Laserfiche WebLink
Barnes Trucking -2 - 17 May 2017 <br />1817 S. Fresno Avenue <br />Stockton, San Joaquin County <br />petroleum hydrocarbons and cross contamination. Staff does not concur with the <br />recommended location of boring CPT-1 and requests that you advance this grab sample <br />location near existing well MW-7 or near proposed well MW-12. <br />Staff concurs with the proposed locations of wells MW-12 and MW-13 on the fire station <br />property. On figure 4 of the Work Plan, Stratus presented alternate well locations if <br />access to the fire station property cannot be obtained. If access to the fire station <br />property is denied, please contact Central Valley Water Board staff prior to installing <br />these wells at the alternate locations, to allow staff a chance to aid you in obtaining <br />access to the fire station property. <br />Stratus proposed analyzing groundwater samples for: total petroleum hydrocarbons as <br />gasoline (TPH-G), benzene, toluene, ethylbenzene, total xylenes (collectively BTEX), <br />and methyl tert butyl ether (MTBE). Groundwater samples should also be analyzed for <br />naphthalene. Naphthalene is a chemical of concern at the Site and is currently detected <br />in Site wells. <br />Soil gas sampling should follow California Department of Toxic Substance Control <br />(DTSC) sampling guidelines, as outlined in the April 2012 Advisory Active Soil Gas <br />Investigations. This includes performing both a shut-in test and a purge volume test in <br />addition to the proposed leak detection test. Stratus stated they would perform a tracer <br />gas leak check using iso-propyl alcohol, but did not specify if they would use a shroud or <br />wrap all connection points in saturated cloth. Please include in the results report a <br />detailed description of sampling, including if a shroud or saturated cloth was used for the <br />leak detection test. <br />Stratus proposed analyzing soil gas samples for: TPH-G, BTEX, MTBE, and iso-propyl <br />alcohol. Please add analysis for percent oxygen to the analyte list for soil gas samples. <br />Inclusion of percent oxygen will allow for determination of the presence of a <br />bio-attenuation zone. <br />Provided the above comments are addressed, Central Valley Water Board staff concurs with <br />the scope of work outlined in the Work Plan. Please submit a results report by <br />15 August 2017. <br />If you have any questions or concerns, I may be reached at (916) 464-4792 or by email at <br />vera.fischerwaterboards.ca.gov. <br />1 4' <br />Vei'atischer, P.G. <br />Engineering Geologist <br />cc: Mr. Sriram lyer, Underground Storage Tank Cleanup Fund, Sacramento <br />Mr. Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br />Mr. Scott Bittinger, Stratus Environmental, Inc., Cameron Park