ARCHIVED REPORTS XR0003742 - Laserfiche WebLink

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i • Soil Chemical Analytical Data Soil samples collected from Borings MW-9, MW-10, and MW-11 at depths of 11 5 and 16 5 fbg did not contain detectable levels of TPPH, BTEX, and MTBE The soil samples from MW-I 1 did not contain detectable levels of oxygenate compounds Soil chemical analytical data are presented in Table 2 and shown on Plate 4 Certified analytical reports for soils are contained in Appendix C Ground Water Chemical Analytical Data Ground water samples were collected from the newly installed wells (Wells MW-9, MW-10, and MW-1 1) on December 2, 1997 as well as from the rest of the site wells The results of the ground water samples collected from the three newly installed wells are summarized below Ground water samples collected from Wells MW-9, MW-10, and MW-11 did not contain detectable levels of TPPH, BTEX, MTBE, and oxygenate compounds The ground water chemical analytical data are presented in Table 3 and shown on Plate 3 DEEP WELL INSTALLATION One of the phases of the recent investigation included installation of three ground water monitoring wells to monitor the second water bearing zone identified during the October 1997 CPT investigation Two of the wells are located on the subject site and one well is located off-site on the 2452 Country Club Boulevard property Wells MW-12, MW-13, and MW-14 were installed during December 1997 at the locations shown on Plate 2 The procedures for drilling and well installation are detailed below Field Procedures The installation of these three wells involved three phases of drilling The first phase entailed drilling a pilot hole extending though the first water bearing zone and terminating in the fine grained sediments beneath the first water bearing zone The second phase of drilling utilized mud-rotary drilling equipment to install a steel conductor casing in each boring to seal off the first water bearing zone The third phase of drilling was performed with hollow stem auger drilling equipment to drill the borings to their final depths and for installation of the monitoring wells The pilot holes for MW-12 and MW-13 were drilled with a hollow stem auger drilling equipment to depths of 56 and 55 fbg, respectively The pilot hole for MW-14 was drilled with mud-rotary drilling equipment to the depth of 50 fbg The hollow stem auger rig was not used for drilling the pilot hole . for MW-14 because of access issues at the off-site location 240-0783 12