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k'q KLEINFELDER extent of contamination. Rather the work conducted confirmed that contamination existed in "stained and odorous" soils. Kleinfelder was requested by DSS to submit a proposal to collect and analyze soil samples in the location of the AGST in an attempt to assess the extent of the soil contamination. Kleinfelder submitted a proposal entitled "Limited Soil Sampling and Analyses", dated October 27, 1997, to address concerns of potential diesel-affected soil beneath a former AGST. On November 5, 1997, Mr. Doug Heard, a Kleinfelder geologist, visited the subject site. Mr. Mike Infurna of the San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) observed the collection of soil samples. The farmhouse and associated structures were found to be recently removed. However, DSS had provided Kleinfelder with a large detailed map of the farmhouse area showing the location of the AGST. Distances from an existing septic tank and agricultural irrigation well were used to locate the former location of the AGST (See Plate 1). Soil staining and a diesel like odor were noted in this area. The soil staining was estimated to be 10 feet in diameter or less. Four borings were hand augered in and around the stained soil. Three soil borings were advanced around the perimeter of the stained soil to an approximate depth of 10-feet below surface grade (bsg). A single soil boring was advanced in the central portion of the stain, to a total depth of approximately 14-feet bsg. No obvious hydrocarbon-like odor was noted in soil collected from the perimeter borings. A strong to moderate hydrocarbon-like odor was noted in soils collected at depths of 2, 5 and 10- feet bsg. in the boring advanced in the central portion of the stained soil. However, no obvious odor was noted from a soil sample collected from this boring at approximately 14-feet bsg. An organic vapor analyzer (OVA) was used to screen the soils from the four soil borings. Soil screening of soil collected at 5 and 10-feet bsg in the three perimeter borings showed readings of less than 1 part per million by volume (ppmv) ionizable compounds in the air. Soil screening of samples collected from the fourth boring (within the stained soil) at depths of about 2, 5, 10 and 14-feet bsg showed OVA readings of 50.1, 24.6, 17.5, and 4.0 ppmv, respectively. Based on the field observation, Kleinfelder recommended to remove and stockpile the stained soil and collect confirmation soil samples from within the excavation. The recommendation was approved by Mr. Randy Bling of DSS and Mr. Infurna of the PHS/EHD. Kleinfelder submitted a second proposal entitled "Soil Excavation Observation, Sampling, and Analyses ...", dated November 6, 1997 and subsequently authorized by DSS and approved by PHS/EHD. This report summarizes Kleinfelder's findings. 20-2245-32.E0I2017R720 Page 2 of 5 © 1997, Kleinfelder, Inc. November 18, 1997