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1r"ofth : LLC <br /> ENVIRONMENTAL AND HYDROGEOLOGICAL CONSULTING <br /> 643 Oregon Street, Sonoma, CA 95476 <br />' Phone: (747) 284-3826 <br />' .duly 26, 2001 <br />' Marty Hartzell, RG, AEG Jeff Wong, REHS F , <br /> CVRWQCB San Joaquin CountyGi� <br /> 3443 Routier Road Environmental Health F, <br /> Sacramento, CA 958273098 304 East Weber Avenue, 3' <br />' (916) 255-3115 Phone Stockton, CA 95202 l�y <br /> (916) 2553439 FAX (209) 468-3420 Phone <br />' SUBJECT. GROUNDWATER MOMTORING EVENT FOR THE FORMER UNDERGROUND <br /> STORAGE TANKS (USTS)AT THE FORMER Tom, AND COUNTRY <br /> CHEVRON SITE LOCATED @ �3336 HmM a8, Lackeford, CaRik G nk <br />' Dear Mr. Hartzell and Mr Wong. <br /> g <br /> Enclosed are the details of groundwater monitoring of three (3) groundwater <br /> monitoring wells Groundwater sampling and analyses of hydrocarbons <br />' confirmed that no gasoline constituents, except for 1.0 ppb of 1,2 DCA in MWA, <br /> was identified in the perched groundwater zone. The last groundwater monitoring <br /> event identified 5.0 ppb toluene in MW-2. In each case, the concentrations <br /> identified are extremely low, are well below their respective MCLs, and are in no <br />' way representative of any concentration gradient trends indicative of a residual <br /> secondary source in proximity to the perched aquifer zone. <br />' It is recommended that the site be closed based upon the fact that a significant <br /> hydrostratigraphic barrier exists between the contamination identified in <br /> intermediate depth soils and the absence of significant contamination in the <br />' deeper perched groundwater zone. <br /> If you have any questions, please <br /> GE <br /> Sincerely, O`Q�� ��� �o�OQ�� <br />' CER'nFlED <br /> WDi�OGE0lOWST <br /> Franklin J. G man s� N0 466 <br />' CEO/Geos , LLC q�°F Cpt`�OQ <br /> Registered eologist No 5557 <br /> Certified Hydrogeologist No. 466 <br />' 07-26-2001 GeoSohro LLC- Groundvvow Monitoring for Nunan Page I of 3 <br />