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E KLEINFELDER F Service, Department of Environmental Health Division (PHS/EHD) had requested that B&B Equipment Company submit a workplan to evaluate the lateral and vertical extent of ; contamination. Kleinfelder submitted a proposal titled "Proposal/Cost Estimate, Limited Soil 1 Sampling and Analysis, Former Underground Storage Tank, B&B Equipment Company, 3132 Farmington Road, Stockton, California, dated May 14, 20.01 to assess the specific concerns described above. Mr. Bywater requested a change of scope to this proposal. The original scope of work included utilizing push probes in and around the UST area to assess soil conditions. Mr. Bywater requested that Kleinfelder submit a workplan using a backhoe instead of push probes. Kleinfelder submitted an addendum to our original proposal to PHS/EHD titled "Addendum to Proposal YP1-568 dated May 14, 2001, Limited Soil Sampling And Analysis", dated July 23, 2001. PHS/EHD approved the proposal/workplan and the addendum. The following is a summary of Kleinfelder's findings of our field activities, which commenced on September 20, 2001, FIELD ACTIVITIES 9 Mr. Doug Heard, Project Geologist for Kleinfelder visitedthe site on September 20, 2001 to collect soil samples near the former UST area for evaluation of potential fuel constituents. The former UST area was indentified by Mr. Bywater, owner of the site (Plate 1). s Soil SaMPIW2 't Mr. Bywater and Margaret Lagorio, unit supervisor for PHS/EHD, were present at the site. A trench measuring approximately 2' by 17' by 12 feet deep had been previously excavated through the middle of the reported UST area by Mr. Bywater. The trench and former UST area were located just north of a maintenance garage along the eastern property boundary. The trench revealed what appeared to be the tank backfill, which consisted of a dark brown gravelly clay. Native material surrounding the backfill was a brown silt ' clay. The backfill material was approximately 5 1/2 feet deep and about 5 feet wide. Some debris including wire and plastic bags were noted in this backfill area. Discolored soil or soil with a petroleum odor were not noted during the sampling activities, although a slight petroleum odor was noted from the stockpiled soil. Soil stockpiled from the trench had been placed adjacent and west of the UST area. E; A total of four discrete soil samples were collected from within the trench area, three sidewall samples and one bottom sample (below the tank backfill.) 1 A pre-cleaned stainless steel hand auger was used to advance a small hole an additional 6 inches in depth from within the trench prior to collecting each discrete soil sample. A four-point composite sample was collected from the stockpiled soil. The sidewall samples were collected at depths ranging from 3 to 5 % feet bgs along the northern, western and eastern sidewalls. A bottom sample was collected below the tank backfill area at a depth of approximately 12-feet Discrete soil samples were collected by slide hammering a 2-inch diameter by 6-inch long stainless4 steel tube into the soil. Sampling locations are illustrated on the attached Plate 1. A single four-point composite sample was also collected from approximately 15 yards of the excavated stockpiled soil located west of the UST area. The composite soil sample was collected by pushing a pre-cleaned stainless steal tube into the soil by hand. 20-4659-0 k.EO 1/2011 R1442 i Page 2 of 6 a 2001,Kleinfelder,Inc. November 28,2001 ;i f`