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Home My WebLink About1982-05-18; City Council; 7012; SDG&E 5 YEAR AIR MONITORING REPORTAB# ’70/ 2 TITLE: SDG&E 5-YEAR AIR MONITORING REPORT MTG. 5/18/82 DEPT. pL DEPT. 31 CITY AT CITY MG a LJ 2 0 a a a 4 .. z 0 5 5 a z 3 0 0 /. ci kw CARLSiAi” AGENDb, ILL % RECOMMEN OED ACTION: The Planning Staff reconmends that; the City Council accept the attached report as satisfying the conditions of Specific Plan, SP-l44(B). ITEM EXPLANATION This item is a report on compliance of conditions of approval c Specific Plan amendment, SP-l44(B), for the Encina Power Plant. Conditions of SP-l44(B), which approved the 400’ single stack, required air pollution equipment to be placed in service to monitor emissions from the Encina Plant. This equipment has b< operating for five years, monitoring nitric oxides, sulfur dioxide and suspended particulate matter. A further condition of approval of SP-l44(B) required a report compliance with air quality standards to be prepared by the Sal Diego County Air Pollution Control District and forwarded to tl city Council. Attached, for your review, is the APCD Report s marizing the results of the five year monitoring program, Con- ducted from March 1977 through February 1982. The program was established to monitor and analyze the impacts the single tall stack on overall air quality in areas likely t be affected by Encina’s emissions. The APCD report indicates that the 400’ “tall stack” has resulted in a slight improvemen in air quality in the area adjacent to the plant. A representative from APCD will make a brief presentation and be available to answer questions at the meeting. ENVIRONMENTAL IMPACT Not applicable to this report. FISCAL IMPACT No fiscal impacts would be created by this report. EXHIBITS 1. Air Ylonitoring Program, Encina Power Plant - 1977-1982, Summary Report from San Diego Co Air Pollution Control District w ii I 1 I I I I I I I 1 I I I 1 1 1 I I AIR bKIi’4ITORiiHG PROGRAX ENCIHA POYER PLANT - 1977-1982 I SU’rli4WRY REPORT SAN DIEGO COUI‘ITY AIR POLLUTION CONTROL DISTRICT -1 -,- -- >‘ ,p‘i i J -- -/ - Ad %& -” aeb(elOpiE?eiiLa; &,,‘,, ~ APRIL, 1982 b - 1 I SUMMARY Air quality in the vicinity of the San Diego Gas & Electric (SDG&E) Cornpan. power plant has been monitored by the San Diego County Air Pollution Contr District from March, 1977 through February, 1982. This was dorte to assess air quality impact of the 400 foot combined effluent stack at the Encina P Plant. modification of the facility to add a fifth boiler and a 400 foot stack. I I I I I I 1 1 I 1 1 E I The five year period included one year of air monitoring prior to The air monitoring data shows that the addition of the "tall stack" has resulted in a slight improvement in air quality in the area adjacent to ti71 1 plant. B ACKGROU fd D On April 27, 1976, the Carlsbad City Council required that air quality be monitored for five years in areas that would likely be impacted by ernissior from SDG&E's proposed 400 foot Encina Power Plant stack. This was done as condition of an Amendment to a Specific Plan (SP-1441 which allowed constri tion of a fifth boiler and "tall stack'' at the Encina facility. Subsequenj the Air Pollution Control District operated a thres-station air monitor-ing network in the area of -the Encina Power Plant frorn March, 1977 through February, 1952. expected maximum erni ssions impact and exposure fran the "tal 1 stack". station was equipped to monitor nitric oxide (NO), nitrogen d'ioxide ()IO2) , total oxides of nitrogen (NOx), sulfur dioxide (SO 1 and total suspended particulate matter (TSP) . has been paid for by SDG4E. 1 I The siting of the stations was based on the location of tl Eact 2 The i nstall ati on and