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Lfj7, 'TC =r� 3PUBLIC EALTPISERV ICES =f- , f Uj#jf <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION :i <br /> Karen Furst, M.D„ M..P.FL, Health Officer <br /> L 'LiAaae' <br /> - 304 East Weber Avenue, Third Floor Stockton, CA 95202 <br /> 209/468-3420 _ <br /> L <br /> OCT, o,3 <br /> 2�0 <br /> ffiTam RISE INVESTM= <br /> C/O MONTY AIM LAURA WARREN <br /> 2165 N COWLES ST <br /> LONG BRACE CA 90 813 s <br /> Re: 7 &B Mutphy Trucking Site Code: 711 <br /> L 355 Enterprise Place <br /> Tracy CA 95376 <br /> L San Joaquin County Public Health Services,Environmental Health Division(PHS/EM) <br /> has reviewed the Preliminary Investigation and Evaluation Report dated September 21, <br /> w 2000,prepared by Advanced GeoEnvironmental for the above referenced site. -Soil and <br /> f groundwater samples collected at this site evidence petroleum co on. Further <br /> L evaluation of soil and groundwater contamination at this site is necessary. <br /> L Methyl-ter[-butyl ether(MTBE)was evidenced in groundwater at 7.6 parts per.billion <br /> (ppb). The secondary maximum contaminant level for MTBE in drinking water is <br /> currently 5 ppb. Concentrations of total.petroleum hydrocarbon as gasoline(TPHg) and <br /> L total petroleum hydrocarbon as diesel(TPHd)were evidenced in groundwater as high as <br /> 3,100 ppb and 2,900,000 ppb respectively. The highest concentrations ofbenzene,- <br /> toluene; ethylbenzene,and xylene(BTEX)evidenced in groundwater were 3.7-ppb, 2.7 <br /> Lppb, 5.5 ppb, and 2.5 ppb,respectively. Concentrations of BTEX,TPHS, TPHd, and <br /> oxygenates in the groundwater'must be confirmed by utilizing repeatable sampling points <br /> .L to obtain representative groundwater samples. <br /> TPHd was evidenced in soil at 1.$ arts million 25 feet below surface <br /> P Pe?' (P!?m). lie <br /> (bsg) in P 1. TPHd was also evidenced in soil at 2.4 ppm 20 deet bsg in P4. A soil sample <br /> collected from P4 at 10-feet bsg evidenced TPHd at 3,400 ppm.The vertical and lateral <br /> extent of soil contamination must be determined at the site. If further investigation <br /> reveals significant TPHd contamination in soil at this site,PHS/E*M recommends that <br /> removal of the affected soil at this site be proposed in a work plan. <br /> A minimum of three monitoring wells must be constructed to evaluate the groundwater <br /> Lconditions and to establish the groundwater gradient. Monitoring wells should be <br /> screened at an interval that is representative of the affected groundwater.At least one <br /> Lmonitoring well should be located in the am ofboring?4. <br /> Quarterly monitoring must be initiated after the monitoring wells have been installed and <br /> Lcontinue until otherwise directed by PHS/EHD. Groundwater samples should be <br /> LA Division of San Joaquin County Health Care Services <br />