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i{ <br /> 130 North Hunter Street - TP" ;p Caisson Stockpile Page 1 of 1 <br /> N ' <br /> Vicki McCartney [EH] <br /> From : Dustyne Sutherland [djsutherland@treadwellrollo.com] <br /> Sent: Friday, May 13, 2005 5:25 PM <br /> To: Vicki McCartney [EH] <br /> Cc: David Dixon <br /> Subject: 130 North Hunter Street - TPH in Caisson Stockpile <br /> Vicki, <br /> Per our conversation on 12 May 2005, we are requesting concurrence from your office to re-use stockpiled soil <br /> onsite that has detectable concentrations of total petroleum hydrocarbons as gasoline (TPHg) and kerosene <br /> (TPHk). The 170 cubic yard soil stockpile was generated from drill cuttings during installation of caissons for the <br /> new building at the site. The City of Stockton wishes to reuse this soil on site to build the base of a ramp inside <br /> the parking garage. The soil would be placed above the ground surface and covered with concrete on the top <br /> and sides. <br /> Stockpile samples SPA-1 and SPA-4 were collected on 19 April 2005 in your presence. Each sample represents <br /> approximately 85 cubic yards of soil . The laboratory data sheets for these samples are attached , and are <br /> summarized on Table 1 . No BTEX compounds were detected in either sample. SPA-1 contained TPHg and <br /> TPHk at 57 and 4. 7 milligrams per kilogram (mg/kg ) respectively. SPA-1 contained TPHg and TPHk at 1 .9 and <br /> 5 .4 mg/kg respectively. Af UM $ 4 -05 <br /> At your request we have calculated the mass of the hydrocarbons in the stockpiles. Table 2 summarizes our <br /> calculations. The soil represented by samples SPA-1 and SPA-4 contain approximately 15. 73 and 1 . 86 pounds <br /> (lbs) of TPH respectively. We believe leaving this soil on site will not affect the ability to remediate or close this <br /> site because: <br /> o The TPH concentrations in the stockpile are low compared to those found in the subsurface; <br /> o The TPH concentrations in the stockpile are likely lower than can be achieved in the subsurface <br /> after remediation; <br /> o Using a rough calculation of the mass of TPHg in the site subsurface of 6,000 to 10,000 lbs, the total <br /> TPH mass in the stockpile represents a fraction of one percent of the TPHg at the site, and <br /> o The stockpile soil will be encapsulated and will not be a threat to other site soil or groundwater. <br /> Please contact David Dixon or myself with any questions. <br /> Regards, <br /> Dustyne Sutherland <br /> «TPH in Stockpiles . xis» <br /> <<% TPHgas in stockpiles.xls>> <br /> <<stlsf2005040622-finalreport-frp0000464638. pdf>> <br /> 5/16/2005 <br />