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Problem Assessment Report Page 3 Ranch Market,23569 South Santa Fe Road,Riverbank,CA November 8,2000 ' • On April 28, 2000, the RWQCB conditionally approves SECOR's April 25, 2000 Revised Work Plan For Soil and Groundwater Assessment Final approval was granted on June 1, 2000 via an email from the RWQCB 0 On May 18, 2000, SECOR oversaw the down-hole video logging of domestic wells ' DW-1 and DW-2 SECOR submitted the May 23, 2000, Domestic Well Video Survey Report to the RWQCB The video log revealed the domestic well DW-2 that contained reportable concentrations of MtBE, was approximately 59 feet deep and had ' a hole in the casing at 32 and 40 feet bgs Well DW-1 was 70 feet deep and appeared to be screened from 60 to 70 feet bgs ' • On July 17-18, 2000, SECOR oversaw the advancement of GeoprobeTM borings GP-1 through GP-4 north, east, and south of the former UST location ' • On July 24, 2000, SECOR advanced two continuous core soil borings, SB-1 and SB-2, to 70 feet bgs to define the lithology and vertical impacts to soil ' • On August 8-11, 2000, SECOR oversaw the installation of MW-5D and MW-5 through MW-9 to define the vertical and lateral extent of soil and groundwater ' impacted with gasoline released from the former UST at the Site • A report was submitted by SECOR entitled Evaluation of Potable Water Sources, ' dated August 18, 2000 to the San Joaquin County Public Health Services, Environmental Health Division (SJCEHD) and the RWQCB ' • September 6, 2000 SECOR attends meeting with RWQCB, SJCEHD, SWRCB UST Cleanup Fund to review the assessment results and plans for the supply of potable water to the Pantoja Property • A work plan was submitted by SECOR entitled Work Plan For Well Installation and Feasibility Testing, dated September 13, 2000 to the RWQCB • A report was submitted b SECOR entitled Additional Evaluation o Potable Water P Y .f Sources, dated September 14, 2000 to the San Joaquin County Public Health Services, Environmental Health Division (SJCEHD) and the RWQCB • On September 21 and 22, 2000, SECOR oversaw the installation of air sparge well IAS-1 and six soil vapor extraction wells, V-1 through V-6 through and adjacent to the former tank pit at the Site A summary of the well installation and results of the soil vapor extraction/air sparge feasibility test (SVE/AS) conducted on October 2 and 3, 2000 are presented in a later section of the report Details related to the distribution of gasoline in the soil and groundwater at the Site are discussed in later sections of this report I File PAR-report doc SECOR International Incorporated