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p <br /> "URS <br /> Ms.Vicki McCartney, REHS Page 2 <br /> San Joaquin County Environmental Health Department <br /> March 11, 2004 <br /> County Comment #3: Air sparing well AW-9 was inadvertently omitted from Figure 2 in both work <br /> plans submitted to EHD. <br /> URS Response: Figure 2, as included in an attachment in this letter shows well AW-9. <br /> County Comment #4: To my knowledge, there is no information that confirms that groundwater is at <br /> 100 feet. The Work Plan for Groundwater Monitoring and Remediation Well Installation does not <br /> address the criteria to be used for determining the screen interval at about 100 feet for the one deep <br /> monitoring well. <br /> URS Response: URS plans to screen the,proposed deep groundwater monitoring well in a saturated <br /> sand horizon at or near approximately 100 feet below ground surface (bgs) for the purpose of defining <br /> the vertical extent of petroleum hydrocarbon impacts down gradient of the site underground storage tank <br /> (UST) complex. If a saturated sand unit is not encountered near 100 feet bgs, URS will drill deeper <br /> until a saturated sand unit is encountered where a well can be screened. Depth to first water at the site is <br /> approximately 45 feet bgs. <br /> If you have any questions or comments regarding this letter, please call Mr. Jeff Brooks at <br /> (916) 679-2383. <br /> Sincerely, <br /> URS Corporation Americas <br /> Jeff Brooks Vernon Elarth,RG <br /> Staff Geologist Project Manager <br /> Enclosures: Figure 1 Site Location Map <br /> Figure 2 Proposed Well Locations <br /> Attachment A SJCEHD Correspondence <br /> Attachment B Health and Safety Plan <br /> cc: Mr. Paul Supple, Atlantic Richfield Company <br /> Mr. James Barton, RWQCB-CVR <br /> Project File <br /> KAWprocessV5 BP ARCO\021861Workplanl2186 Response to Comments 04.doc <br />