SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

AlFCrFCNN/CAI ENOINFEAS ANO 0EMOWSrS 1I 1141C. 1380 Nnn'H rnjn•H TR=ET SA.v JOSE.CAL �OMIA ?Si t2 4676 (40aJ M 1180 FAX i409i 432-5177 Proj act No. Z6156.001 28 March 1.994 Mr. John Hughes Citation Homes 4540 Wolf Way Antioch, CA 94509 Subject: GO.5-Acre (Nichola►w) Parcel Byron Road Tracy, California RESULTS OF ENVIRONMENTAL TESTING Dear Mr. Hughes: As muested, we have conducted soil and groundwtiter testing at the sub ect Site. on March 7 , 1994, a groundwater monitoring well. and 9 shallow borings were drilled at the locations shown on Figure 1 (attached) . Soil samples were taken at 5 , 10 and 15 feet in the monitoring wall, at 3 and 8 feet in B-3 , and at 4 or 5 feet in the remaining wells. Three days later the monitoring well was developed by extracting 25 gallons of groundwater. A water sample was then taken. The soil and groundwater samples were then analyzed for TEPH (total extracted petroleum hydrocarbons) and HTEX (benzene, toluene, ethyl benzene and total xylenes) . According to the analytical laboratory, the TEPH test serves to screen for both crude oil and the diesel fractions. The laboratory test results are attached. The only contamination found in the soil samples was traces of xylenes, found in the examples taken from the western half of the site. Although crude oil was not found in the water sample, levels of diesel fuel and all tour of the BTEX fractions ware found. According to David Jenkins of the Region 5 State Regional Water Quality Control Soalyd, the so-called "action levels" for his agency for diesel and benzene contaminations are loo and 4 . 5 parte per billion, respsctively. our test results for the isiater sample indicates contamination levels above these action levels (ug/L ppb - parte par billion) . The tests were run twice in order to obtain a batter level of certainty. .AM.