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SOIL REMEDIATION REPORT 6540 E JAHANT ROAD ACAMPO, CALIFORNIA 95220 1 0 INTRODUCTION AND BACKGROUND ' This soil remediation report has been prepared to provide a detailed discussion of the remedial activities conducted at the site located at 6540 E Jahant Road in Acampo, California ' The site resides in a rural area northeast of the city of Acampo The property is used for agricultural and residential purposes The location of the site is shown on Figure 1 In 1946, a 300 gallon underground fuel storage tank was installed on the property The tank was used for the fueling of both farming equipment and personnel vehicles Use of the tank continued through 1986 when it was removed from service During the operating period for the tank, both ' leaded and unleaded gasoline were stored in it On July 17, 1991, the underground storage tank was removed The tank was visually observed to ' be in poor condition and petroleum hydrocarbon odors were detected within the excavation overburden Sal sampling of the tank excavation bottom soil was conducted The analysis of the soils samples indicated a significant presence of petroleum hydrocarbon compounds Subsequent over-excavation of the tank area to remove impacted soils was conducted These soils were stockpiled onsite and amounted to approximately 600 cubic yards (cu yds) Soil samples were collected from the stockpiled soils The analytical results for the soil stockpile samples are enclosed as Appendix A These results indicated that the stockpiled soils contained Total Petroleum Hydrocarbon compounds as Gasoline (TPH-G) in concentrations up to 907 milligrams per kilogram (mg/kg) Varying levels of Benzene, Toluene,Xylene and Ethyl-benzene (BTX&E) were also detected in these soils No EDB was detected in these soils In order to remediate the stockpiled soils, ' TreaTek Inc (TreaTek) initiated a biological remediation program The following sections provide a detailed discussion of the biological remediation program ' conducted at the site 20 BIOLOGICAL REMEDIAL PROGRAM ' On November 14, 1991, TreaTek prepared and submitted a soil remediation work plan for the subject site This work plan contained detailed discussions of the planned site activities In conjunction with the submittal of this work plan, the 600 cuyds of soil were placed onto a treatment ' bed The treatment bed, located as shown on Figure 2, was first lined with 6 mil plastic sheeting on top ' of the native soil Once the plastic was placed, the stockpiled soil was distributed onto the plastic with a maximum thickness of two feet Fallowing placement of the soil, the bed was covered with 6 mil black plastic sheeting (Figure 3) to preclude volatile compound emissions, moisture loss and ' to maintain a constant bed temperature The bed remained in this condition until December 16, 1991 at which time the soil additive nutrients ' consisting of Ammonium Monophosphate, Ammonium Sulphate, Urea, Yeast Extract and Potassium Chloride were surface applied Once applied, these nutrients were blended into the soils via tilling 1