|
r
<br /> -
<br /> CALIFORNIA GEOPHYSICAL GROUP, INC.
<br />' O Box 578341, Modesto, CA 95357 �, Tel (209) 527-1247
<br /> -�
<br /> January 26, 2005 3N Fax (209) 527-4810
<br />'
<br /> Public Health Services
<br /> RE(Cmym
<br /> San Joaquin County FE13 0 9 2005
<br /> 304 East Weber Ave 3rd Floor
<br /> Stockton, CA 95202 ENVIRONMENT I�EALTH f
<br /> PERP41T/,,),cpViCES
<br /> RE Quarterly Report January 2005
<br />' Darpetro, Inc USA Service Station
<br /> 749 E Charter Way
<br /> Stockton, CA
<br />'ra Site No 1060
<br />' This site was sampled on January 11, 2005 Sherwood Labs of Hilmar, California
<br /> analyzed the samples, their reports are attached
<br /> Table 1 lists the history of the water table depths, elevations, water analyses and oxygen
<br />' levels at this site since January 26, 1990 Table 2 lists the hydraulic gradients and
<br /> bearings Sampling protocols are included
<br /> 10
<br /> FINDINGS
<br /> The groundwater gradient bearing is N 85 E and the gradient is 0 0001 Ft/ft See Table 2
<br />' and Figure 1
<br /> Each well was measured for depth of water prior to any wells being purged The depth to
<br /> water in the first measurement is written and noted on the sample sheets
<br />' The groundwater in wells MW-1, MW-5, MW--6, MW-7, MW-8, MW-9, MW-10, and MW-11
<br /> were above California Drinking Water Standards for benzene The benzene plume
<br /> appears to be flowing north around well MW-1 Wells MW-7 and MW-9 are contaminated
<br /> from sites, west of this site See Figure 2
<br /> The wells which had TPH are MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8,
<br /> I MW-9 MW-10, MW-11 and MW-13 Wells MW-4, MW-7 and MW-9 are contaminated
<br /> from sites entering this site from a source west of this site See Figure 3
<br /> MtBE was recorded in wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-7, MW-8, MW-9,
<br />' MW-11 and MW-13 Wells MW-3, MW-4, MW-6, MW-8, MW-12 and MW-13 had levels
<br /> under 5 ug/L
<br /> Dissolved oxygen levels were recorded this quarter The measured levels are shown on
<br /> Table 1 and Figure 5
<br /> On October 16, 2004, we submitted a revised work plan for the drilling of additional wells
<br /> and a boring at this site
<br /> (•
<br />
|