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<Howard.Hold@waterboards.ca.gov > <br />Subject: Re: [EXTERNAL] C00052900 <br />CAUTION: This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the <br />sender and know the content is safe. <br />Hi Claudia, <br />Thanks for the update on the cleanup. I'm including Chris Flower on this e-mail. <br />Chris oversees our Site Cleanup Program and can respond to your question regarding if the case should be <br />referred to us. <br />Thanks, <br />Brendan <br />Brendan Kenny, P.G. <br />Compliance and Enforcement Section <br />Central Valley Regional Water Quality Control Board, R5s <br />From: Muro, Claudia [EHD] <cmuro@sigov.org> <br />Sent: Friday, February 12, 2021 9:31 AM <br />To: Kenny, Brendan@Waterboards <Brendan.Kenny@waterboards.ca.gov> <br />Subject: RE: [EXTERNAL] C00052900 <br />EXTERNAL: <br />Good Morning Brendan, <br />Thank you for your email. I have not abated the complaint yet. The facility completed the excavation of the <br />phosphoric acid spill area. They removed the contaminated soil and gravel (diameter approximately 32 feet with <br />an average depth 18 inches) and generated four (3/4 full) 20 yard bins which also includes waste material that <br />was used to clean out the tank. I observed a concrete layer beneath the soil. Initially, the facility believed only <br />soil and gravel lied beneath the tank. I also visually observed the soil to be fine, so possibly clay. <br />The pH for the ground soil after removal of the contaminated soil was between 4 — 5 pH. Ideally, we want the <br />soil to be between 6 — 8 pH before deeming the cleanup as adequate. <br />Elena Manzo is off today, and I was off yesterday, so I am uncertain if she came to a decision in regards to the <br />cleanup being adequate or if further cleanup will be needed. Elena did ask me to contact you on Wednesday, <br />Feb. 10, to ask if you want this complaint to be referred to you. Please advise. <br />Thank you, <br />&ate DZ. gt,g5C6 <br />Registered Environmental Health Specialist <br />3