SITE INFORMATION AND CORRESPONDENCE FILE 2

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CLEARWATER C. G R o u P, I N C. - 8nvironmentnf Services 4 k Mr. John Tittelfitz, of Solleco, manufactured,.delivered, and helped configure the system on-site, including dilution air points. 'Considering his experience with these units and the fact his company owns the unit at the referenced site, I am confident in his ability to ensure his machines are configured such to run smoothly and efficiently. 2 There was no temperature gauge on the V I flow sensor. Since gas volume is a function of { ) p g g temperature, a temperature gauge is necessary to be able to report a value in standard cubic i feet/meter [sic] (scfm)." i Clearwater concurs.that knowledge of temperature is important in the accurate determination of gas volume. For clarification, the display of airflow at V1 assumes that temperature is 80°F (°a r. relatively safe assumption following minimal heating by the blower) and humidity of 40% (a low end assumption). These values are automatically factored into the calculated flow displayed at V1. Clearwater.will endeavor-to install ports to measures these parameters, but it is my belief, based on j experience,that these assumptions are sufficient to determine-airflow rates. i " Eadh-wellhead-,must have: --apressure gauge;to rnoriitor-vacuum;,a-flow-meter,'to quantify ' . -air volumes; a sampling.port,-to-allow for specific wellhead contaminant level testing; a temperature gauge,-to be-able to standardize=airflow rates. A control vale should be installed at each wellhead. Radius of influence testing.must be performed on each well in order to determine what role each +' well is playing in the remediation.effort. To do a proper radius of influence analysis you must i isolate (turn offiall.other wells, apply vacuum and flow to the well you are testing and then measure the induced vacuum of the other wells If Clearwater Group, Inc. chooses to use temporary gauging to perform this rnonitoring; they.need to have a.set of gauges for-each wet and be able.to insure that the temporary, system are airtight(not allowing any flow or vacuum leaks Into or out of the system)." It should be-noted that most of the.measurement ports and flow control devices requested here are � p , i routinely located at the above-ground remedial piping manifold instead of at each wellhead for ease of access. 'The system was constructed with control valves for each well at the manifold. Clearwater will endeavor to install-appropriate ports adjacent to each well control valve to facilitate the measurements requested above. Please note that soil vapor extraction pilot testing was performed o four of the seven wells currently used for vapor extraction'in December 1995. The i 3 'Ms. Lori Duncan, SJCPHSIEHD 2 December 23, 1998