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WEGE <br /> ES 1386 EAST BE <br /> AMER STREET ' <br /> GEO ENGINEERS, wooDLAND, CA 95776-6003 <br /> CALIF CONTRACTOR #513857 A CORDO T FAX (916) 662-0273 <br /> REGISTERED GEOLOGISTS IATI03 � 4�!f1 (916) 668_530 <br /> - �.:�;:.;4Y <br /> Ms- Mary ;'Meays <br /> San Joaquin County Health <br /> 304 East Weber February <br /> Stockton, CA 9520 8, 1996 <br /> (209) 468-03372 <br /> FAX (209) 464-0138 <br /> S <br /> RE: Request to • (1) <br /> Place ORC socks into MW12 to enhanced <br /> bioremediation; <br /> System and; (2) to schedule Removal of the Thermal Oxidation <br /> Regal Statand <br /> (3) o start up of Carbon Adsorbtion System at Former <br /> 6425 Pacific Avenue, Stockton, California. <br /> Dear Ms . Meays : <br /> This letter is a follow-up to our intent to change the BACT at <br /> the above mentioned site . At this time WEGE is also requesting <br /> the approval to insert Regenesis ORC oxygen release compound in <br /> MW12 for enhanced bioremediation. <br /> r <br /> WEGE has scheduled the removal of the Thermal Oxidation system <br /> and the start-up of the Carbon Adsorbtion System for March • 1, <br /> 1996 . At this time WEGE is intending to perform the quarterly <br /> ground water sampling of the site and insert the Regenesis Oxygen <br /> Release Compound, ORC into MW12 to enhance bioremediation.. <br /> As you are aware we are presently performing a once a week two <br /> hour bio-venting of MWS , which is east of Pacific Avenue across <br /> the street from the site and our vapor extraction system. The <br /> venting of-i MW8 does seem to be stabalizing the ground water <br /> plume, as evidenced by the reduction in benzene concentrations at <br /> MW8 , but has had no noticeable effect on MW12 , see Figure 5 . <br /> l'ur <br /> MW12 is downgradient and southeast of MW8 and shows no effects of <br /> the bio-venting, see Table 1 - Chemical Results . WEGE is <br /> proposing to perform a six month comparison of the MW8 weekly <br /> bio-venting' by LTT and the Regenesis ORC socks inserted into <br /> MW12 . <br /> PROCEDURES <br /> MW8 <br /> Presently !Lawerence Tank Testing (LTT) is bio-venting MW8 on a <br /> weekly basis as outlined in the following: <br /> i <br /> 1 . The vacuum influence measurement is accomplished by/ <br /> removing the locking cap from the casing and installing <br /> a 4 inch PVC cap with a sample port onto the casing' <br /> s <br /> PAGE1 R60?-ORC MW12 2-8196 <br /> i <br />