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PUBIC HEALTH SE�WICES <br /> SAN 1oAQutNCOUNTY <br /> IOGI KHANNA M.D.NIT H. <br /> Heairh Officer <br /> P.O. Box 2009 • (1601 East Hazelton Av nue) • Stockton, California 95201 C+li F�ge�•P <br /> (209) 468-3400 <br /> RICHARD CALLISTRO <br /> SAN JOAQUIN COUNTY CAPITAL PROJECTS <br /> 222 EAST WEBER AVE ROOM 678 ; <br /> STOCKTON CA 95202 AUG,JC 1993 <br /> RE: San Joaquin County Human Services SITE CODE: 1257 <br /> 245 South Sutter Street <br /> Stockton, CA 95202 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) has <br /> completed review of the "Quarterly Groundwater Monitoring Report, San Joaquin County <br /> Human Services Agency, Second Quarter 1993" dated July 20, 1993 and prepared by <br /> Weston. PHS/EHD has the following comments for your consideration. <br /> I A number of problems with the report were encountered during review. <br /> 1. The reported detection limits (1 ppb) for benzene (B) toluene (T) <br /> ethylbenzene (E) and xylene (X) analysis were higher than the minimum <br /> detection limits (.5 ppb BTEX) as recommended in the Tri-Regional Board <br /> Staff Recommendations dated 10 August 1990. PHS/EHD was informed by <br /> laboratory personnel that the required minimum detections limits could not <br /> be achieved. In the future, the detection limits listed in the Tri-Regional <br /> Board Staff Recommendations should be utilized. <br /> 2. Table 2 contained the following errors. <br /> The reporting limit for TPH-gasoline, according to the lab report was 50 ppb <br /> not 0.5 ppb as the table indicated. <br /> Contaminants were detected, but were reported as ND, which indicated that <br /> none were detected. Contaminants that were detected but not reported <br /> included the following: <br /> MW6 - 46 ppb TPH-gasoline and <br /> MW7 - 37 ppb TPH-diesel. <br /> A Urcia.m nf'an f"auwn:.xmr:H<M IIs"I <br />