Laserfiche WebLink
07 October 2013 <br /> AGE Project No. 13-2914 <br /> Page 4 of 5 <br /> soil-vapor sample collected from B2. <br /> Analytical results of soil samples are summarized in Table 1;analytical results of soil-vapor <br /> samples are summarized in Table 2. The laboratory reports (CTEL Project Nos. CT214- <br /> 1309087, 13090878, and 1309082),quality assurance and quality control(QA/QC)reports, <br /> and chain of custody forms are included in Appendix B. <br /> CONCLUSIONS/RECOMMENDATIONS <br /> Based on the data collected from this investigation, AGE concludes: <br /> • PCE was detected at low concentrations (0.01 through 0.14 mg/kg) in shallow soil <br /> samples collected from borings B1 through B4 (one foot bsg in B1 through B4 and <br /> four feet bsg in B2).The PCE detections are below the San Francisco Bay Regional <br /> Water Quality Control Board Environmental Screening Level (SFBRWQCB ESL) <br /> residential and commercial values of 0.55 mg/kg and 0.70 mg/kg, respectively. <br /> • PCE was detected at a concentration of 1.0 pg/I in the soil-vapor sample collected <br /> from B1; the PCE detection is just above the California Human Health Screening <br /> Level (CHHSL) commercial value of 0.603 pg/I for PCE in soil-vapor. <br /> Based on the samples collected from the site, AGE recommends that a human health risk <br /> assessment (HHRH) be prepared for shallow soil-vapor samples, using the soil-vapor <br /> concentration detected in boring B1. <br /> LIMITATIONS <br /> AGE's professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar localities. The findings <br /> were based primarily upon analytical results provided by an independent laboratory. <br /> Evaluations of the geologic/hydrogeologic conditions at the subject property for the <br /> purpose of this investigation were made from a limited number of available data points(i.e., <br /> soil borings,soil samples, soil-vapor samples)and subsurface conditions may vary beyond <br /> these data points. No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report. <br /> Advanced GeoEnvironmental,Inc. <br />