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r1 <br /> Mr Sam Savig <br /> Page b of 6 <br /> • 5.0 CONCLUSIONS <br /> Only very low levels of residual petroleum hydrocarbons remain in soil beneath the former USTs <br /> Low levels of gasoline constituents are present in groundwater in the vicinity of the former USTs <br /> Although a "zero line" of contamination was not determined, no drinking water MCLs were exceeded in <br /> any site well, which suggests that groundwater has not been significantly impacted beneath the site <br /> Based upon the general poor quality of the shallow groundwater beneath the site, the absence of any <br /> active drinking water wells within 1,000 feet of the site, and the land use downgradient of the subject site <br /> (pavement of Eleventh Street and commercial/retail use), the low levels of dissolved hydrocarbons beneath <br /> the site pose very little risk of impacting usable groundwater beneath the site <br /> 6.0 RECOMMENDATIONS <br /> Ground Zero recommends conducting an additional round of groundwater sampling at the site to confirm <br /> contaminant concentrations and groundwater flow and gradient beneath the site If constituents of <br /> concern are below drinking water standards in samples collected during confirmation sampling, Ground <br /> Zero expects to pursue closure of the site as a low-risk contamination site based on the following <br /> Very little residual contamination in soil, <br /> • . No constituents of concern in groundwater exceeding drinking water standards, <br /> No detectable MTBE or other oxygenated gasoline additives or lead scavengers in the groundwater, <br /> General poor water quality of shallow groundwater in the area, <br /> Low groundwater velocities and commercial use of downgradient area, <br /> No known active drinking water wells within 1,000 feet of the site, <br /> Very small likelihood of impacting usable drinking water <br /> Please feel free to contact the undersigned at (209) 838-9888 if you have any questions regarding this <br /> submittal <br /> Respectfully, <br /> Ground Zero Analysis, Inc <br /> �f r BRED G� <br /> S can Garvey, <br /> Staff Geologist <br /> � JQF'IV P <br /> LANE e <br /> No 6795 <br /> John P Lane, �� <br /> CA Registered Geologist No 6795 OF CAL\� <br /> Attachments <br /> G IDataIGROtJNDZEITHORPEISouza\Reports\WELLRPT doc <br />