ARCHIVED REPORTS XR0001938 - Laserfiche WebLink

Home Browse Search

o, { t ,r_ u_tf.E 7 '`:i#�.-;5,;�4 �=�,�� st.`,' _4�- ,_ • ' i � ,_"`�= _sT � t ¢ a,, I a' Pr 11'5"May,2001 AGE-NC Project No 97-0312 Page 2 of 4 ` ly On 28 March 2001 and 25 April 2001, the small and large domestic wells on-site were sampled for volatile organic compounds To purge the large domestic well, a drain valve was opened on the water , - storage tank The pump was allowed to cycle on and off for approximately 15 minutes To purge the small domestic well, a faucet between the well and the water holding tank was opened to allow the pump to cycle for approximately 15 minutes ` I 2 2 COLLECTION OF GROUND WATER SAMPLES I z The depth to water was re-measured following purging-to assure a minimum of 80%rechaige prior to sampling Water,samples were retrieved from each purged well using new disposable bailers To - , sample the domestic wells, a sampling port was opened at the well head and samples were collected J from the sampling part while the pump was operating to obtain fresh water samples Each sample [ was transferred into three laboratory-supplied 40-m1 EPA-approved VOA vials containing 0 5 ml ' of 18% hydrochloric acid as a sample preservative and into one 1-liter amber bottle without preservative The samples were labeled,placed in a chilled container and transported under chain-of. custody to McCampbell Analytical Inc (MAI) in Pacheco, a California Department of Health lie , Services (DHS)-certified analytical laboratory The samples were analyzed for , F * Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in ' ' accordance with EPA Methods 5030/8015m.and 3550/8015m, respectively, * Volatile aromatic hydrocarbons - benzene, toluene, ethylbenzene and total xylenes (BTEX) with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 80201602, and J * Volatile organics and fiiel oxygenates - MTBE, ch-isopropyl ether (RIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME) and tert-butanol (TBA) in'accordance with ' EPA Method 8260 modified d Additionally, the 25 April 2001 samples collected from the,'large domestic well and then small domestic well were analyzed for TPH-d and BTEX,'respectively , I , r -1 i ^ 1 J 11 [ 1 f ' 3.0. FINDINGS,' _ [I i M , 1 f _ 'Ground water elevations were determined by subtracting the measured depths-to-water from the surveyed casing elevations (Table 1) Ground,water flow,direction was determined by contouring the water elevations on'a scaled site;plan (Figure 4) Hydrocarbon-impact to,ground water was d ' assessed by laboratory analysis and field observations -' � E q ry r 7 t Advanced GeoEnvironmentai,Inc'