected by Aegis and previous consultants. The locations of the cross-sections are shown on Figure 2. As shown on the cross-sections, the vertical succession of soil types recovered from the t ' borings consisted of a yellowish-brawn fine-to medium-grained silty sand, underlain by fine- •.s to coarse-grained sand which ranged in color from white to dark yellow-brown. The sand was underlain by dark yellow-brown fine-grained silty sand and clayey silt. This was underlain by a silty clay. Beneath the clay was an interbedded L,nit of sands, silts and clays, which extended to the maximum depth explored. ! 3.2 Results of PID Screening PID screening of soil samples was completed according to methods described in Appendix A. Results of PID screening are recorded on the boring/monitoring well logs included in Appendix B. Volatiles were not detected in soil samples collected from the monitoring well --= ------ --i - - ---------borings drilled-by-.Aegis... -. �b 90.090c.RPT •�- :.A - i ,