operation of these stations I Station locations are as follows: 1 .a u - I B I I I I I I I I STATION NO. 1: identified as San Francisc:, Peak (shown as 1 on map), i: located approximately 5 miles northeast OF the Encina PI at an elevation of 525 feet above sea level. This yaw; area was projected to be the location of maximum impact the pol 1 utants ellni tted fro2 the modified faci 1 i “cy under “worst case’’ meteorological conditions. identified as Encina Vista (shown as 2 on map), is local 1.5 miles directly east of the Encina Plant at an eleva-i of 200 feet above sea level. This site was selected to show the localized impact of the facility prior to its modi f i cati on. identified as Greenwood Hills (shown as 3 on map), is located 7.2 miles east of the Encina Plant at 630 feet STATION NO. 2: I STATION NO. 3: above sea lzvel . typical impact of the modified facility undzr expected meteorological conditions. It was selected considering distance from the stack and the westerly direction of tl This sIte was expected to show the mo: 1 I prevailing wind. I The ai r monitoring network has operated continuously si nce illarch 1977 e Ail quality data for these locations covers a one year period prior to plant m( fication, a five month period during the construction and testing of boilel I I 1 1 I Unit No. 5 and the “tal’l stack” and a three and a half year period of plan operati on i n i ts present conf i gu rati on. 2 w v RESULTS Air Quality dat? for each site for 1979, 1980 and 1981 were graphed to shoh frequency di strf butions at differert pol 1 utant 1 evel s (pages 6-23 1. Each graphical presentation provides a direct comparison of air quality imp frequency and level with a baseline year of data collected from April 1977 !larch 1978 before the stack modi fi ca ti on, The method chosen to demonstrate air quality changes is the same as that LIS( in th: District' s 1980 interim report. Maximum pol 1 u-tant 1 evel s measured e, day were recorded. Percentages of days exceeding each pollutant level were p7 otted agai fist the pol 1 utant 1 evel exceeded. For example, in Figure lA, the shaded area A indicates that 63 percent of dt mani tored had peak sul fur dioxide level s of 1 pphin or above in the year befc the sldck. r!odifica'tion. The hatched area B indicates that 46 percent of dah had peak sulfur dioxide levels of 1 or above in 1979. Thus the nunber of da where a masurable plume impact is seen was fever in 1979 than before nodification. In reviewing the comparisons, it should be noted that sulfur dioxide impacts are the result OF po,rier plant emissions while nitrogen dioxide levels" reflei emt'ssfons from a variety of sources, including power plants. Atiy changes in air quality caused by the plant modification are more easily preceived as sul fur dioxide ai r qual i ty changes. *All IdC12 da-ected prior to January 1, 1980 has been corrected to ref1 ect current cal i brati on techni ques. 3 u - 1 1 1 1 1 1 I I I I 1 1 I 1 1 I SAN FRANCISCO PEAK The data shown in Figures 1A-F (pages 6-11) indicates that the local impact ( the Encina Power Plant was reduced slightly for SO were lower in each of the three years after the modification than in the yea] before the modification. 2 Peak levels of SO 2' Air quality for NO2 also improved but to a smaller extent. ENCIMA VISTA The air quality data in Figures 2A-2F (pages 12-17) shows a marked improvene Frequency of impact for SO2 has decreased. At levels above 5 pphm, this fre quency was reduced by at least 25 percent. Monitored peak values were rzduc l by more than 50 percent. Nitrogen dioxide levels also showed improvemente Greenwood Hi 11 s Over three years of ai r moni tori ng after plant modi fica-ti on an i nsigni f ican-i improvement in frequency of impact was demonstrated for SO2 at the Greenwooc Hills station. maxiinurn peak values in two of the three years (1980 and 1981). pattern is shown for nitrogen dioxide. 