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Page 2 of 3 What would happen if you waited another 19 days for the metallic byproducts to continue to decrease. What further decrease could he expected? I would expect the concentration to drop below detection levels. Do I understand correctly that the non-metallic contaminants are now at 5%? Non-metallic (hydrocarbon) concentrations within the soil and ground water sent to the laboratory are, at the most, 5% of the original concentration The contamination is still beneath the site, but we assume that oxidation would have a similar effect on.the soils and ground water beneath the site as it did in the laboratory. What is the state/county app oved concentration maximum?Recently, with the budget/recession issues, the regulatory agencies are less stringent on the maximum contaminants they are allowing at sites for closure. If we put a significant decrease in the existing concentrations beneath the site and produce a decreasing trend in concentrations, the regulatory agencies will likely close the site. We should get the gasoline concentrations in ground water in the low 4 digits (]000s). You state that permitting and work plans are usually involved. What the other possibilities? For oxidation, we will have to in tall injection points/wells to inject the media and possibly monitor the metals. Other remedial optio s due exist, but would also require the preparation of work plans and some permits. Oxidation has the potential to greatly decrease the contaminant mass (e.g., 95% documented in the laboratory) in a quick tin ie frame. The injections would likely have to take place several times to knock the concentrations do (rather than one application). An important aspect of oxidation will be ground water monitoring (sampling the wells) to document how the contaminant concentrations are responding to the chemical processes. I hope I answered your questions...if not,please let me know. Take care, Ally From:judie kindle[mailto:tombal lodi@gmajl com] Sent:Wednesday,September 01, 010 4:42 PM To: acolavitaCi)ad�eoenv.com Cc:rarjak;Vicki McCartney[EH] Subject:Re: Lopez Property site pdate 09/01/10 Thanks for the update on the!Lopez property. Couple questions. What would happen if you arted another 19 days for the metallic byproducts to continue to decrease. What further decrease could c expected? What is the source of these byproducts? Do I understand correctly that the non-metalib contaminants are now at 5%? What is the state/county approved concentration maximum? Y u state that permitting and work plans are usually involved. What the other possibilities? Again, thanks. On Wed, Sep 1, 2010 at 1:4 PM, Alison Colavita<acolavitaCa).advgeoenv.com>wrote: Hi Judie and Janie: Re: Lopez Property, 1601 Turnpike Road, Stockton Site Update: 09/01/10 9/2/2010