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Kennedy/Jenks Consultants existing excavation were not collected Analytical results from the excavation sidewail samples indicate Total Volatile Hydrocarbons (TVH)' at concentrations below the San Joaquin County Environmental Health Division's established detection limit of 10 mg/kg, although trace levels of toluene and xylene were detected The San Joaquin Unified Air Pollution Control District (SJUAPCD) guidelines (Rule 463 5) specify that sods with up to 50 mg/kg of "organic content" (i a TPH or TVH) may be aerated on site in unlimited quantities and are exempt from their limited aeration guidelines Most of the soils on the site fall into this category As shown in Table 1, only Sal Boring 22 (SB22) and Test Bore 5 (TB5) produced samples with concentrations that exceed this limit, therefore, will not be treated onsite ' TVH and TPH are equivalent TPH can also be an abbreviation for Total Purgeable Hydrocarbons In addition to the soil, there are 19 drums filled with water from well development and monitoring well sampling These waters will be discharged into the City of Stockton's sanitary sewer system Sediments in the bottom of these drums will be aerated onsite with the other soils All work will be performed with the approval of the City of Stockton A more detailed description of the water disposal is found under "Water Disposal Plan" Remediation Plan The sols from the stockpile and from all drums except for those marked T135 and SB22 will be spread out on the site's paved areas to a maximum depth of two feet, in a 30-foot by 50-foot area within the fenced site area as shown on Figure 2. These soils have an estimated total volume of 98 cubic yards Remediation of soils from drums marked T135 and SB22 will be addressed in a subsequent workplan To control surface water runoff, the remediation area will be isolated from the existing storm drainage system Runoff barriers may include dikes, hay bales, or plastic liners Soils will be sprayed with water prior to and during earthmoving activities to control dust The soils will be tilled or disced after five days of aeration and allowed to aerate for another five days prior to composite sampling Soils will be sprayed with water during tilling, as necessary, to control dust Although a permit for uncontrolled aeration is not required for TVH concentrations less than 50 ppm, SJUAPCD will be informed of on-site aeration activities. All work will be performed by an appropriately licensed contractor Soil Sampling Plan Following the ten days of aeration, the treated soils will be divided into 12 feet wide by 12 feet long by 2 feet deep sections One sample will be collected from the center of each section at a depth of 8 to 12 inches deep Four samples, one from each of four sections, will be combined for one composite sample Therefore, each sample will represent at most 43 yards of soil As specified in the SJUAPCD guidelines, each sample to be composited will be collected from at least three inches below the surface with either a driven-tube type . sampler or a clean brass or stainless tube driven into the soil Each sample will be sealed with inert materials, put on ice and transported to the laboratory for compositing to 91mpVRoekwplworkplsn 2 910557 00