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Home My WebLink AboutIRAP (1-30-18)January 30, 2018 Mr. Mohamed Muthana Muthana Corp 11101 State Highway 178 Bakersfield, California 93306 INTERIM REMEDIAL ACTION PLAN FOR THE MESA MARIN CHEVRON 11101 STATE HIGHWAY 178, BAKERSFIELD, CALIFORNIA (BFDOES PERMIT TO OPERATE 015-000-001211 AND PERMIT TO ABANDON 17100005) Dear Mr. Muthana: Complete Fueling Solutions (CFS) was contracted to remove the four lined single-walled steel underground storage tanks (USTs), two two-sided multiple product dispensers (MPDs) on a single island, and associated product and vapor recovery pipelines at the site, and subsequent replacement with three 12,000-gallon double-walled fiberglass USTs, six two-sided MPDs with containment pans on three islands, and double-walled product and vapor recovery pipelines.VVEIR Corp was subcontracted by CFS to conduct soil sampling, laboratory analysis, and preparation of a Tank Closure Report. The service station is operated under Bakersfield Fire Department Office of Environmental Services (BFDOES) Permit to Operate (PTO) 015-000-001211. The tank removal was performed on January 29, 2018 under BFDOES Permit to Abandon (PTA) 17100005. Based upon field observations, significant concentrations of gasoline hydrocarbons are present in the soil beneath and around the locations of both of the former MPDs, and the concentrations of benzene, ethylbenzene, and naphthalene are likely to exceed the maximum concentrations specified in the State Water Resources Control Board’s (SWRCB’s) Low Threat UST Case Closure Policy (LTUSTCCP). Because the impacted sediments are low permeability clay and can not be effectively mitigated using soil vapor extraction techniques, and two of the new dispenser islands are planned to be constructed in the close proximity to these previous MPDs, interim remedial actions in the form of the excavation of the most highly impacted sediments to a depth of 10 feet below grade (fbg) within 15 radially of the sources at the former MPDs will be the feasible and cost effective remedial response in order to comply with the LTUSTCCP. This Interim Remedial Action Plan is being submitted in response to discussions with the Bakersfield Fire Department Office of Environmental Services and the California Regional Water Quality Control Board – Central Valley Region (Central Valley Water Board), which is providing oversight of investigation and mitigation activities at the site. Mr. Mohamed Muthana Muthana Corpl Mesa Marin Chevron January 29, 2018 - Page 2 SITE DESCRIPTION The site is located at 11101 State Highway 178, Bakersfield, Kern County, California (see Figure 1 - Site Location Map). The site is located at the southeast corner of the intersection of State Highway 178 and State Highway 184 (see Figure 2 - Site Vicinity Aerial. The site is identified as Assessor’s Parcel Number (APN) 533-012-24 (see Figure 3 - Assessor’s Parcel Map). The site is at an elevation of 720 feet above mean sea level (MSL), and the topography is relatively flat with a slight slope to the south-southwest toward the ancient Kern Lake bed. The site is located within the northeast quarter of Section 20, Township 29 South, Range 28 East, Mount Diablo Baseline and Meridian. The site was developed as a service station in 1983 and the single-walled steel USTs were lined in 1997 (see Figure 4 – Plot Plan). The property owner is Mr. Mohamed Muthana, Muthana Corp, 11101 State Highway 178, Bakersfield, California, 93306, (661) 366-4886. The general contractor contact is Mr. Mark Blackburn, Sunset Mechanical and Construction, Inc., 4617 Kimber Avenue, Bakersfield, California 93307, (661) 322-0660. The tank removal contractor is Mr. Aaron Koop, Complete Fueling Solutions, 12601 Jasmine Avenue, Bakersfield, California, 93312, (661) 706-8688. The environmental consultant is Mr. Mark R. Magargee, PG, CHg,VVEIR Corp, 3410 Fruitvale Avenue, Suite A, Bakersfield, California, 93308, (661) 631-8347. The Certified Unified Program Agency (CUPA) contact is Mr. Kris Karnes, Bakersfield Fire Department Office of Environmental Services, 1600 Truxtun Avenue, Suite 401, Bakersfield, California 93301, (661) 326-3979. The regulatory agency contact is Mr. John D. Whiting, PG, Central Valley Water Board, 1685 “E” Street, Fresno, California 