|
TA:'`:��E 1 - CHECKLIST OF EQUIRED'UATA
<br /> FOR NO FURTHER ACTION REQUESTS 'T UNDERGROUND TANK SITES
<br /> Site Name and Location: California Cedar Products, 1340 W.Washington Street, Stockton,San Joaquin County
<br /> 1. Distance to production wells for municipal, domestic, agriculture, Site is located at Port of Stockton with one private well
<br /> industry and other uses within 2000 feet of the site; 2000 feet upgradient and no public wells within 2000
<br /> feet.
<br /> 0 2. Site maps, to scale, of area impacted showing locations of farmer and existing tank
<br /> systems, excavation contours and sample locations, boring and monitoring well Soil contamination reported under
<br /> elevation contours, gradients, and nearby surface waters, buildings, streets, and diesel UST No. 2 after removal in
<br /> subsurface utilities; 91/90.
<br /> 3. Figures depicting lithology(cross section), treatment system diagrIms; Site lithology consists of sand,sift and clay to
<br /> 34 fee; the Iotal depth investigated.
<br /> 4. Stockpiled soil disposed off-site(quantity);
<br /> The amount of s !removed during the USTs removal was not reported.
<br /> Q5. Monitoring wells remaining on-site, fate;
<br /> Monitorings wells were not required or installed.
<br /> FN-]-:'6.'.Tabulated-results-of-all groundwater elevations grid depths'to water•-;-,YThe reported depth-to.water-was-16 feet.for one.--� -
<br /> grab sample in 2003,and varies from 20 to 25 feet
<br /> at adjacent sites In the Port of Stockton.
<br /> 7.Tabulated results of all sampling and analyses. Analytical resu is of confirmation soil samples collected at the time of
<br /> the USTs remoral for UST No. 2 were TPHd, 6,900 mg/kg,
<br /> EY Detection limits for confirmation sampling ethylbenzene, 0.037 mg/kg,and xylenes, 1.4 mg/kg. Analysis of one
<br /> N Lead analyses grab groundwater sample taken in 2003 reported TPHd,4,300 lig/L,
<br /> toluene 1.7 pg/ ,and xylenes,3.9 Ng/t. MtBE was not detected.
<br /> 0 8. Concentration contours of contaminants found and those remainfn in soil
<br /> and groundwater, both on-site and off-site: The confirmation soil samples and on-site
<br /> ®Y Lateral and Y Vertical extent of soil contamination soil boring define the extent of soil
<br /> Lateral and ® Vertical extent of groundwater contamr ation contamination.
<br /> N7 9.Zone of influence calculated and assumptions used for subsurface Based on the limited extent of soil
<br /> remediation system and the zone of capture attained for the soil and contamination,an engineered remediation
<br /> groundwater remediation system; system was not required.
<br /> YD 10.Reports l information Y❑ Unauthorized Release Form QI4Rs
<br /> Y❑ Boring logs l PAR N❑ FRP her Additional Soil& GW Investigation & Well Survey
<br /> Y� 11.Best Available Technology(BAT)used or an explanation for not using BAT,' Soil excavation and natural attenuation.
<br /> Y� 12.Reasons why background was4s
<br /> unattainable using BAT, Minor loll and groundwater contamination remains onsite.
<br /> - _
<br /> 13.Mass balance calculation substance
<br /> treated versus that remaining;; Mass balance was not calculated for soil or groundwater.
<br /> 14.Assumptions,parameters, calculations and model used in risk
<br /> assessments, and fate and transport modeling,and risk assessment was not required.
<br /> 15. Rationale why conditions remaining at site will not adversely Soil and groundwater contamination is limited in extent.
<br /> impact water quality, health, or other beneficial uses. fjhe site is adjacent to a USEPA Superfund cleanup
<br /> (McCormick and Baxter), which impacts groundwater
<br /> i nder site. There are no sensitive receptors within 2,000
<br /> feet
<br /> By: Comments: Confirmation sample analyses from one 1,000-gallon gasoline tank removed 9/87, and one 12,000 diesel
<br /> ]LB and two 5,000-gallon gasoline USTs removed 11/90 reported no contamination in soil. Soil contamination was
<br /> reported during removal of a fifth tank,a 12,000-gallon diesel UST(No. 2)at the subject site in 11/90. TPHd
<br /> Date: (6,900 mg/kg), ethylbenzene(0.037 mglkg), and xylenes(1.4 mg/kg) were detected in UST No. 2 confirmation soil
<br /> 5121/04 samples at 13 feet bgs. Grab groundwater sample results from 16 feet bgs in 2003 revealed TPHd(4,300 Ng/L),
<br /> toluene(1.7 pg/L), and xylenes(3.9 pg/L). Depth to groundwater typically varies from 20 to 25 feet bgs at nearby sites
<br /> at the Port of Stockton. A laterally continuous clay zone a fists from 20 to 30 feet bgs. Based on the minor soil and
<br /> groundwater contamination, Regional Board staff concur With San Joaquin County's Closure Recommendation.
<br />
|