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�1 August 5, 1997 38737 001 Harding Lawson Associates Ms Mary Meays San Joaquin County Public Health Services Page 3 TVG submitted a workplan (TVG, 1995) to address issues raised by PHS/EHD The scope of work consisted of the following ♦ Advance three geoprobe-style borings in the area between SB-1 and SB-7 to depths of 20 feet bgs ♦ Collect soil samples at minimum 5-foot intervals in each boring Collect two hydropunch-style groundwater samples from each boring, • One at the beginning of saturated soils(6-10 feet bgs), and • One at hole termination of 20 feet bgs ♦ Analyze samples for TPHg with EPA method 8015M and BTEX with EPA Method 8020 ♦ Test selected representative samples for soil physical and chemical characteristics which relate to movement of water and contaminants through the soil PHS/EHD reviewed the TVG workplan,made additional comments and suggestions, and approved the Work Plan on December 21, 1995 SECOR Inveshgation TVG contracted SECOR to perform the scope of work outlined in TVG's Work Plan, Soil and Groundwater Investigation Tri Valley Growers, 25200 Nowell Road, Thornton, California and approved by PHS/EHD The investigation was performed on April 18, 1996 and consisted of advancing three soil borings (SB-8 to SB-10) using hollow-stem auger techniques to depths of 20 to 33 feet bgs Hallow-stem-auger drilling was used rather than the approved direct push method due to an equipment failure Soil samples were collected with a California modified split-spoon sampler at approximately 5-foot minimum intervals Hydropunch groundwater samples were to be collected at two depths in each boring, the beginning of saturated soil, and at termination of the hole at 20 feet bgs Although Hydropunch sampling is commonly performed with hollow-stem-auger techniques, apparently a hydropunch sampling tool was not available Groundwater samples were collected through the auger with a bailer Soil and groundwater samples were submitted to Inchcape Testing Services Environmental Laboratories (now called ITS) in San Jose Seven soil and six groundwater samples were analyzed for TPHg with EPA method 8015M and BTEX with EPA Method 8020 Analytical results are summarized in the following Table Laboratory analytical reports have been requested from both SECOR and the laboratory but have not yet been made available to TVG SECOR Inveshgation at TVG Plant T, Thornton, Califorma, on April 18, 1996 Soil Sample Analytical Results Sample TPHg Benzene Toluene Ethylbenzene Total Number I I I I I Xylenes Soil Samples milligrams per kilogram m SB-8-16 0 <0 50 <0 005 <0 005 <0 005 <0 005 SB-9-11 5 <0 50 <0 005 <0 005 <0 005 <0 005 SB-9-15 5 2 2 <0 005 <0 005 <0 005 <0 005 SB-10-16 0 0 8 <0 0 <0 005 <0 005 SB-10-19 5 <0 50 0 005 0 012 <0 005 0 022 SB-10-26 0 4 6 0 068 0 062 0 051 0 14 SB-10-32 5 0 7 0 019 0 054 0 022 0 012 SB-9-11 5 - indicates sam le from 11 5 feet bgs in boring number 9