93706, (559) 445-5504. BACKGROUND GEOLOGY The site is located at an elevation of 720 feet above MSL, and the topography slopes slightly to the south-southwest, toward the ancient Kern Lake bed. The project area is located in the southern portion of the Great Valley geomorphic province. The Great Valley geomorphic province is a northwest-southeast trending valley that is also approximately 400 miles long by 50 miles wide, the southern portion of which is referred to as the San Joaquin Valley. The site is located in the south central area of the San Joaquin Valley where the Sierra Nevada, Great Valley, and Coastal Range physiographic provinces meet the southern end of the Sierra Nevada Province is composed of a massive block of igneous and metamorphic rock of Mesozoic age and older. This Sierran block, 40 to 100 miles wide and 400 miles long, slopes five to seven degrees beneath the San Joaquin Valley. The Coastal Range province on the west consists of tectonically deformed and fractured marine and non-marine sedimentary rocks of Jurassic, Cretaceous, and Tertiary age, which dip eastward beneath the Sand Joaquin Valley. The Great Valley province is a broad asymmetrical synclinal trough, which is known as the Sacramento Valley in the north and the San Joaquin Valley in the south. Mr. Mohamed Muthana Muthana Corpl Mesa Marin Chevron January 29, 2018 - Page 3 Beneath the southern San Joaquin Valley floor, the Sierran plutonic and metamorphic rock block is overlain by consolidated marine rocks of Jurassic and Cretaceous age. These rocks are overlain by continental marine and non-marine sedimentary rocks of Tertiary age, which are comprised of continental deposits of consolidated to semi- consolidated, fossiliferous sandstone, siltstone, and shale which thicken toward the south and west. Unconsolidated continental deposits consisting of Pliocene to Holocene river and lake gravel, sand, silt, and clay sediments, in turn, overlie the Tertiary rocks. Surface features of the floor of the San Joaquin Valley consist of dissected uplands, alluvial fans, overflow areas, and lake bottoms. Dissected uplands lie between the mountains and the nearly flat Valley floor and are manifest in low-lying hills through which perennial and intermittent streams flow. These features consist of reworked older alluvium. The alluvial fans are the sites of active stream deposition of sands and silts derived from the Sierra Nevada and the dissected uplands. The overflow lands and lake bottoms lie in the central part of the Valley where silt and clay accumulate in quiet lake and marsh environments. Surface soils are classified by the Soils Conservation Services as Kimberlina - Urban Land - Cajon Complex and are characterized as 35 percent Kimberlina fine, sandy loam ; 30 percent Urban land with impervious surfaces and altered fills; and 20 percent Cajon loamy sand. HYDROGEOLOGY The site lies within the Kern County Basin of the San Joaquin Basin Hydrologic Study Area within the Tulare Lake Hydrologic Region (Basin), which is not an adjudicated basin but is managed under a Basin Plan. Bounding the subbasin are the Kern County line and the Tule Groundwater subbasin to the north, Sierra Nevada foothills and Tehachapi Mountains to the east, San Emigdio Mountains to the south, and Coast ranges to the west. The groundwater basin is comprised of deposits of clay, silt, sand, and gravel and consists of four water bearing formations: Olcese and Santa Margarita Formations, Tulare and Kern River Formations, Older Alluvium/Stream and terrace Deposits, and Younger Alluvium/Flood Basin Deposits. The subbasin has a surface area of 3,040 square miles, and receives average precipitation of 5 to 13 inches annually. The site lies within the Kern County Basin of the San Joaquin Basin Hydrologic Study Area (Basin). The site is located within Kern County Improvement District No. 4. Surface water and groundwater in the San Joaquin Valley are derived predominantly from the Sierra Nevada to the east, and are transported by five major rivers, the southernmost being the Kern River. The subject site is located approximately two miles south of the Kern River. The site is not located within a Federal Emergency Management Agency (FEMA) 100 or 500 year flood zone. Mr. Mohamed Muthana Muthana Corpl Mesa