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CONSTRUCTION STING,,& ENGINEERING, INC. <br /> SAN DIEGO,CA RIVERSIDE,CA TRA,CA TRACY,CA I ANCASTER,CA <br /> � <br /> 2414 Vineyard Ave. 490 E Princeland Ct. ]645, ' Ave:tl {I3 2 W.Larch Rd. 42156 10th St W. <br /> O� 4° Suite G Suite 7 > Suite� 5wte 19 Unit K <br /> G Escondido, CA 92029 Corona;CA 91719 Oxnai 1,CA 93033 Tracy,CA 95376 Lancaster,CA 93534 <br /> (760) 746.4955 (909) 371-1890 (805) 486.6475 (209) 839-2890 (805)72{x9676 <br /> ENGINEERING, INC. (760) 746-9806 FAx (909) 371.2168 FAx (805) 486-9016 FAx (209) 839-2$95 FAx (805) 726-9676 FAx <br /> August 11, 1998 CTE Job No. 20-0445B <br /> Mr. Michael J. Infurna, Jr., R.E.H.S. <br /> San Joaquin County <br /> Public Health Services, Environmental Health Divi ion <br /> 304 E. Weber Avenue, Third Floor <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> 2091468-3454 Via Facsimile: 2091468-3433 <br /> Subject: Questions Regarding Chain-of-Custody Documentation and <br /> Laboratory Results <br /> Proposed Cintra Park Phase 11 Development, Tract 2705 <br /> Tracy, California <br /> Reference: Subsurface Investigation, Well Installation, and <br /> Sample Analyses Results <br /> Cintra Park Phase I1 Development, Tract 2705 <br /> Tracy, California <br /> CTE Job Number 20-0445B <br /> July 23, 1998 <br /> Dear Mr. Infurna: <br /> As per your telephone request, we are submitting additional information regarding <br /> laboratory analyses and chain-of-custody documentation shown in the referenced report. <br /> The laboratory information requested was an explanation of low surrogate recoveries for <br /> samples from PMW2 (0.579% and 1.09%) shown on laboratory run# 12169 on the April <br />�-_— -- -�- - <br /> -1-6-, 1-998-laboratory-report from `Chromalab;',In (provided' in Appendix C' of"the' <br /> referenced report). We contacted Chromalab abouL this and they stated that they noticed <br /> this problem during the analysis run and chose tore-run the surrogates as laboratory run <br /> #12186. All surrogates on the re-run were within acceptable limits (Appendix C). The <br /> reported analyses results for well PMW2 shown in Appendix C are from this re-run <br /> (#12186). Therefore, there does not appear to be any quality control concerns with the <br /> data. <br /> The other information requested was,an explanation of chain-of-custody forms from <br /> 3111198, 3112198, 418198, and 5113198 (reference numbers 38685, 38934, 39234, and <br /> 39858, respectively). On these forms, S.S. Teel appeared as the first name on the <br /> GEOTECHNICAL AND CONSTRUCTION ENGIN EKING TESTING AND INSPECTION <br />