ARCHIVED REPORTS XR0012749 - Laserfiche WebLink

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- s .ter'. �'"-�• . -7- 3. The high levels of hydrocarbons found in the groundwater beneath the site are not warranted by the hydrocarbon levels found in the soil. beneath the site. As yet, no direct path for migration of hydrocarbons nor areas of high hydrocarbon concentration in the soil have been detected. eased on available data, an off-site source possibly rc ;-he north may be a contributing factor. 4. To prove of disprove an off-site source to the north, Geweke Properties sh6uld determine if shallow wells to the north are available to sample. If the house imms6iately to the north has a well, this well should be sampled. Other wells in the vicinity of the Geweke Lodi site could also be sampled. Well logs, completion data, ' and the owner's permission should be obtained before sampling. The use of existing wells would be less costly than drilling new monitoring wells. If no suitable or existing wells are available, we recom:uend - one additional monitoring well he drilled in the northwest corner of the property and sampled. 5. The Geweke Lodi site may be a contributing factor to the levels of hydrocarbons in groundwater beneath the site. If Geweke Properties retains possession of the property, some sort of groundwater cleanup action may be mandated, and further investigation will be required. It is cur conclusion that the high hydrocarbon levels in groundwater found beneath the site may be due to other sources. Currently, there is not enough data from this investigation to define the source of the DTX/TPH problem. These sources must be investigated prior to any cleanup action. Be •ause there are indicatio.es that the groundwater contamination may be a regional problem, -- we recommend Geweke Properties meet with the City of Lodi and appropriate regulatory agencies to disc;iss the impact of this contamination on their site.