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Quik Stop Market No. 121 <br />Page 2 <br />The currently open excavation at the subject site measures <br />approximately 35' x 44' x 33' x 39' and ranges in depth from <br />approximately 12 to 15 feet. There is an existing canopy and <br />concrete slab along the eastern side of the excavation. The <br />western footing of the canopy structure is now exposed and <br />undermined by the collapsing, into the open pit, of the unexcavated <br />pea -gravel that was beneath the concrete slab and canopy footings. <br />The bottom of the excavation currently has several feet of pea - <br />gravel. In addition, the native soil (sand) on the north and <br />northwest side of the excavation collapsed into the excavation <br />during the removal of the tanks and while excavating to collect <br />samples of the native soil. Further excavation to remove the <br />remaining pea -gravel would seriously jeopardize the canopy and <br />could undermine two near -by streets, Union Road and Louis Avenue, <br />as well as a historical landmark that is on the northwest corner of <br />Union Road and Louis Avenue. <br />Based upon this data, Quik Stop has concluded that it would be most <br />prudent to prevent further collapse within the excavation by back- <br />filling the excavation with the stockpiled pea -gravel. It is Quik <br />Stop's and COI's opinions that using the stockpiled pea -gravel will <br />not add to any groundwater contamination that may exist at the <br />site. Quik Stop is aware that further investigation may be <br />required to define the extent of any groundwater contamination at <br />the subject location. Quik Stop intends to cooperate with the <br />County in performing any reasonable and necessary investigation and <br />remediation. <br />CCI is currently in the process of preparing a tank closure report <br />that will include all sampling data from the excavation, stockpile <br />and pump island area as well as all manifests. The report will be <br />submitted to the County once Quik Stop has reviewed and approved <br />the report. <br />If you have any questions or comments, please contact our office at <br />(925) 426-5395. <br />Sincerely, <br />Compliance & Closure, Inc. <br />Gary Mulkey, R.G. 5842 <br />CC: Mr. Michael Karvelot, Quik Stop Markets, Inc. <br />