|
Alan M. Buehler, P.G.
<br />Engineering Geologist
<br />ATTACHMENT: 7 November 2016 Lett
<br />CALIFO
<br />)
<br />McBillin Real Estate investment - 2 - 12 March 2018
<br />2154 S. El Dorado Street
<br />Stockton, San Joaquin County
<br />MW-8. Please locate borings 8-14 through 8-19 as discussed in the November 2016
<br />letter.
<br />In the November 2016 letter, Central Valley Water Board staff requested that you collect
<br />grab groundwater samples from between 30-40 ft below ground surface in borings B-14
<br />through B-19. However, as shallow well MW-13 is non-impacted, sampling at this depth
<br />is not necessary in borings B-14 and B-15. However, please collect grab groundwater
<br />samples from this depth in borings B-16 through B-19.
<br />The remaining scope of work as discussed in this letter and the November 2016 letter is
<br />as follows:
<br />Location Total
<br />Depth
<br />(ft bgs)
<br />Screened
<br />Interval
<br />(ft bgs)
<br />Soil Sampling Grab Groundwater Sampling
<br />Depth
<br />(ft b_gs_)
<br />Analysis Depth
<br />(ft bgs)
<br />Analysis
<br />MW-11 100A 90-100A Every 5ft, from
<br />80f1 to TD
<br />Lithological
<br />Logging Only 55-65 TPHg, TPHd,
<br />BTEX,
<br />naphthalene,
<br />MTBE, ETBE,
<br />TAME, DIPE, TBA,
<br />EDB, 1,2-DCA
<br />B-14, B-15 125 -- Every 5ft, from
<br />20ft to TD
<br />Lithological
<br />Logging Only
<br />55-65, 90-100,
<br />115-125
<br />B-16, B-17,
<br />B-18, B-19 125 — Every 5ft, from .
<br />20ft to TD
<br />Lithological
<br />Logging Only
<br />30-40, 55-65,
<br />90-100, 115-125
<br />TPHg=total petroleum hydrocarbons as gasoline, TPHd=TPH as diesel; BTEX=benzene, toluene, ethylbenzene, xylenes,
<br />MTBE=methyl tert butyl ether, ETBE=ethyl tert butyl ether; TAME=tert amyl methyl ether; DIPE=di-isopropyl ether; TBA=tert butyl
<br />alcohol; EDB=ethylene dibromide; 1,2-DCA=1,2-dichloroethylene; ft=feet; bgs=below ground surface; TD=total depth
<br />A-May be adjusted based on field observations.
<br />By 29 June 2018, please submit an Assessment Report which details the
<br />installation/advancement of the above discussed well/borings and the resultant findings,
<br />and include recommendations for additional assessment if necessary. In the report,
<br />please include a cross section which depicts Site lithology along a line roughly parallel to
<br />groundwater flow extending from on-site to the furthest downgradient sampling locations.
<br />In addition to lithological data, on the cross section please also include groundwater
<br />analytical data for wells and borings.
<br />If you have any questions or concerns regarding comments in this letter please contact the
<br />undersigned at (916) 464-4615 or by email at alan.buehlerwaterboards.ca.dov.
<br />cc: Sriram lyer, State Water Resources Control Board, UST Cleanup Fund, Sacramento
<br />Michael Kith, San Joaquin County Environmental Health Department, Stockton
<br />Tim Cuellar, Advance GeoEnvironmental Inc., 837 Shaw Road, Stockton 95215
|