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TABLE 1 - CHECKLIST OF REQUIRED DATA
<br /> } FOR NO FURTHER ACTION REQUESTS Ar UNDERGROUND TANK SITES
<br /> Site Name and Location: Ponte's Car Wash Case#2,707 E.Yosemite Avenue, Manteca,San Joaquin County
<br /> 1.Distance to production wells for municipal, domestic, agriculture, A sensitive receptor survey in 2002 reported three
<br /> industry and other uses within 2000 feet of the site; municipal supply wells: 4,350 feet west, 1,600 feet
<br /> south and 2,100 feet north of the site.
<br /> ETI 2. Site maps, to scale, of area impacted showing locations of former and existing tank One 8,000-gallon diesel, one
<br /> systems, excavation contours and sample locations, boring and mon! ring well elevation 8,00o-gallon gasoline and one
<br /> contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; 10,000-gallon gasoline USTs
<br /> were removed 2/99.
<br /> Q3. Figures depicting lithology(cross section), treatment system diagrams, Site lithology consists of sand,silt and clay.
<br /> The total depth investigated was 30 feet.
<br /> 4. Stockpiled soil disposed off-site(quantity); An unspecified amount of soil was excavated and transported offsite to
<br /> Forward Landfill.
<br /> 5. Monitoring wells remaining on-site, fate; Three monitoring well (MW-1 to MW-3),installed for this investigation, will
<br /> be properly abandone .
<br /> 6. Tabulated results of all groundwater elevations and depths to wale'.
<br /> The depth to water varied form 19 to 23 feet. The
<br /> r _ _ ---groundavater-flow-direction=is=td-the=west -
<br /> 7. Tabulated results of all sampling and analyses: Maximum soil boring results in 2/99 reported TPHg(18 mg/kg), TPHd
<br /> (1,200 mg/kg), benzene(0.0065 mg/kg), toluene(0.054 mg/kg),xylenes
<br /> e Detection limits for confirmation sampling (0.17 mg/kg), M BE(4.5 mg/kg),and TBA (24 mg/kg). In 1/01,additional
<br /> Lead analyses soil analyses reported all ND. Groundwater maximum grab sample in
<br /> 2/99 reported TPHd(2,000 pg/L)and MTBE(4.5 pg1L). In 11/02,
<br /> groundwater sa mples reported ND for all constituents.
<br /> 8. Concentration contours of contaminants found and those remaining in soil The extent of contamination is defined by
<br /> and groundwater, both on-site and off-site: soil borings and groundwater monitoring
<br /> Lateral and Vertical extent of soil contamination wells.
<br /> Lateral and Vertical extent of groundwater contain! atfon
<br /> Q9. Zone of influence calculated and assumptions used for subsurface Based on the limited extent of soil and
<br /> remediation system and the zone of capture attained for the soil and groundwater contamination,an engineered
<br /> groundwater remediation system; remediation system was not required at
<br /> this site.
<br /> 10.Reports/information Y❑ Unauthorized Release Form F1 Q Rs, 1102 to 11102
<br /> El Boring logs Y❑ PAR El FRP 0 Ott,er
<br /> 11.Best Available Technology(BAT)used or an explanation for not us ng BA T, Remove UST and natural attenuation.
<br /> Y❑ 12.Reasons why background waMs
<br /> unattainable using BAT,' Minor soil contaminate remains on-site.
<br /> LEI'131 Mass balance calculation of substance Mass balance was estinja6edatO.37 gallons of gasoline remaining In soil.—
<br /> treated versus that remaining;
<br /> 0 14.Assumptions,parameters, calculations and model used in risk
<br /> assessments, and fate and transport modeling;and A risk assessment was not required.
<br /> 15. Rationale why conditions remaining at site will not adversely S oil contamination is limited in extent,and based on
<br /> impact water quality, health, or other beneficial uses. 4 ND quarterly sampling events, contamination is not
<br /> leaching to groundwater. Groundwater monitoring
<br /> shows no impact to Water Quality.
<br /> By: Comments: One 8,000-gallon diesel, one 8,000-gallon gasoline and one 10,000-gallon gasoline USTs were removed
<br /> JLB 2199. Multiple borings and three monitoring wells were completed to delineate contamination at this site. Maximum soil
<br /> boring results in 2199 reported TPHg(18 mg/kg), TPHd(1,200 mg/kg), benzene(0.0065 mg/kg), toluene(0.054 mg/kg),
<br /> Date: xylenes(0.17 mg/kg), MTBE(4.5 mg/kg), and TBA (24 mg/kg). In 1/01, additional soil analyses reported all ND.
<br /> Groundwater maximum grab sample in 2199 reported TPHd(2 000 pg/L)and M1BE(4.5 pg/L). In 11/02, groundwater
<br /> 3/4/04 samples reported ND for all constituents,including MtBE. Based on the limited extent of soil contamination and four
<br /> quarters of groundwater analysis, which show a declining treni I in concentrations, Board staff concur with San Joaquin
<br /> County's Closure Recommendation.
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