1 Figures 3A-F (pages 18-22) show a wry slight reduction in A similar Total Suspended Particulates Particulate levels at the monitoring sites downwind of Encina do not show a unusual trends or changes which can be associated with the stack modifica- ti on. E 4 W - TOTAL SUSPENDED PARTICULATSS Annual Geometric Mean ( g/m ) _I_ Site 1977 1978 1979 1980 Year prior to Modification 198 _I 82 88 85 95 95 Oceanside Escondi do San Francisco Peak Encina Vista Greenwood Hi 11 s 86 78 78 72 76 49 61 65 66 60 72 84 72 65 62 63 67 5 FIGURE 1A -d - I 100 I I I I I I I I 1 1 1 10 I 1 i Sari Francisco Peak 90 SO2 Peak Values 80 April 1977 - March 1978 January - December '1979 rsj - I 70 NOTE: Data indicates a general improve ir. air quality for SO2 after pli modification. There is a lower 60 qwncy of LiluL-ae imgact, and a s: =eduction in the maxiruuxi - pea:< vc recorded - I X Values 50 Exceeding 40 1 30 20 0 2 4 6 8 10 12 14 16 18 20 22 24 2t Peak Value PPHM I 6 - E'LbUrn I 1 eo Sari Francisco Peak 90 SO2 Peak Values 80 April 1977 - March 197 /SJ January - December 798( 70 NOTE: Data indicates a general imnrovt in air quality for S02. Althoucil is a sliqht increase in frecluenc irngact, this does not rewesent air quality woblem. The sliqhl duction in the naximum geak valt corded continues to be seen. 60 % Values 59 Exceeding 40 30 20 10 02 4 6 8 10 12 14 16 18 20 22 24 26 ?eak \!slues PPHX ? \ I 9 FIG[ 8 100 I I Sari Francisco Peak So2 Peak Values I April 1977 - Rarch I [Sj January - Cecember NOTE: Data indicates a general im! in air quality after nodifil Although there is a higher : of Plume imnact at levels 01 and below, these would not c air quality problem, I i I I I 8 I I I I % Values 50 l Exceeding O 2 4 6 8 10 12 14 16 J8 20 22 24 Peak Values I PPHM I 8 w FIGURE 11 100 San Francisco Peak 1402 Peak Values 90 80 flpril 1977 - March 1978 B January - December 1979 70 NOTE: Data indicates a general improve in air quality. 6 0 % Values 50 Exceedi ncj 40 30 28 10 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Peak Values PPHM 9 CJ r1kIum la - 100 I I I 1 1 I I I I 1 I 1 1 20 I 1 1 I I 1 10 Sari Francisco Peak NO? Peak Values 90 80 April 1977 - March 1978 e= January - December 19e;O 70 NOTE: Data indicates a higher frequenc. im?act of values between 5 pphm c 8 ?phm, with a reduced frequency 60 8 DDhm. This does not cause an l quality problem. Increased freqi of impact at these levels ~7as no shown in 1979 or 1981. % Values 50 Exceeding 40 30 IO 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Peak Values PPHM I: rbUKK J - 100 - Sari Francisco Peak NO2 Peak Yalues - April 1977 - March 197f January - December 1981 - - NOTE: Data indicates a general improv in air quality for NO2- o 2 4 6 8 10 12 14 16 18 20 22 24 26 Peak Values PPHM 11 A PlhUKt LA 1 v I 100 1 I I 1 I 1 I 1 .% Va1ues I I 1 I i I 1 I I E 12 Encina Vista SO2 Peak Values 30 80 April 1977 - March 1978 = January - December 1979 70 NOTE: Dam indicates a ma;ked im9rovem in local SO2 air quality after m fication of the Encina facility. Peak values are significactly re duced. There is a slightly high frequency of levels ?be-7~ zcro t fore. However this does not rep sent an air quality problem nor it result in violation of any st ards. 60 50 Exceeding 40 30 20 io 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Peak Value P PHM m FI GI - 100 kina Vista so2 Peak Values - B J8nuat-Y - December 1: The pattern established in 1' continues. Peak values are : ficantly reduced but a slighl higher frequency of levels h~ than zero is seen. NOTE: % Values Exceed i n g 0 2 4 6 8 10 12 14 76 78 20 22 24 26 Peak Value PPHM 73 i i FIGURE ZC - I I00 1 1 I I I I 1 1 I I 1 IO 1 I 1 II kina Vista SO2 Peak Values 90 80 April 1977 - Yarch 1978 January - December 1981 i------1 - i 70 NOTE: In 1981, the trend to lowered pe values is again shown. There is intxovement in the frequency of pact which is reduced sliqhtly. 