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Stantec •
<br /> Quarterly Status Summary Report-First Quarter 2011
<br /> Stockton Charter Way Commingled Plume
<br /> April 13, 2011
<br /> warehouse building; no USTs or fuel dispensers are present on the property. The ARCO-
<br /> branded service station [former Texaco (Shell)] is currently comprised of a station building, a car
<br /> wash, four fuel dispenser islands, and four USTs. This station is currently anticipated to be
<br /> redeveloped during the summer of 2011. No changes have been made to the previous
<br /> investigations and site history since the last report submittal [Site Conceptual Model (SCM),
<br /> January 14, 2011].
<br /> Sensitive Receptors
<br /> There are no known water wells within one quarter mile of the Site. The nearest surface water
<br /> body is the Mormon Slough, located approximately 2,800 ft to the north-northeast and down-
<br /> gradient of the Site.
<br /> Monitoring and Sampling
<br /> Upon approval of the Further Assessment Work Plan (Work Plan), dated February 15, 2011,
<br /> there are a total of 30 groundwater monitoring wells sampled semi-annually during the second
<br /> and fourth quarters and a total of 16 wells sampled annually during the second quarter as
<br /> summarized in the following table. No groundwater monitoring and sampling was conducted
<br /> during 1Q11.
<br /> Frequency Well Number
<br /> AMW-1 through AMW-3, AMW-5 through AMW-9, AMW-1 B,
<br /> Semi-annual (second and AMW-813, AMW-1C, AMW-8C, AMW-11, CMW-4A through
<br /> fourth quarters) CMW-7A, CMW-7B, CMW-5C, CMW-7C, SLVE-1, SMW-3,
<br /> SMW-3-79, SMW-3-119, SMW-10-81, SMW-11-82, SMW-19-81,
<br /> SMW-20-83.5, SMW-21-80, SMW-22-80
<br /> CMW-4C, CMW-6C, SLMW-1A through SLMW-4A, SLMW-8-87,
<br /> Annual (second quarter) SLMW-9-120, SMW-2, SMW-8, SMW-10-117, SMW-11-122,
<br /> SMW-14, SMW-15, SMW-19-120, SMW-23
<br /> Current Assessment Activities
<br /> No assessment activities were conducted at the Site during 1Q11.
<br /> Monitoring wells SMW-20-83.5 and SMW-23 were reconfigured on March 18, 2011 to protect
<br /> them from damage during property redevelopment activities at 378 West Charter Way in
<br /> Stockton, California. Stantec supervised WDC Exploration and Wells (WDC) of Zamora,
<br /> California in reconfiguring the wells. WDC air-knifed the soil approximately 1.5 feet in diameter
<br /> around the wells to approximately three feet below ground surface (bgs). WDC then cut and
<br /> capped the well casings at approximately two feet bgs, covered the well casings with Morrison
<br /> well vaults, and backfilled the hole with sand to approximately one feet bgs and native soil to
<br /> ground surface. San Joaquin County Environmental Health Department supervised the
<br /> backfilling.
<br /> Remediation Status
<br /> There is no active remediation operating at the Site.
<br /> Stockton Charter Way Commingled Plume QSSR 1 Q11.doc 2
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