Marin Chevron January 29, 2018 - Page 4 The Kern County Water Agency (KCWA) publishes annual maps showing the depth to water, and groundwater quality for groundwater basins within Kern County. The depth to the regional unconfined aquifer is estimated to be in excess of 150 fbg at the site, and the groundwater gradient is to the south-southwest toward the ancient Kern Lake bed. Perched groundwater at depths as shallow as 20 feet is known to be present flanking the current course of the Kern River, but is not known to extend to the site. There are several municipal water supply wells located within a mile of the site. The groundwater is considered to be potable and suitable for beneficial use. The Central Valley of California is underlain by a broad, thick hydrogeologic unit, which consists of soil and rock with varying porosity and permeability. Physical dimensions are approximately 50 miles wide at the widest point in the Valley, 400 miles long, and as much as 2,000 feet deep. Recharge to regional aquifers consists of infiltration of seasonal precipitation and percolation of surface waters. The Valley aquifer of greatest storage, highest quality, and greatest accessibility for domestic and agricultural use consists of the alluvial and lacustrine continental deposits extending to the depths of 1,500 to 2,000 feet beneath the San Joaquin Valley floor. Lithologic and hydraulic properties of these sediments are largely the product of the sediment source and the depositional environment. These sediments range in size from clays to boulders and include all mixtures between the extremes. Those of the west side of the Valley are derived largely from the Coastal Ranges, which tend to consist of shales and fine sandstones with limited permeability. The east sediments are derived mainly from granitic materials of the Sierra Nevada which are generally coarser and much more permeable. The near surface sediments encountered during the tank removal were very low permeability clays to the total depth exposed. INTERIM REMEDIAL ACTION PLAN The tank removal was performed on January 29, 2018 under BFDOES PTA 17100005. Based upon field observations, significant concentrations of gasoline hydrocarbons are present in the soil beneath and around the locations of both of the former MPDs, and the concentrations of benzene, ethylbenzene, and naphthalene are likely to exceed the maximum concentrations specified in the SWRCB’s LTUSTCCP. In association with the removal of the USTs, MPDs, and piping, potholes were excavated at locations ten feet to the northwest, northeast, and southeast of the MPDs. The base of the potholes indicate that the gray stained most highly impacted soil is confined to a depth of less than 10 fbg, but extend to greater than 10 feet radially from the former MPDs (see Attachment 1 for a Photographic Log). Because the impacted sediments are low permeability clay and can not be effectively mitigated using soil vapor extraction techniques, and two of the new dispenser islands are planned to be constructed in the close proximity to these previous MPDs, interim remedial actions in the form of the excavation of the impacted sediments to a depth of 10 fbg within 15 radially of the sources at the former MPDs will be the feasible and cost effective remedial response in order to comply with the LTUSTCCP (see Figure 4 for the proposed limits of excavation). FIGURE 1 - SITE LOCATION MAP SITE LEGEND REVISED: JANUARY 30, 2018: mrm VEIR Corp MR. MOHAMED MUTHANA MESA MARIN CHEVRON11101 STATE HIGHWAY 178BAKERSFIELD, CALIFORNIA FIGURE 2 - SITE VICINITY AERIAL SITE LOCATION LEGEND VEIR Corp MR. MOHAMED MUTHANA MESA MARIN CHEVRON11101 STATE HIGHWAY 178BAKERSFIELD, CALIFORNIA FIGURE 3 - ASSESSOR'S PARCEL MAP SITE LOCATION LEGEND VEIR Corp MR. MOHAMED MUTHANA MESA MARIN CHEVRON11101 STATE HIGHWAY 178BAKERSFIELD, CALIFORNIA SOIL SAMPLE LOCATION FIGURE 4 - PLOT PLAN U S T S M E S A M A R I N C H E V R O N STATE HIG H W A Y 1 7 8 D I S P E N S E R S LEGEND VEIR Corp MR. MOHAMED MUTHANA MESA MARIN CHEVRON11101 STATE HIGHWAY 178BAKERSFIELD, CALIFORNIA STOCKPILE 0 10 20 1 inch = 20 ft. ( IN FEET ) NWD SED TK3-SW TK2-SWSP-1 TK4-SW TK4-NE TK1-SW TK1-NE TK2-NE TK3-NE SP-1 SP-2 SP-2 PROPOSED LIMITS OF EXCAVATION ATTACHMENT 1. 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