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Voice 209 468-0337 Fax 209-468-3433 San Joaquin County <br /> Environmental Health <br /> Fax <br /> To: Bob Boust From: Mary Meays, Senior REHS <br /> Fax: (510) 277-2309 Pages: 2 <br /> Phone: (510) 277-2334 Date: July 31, 1997 <br /> Re: 437 Miner CC: Steve Carter(916) 631-1317 <br /> ❑ Urgent ❑ For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle <br /> • Comments: <br /> I received on July 25, 1997 the City of Stockton Revocable Permit #97-11 and Encroachment <br /> Permit #64353. 1 issued today a conditional drilling permit #13207 that allows a maximum <br /> of 20 feet of screened interval. <br /> As I indicated in correspondence dated January 25, 1996, additional vapor extraction wells <br /> would likely be necessary, if vapor extraction is the remedial alternative for source removal. <br /> Also, I indicated in correspondence dated July 11, 1996, that additional vapor extraction wells <br /> may be necessary to evaluate the potential effectiveness of vapor extraction and to obtain <br /> system design information. My comments were related to the 1996 groundwater level which <br /> was 37 feet below ground surface and the screened interval of the nearby wells (30 - 55 <br /> feet). I reiterate these comments because the groundwater level was measured on May 1, <br /> 1997 at approximately 32 feet below ground surface. In order to more accurately measure <br /> vacuum influence, vapor extraction wells must be screened in the vadose zone. Also, in <br /> order to effectively vapor extract contamination, vapor extraction wells must be screened <br /> through specific zones of contamination. <br /> Please consider installing the additional vapor extraction well(s) necessary to perform an <br /> adequate vapor extraction test. It is generally most cost effective to install additional wells <br /> during the same mobilization. <br /> If you have any questions, please provide them in writing. Thank you <br />