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k" KLEINFELDER 4.2 SHALLOW SOIL BORINGS Kleinfelder advanced five shallow soil borings on October 22, 1998, within the proposed March Lane Extension between Holman Road and the Southern Pacific Railroad (SPRR). The five borings were advanced to about % foot bgs. Four of the borings were advanced in the orchard area of Blossom Ranch property, and one on the adjacent Sperry property(See Plate 2). A single soil sample was collected from each boring. Each of the five shallow borings were advanced using a hand auger. Soil samples were obtained by slide hammering a 2-inch diameter by 6-inch long stainless steel tube into the soil. The stainless steel tube was then removed from the boring and sealed with TeflonO sheeting and tight-fitting plastic end caps. The hand auger and slide hammer sampler were decontaminated between samples with a Liquinox0 (laboratory-grade detergent) and water wash and a distilled water rinse. These shallow borings were backfilled with the cuttings generated during sampling. Each of the five soil samples were submitted for analyses for selected agricultural chemicals. 4.3 SUSPECT BLOSSOM RANCH USTs 4.3.1 Pre-Field Activities As required by San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD), Kleinfelder submitted a boring permit application and workplan to PHS/EHD for review and approval. The boring/well permit and workplan were approved by PHS/EHD on November 23, 1998 (See Appendix Q. 4.3.2 Drilling Activities On November 23, 1998, two exploratory soil borings were advanced within the building area of Blossom Ranch. The borings were drilled in suspect UST areas noted from a geophysical survey summarized in Section 4.1 and from field observations by Kleinfelder. The borings were installed using a truck-mounted drill rig equipped with 6-inch hollow stem augers. Soil samples were collected at 5 foot intervals beginning at 5 feet for logging purposes and potential chemical analysis. Boring B-1 was located southeast of a cinder block building and boring B-2 was located north of a hulling shed (See Plate 2). Both borings were advanced to a total depth of approximately 30 bgs. To provide a qualitative indication of the presence of volatile organic constituents in the soil and to monitor the constituent concentrations in the drilling crew's breathing zone, a portable organic vapor analyzer was used to screen the samples in the field. The Photovac MicroTip® photo- ionization detector (PID) was used to measure total ionizable compounds in parts per million by volume (ppmv) of vapor. Soil samples obtained were screened in the field, and the PID readings 20-3712-08.E02/2018R1090 Page 7 of 17 ©1998,Kleinfelder,Inc. December 23, 1998