ARCHIVED REPORTS_XR0005187 - Laserfiche WebLink

Home Browse Search

• FOURTH QUARTER, 2002 GROUNDWATER MONITORING REPORT AND ADDITIONAL ASSESSMENT REPORT JAMAR OIL DISTRIBUTION MARCH 2003 According to the CPT data for CPT-2, which was located east of the subject site in the sidewalk in front of the hamburger stand, there are five somewhat distinct hthologic units beneath this part of the investigation area There is an upper, interbedded salt and clay with manor sand unit between 3 and 64-feet bgs, an upper interbedded sand and stiff, fine-grained material unit between 64 and 71-feet bgs, a riddle interbedded silt and clay with minor sand unit between 71 and 100- feet bgs, a lower sand to silty sand unit between 100 and 110-feet bgs, and a lower interbedded silt and clay with minor sand unit that begins 110-feet bgs and extends beyond 122-feet bgs We dad not have enouglihollo Z ods to extend past 122-feet bgs According to the CPT data for CPT-3, which was located southeast of the subject site and south of Main Street, there are four reasonably distinct lithologic units beneath this part of the investigation area There is an upper, interbedded silt and clay with minor sand unit between 3 and 58-feet bgs, an upper interbedded sand and stiff, fine-grained material unit between 58 and 70-feet bgs, a lower interbedded salt and clay unit between 70 and 94-feet bgs, and a lower sand, salt and staff, fine-grained material unit that begins 94-feet bgs and extends beyond 117-feet bgs The CPT boring encountered refusal at 117-feet bgs in CPT-3 There were some technical difficulties between the CPT rod and the CPT computer program whale CPT-3 was being drilled and the data below 60-feet bgs as not as detailed as that for the other two CPT boring logs The CPT logs were analyzed and used to select intervals for collecting soil and groundwater samples from twinned geoprobe borings drilled adjacent to each CPT boring Geoprobe Investigation On January 15-16, 2003, geoprobe borings (HP-1 through HP-3) were installed at the locations shown on Figure 4 The locations were selected to increase understanding of the easterly and southeasterly extent of impacted soil and groundwater, and to provide a basis for locating two additional monitoring wells The geoprobes were advanced to depths of 100-feet bgs an HP-1 and HP-3 and to 104-feet bgs an HP-2 Three soil samples were collected from three different depths and lathologies from each geoprobe boring The different lithologies were identified using the CPT logs The soil samples were used for identification of soil type and for laboratory analysis In HP-1, soil samples were collected from a clayey silt layer at 15-feet bgs, from a silty sand layer at 28-feet bgs, and from a salt layer at 44-feet bgs 6