Case Study #7 – Tempe, AZ Scope of Work CalClean was contracted to conduct a 60-day HVDPE event for a confidential client located in Tempe, AZ. The subject site exhibited elevated concentrations of petroleum hydrocarbons with over 1 foot of free product in the soil and groundwater beneath the site. A high vacuum was applied for vapor extraction and drawdown of the groundwater table, while vacuum and vapor flow rates were modified to optimize recovery of vapor, free-product and dissolved-phase hydrocarbons. Lithology Native soil types encountered during site characterization activities generally consisted of sandy silt to approximately 25 to 30 feet below ground surface (bgs), silty sand from 25 to 30 feet bgs to 30 to 40 feet bgs and well graded sand with silt and gravel

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