COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

k'q KLEINFELDER 4 PUSH PROBE ASSESSMENT 4.1 PERMITTING AND PREFIELD ACTIVITIES An approved (push probe) boring permit was obtained prior to initiating the field activities through San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD). The site was marked for utilities and Underground Services Alert (USA) was contacted prior to field activities. For a copy of the well/boring permits,please refer to Appendix D. 4.2 FIELD ACTIVITIES On May 4`" 2004, Kleinfelder performed a push probe assessment at the subject site. Advancement of ten of eleven probes locations were conducted by Enprobe of Oroville, California. The remaining probe (PP-8) was advance by Kleinfelder using a hand-auger due to inaccessibility. The pushprobes were placed in proximity to the six ASTs, discharge areas, near surface pumps, sump area and subsurface piping associated with transmission and discharge of the stored fertilizer solution (See Plate 2). Seven of the eleven probes (PP-1, PP-2, PP-3, PP-4, PP-8, PP-10 and PPP-11) were located in perimeter locations in proximity to the six ASTs. The greatest concentrations of probes were positioned near AST No. 2, which appeared to be an older tank and was an area of concern by visual observation. Pushprobe PP-6 was positioned near a surface pump; PP-5 was located near a discharge truck loading area; PP-7 was located near a square sump-like structure; and PP-9 was advanced near the location of a subsurface transmission line which has historically transported product to boats/ships in the nearby port area (delta). The eleven push probes were advanced to approximate total depths that ranged between 10 and 16 feet bgs. Groundwater was encountered between approximately 9 and 12 feet bgs. During the advancement of the push probes, Kleinfelder collected soil samples for logging purposes and potential chemical analysis (See Appendix A). Unusual fertilizer like odors were noted in borings PP-1 (10 to 15 feet bgs),PP-2 (8 to 10 feet bgs), PP-5 (4 to 12 feet bgs), PP-7 (8 to 16 feet bgs), and PP-8 (near surface to 10 feet bgs). A petroleum odor was noted in boring PP-10 , from approximately 10 to 15 feet bgs. Soil were noted as primarily sand and silty sand from near surface to depths ranging from 5 to 10 feet bgs underlain by silty clays and clays in the bottom portion of most probe locations. For specific details of observation made during boring activities, refer to pushprobe soil logs located in Appendix A. A total of 22 soil samples were submitted for analysis collected at depths ranging from 20 inches to 15 feet bgs, including both the vadose zone and estimated capillary fringe area. Two soil samples were submitted for analyses from nine probe locations, and one and three soil samples from two probe locations. For details of the sample locations and depths please refer to Table 1. 43851.E01/ST05R158/DH:Iv Page 5 of 12 02005,Kleinfelder,Inc. February 9,2005