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j <br /> LABORATORY RESULTS <br /> The water samples for the second round were submitted under chain-of-custody to Supenor <br /> Analytical Laboratory for the following analyses- <br /> May 13 1993 Sam le 73497 to 73499 <br /> ► TPH purgeable by EPA Method 8015M/5030 (gasoline range) <br /> ► Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) by EPA Method 602 <br /> May 26 1993 Sample 73490 to 73491 <br /> ► TPH extractable by EPA Method 8015M/3550 (diesel) <br /> ► TPH purgeable by EPA Method 8015M/5030 (gasoline range) <br /> ► Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) by EPA Method 602 <br /> Superior is certified by the California Department of Toxic Substances Control (DTSC) for the <br /> requested analysis The laboratory data sheets and chain-of-custody forms are attached <br /> None of the analytes were detected above laboratory reporting limits in the second round of <br /> water samples <br /> CONCLUSIONS <br /> Petroleum hydrocarbons were not detected In the second round samples from the monitoring <br /> well MW-1. The first sampling round indicated Iow petroleum hydrocarbon results below <br /> regulatory action limits Since the source of contamination (the tank) and affected soil have <br /> been removed, no additional groundwater assessment is not warranted at this time Kleinfelder <br /> recommends that Cal West Concrete Cutting, Inc request closure of the site from SJCPHS <br /> LE IITATIONS <br /> Kleinfelder performed this investigation In accordance with generally accepted standards of <br /> care which exist in Northern California at this time Conclusions in this report are based on <br /> the analytical results of two water samples collected from MW-1 It should be recognized that <br /> definition and evaluation of environmental and geologic conditions is a difficult and inexact <br /> art. Judgments leading to conclusions and recommendations are generally made with <br /> incomplete knowledge of the subsurface conditions present More extensive studies, including <br /> subsurface investigations, may be performed to reduce uncertainties If Cal West Concrete <br /> Cutting, Inc wishes to continue with this investigation, Kleinfelder should be notified for <br /> additional consultation No warranty, expressed or implied is made <br /> 24-220172-AOO/FR11-72(1993) Page 3 of 4 <br /> Copynght 1993 Klexnfelder, Inc <br /> KLEINFELDER 3077 Fite Circle, Sacramento, CA 95827 (916) 356-1701 <br />