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c Associates, Lfd. t1 prs�2 111 RECEIVE® Plan Check Response Letter Nov 2 s 207 architecture engineering Date: November 27, 2017 ENVIRONMENTAL HEALTH DEPARTMENT To: San Joaquin County Environmental Health Department (UST) Project: 1490 S. Main Street; Manteca Chevron — SR0076222 Below are our responses to the plan check comments contained in the email dated November 8, 2017. 1. Drawing FS-1 (and FS-7)identifies that an external audible visual alarm will be installed, however, flapper valves were identified on the revised permit application, please clarify. Aiso, provide the proposed drop tube calculations for the overfill flapper valves. External audible visual alarm is specified for redundancy, but this does not have positive shut-off, and is design preference. See attached proposed drop tube calculations for the overfill flapper valves, which is dependent on tank bury depth so needs to be finalized by the installing fueling contractor. 2. Drawing FS-6, please clarify concrete thickness around the under dispenser containments (UDCs). Sheet FS-6 revised to show 6"thickness. 3. On your sheets please identify the minimum pea gravel thickness to be installed between tank sumps and the concrete to prevent load transfer to the top of the tank(s). Sheet FS-5, revised to show 3 inch. 4. Drawings FS-3, FS-4, FS-5 show that brine sump sensor reservoir will be mounted onto the sump wall. Per the submitted sump cut sheets, these sumps have built-in brine reservoirs and not the external sump reservoirs. Please clarify how these brine sensors will be installed inside STP sumps. Drawings revised for built-in brine reservoir with sensor. 5. Drawing FS-6 identifies that a sump sensor port will be located at the top of the UDC, however, per the submitted Bravo cut sheet the brine sensor port connection is located at the bottom of the UDC, please clarify how UDC brine sensors will be installed and how brine communication will be verified inside the proposed UDC sumps. Please revise and resubmit. Sheet FS-6,detail 1, revised to show connection at bottom. No change to sensor and reservoir location with sight glass. 6. On the revised drawings(for example FS-3 and FS-4)its unclear if the proposed sumps are VPH compliant, for example, no VPH shroud boots and damps are illustrated or identified(refer to the attached illustration). Per the EHD permit application (page 4), detail of sumps and under-dispenser containment to demonstrate vapor tightness"and detail of system that demonstrates it is impervious to water Intrusion"must be provided. Please revise and resubmit. Sheets FS-3 and FS-4 revised to illustrate shroud boots. FS-5 revised also revised to demonstrate imperviousness to water intrusion. 867 Pacific Street, Suite 120 phone (805) 540-5240 San Luis Obispo, CA 93401 fax (805) 540-5241