HomeMy WebLinkAbout[Untitled]_5-58Mr. Yam Haing
2612 Buck Owens Blvd LLC
January 25, 2013 - Page 5
DISPENSER UPGRADE SOIL SAMPLING
On January 9, 2013, the dispenser pans and product piping were removed from the site. TE-T . Cary
was contracted to provide a California Professional Geologist to collect soil samples at the direction of
Mr. Ernie Medina with the BFD OES. Soil samples NWD -2 and NWD -6, SWD -2 and SWD -6, SED -2 and
SED -6, and NED -2 and NED -6 were collected from 2 and 6 feet beneath the northern and southern MPDs
on the western and eastern islands, respectively; soil samples SWP -2 and SWP -6, SEP -2 and SEP -6,
and NEP -2 and NEP -6 were collected from 2 and 6 feet beneath the southwestern, southeastern, and
northeast piping elbows, respectively; and soil samples WCP -2 and WCP -6, SCP -2 and SCP -6, and
ECP -2 and ECP -6 were collected from 2 and 6 feet beneath the centers of the western, southern, and
eastern piping runs, respectively (see Figure 4 for the sample locations). All sampling equipment was
washed with a non- phosphate cleanser, pre - rinsed with tap water, and finally rinsed with deionized water
prior to sampling. The soil samples were collected from the backhoe bucket. The soil samples were
stored in 2- inch - diameter brass tubes, sealed with Teflon TM liners and end caps, labeled, placed in an ice
chest at a temperature of less than 4 "C, and transported to a California State - certified laboratory for
analysis. Sample identification and chain -of- custody procedures were followed for the samples to ensure
sample integrity and to document sample possession from the time of collection to the ultimate
destination. The sample labels identified the job number, sampler, date and time of collection, and a
sample number unique to each sample.
The soil samples were analyzed at Moore Twining Associates, Inc. (MTA) for total petroleum
hydrocarbons (TPH) as gasoline, BTEX, methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA),
diisopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), ethylene
dibromide (EDB), and 1,2- dichloroethane (1,2 -DCA) using Environmental Protection Agency
(EPA) Method 8260. TPH as gasoline was detected in five of the 20 samples, reaching a maximum
concentration of 43 mg /kg in sample NED -2 collected from two feet below the northeastern dispenser.
However, TPH as gasoline was detected at a concentration of only 3.5 mg /kg in sample NED -6 collected
from six feet below the northeastern dispenser. Benzene was detected in only one of the 20 samples, at a
concentration of 0.018 mg /kg in sample NED -6. Toluene was detected in six of the 20 samples, reaching
a maximum concentration of. 1.4 mg /kg in sample NED -2. However, toluene was detected at a
concentration of only 0.14 mg /kg in sample NED -6. Ethylbenzene was detected in five of the 20 samples,
reaching a maximum concentration of 0.72 mg /kg in sample NED -2. However, ethylbenzene was
detected at a concentration of only 0.068 mg /kg in sample NED -6. Total xylenes were detected in seven
of the 20 samples, reaching a maximum concentration of 4.6 mg /kg in sample NED -2. However, total
xylenes were detected at a concentration of only 0.46 mg /kg in sample NED -6. MTBE was detected in
only one of the 20 samples, at a concentration of 0.0016 mg /kg in sample ECP -6 collected from six feet
below the center of the eastern piping run. TBA, DIPS, ETBE, TAME, EDB, and 1,2 -DCA, were not
detected in the 20 soil samples (see Table 1 — Summary of Soil Sample Analytical Results and
Attachment 4 for the Laboratory Report).