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' Mohr Fry Ranches 9SO Industrial Drive, Stockton, California May 30, 1996 Bioremediation Report Page; 2 1 WHF, Inc , conducted six (6) soil borings at the location of the former UST's Two of the ' borings were developed into monitoring wells The third boring, developed into a monitoring well, was located south of the two former tank excavations The remaining borings were located around the former tank excavations to aid in the lateral definition of ' the soil contamination On February 16, 1995, WHF, Inc, completed a "Technical Data Review Report- Waste ' Acetone Tank Site" report regarding the removal of two (2) 8,000 gallon acetone tanks The excavation samples detected contamination being present at approximately 15 feet in depth A work plan was directed, under San Joaquin County PHS/EHD, and was to be ' completed by April 15, 1995, to identify the lateral and vertical extent of contamination All proposed work regarding the acetone tanks were conducted under a different ' consultant On March 29, 1995, WHF, Inc , in conjunction with SEMCO, began the first of three (3) ' remedial excavations at the Mohr-Fry site WHF, Inc , screened soil samples with a portable PID (photo ionization detector) and logged the hthology of the exposed walls using the Unified Soil Classification System All excavations were closed by April 6, 1995 All soil samples from the first excavation, located near the three (3) former 6,000 gallon surface tanks, were non-detect for BTX&E, Motor Oil, and Diesel Approximately 150 cubic yards of soil were removed from the area The second excavation yielded approximately 361 cubic yards Motor Oil and Diesel contamination was identified in the walls of this excavation The third excavation, directly adjacent to the main building, consisted of approximately 200 cubic yards 3.0 .f o Scope Work Upon approval of the soil treatment work plan dated June 26, 1995, FIM Inc , as directed by WHF, Inc., spread the stockpiled soil to an average height of 12 inches while ' inoculating it with a petroleumplulic bacteria culture and nutrients A six (6) mil plastic liner was used to separate the contaminated soil from the ground surface Maintenance and cultivation of the soil and bacteria was performed once a week for the first six weeks and then periodically to maintain balance throughout the treatment period The soil was then re-inoculated in December of 1995 to further aid in decreasing the levels of contamination ISan Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) did not require a permit for the above activities This was because of the lack of vapor exhumation or emissions from the compounds and concentrations of diesel present in the soil