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ENVIRONMENTAL HEALTH DEPARTMENT <br /> ' SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bergman,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> �.. P. Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> q ......... '� <br /> tiFoad Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> KAREN PETRYNA MAY 2 12003 <br /> SHELL OIL PRODUCTS US <br /> PO BOX 7869 <br /> BURBANK CA 91510-7869 <br /> RE: Shell-branded Station Site Code:506171 <br /> 2494 E. Fremont St. RO#: 0000251 <br /> Stockton, CA., 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Site <br /> Investigation/Groundwater Monitoring Report— First Quarter 2003" submitted by <br /> Cambria Environmental Technology Inc and has the following comments. <br /> This combination report covers monitoring well and CPT installations conducted <br /> during November 2002 and a groundwater monitoring and sampling event held <br /> on January 6, 2003. <br /> Included in the report were figures that contained soil and groundwater data from <br /> the new borings and wells at varying depths for TPHg, BTEX, and MtBE. These <br /> maps portrayed the subsurface conditions to be only slightly impacted and the <br /> discussion included in the report also indicated that only a slight impact was <br /> present. <br /> Unfortunately, other petroleum constituents of concern, 1,2-DCA and methanol, <br /> were not included in these maps and discussion of their presence was limited to <br /> stating only their detected laboratory analysis value. No recommendations or <br /> discussion for further investigation of these constituents was included. <br /> Methanol was detected in a groundwater sample from each of the newly <br /> installed, deep-screened monitoring wells. Groundwater samples from "S-1-85' <br /> contained Methanol at 5,600 µg/I, "S-3-84" contained Methanol at 4,300 Itg/I, and <br /> the groundwater sample from monitoring well "S-4-83" contained Methanol at <br /> 1,000 µg/l. 1,2-DCA was also detected above maximum contaminant levels <br /> (MCL) in groundwater samples from the three new, deep monitoring wells onsite, <br /> two of the offsite, down gradient CPT borings, and in three of the four onsite CPT <br /> borings. Additionally, groundwater samples from the existing monitoring wells <br /> ("S-1 thru 4") also indicated that 1,2-DCA is present above the MCL in all the <br /> shallow monitoring wells during this latest sampling event (January 2003). <br />