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{ i Y , <br /> ECEIVED OCT 249Z <br /> ENVIRONMENTAL HEALTH DEPARrYMENT <br /> AQ[]I N SAN JO.G- QUID., COUNTY <br /> O Q <br /> Unit Supervisors <br /> Donna K Heran RE H S <br /> D¢recror 304 East Weber Avenue, Tlurd Floor Carl Borgman,R E H S <br /> Al Olsen,Rike Huggins,R E H S ,R D IE H S Stockton, CaliforniaCalxfornla 95202-27D8 Douglas w Wilson,R E x s <br /> Laurie A Cotulla,R E N S <br /> F Program Manager Telephone (209) 468-3420 Margaret Lagono,RE H S <br /> Fax (209)464-0138 Robert McClellon,R E H S <br /> Program Manager Mark Barcellos,R E H S <br /> STEPHEN VALENTINE / , 0 OCT 2 2 Z002 <br /> STEVE & GENES SERVICE <br /> � <br /> 6232 HEMET AVE 'C <br /> STOCKTON CA 95207 <br /> RE STEVE & GENES SERVICES SITE CODE 2080 <br /> 2315 N EL DORADO ST <br /> STOCKTON CA 95204 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Additional <br /> Characten:�:ation Work Plan (work plan) dated June 27, 2002 prepared by Geological Technics,Inc <br /> (GT) The work plan proposed installing 19 monitoring wells to assess the vertical and lateral <br /> extent of the impacted groundwater GTI proposes to EI <br /> 1) Install a 2-inch diameter monitoring well,MW-301 at 155 feet below surface grade <br /> (bsg) using mud rotary system and a 6-inch diameter steel conductor casing to 130 <br /> feet bsg to minimize cross-contamination Total depth of MW-301 would be <br /> determined at the field,and the borehole would be logged from 130 to 170 feet bsg <br /> 2) Install six clustered shaIlow/ intermediate/ deep wells for a total of 18 monitoring <br /> wells using hollow stem auger and mud rotary system off site to define the lateral <br /> extent of the contamination Each well cluster made up of one shallow monitoring <br /> well screened at 25 to 40 feet bsg, an intermediate well screened at 70 to 80 feet bsg, <br /> and a deep monitoring well screened at 120 to 125 feet bsg <br /> EHD has received 1frQuar1er2002 GroundwalerMonaonng Report dated May 15, 2002 prepared by <br /> GTI,and fax of the analytical results for the June sampling event received on September 9, 2002 <br /> from GTI Analytical results of the last three groundwater samples collected from the deepest <br /> monitoring well (M%V-201) on site are as follows <br /> Table 1 A-n lytical results of groundwater samples from MW-201 <br /> Benzene Toluene Ethyl- Xylenes TPH-gas MTBE <br /> Benzene <br /> 12/11/01 138 855 247 165 1,140 ND<5 <br /> 02/27/02 10 15 08 16 233 ND<5 <br /> 06/14/02 ND<0 04 ND<0 09 03 48 ND<8 24 <br /> All results in micrograms per liter (gg/1) TPH-gas Total Petroleum Hydrocarbons as gasoline <br /> MTBE Methyl tert butyl ether ND Non Detect <br /> Concentrations of petroleum hydrocarbon contamination in the groundwater samples of MW-201 <br /> have dropped significantly since its installation in October 2001 Additional monitoring wells <br /> I. screened in the same depth of MW-201 do not appear to be necessary at this time Installation of <br /> the proposed]AW-301 is not approved at this time, but may be necessary in the future depending <br /> on future monitoring results <br />