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Gabriel Gonzalez [EH] From: Nuel Henderson [EH] Sent: Monday, May 04, 2015 2:32 PM To: Gabriel Gonzalez [EH] Subject: RE: 1810 E Hazelton Ave clarification Attachments: Tri-Regional_Appendix_A Analytical Requirements.pdf Gabe, The directed additional analyses are for addressing lack of soil data for the waste oil UST to meet CVRWQCB concerns; we only need one round of the analyses conducted unless something significant is detected. At this time I do not remember directing anything about kerosene and I would think it would be directed if it were identified as a potential COC; at this time, as we did not direct it, I would think we can omit it for SVE-2B and for all samples in future. The SVOC analytical suite should include the chemicals commonly ran for waste oil tanks as identified in the LUFT manual or the Tri- Regional guidelines; I've attached a table from the latter document. Naphthalene is an issue in soil for direct contact or for vapor intrusion, and is not an issue in groundwater. The data indicate that naphthalene is a COC on the site and we should be concerned with it in future soil work, but I don't think we need additional groundwater data for the chemical. Nuel From: Gabriel Gonzalez [EH] Sent: Monday, May 04, 2015 12:47 PM To: Nuel Henderson [EH] Subject: 1810 E Hazelton Ave clarification Hi Nuel, Bill Cook called today and wanted to get clarification on the sampling schedule and analyses for 1810 E Hazelton. He said we had asked him to get some data to address a closed-in-place UST. I reviewed EHD letter November 22, 2013, and saw that MW-1, SVE-213 and MW-2 were to be analyzed for additional analytes, related to waste oil tank#4. The letter is worded such that the requested analysis seemed to be a one-time deal. Neither Bill nor I could determine if that was the intention; please clarify. But still, it looks like the directive has not yet been completely fulfilled.The first sampling event that occurred after the letter's date was performed in April 2014. The table below sums up what I understand of the schedule and analyses. Bill said the November 2014 sampling event report will be uploaded to Geotracker soon, but he told me over the phone what was reported regarding some of the requested analytes. Well ID Requested additional analyses by Actually analyzed (April November 2014 event— letter 11/22/13 2014) per Bill MW-1 TPHmo, SVOCs, naphthalene, diesel, Motor oil (ND), Motor oil (ND),diesel 1,2-DCA naphthalene (1,900), (ND), kerosene (ND), diesel (ND), kerosense 1,2-DCA(?). (I infer no (ND), 1,2-DCA(ND). No SVOCs were analyzed.) SVOCs analyzed. SVE-213 TPHmo, SVOCs, naphthalene, diesel, Well not sampled Well not sampled 1,2-DCA MW-2 1,2- DCA Motor oil (ND), Motor oil (ND),diesel naphthalene (240) , (ND), kerosene (ND), diesel (ND), kerosense 1,2-DCA (?). (I infer no (ND), 1,2-DCA (ND). No SVOCs were analyzed.) 1