60 7; Values 5o E 40 I Exceeding 1 30 20 02 4 6 8 10 12 14 16 18 20 22 24 26 Peak Value PPHN 14 J-lbUKE 2 w Encinz Vista NO? Peak Values April J977 - March 197 January - December 197 L__ ls/ NOTE: Data continues to indicate impr in local NO2 air quality with m cation of the stack. Frequency im2act has been reduced and pea are slightly reduced - % Values Exceeding 0 2 4 6 8 70 72 14 76 T8 20 22 24 26 Peak Values PPHM 15 FIGURE 2E w Ll I 1 1 1 i i 70 1 I I X Values 1 Exceeding I 1 I 1 10 I I I 9 00 Encina Vista NO2 Peak Values 90 80 April 1977 - !larch 1978 - January - December 1980 NOTE: Daza indicates a siqnificant imp ment in local NO2 air quality. - GO 50 40 II 30 20 0 2 4 6 8 10 12 14 76 18 20 22 24 26 Peak Values PPHM 1 16 1 w FIGURE 2 100 Encina Vista NO2 Peak Values 90 80 April 1977 - !\larch 197 L=j January - December 198 70 NOTE: Data indicates a lower frequenc irpact after modification with sliqht increase in.maximun oeak values monitored. 60 % Values 50 Exceeding 40 30 20 10 0 2 4 6 8 10 12 74 16 18 20 22 24 26 Peak Values PP&I 17 w L FlLilPt 3A 1 i I I 100 Greenwood Hi 1 1 s SO2 Peak Values 90 80 I I 70 April 1977 - March 1978 rZJ January - December 1979 u--.ll-.. NOTE: Data indicates a lower frequency plume impact after modification. However a slicjhtly greater frecru 60 of levels higher than 4 pphm is corded. This increase does not present an air quality problem n will it result in a violation of aplicable air quality standard. 1 1 1 Exceeding I I 1 1 10 I 1 % Values 50 40 1 30 20 1 02 4 6 8 10 12 74 76 18 20 22 24 2 I P P HM I 18 Peak Values - FIGURE : 100 Greenwood ff i‘ 11 s SO2 Peak Values 90 80 April 1977 - March 197 1- January - December 198 70 I NOTE: Data indicates a slight incrcas frequency of impact, at a11 le\ below 12 ~phm. However the max peak levels recorded show a sli reduction. 60 % Values 50 Exceeding 40 30 20 IO 0 2 4 6 8 IO 12 14 16 78 20 22 24. 26 Peak Values PPHM 19 L.,, PlbUKt JL w 100 I I I 1 I 8 I I I % Values 1 Exceeding 1 I 1 1 1 I 1 I 20 Greenwood Hills _-- SO2 Peak Va lues 90 80 April 1977 - March 1978 Ls] January - December 1981 - 7u NOTE: Data indicates an improvement in SO2 air quality. Both frequency iro2act and maximum peak levels mc 60 are reduced. 50 40 1 30 20 IO 0 2 4 6 8 IO 12 14 16 78 20 22 24 26 Peak Values PPHN v v FIGURE 100 Greenwood Hills li02 Peak Values 90 80 April 1977 - !larch 19; /zJ JanLiary - December 19; 70 NOTE: Data indicates imnrovement in 2 quality for NO2. A lower €reg\ of impact is shown after modifj with a slight reduction in the peak level. 60 % Values 50 Exceeding 40 30 20 10 0 2 4 6 8 10 12 14 16 18 20 22 24 21 Peak Va1u.s PPHM 21 W t16UKt Jt W 100 r=3 I I 1 90 1 I I I I I m 1 B 20 I I I I i I 22 Greenwood Hi 11 s 1402 Peak Values April 1977 - March -1978 [E] January - December 1980 80 70 NOTE: In 1980, higher frequency of imp; at levels above 5 pphm is shown. There is a slight reduction in tl 60 maximum peak level. No air quality standards for NO2 were violated. I % Values 50 Exccedi ng 40 30 10 0 2 4 6 8 10 12 14 16 18 20 22 24 2 Peak Values PPHM rl TI GURC 100 Greenwood Hi 11 s NO2 Peak Values 90 “u. 80 April 1977 - March 15 B January - December 1s 70 NOTE: Improvement for NO2 air qualit shown in 1981. A lower freque 05 impact is seen again, with reduction in the maximum peak 60 % Values 50 Exceeding 40 30 20 IO 0 2 4 6 8 10 12 14 16 18 20 22 24 2 Peak Values PPHM 23