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' OCT 23 '99 14:44 E I O NA''�t'IAL CORP. P.2/4 <br /> BIO NATIONAL CORPORATION <br /> Environmentol Restoration through Microbial Application <br /> October 23, 1989 <br /> Mrs. Diane Hinson, REH$ OCT 2 41989 <br /> Environmental Health Division <br /> San Joaquin County Health Services ENVIRONMENTAL HEALTH <br /> 1601 East Hazelton Ave. PERMIT cFR\/ICES <br /> Stockton, CA 95205 <br /> REQ': Holt Bros, 1521 W. Charter Way, Stockton <br /> Dear Duane: <br /> Attached are the analytical results for water samples obtained from MW-1 and <br /> MW-6, and a location neap. Water levels indicate that the groundwater gradient <br /> in the area is directly south, in a direction from MW-1, toward MW-6. <br /> As evidenced by the results, no detections of hydrocarbons were noted in the <br /> MW-6 water sample. On site evaluation of MW-5 also indicates no detections of <br /> hydrocarbons in that well. This data seems to suggest that the plume of <br /> contamination in the groundwater identified around MW-1 has not extended <br /> latently at this point. <br /> We, and our subcontractor for the study, Dames & Moore, recommend the <br /> County of San Joaquin approve the beginning of extraction of ground'w'ater <br /> and free product from MW-1 as soon as possible. This would decrease the <br /> Probability of any additional latent migration downgradient from MW-1 while <br /> the D&.M Phase TI Investigation Report is finalized. <br /> This Phase II report covers both the soil and groundwater contamination, and <br /> be the basis of the long term treatment prograrn for soil and groundwater. <br /> requesting permission to collect the extracted groundwater on site, <br /> ag same to a combination of biological and ozone/uv/carbort treatment <br /> -ed Oxidation Unit) before disposing in the local sewer system. <br /> .he groundwater and floating product will be extracted separately from MW-1, <br /> by a combined extraction, system provided by Diversified Well Products, Inc. <br /> gave the capability to collect floating product and groundwater separately, <br /> will direct both flows into a single 6,0('" gallon biotreatment tank at the <br /> . of 2 5 gpm. This tank will be vented .)ugh a carbon air filter. <br /> elITIAT1ON OF GPOUNDWATER EXTRACTIOA xND TREATMENT - Biological <br /> treatment is to biodegrade the floating gasoline and solvent components, <br /> plus any that are in evidence in the extracted water. Laboratory <br /> samples indicated indigenous organisms began functioning in the water <br /> when the floating layer was penetrated and aeration occurred. <br /> 4609 Now Horizon Blvd., Suite 7 • Bakersfieyu �-A 93313 • (805) 833-1145 « FAX (805) 833-35,3.• <br /> 1 HOLT902 <br />