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- EMVIROMMEMTAL MAMAGEMENT, IMC. <br /> 4 <br /> CD <br /> T <br /> 'N <br /> CIO �. <br /> May 30, 2003 c <br /> Ms. Adrienne Ellsaesser/Margaret Lagorio — = <br /> San Joaquin County Environmental Health Department -" <br /> 'r- <br /> 304 East Weber Avenue,Third Floor ` <br /> Stockton, CA 95202 <br /> Re: Operations Plan for Carbon System at Frontier Motel <br /> Dear Ms. Ellsaesser/Ms. Lagorio: <br /> Blaes Environmental, on behalf of U-Haul International, Inc., is submitting this operations plan <br /> for wellhead groundwater treatment using aqueous-phase carbon at the Frontier Motel in <br /> Stockton, California. The following operations plan for the carbon treatment system includes a <br /> brief description of the system 'design, sampling frequency and methods, and carbon vessel <br /> change-out procedures. <br /> 1.0 SECURITY: <br /> The entire carbon system will be secured,within a six-foot high padlocked chain-link,fence to <br /> prevent any unauthorized entry or vandalism.. .. <br /> 2.0 CALCULATED DAYS UNTIL INITIAL BREAKTHROUGH: <br /> The carbon system was designed for a peak demand of 20 gallons per minute (gpm). A 20 gpm <br /> flow limiting valve has been installed to ensure the system does not exceed this demand. The <br /> empty bed contact time for the carbon system was calculated to be 6.8 minutes at 20 gpm. In <br /> addition, the system design and sampling frequency was based on a maximum daily usage of <br /> 2,600 gallons per day (gpd), as determined by the motel's bulk water usage over the last six <br /> weeks. Due to limitations of their modeling program, Carbonair's liquid-phase carbon <br /> adsorption model calculations were based on the peak 20 gpm usage (continuous). This resulted <br /> in a calculated usage of 28,800 gpd when in .fact the maximum-observed usage has been 2,600 <br /> gpd. Therefore, the estimated breakthrough time is calculated by dividing the continuous total <br /> by 2,600. Based on these calculations, it is estimated that an influent concentration of 1.3 parts <br /> per billion (ppb) of 1;2 DCA will be detected after the primary carbon vessel after approximately <br /> 366 to 399 days of operation. <br /> 3.0 SAMPLING SCHEDULE AND ANALYSIS: <br /> The carbon system will be sampled prior to system start-up, twice .a month thereafter, and after <br /> every carbon change-out event. .Sampling events.will consist of sampling after the primary <br /> carbon vessel (sample valve #2) and after the secondary carbon vessel (sample valve #3). In <br /> addition,.at start-up and quarterly thereafter, the influent groundwater stream will be sampled <br /> (sample valve#1)..,The samples.will be collected and analyzed by FGL Environmental, Inc. <br /> 1433 North Third Avenue,Phoenix,Arizona 85003 <br /> Telephone:(602)728-0707 Fax: (602)728-0708 <br />